1 /*

     2  * Copyright (c) 1995, 2014, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 package java.awt;

    26 

    27 import java.io.*;

    28 import java.lang.*;

    29 import java.util.*;

    30 import java.awt.image.ImageObserver;

    31 import java.text.AttributedCharacterIterator;

    32 

    33 /**

    34  * The <code>Graphics</code> class is the abstract base class for

    35  * all graphics contexts that allow an application to draw onto

    36  * components that are realized on various devices, as well as

    37  * onto off-screen images.

    38  * <p>

    39  * A <code>Graphics</code> object encapsulates state information needed

    40  * for the basic rendering operations that Java supports.  This

    41  * state information includes the following properties:

    42  *

    43  * <ul>

    44  * <li>The <code>Component</code> object on which to draw.

    45  * <li>A translation origin for rendering and clipping coordinates.

    46  * <li>The current clip.

    47  * <li>The current color.

    48  * <li>The current font.

    49  * <li>The current logical pixel operation function (XOR or Paint).

    50  * <li>The current XOR alternation color

    51  *     (see {@link Graphics#setXORMode}).

    52  * </ul>

    53  * <p>

    54  * Coordinates are infinitely thin and lie between the pixels of the

    55  * output device.

    56  * Operations that draw the outline of a figure operate by traversing

    57  * an infinitely thin path between pixels with a pixel-sized pen that hangs

    58  * down and to the right of the anchor point on the path.

    59  * Operations that fill a figure operate by filling the interior

    60  * of that infinitely thin path.

    61  * Operations that render horizontal text render the ascending

    62  * portion of character glyphs entirely above the baseline coordinate.

    63  * <p>

    64  * The graphics pen hangs down and to the right from the path it traverses.

    65  * This has the following implications:

    66  * <ul>

    67  * <li>If you draw a figure that covers a given rectangle, that

    68  * figure occupies one extra row of pixels on the right and bottom edges

    69  * as compared to filling a figure that is bounded by that same rectangle.

    70  * <li>If you draw a horizontal line along the same <i>y</i> coordinate as

    71  * the baseline of a line of text, that line is drawn entirely below

    72  * the text, except for any descenders.

    73  * </ul><p>

    74  * All coordinates that appear as arguments to the methods of this

    75  * <code>Graphics</code> object are considered relative to the

    76  * translation origin of this <code>Graphics</code> object prior to

    77  * the invocation of the method.

    78  * <p>

    79  * All rendering operations modify only pixels which lie within the

    80  * area bounded by the current clip, which is specified by a {@link Shape}

    81  * in user space and is controlled by the program using the

    82  * <code>Graphics</code> object.  This <i>user clip</i>

    83  * is transformed into device space and combined with the

    84  * <i>device clip</i>, which is defined by the visibility of windows and

    85  * device extents.  The combination of the user clip and device clip

    86  * defines the <i>composite clip</i>, which determines the final clipping

    87  * region.  The user clip cannot be modified by the rendering

    88  * system to reflect the resulting composite clip. The user clip can only

    89  * be changed through the <code>setClip</code> or <code>clipRect</code>

    90  * methods.

    91  * All drawing or writing is done in the current color,

    92  * using the current paint mode, and in the current font.

    93  *

    94  * @author      Sami Shaio

    95  * @author      Arthur van Hoff

    96  * @see     java.awt.Component

    97  * @see     java.awt.Graphics#clipRect(int, int, int, int)

    98  * @see     java.awt.Graphics#setColor(java.awt.Color)

    99  * @see     java.awt.Graphics#setPaintMode()

   100  * @see     java.awt.Graphics#setXORMode(java.awt.Color)

   101  * @see     java.awt.Graphics#setFont(java.awt.Font)

   102  * @since       1.0

   103  */

   104 public abstract class Graphics {

   105 

   106     /**

   107      * Constructs a new <code>Graphics</code> object.

   108      * This constructor is the default constructor for a graphics

   109      * context.

   110      * <p>

   111      * Since <code>Graphics</code> is an abstract class, applications

   112      * cannot call this constructor directly. Graphics contexts are

   113      * obtained from other graphics contexts or are created by calling

   114      * <code>getGraphics</code> on a component.

   115      * @see        java.awt.Graphics#create()

   116      * @see        java.awt.Component#getGraphics

   117      */

   118     protected Graphics() {

   119     }

   120 

   121     /**

   122      * Creates a new <code>Graphics</code> object that is

   123      * a copy of this <code>Graphics</code> object.

   124      * @return     a new graphics context that is a copy of

   125      *                       this graphics context.

   126      */

   127     public abstract Graphics create();

   128 

   129     /**

   130      * Creates a new <code>Graphics</code> object based on this

   131      * <code>Graphics</code> object, but with a new translation and clip area.

   132      * The new <code>Graphics</code> object has its origin

   133      * translated to the specified point (<i>x</i>,&nbsp;<i>y</i>).

   134      * Its clip area is determined by the intersection of the original

   135      * clip area with the specified rectangle.  The arguments are all

   136      * interpreted in the coordinate system of the original

   137      * <code>Graphics</code> object. The new graphics context is

   138      * identical to the original, except in two respects:

   139      *

   140      * <ul>

   141      * <li>

   142      * The new graphics context is translated by (<i>x</i>,&nbsp;<i>y</i>).

   143      * That is to say, the point (<code>0</code>,&nbsp;<code>0</code>) in the

   144      * new graphics context is the same as (<i>x</i>,&nbsp;<i>y</i>) in

   145      * the original graphics context.

   146      * <li>

   147      * The new graphics context has an additional clipping rectangle, in

   148      * addition to whatever (translated) clipping rectangle it inherited

   149      * from the original graphics context. The origin of the new clipping

   150      * rectangle is at (<code>0</code>,&nbsp;<code>0</code>), and its size

   151      * is specified by the <code>width</code> and <code>height</code>

   152      * arguments.

   153      * </ul>

   154      *

   155      * @param      x   the <i>x</i> coordinate.

   156      * @param      y   the <i>y</i> coordinate.

   157      * @param      width   the width of the clipping rectangle.

   158      * @param      height   the height of the clipping rectangle.

   159      * @return     a new graphics context.

   160      * @see        java.awt.Graphics#translate

   161      * @see        java.awt.Graphics#clipRect

   162      */

   163     public Graphics create(int x, int y, int width, int height) {

   164         Graphics g = create();

   165         if (g == null) return null;

   166         g.translate(x, y);

   167         g.clipRect(0, 0, width, height);

   168         return g;

   169     }

   170 

   171     /**

   172      * Translates the origin of the graphics context to the point

   173      * (<i>x</i>,&nbsp;<i>y</i>) in the current coordinate system.

   174      * Modifies this graphics context so that its new origin corresponds

   175      * to the point (<i>x</i>,&nbsp;<i>y</i>) in this graphics context's

   176      * original coordinate system.  All coordinates used in subsequent

   177      * rendering operations on this graphics context will be relative

   178      * to this new origin.

   179      * @param  x   the <i>x</i> coordinate.

   180      * @param  y   the <i>y</i> coordinate.

   181      */

   182     public abstract void translate(int x, int y);

   183 

   184     /**

   185      * Gets this graphics context's current color.

   186      * @return    this graphics context's current color.

   187      * @see       java.awt.Color

   188      * @see       java.awt.Graphics#setColor(Color)

   189      */

   190     public abstract Color getColor();

   191 

   192     /**

   193      * Sets this graphics context's current color to the specified

   194      * color. All subsequent graphics operations using this graphics

   195      * context use this specified color.

   196      * @param     c   the new rendering color.

   197      * @see       java.awt.Color

   198      * @see       java.awt.Graphics#getColor

   199      */

   200     public abstract void setColor(Color c);

   201 

   202     /**

   203      * Sets the paint mode of this graphics context to overwrite the

   204      * destination with this graphics context's current color.

   205      * This sets the logical pixel operation function to the paint or

   206      * overwrite mode.  All subsequent rendering operations will

   207      * overwrite the destination with the current color.

   208      */

   209     public abstract void setPaintMode();

   210 

   211     /**

   212      * Sets the paint mode of this graphics context to alternate between

   213      * this graphics context's current color and the new specified color.

   214      * This specifies that logical pixel operations are performed in the

   215      * XOR mode, which alternates pixels between the current color and

   216      * a specified XOR color.

   217      * <p>

   218      * When drawing operations are performed, pixels which are the

   219      * current color are changed to the specified color, and vice versa.

   220      * <p>

   221      * Pixels that are of colors other than those two colors are changed

   222      * in an unpredictable but reversible manner; if the same figure is

   223      * drawn twice, then all pixels are restored to their original values.

   224      * @param     c1 the XOR alternation color

   225      */

   226     public abstract void setXORMode(Color c1);

   227 

   228     /**

   229      * Gets the current font.

   230      * @return    this graphics context's current font.

   231      * @see       java.awt.Font

   232      * @see       java.awt.Graphics#setFont(Font)

   233      */

   234     public abstract Font getFont();

   235 

   236     /**

   237      * Sets this graphics context's font to the specified font.

   238      * All subsequent text operations using this graphics context

   239      * use this font. A null argument is silently ignored.

   240      * @param  font   the font.

   241      * @see     java.awt.Graphics#getFont

   242      * @see     java.awt.Graphics#drawString(java.lang.String, int, int)

   243      * @see     java.awt.Graphics#drawBytes(byte[], int, int, int, int)

   244      * @see     java.awt.Graphics#drawChars(char[], int, int, int, int)

   245     */

   246     public abstract void setFont(Font font);

   247 

   248     /**

   249      * Gets the font metrics of the current font.

   250      * @return    the font metrics of this graphics

   251      *                    context's current font.

   252      * @see       java.awt.Graphics#getFont

   253      * @see       java.awt.FontMetrics

   254      * @see       java.awt.Graphics#getFontMetrics(Font)

   255      */

   256     public FontMetrics getFontMetrics() {

   257         return getFontMetrics(getFont());

   258     }

   259 

   260     /**

   261      * Gets the font metrics for the specified font.

   262      * @return    the font metrics for the specified font.

   263      * @param     f the specified font

   264      * @see       java.awt.Graphics#getFont

   265      * @see       java.awt.FontMetrics

   266      * @see       java.awt.Graphics#getFontMetrics()

   267      */

   268     public abstract FontMetrics getFontMetrics(Font f);

   269 

   270 

   271     /**

   272      * Returns the bounding rectangle of the current clipping area.

   273      * This method refers to the user clip, which is independent of the

   274      * clipping associated with device bounds and window visibility.

   275      * If no clip has previously been set, or if the clip has been

   276      * cleared using <code>setClip(null)</code>, this method returns

   277      * <code>null</code>.

   278      * The coordinates in the rectangle are relative to the coordinate

   279      * system origin of this graphics context.

   280      * @return      the bounding rectangle of the current clipping area,

   281      *              or <code>null</code> if no clip is set.

   282      * @see         java.awt.Graphics#getClip

   283      * @see         java.awt.Graphics#clipRect

   284      * @see         java.awt.Graphics#setClip(int, int, int, int)

   285      * @see         java.awt.Graphics#setClip(Shape)

   286      * @since       1.1

   287      */

   288     public abstract Rectangle getClipBounds();

   289 

   290     /**

   291      * Intersects the current clip with the specified rectangle.

   292      * The resulting clipping area is the intersection of the current

   293      * clipping area and the specified rectangle.  If there is no

   294      * current clipping area, either because the clip has never been

   295      * set, or the clip has been cleared using <code>setClip(null)</code>,

   296      * the specified rectangle becomes the new clip.

   297      * This method sets the user clip, which is independent of the

   298      * clipping associated with device bounds and window visibility.

   299      * This method can only be used to make the current clip smaller.

   300      * To set the current clip larger, use any of the setClip methods.

   301      * Rendering operations have no effect outside of the clipping area.

   302      * @param x the x coordinate of the rectangle to intersect the clip with

   303      * @param y the y coordinate of the rectangle to intersect the clip with

   304      * @param width the width of the rectangle to intersect the clip with

   305      * @param height the height of the rectangle to intersect the clip with

   306      * @see #setClip(int, int, int, int)

   307      * @see #setClip(Shape)

   308      */

   309     public abstract void clipRect(int x, int y, int width, int height);

   310 

   311     /**

   312      * Sets the current clip to the rectangle specified by the given

   313      * coordinates.  This method sets the user clip, which is

   314      * independent of the clipping associated with device bounds

   315      * and window visibility.

   316      * Rendering operations have no effect outside of the clipping area.

   317      * @param       x the <i>x</i> coordinate of the new clip rectangle.

   318      * @param       y the <i>y</i> coordinate of the new clip rectangle.

   319      * @param       width the width of the new clip rectangle.

   320      * @param       height the height of the new clip rectangle.

   321      * @see         java.awt.Graphics#clipRect

   322      * @see         java.awt.Graphics#setClip(Shape)

   323      * @see         java.awt.Graphics#getClip

   324      * @since       1.1

   325      */

   326     public abstract void setClip(int x, int y, int width, int height);

   327 

   328     /**

   329      * Gets the current clipping area.

   330      * This method returns the user clip, which is independent of the

   331      * clipping associated with device bounds and window visibility.

   332      * If no clip has previously been set, or if the clip has been

   333      * cleared using <code>setClip(null)</code>, this method returns

   334      * <code>null</code>.

   335      * @return      a <code>Shape</code> object representing the

   336      *              current clipping area, or <code>null</code> if

   337      *              no clip is set.

   338      * @see         java.awt.Graphics#getClipBounds

   339      * @see         java.awt.Graphics#clipRect

   340      * @see         java.awt.Graphics#setClip(int, int, int, int)

   341      * @see         java.awt.Graphics#setClip(Shape)

   342      * @since       1.1

   343      */

   344     public abstract Shape getClip();

   345 

   346     /**

   347      * Sets the current clipping area to an arbitrary clip shape.

   348      * Not all objects that implement the <code>Shape</code>

   349      * interface can be used to set the clip.  The only

   350      * <code>Shape</code> objects that are guaranteed to be

   351      * supported are <code>Shape</code> objects that are

   352      * obtained via the <code>getClip</code> method and via

   353      * <code>Rectangle</code> objects.  This method sets the

   354      * user clip, which is independent of the clipping associated

   355      * with device bounds and window visibility.

   356      * @param clip the <code>Shape</code> to use to set the clip

   357      * @see         java.awt.Graphics#getClip()

   358      * @see         java.awt.Graphics#clipRect

   359      * @see         java.awt.Graphics#setClip(int, int, int, int)

   360      * @since       1.1

   361      */

   362     public abstract void setClip(Shape clip);

   363 

   364     /**

   365      * Copies an area of the component by a distance specified by

   366      * <code>dx</code> and <code>dy</code>. From the point specified

   367      * by <code>x</code> and <code>y</code>, this method

   368      * copies downwards and to the right.  To copy an area of the

   369      * component to the left or upwards, specify a negative value for

   370      * <code>dx</code> or <code>dy</code>.

   371      * If a portion of the source rectangle lies outside the bounds

   372      * of the component, or is obscured by another window or component,

   373      * <code>copyArea</code> will be unable to copy the associated

   374      * pixels. The area that is omitted can be refreshed by calling

   375      * the component's <code>paint</code> method.

   376      * @param       x the <i>x</i> coordinate of the source rectangle.

   377      * @param       y the <i>y</i> coordinate of the source rectangle.

   378      * @param       width the width of the source rectangle.

   379      * @param       height the height of the source rectangle.

   380      * @param       dx the horizontal distance to copy the pixels.

   381      * @param       dy the vertical distance to copy the pixels.

   382      */

   383     public abstract void copyArea(int x, int y, int width, int height,

   384                                   int dx, int dy);

   385 

   386     /**

   387      * Draws a line, using the current color, between the points

   388      * <code>(x1,&nbsp;y1)</code> and <code>(x2,&nbsp;y2)</code>

   389      * in this graphics context's coordinate system.

   390      * @param   x1  the first point's <i>x</i> coordinate.

   391      * @param   y1  the first point's <i>y</i> coordinate.

   392      * @param   x2  the second point's <i>x</i> coordinate.

   393      * @param   y2  the second point's <i>y</i> coordinate.

   394      */

   395     public abstract void drawLine(int x1, int y1, int x2, int y2);

   396 

   397     /**

   398      * Fills the specified rectangle.

   399      * The left and right edges of the rectangle are at

   400      * <code>x</code> and <code>x&nbsp;+&nbsp;width&nbsp;-&nbsp;1</code>.

   401      * The top and bottom edges are at

   402      * <code>y</code> and <code>y&nbsp;+&nbsp;height&nbsp;-&nbsp;1</code>.

   403      * The resulting rectangle covers an area

   404      * <code>width</code> pixels wide by

   405      * <code>height</code> pixels tall.

   406      * The rectangle is filled using the graphics context's current color.

   407      * @param         x   the <i>x</i> coordinate

   408      *                         of the rectangle to be filled.

   409      * @param         y   the <i>y</i> coordinate

   410      *                         of the rectangle to be filled.

   411      * @param         width   the width of the rectangle to be filled.

   412      * @param         height   the height of the rectangle to be filled.

   413      * @see           java.awt.Graphics#clearRect

   414      * @see           java.awt.Graphics#drawRect

   415      */

   416     public abstract void fillRect(int x, int y, int width, int height);

   417 

   418     /**

   419      * Draws the outline of the specified rectangle.

   420      * The left and right edges of the rectangle are at

   421      * <code>x</code> and <code>x&nbsp;+&nbsp;width</code>.

   422      * The top and bottom edges are at

   423      * <code>y</code> and <code>y&nbsp;+&nbsp;height</code>.

   424      * The rectangle is drawn using the graphics context's current color.

   425      * @param         x   the <i>x</i> coordinate

   426      *                         of the rectangle to be drawn.

   427      * @param         y   the <i>y</i> coordinate

   428      *                         of the rectangle to be drawn.

   429      * @param         width   the width of the rectangle to be drawn.

   430      * @param         height   the height of the rectangle to be drawn.

   431      * @see          java.awt.Graphics#fillRect

   432      * @see          java.awt.Graphics#clearRect

   433      */

   434     public void drawRect(int x, int y, int width, int height) {

   435         if ((width < 0) || (height < 0)) {

   436             return;

   437         }

   438 

   439         if (height == 0 || width == 0) {

   440             drawLine(x, y, x + width, y + height);

   441         } else {

   442             drawLine(x, y, x + width - 1, y);

   443             drawLine(x + width, y, x + width, y + height - 1);

   444             drawLine(x + width, y + height, x + 1, y + height);

   445             drawLine(x, y + height, x, y + 1);

   446         }

   447     }

   448 

   449     /**

   450      * Clears the specified rectangle by filling it with the background

   451      * color of the current drawing surface. This operation does not

   452      * use the current paint mode.

   453      * <p>

   454      * Beginning with Java 1.1, the background color

   455      * of offscreen images may be system dependent. Applications should

   456      * use <code>setColor</code> followed by <code>fillRect</code> to

   457      * ensure that an offscreen image is cleared to a specific color.

   458      * @param       x the <i>x</i> coordinate of the rectangle to clear.

   459      * @param       y the <i>y</i> coordinate of the rectangle to clear.

   460      * @param       width the width of the rectangle to clear.

   461      * @param       height the height of the rectangle to clear.

   462      * @see         java.awt.Graphics#fillRect(int, int, int, int)

   463      * @see         java.awt.Graphics#drawRect

   464      * @see         java.awt.Graphics#setColor(java.awt.Color)

   465      * @see         java.awt.Graphics#setPaintMode

   466      * @see         java.awt.Graphics#setXORMode(java.awt.Color)

   467      */

   468     public abstract void clearRect(int x, int y, int width, int height);

   469 

   470     /**

   471      * Draws an outlined round-cornered rectangle using this graphics

   472      * context's current color. The left and right edges of the rectangle

   473      * are at <code>x</code> and <code>x&nbsp;+&nbsp;width</code>,

   474      * respectively. The top and bottom edges of the rectangle are at

   475      * <code>y</code> and <code>y&nbsp;+&nbsp;height</code>.

   476      * @param      x the <i>x</i> coordinate of the rectangle to be drawn.

   477      * @param      y the <i>y</i> coordinate of the rectangle to be drawn.

   478      * @param      width the width of the rectangle to be drawn.

   479      * @param      height the height of the rectangle to be drawn.

   480      * @param      arcWidth the horizontal diameter of the arc

   481      *                    at the four corners.

   482      * @param      arcHeight the vertical diameter of the arc

   483      *                    at the four corners.

   484      * @see        java.awt.Graphics#fillRoundRect

   485      */

   486     public abstract void drawRoundRect(int x, int y, int width, int height,

   487                                        int arcWidth, int arcHeight);

   488 

   489     /**

   490      * Fills the specified rounded corner rectangle with the current color.

   491      * The left and right edges of the rectangle

   492      * are at <code>x</code> and <code>x&nbsp;+&nbsp;width&nbsp;-&nbsp;1</code>,

   493      * respectively. The top and bottom edges of the rectangle are at

   494      * <code>y</code> and <code>y&nbsp;+&nbsp;height&nbsp;-&nbsp;1</code>.

   495      * @param       x the <i>x</i> coordinate of the rectangle to be filled.

   496      * @param       y the <i>y</i> coordinate of the rectangle to be filled.

   497      * @param       width the width of the rectangle to be filled.

   498      * @param       height the height of the rectangle to be filled.

   499      * @param       arcWidth the horizontal diameter

   500      *                     of the arc at the four corners.

   501      * @param       arcHeight the vertical diameter

   502      *                     of the arc at the four corners.

   503      * @see         java.awt.Graphics#drawRoundRect

   504      */

   505     public abstract void fillRoundRect(int x, int y, int width, int height,

   506                                        int arcWidth, int arcHeight);

   507 

   508     /**

   509      * Draws a 3-D highlighted outline of the specified rectangle.

   510      * The edges of the rectangle are highlighted so that they

   511      * appear to be beveled and lit from the upper left corner.

   512      * <p>

   513      * The colors used for the highlighting effect are determined

   514      * based on the current color.

   515      * The resulting rectangle covers an area that is

   516      * <code>width&nbsp;+&nbsp;1</code> pixels wide

   517      * by <code>height&nbsp;+&nbsp;1</code> pixels tall.

   518      * @param       x the <i>x</i> coordinate of the rectangle to be drawn.

   519      * @param       y the <i>y</i> coordinate of the rectangle to be drawn.

   520      * @param       width the width of the rectangle to be drawn.

   521      * @param       height the height of the rectangle to be drawn.

   522      * @param       raised a boolean that determines whether the rectangle

   523      *                      appears to be raised above the surface

   524      *                      or sunk into the surface.

   525      * @see         java.awt.Graphics#fill3DRect

   526      */

   527     public void draw3DRect(int x, int y, int width, int height,

   528                            boolean raised) {

   529         Color c = getColor();

   530         Color brighter = c.brighter();

   531         Color darker = c.darker();

   532 

   533         setColor(raised ? brighter : darker);

   534         drawLine(x, y, x, y + height);

   535         drawLine(x + 1, y, x + width - 1, y);

   536         setColor(raised ? darker : brighter);

   537         drawLine(x + 1, y + height, x + width, y + height);

   538         drawLine(x + width, y, x + width, y + height - 1);

   539         setColor(c);

   540     }

   541 

   542     /**

   543      * Paints a 3-D highlighted rectangle filled with the current color.

   544      * The edges of the rectangle will be highlighted so that it appears

   545      * as if the edges were beveled and lit from the upper left corner.

   546      * The colors used for the highlighting effect will be determined from

   547      * the current color.

   548      * @param       x the <i>x</i> coordinate of the rectangle to be filled.

   549      * @param       y the <i>y</i> coordinate of the rectangle to be filled.

   550      * @param       width the width of the rectangle to be filled.

   551      * @param       height the height of the rectangle to be filled.

   552      * @param       raised a boolean value that determines whether the

   553      *                      rectangle appears to be raised above the surface

   554      *                      or etched into the surface.

   555      * @see         java.awt.Graphics#draw3DRect

   556      */

   557     public void fill3DRect(int x, int y, int width, int height,

   558                            boolean raised) {

   559         Color c = getColor();

   560         Color brighter = c.brighter();

   561         Color darker = c.darker();

   562 

   563         if (!raised) {

   564             setColor(darker);

   565         }

   566         fillRect(x+1, y+1, width-2, height-2);

   567         setColor(raised ? brighter : darker);

   568         drawLine(x, y, x, y + height - 1);

   569         drawLine(x + 1, y, x + width - 2, y);

   570         setColor(raised ? darker : brighter);

   571         drawLine(x + 1, y + height - 1, x + width - 1, y + height - 1);

   572         drawLine(x + width - 1, y, x + width - 1, y + height - 2);

   573         setColor(c);

   574     }

   575 

   576     /**

   577      * Draws the outline of an oval.

   578      * The result is a circle or ellipse that fits within the

   579      * rectangle specified by the <code>x</code>, <code>y</code>,

   580      * <code>width</code>, and <code>height</code> arguments.

   581      * <p>

   582      * The oval covers an area that is

   583      * <code>width&nbsp;+&nbsp;1</code> pixels wide

   584      * and <code>height&nbsp;+&nbsp;1</code> pixels tall.

   585      * @param       x the <i>x</i> coordinate of the upper left

   586      *                     corner of the oval to be drawn.

   587      * @param       y the <i>y</i> coordinate of the upper left

   588      *                     corner of the oval to be drawn.

   589      * @param       width the width of the oval to be drawn.

   590      * @param       height the height of the oval to be drawn.

   591      * @see         java.awt.Graphics#fillOval

   592      */

   593     public abstract void drawOval(int x, int y, int width, int height);

   594 

   595     /**

   596      * Fills an oval bounded by the specified rectangle with the

   597      * current color.

   598      * @param       x the <i>x</i> coordinate of the upper left corner

   599      *                     of the oval to be filled.

   600      * @param       y the <i>y</i> coordinate of the upper left corner

   601      *                     of the oval to be filled.

   602      * @param       width the width of the oval to be filled.

   603      * @param       height the height of the oval to be filled.

   604      * @see         java.awt.Graphics#drawOval

   605      */

   606     public abstract void fillOval(int x, int y, int width, int height);

   607 

   608     /**

   609      * Draws the outline of a circular or elliptical arc

   610      * covering the specified rectangle.

   611      * <p>

   612      * The resulting arc begins at <code>startAngle</code> and extends

   613      * for <code>arcAngle</code> degrees, using the current color.

   614      * Angles are interpreted such that 0 degrees

   615      * is at the 3 o'clock position.

   616      * A positive value indicates a counter-clockwise rotation

   617      * while a negative value indicates a clockwise rotation.

   618      * <p>

   619      * The center of the arc is the center of the rectangle whose origin

   620      * is (<i>x</i>,&nbsp;<i>y</i>) and whose size is specified by the

   621      * <code>width</code> and <code>height</code> arguments.

   622      * <p>

   623      * The resulting arc covers an area

   624      * <code>width&nbsp;+&nbsp;1</code> pixels wide

   625      * by <code>height&nbsp;+&nbsp;1</code> pixels tall.

   626      * <p>

   627      * The angles are specified relative to the non-square extents of

   628      * the bounding rectangle such that 45 degrees always falls on the

   629      * line from the center of the ellipse to the upper right corner of

   630      * the bounding rectangle. As a result, if the bounding rectangle is

   631      * noticeably longer in one axis than the other, the angles to the

   632      * start and end of the arc segment will be skewed farther along the

   633      * longer axis of the bounds.

   634      * @param        x the <i>x</i> coordinate of the

   635      *                    upper-left corner of the arc to be drawn.

   636      * @param        y the <i>y</i>  coordinate of the

   637      *                    upper-left corner of the arc to be drawn.

   638      * @param        width the width of the arc to be drawn.

   639      * @param        height the height of the arc to be drawn.

   640      * @param        startAngle the beginning angle.

   641      * @param        arcAngle the angular extent of the arc,

   642      *                    relative to the start angle.

   643      * @see         java.awt.Graphics#fillArc

   644      */

   645     public abstract void drawArc(int x, int y, int width, int height,

   646                                  int startAngle, int arcAngle);

   647 

   648     /**

   649      * Fills a circular or elliptical arc covering the specified rectangle.

   650      * <p>

   651      * The resulting arc begins at <code>startAngle</code> and extends

   652      * for <code>arcAngle</code> degrees.

   653      * Angles are interpreted such that 0 degrees

   654      * is at the 3 o'clock position.

   655      * A positive value indicates a counter-clockwise rotation

   656      * while a negative value indicates a clockwise rotation.

   657      * <p>

   658      * The center of the arc is the center of the rectangle whose origin

   659      * is (<i>x</i>,&nbsp;<i>y</i>) and whose size is specified by the

   660      * <code>width</code> and <code>height</code> arguments.

   661      * <p>

   662      * The resulting arc covers an area

   663      * <code>width&nbsp;+&nbsp;1</code> pixels wide

   664      * by <code>height&nbsp;+&nbsp;1</code> pixels tall.

   665      * <p>

   666      * The angles are specified relative to the non-square extents of

   667      * the bounding rectangle such that 45 degrees always falls on the

   668      * line from the center of the ellipse to the upper right corner of

   669      * the bounding rectangle. As a result, if the bounding rectangle is

   670      * noticeably longer in one axis than the other, the angles to the

   671      * start and end of the arc segment will be skewed farther along the

   672      * longer axis of the bounds.

   673      * @param        x the <i>x</i> coordinate of the

   674      *                    upper-left corner of the arc to be filled.

   675      * @param        y the <i>y</i>  coordinate of the

   676      *                    upper-left corner of the arc to be filled.

   677      * @param        width the width of the arc to be filled.

   678      * @param        height the height of the arc to be filled.

   679      * @param        startAngle the beginning angle.

   680      * @param        arcAngle the angular extent of the arc,

   681      *                    relative to the start angle.

   682      * @see         java.awt.Graphics#drawArc

   683      */

   684     public abstract void fillArc(int x, int y, int width, int height,

   685                                  int startAngle, int arcAngle);

   686 

   687     /**

   688      * Draws a sequence of connected lines defined by

   689      * arrays of <i>x</i> and <i>y</i> coordinates.

   690      * Each pair of (<i>x</i>,&nbsp;<i>y</i>) coordinates defines a point.

   691      * The figure is not closed if the first point

   692      * differs from the last point.

   693      * @param       xPoints an array of <i>x</i> points

   694      * @param       yPoints an array of <i>y</i> points

   695      * @param       nPoints the total number of points

   696      * @see         java.awt.Graphics#drawPolygon(int[], int[], int)

   697      * @since       1.1

   698      */

   699     public abstract void drawPolyline(int xPoints[], int yPoints[],

   700                                       int nPoints);

   701 

   702     /**

   703      * Draws a closed polygon defined by

   704      * arrays of <i>x</i> and <i>y</i> coordinates.

   705      * Each pair of (<i>x</i>,&nbsp;<i>y</i>) coordinates defines a point.

   706      * <p>

   707      * This method draws the polygon defined by <code>nPoint</code> line

   708      * segments, where the first <code>nPoint&nbsp;-&nbsp;1</code>

   709      * line segments are line segments from

   710      * <code>(xPoints[i&nbsp;-&nbsp;1],&nbsp;yPoints[i&nbsp;-&nbsp;1])</code>

   711      * to <code>(xPoints[i],&nbsp;yPoints[i])</code>, for

   712      * 1&nbsp;&le;&nbsp;<i>i</i>&nbsp;&le;&nbsp;<code>nPoints</code>.

   713      * The figure is automatically closed by drawing a line connecting

   714      * the final point to the first point, if those points are different.

   715      * @param        xPoints   a an array of <code>x</code> coordinates.

   716      * @param        yPoints   a an array of <code>y</code> coordinates.

   717      * @param        nPoints   a the total number of points.

   718      * @see          java.awt.Graphics#fillPolygon

   719      * @see          java.awt.Graphics#drawPolyline

   720      */

   721     public abstract void drawPolygon(int xPoints[], int yPoints[],

   722                                      int nPoints);

   723 

   724     /**

   725      * Draws the outline of a polygon defined by the specified

   726      * <code>Polygon</code> object.

   727      * @param        p the polygon to draw.

   728      * @see          java.awt.Graphics#fillPolygon

   729      * @see          java.awt.Graphics#drawPolyline

   730      */

   731     public void drawPolygon(Polygon p) {

   732         drawPolygon(p.xpoints, p.ypoints, p.npoints);

   733     }

   734 

   735     /**

   736      * Fills a closed polygon defined by

   737      * arrays of <i>x</i> and <i>y</i> coordinates.

   738      * <p>

   739      * This method draws the polygon defined by <code>nPoint</code> line

   740      * segments, where the first <code>nPoint&nbsp;-&nbsp;1</code>

   741      * line segments are line segments from

   742      * <code>(xPoints[i&nbsp;-&nbsp;1],&nbsp;yPoints[i&nbsp;-&nbsp;1])</code>

   743      * to <code>(xPoints[i],&nbsp;yPoints[i])</code>, for

   744      * 1&nbsp;&le;&nbsp;<i>i</i>&nbsp;&le;&nbsp;<code>nPoints</code>.

   745      * The figure is automatically closed by drawing a line connecting

   746      * the final point to the first point, if those points are different.

   747      * <p>

   748      * The area inside the polygon is defined using an

   749      * even-odd fill rule, also known as the alternating rule.

   750      * @param        xPoints   a an array of <code>x</code> coordinates.

   751      * @param        yPoints   a an array of <code>y</code> coordinates.

   752      * @param        nPoints   a the total number of points.

   753      * @see          java.awt.Graphics#drawPolygon(int[], int[], int)

   754      */

   755     public abstract void fillPolygon(int xPoints[], int yPoints[],

   756                                      int nPoints);

   757 

   758     /**

   759      * Fills the polygon defined by the specified Polygon object with

   760      * the graphics context's current color.

   761      * <p>

   762      * The area inside the polygon is defined using an

   763      * even-odd fill rule, also known as the alternating rule.

   764      * @param        p the polygon to fill.

   765      * @see          java.awt.Graphics#drawPolygon(int[], int[], int)

   766      */

   767     public void fillPolygon(Polygon p) {

   768         fillPolygon(p.xpoints, p.ypoints, p.npoints);

   769     }

   770 

   771     /**

   772      * Draws the text given by the specified string, using this

   773      * graphics context's current font and color. The baseline of the

   774      * leftmost character is at position (<i>x</i>,&nbsp;<i>y</i>) in this

   775      * graphics context's coordinate system.

   776      * @param       str      the string to be drawn.

   777      * @param       x        the <i>x</i> coordinate.

   778      * @param       y        the <i>y</i> coordinate.

   779      * @throws NullPointerException if <code>str</code> is <code>null</code>.

   780      * @see         java.awt.Graphics#drawBytes

   781      * @see         java.awt.Graphics#drawChars

   782      */

   783     public abstract void drawString(String str, int x, int y);

   784 

   785     /**

   786      * Renders the text of the specified iterator applying its attributes

   787      * in accordance with the specification of the

   788      * {@link java.awt.font.TextAttribute TextAttribute} class.

   789      * <p>

   790      * The baseline of the leftmost character is at position

   791      * (<i>x</i>,&nbsp;<i>y</i>) in this graphics context's coordinate system.

   792      * @param       iterator the iterator whose text is to be drawn

   793      * @param       x        the <i>x</i> coordinate.

   794      * @param       y        the <i>y</i> coordinate.

   795      * @throws NullPointerException if <code>iterator</code> is

   796      * <code>null</code>.

   797      * @see         java.awt.Graphics#drawBytes

   798      * @see         java.awt.Graphics#drawChars

   799      */

   800    public abstract void drawString(AttributedCharacterIterator iterator,

   801                                     int x, int y);

   802 

   803     /**

   804      * Draws the text given by the specified character array, using this

   805      * graphics context's current font and color. The baseline of the

   806      * first character is at position (<i>x</i>,&nbsp;<i>y</i>) in this

   807      * graphics context's coordinate system.

   808      * @param data the array of characters to be drawn

   809      * @param offset the start offset in the data

   810      * @param length the number of characters to be drawn

   811      * @param x the <i>x</i> coordinate of the baseline of the text

   812      * @param y the <i>y</i> coordinate of the baseline of the text

   813      * @throws NullPointerException if <code>data</code> is <code>null</code>.

   814      * @throws IndexOutOfBoundsException if <code>offset</code> or

   815      * <code>length</code>is less than zero, or

   816      * <code>offset+length</code> is greater than the length of the

   817      * <code>data</code> array.

   818      * @see         java.awt.Graphics#drawBytes

   819      * @see         java.awt.Graphics#drawString

   820      */

   821     public void drawChars(char data[], int offset, int length, int x, int y) {

   822         drawString(new String(data, offset, length), x, y);

   823     }

   824 

   825     /**

   826      * Draws the text given by the specified byte array, using this

   827      * graphics context's current font and color. The baseline of the

   828      * first character is at position (<i>x</i>,&nbsp;<i>y</i>) in this

   829      * graphics context's coordinate system.

   830      * <p>

   831      * Use of this method is not recommended as each byte is interpreted

   832      * as a Unicode code point in the range 0 to 255, and so can only be

   833      * used to draw Latin characters in that range.

   834      * @param data the data to be drawn

   835      * @param offset the start offset in the data

   836      * @param length the number of bytes that are drawn

   837      * @param x the <i>x</i> coordinate of the baseline of the text

   838      * @param y the <i>y</i> coordinate of the baseline of the text

   839      * @throws NullPointerException if <code>data</code> is <code>null</code>.

   840      * @throws IndexOutOfBoundsException if <code>offset</code> or

   841      * <code>length</code>is less than zero, or <code>offset+length</code>

   842      * is greater than the length of the <code>data</code> array.

   843      * @see         java.awt.Graphics#drawChars

   844      * @see         java.awt.Graphics#drawString

   845      */

   846     public void drawBytes(byte data[], int offset, int length, int x, int y) {

   847         drawString(new String(data, 0, offset, length), x, y);

   848     }

   849 

   850     /**

   851      * Draws as much of the specified image as is currently available.

   852      * The image is drawn with its top-left corner at

   853      * (<i>x</i>,&nbsp;<i>y</i>) in this graphics context's coordinate

   854      * space. Transparent pixels in the image do not affect whatever

   855      * pixels are already there.

   856      * <p>

   857      * This method returns immediately in all cases, even if the

   858      * complete image has not yet been loaded, and it has not been dithered

   859      * and converted for the current output device.

   860      * <p>

   861      * If the image has completely loaded and its pixels are

   862      * no longer being changed, then

   863      * <code>drawImage</code> returns <code>true</code>.

   864      * Otherwise, <code>drawImage</code> returns <code>false</code>

   865      * and as more of

   866      * the image becomes available

   867      * or it is time to draw another frame of animation,

   868      * the process that loads the image notifies

   869      * the specified image observer.

   870      * @param    img the specified image to be drawn. This method does

   871      *               nothing if <code>img</code> is null.

   872      * @param    x   the <i>x</i> coordinate.

   873      * @param    y   the <i>y</i> coordinate.

   874      * @param    observer    object to be notified as more of

   875      *                          the image is converted.

   876      * @return   <code>false</code> if the image pixels are still changing;

   877      *           <code>true</code> otherwise.

   878      * @see      java.awt.Image

   879      * @see      java.awt.image.ImageObserver

   880      * @see      java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)

   881      */

   882     public abstract boolean drawImage(Image img, int x, int y,

   883                                       ImageObserver observer);

   884 

   885     /**

   886      * Draws as much of the specified image as has already been scaled

   887      * to fit inside the specified rectangle.

   888      * <p>

   889      * The image is drawn inside the specified rectangle of this

   890      * graphics context's coordinate space, and is scaled if

   891      * necessary. Transparent pixels do not affect whatever pixels

   892      * are already there.

   893      * <p>

   894      * This method returns immediately in all cases, even if the

   895      * entire image has not yet been scaled, dithered, and converted

   896      * for the current output device.

   897      * If the current output representation is not yet complete, then

   898      * <code>drawImage</code> returns <code>false</code>. As more of

   899      * the image becomes available, the process that loads the image notifies

   900      * the image observer by calling its <code>imageUpdate</code> method.

   901      * <p>

   902      * A scaled version of an image will not necessarily be

   903      * available immediately just because an unscaled version of the

   904      * image has been constructed for this output device.  Each size of

   905      * the image may be cached separately and generated from the original

   906      * data in a separate image production sequence.

   907      * @param    img    the specified image to be drawn. This method does

   908      *                  nothing if <code>img</code> is null.

   909      * @param    x      the <i>x</i> coordinate.

   910      * @param    y      the <i>y</i> coordinate.

   911      * @param    width  the width of the rectangle.

   912      * @param    height the height of the rectangle.

   913      * @param    observer    object to be notified as more of

   914      *                          the image is converted.

   915      * @return   <code>false</code> if the image pixels are still changing;

   916      *           <code>true</code> otherwise.

   917      * @see      java.awt.Image

   918      * @see      java.awt.image.ImageObserver

   919      * @see      java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)

   920      */

   921     public abstract boolean drawImage(Image img, int x, int y,

   922                                       int width, int height,

   923                                       ImageObserver observer);

   924 

   925     /**

   926      * Draws as much of the specified image as is currently available.

   927      * The image is drawn with its top-left corner at

   928      * (<i>x</i>,&nbsp;<i>y</i>) in this graphics context's coordinate

   929      * space.  Transparent pixels are drawn in the specified

   930      * background color.

   931      * <p>

   932      * This operation is equivalent to filling a rectangle of the

   933      * width and height of the specified image with the given color and then

   934      * drawing the image on top of it, but possibly more efficient.

   935      * <p>

   936      * This method returns immediately in all cases, even if the

   937      * complete image has not yet been loaded, and it has not been dithered

   938      * and converted for the current output device.

   939      * <p>

   940      * If the image has completely loaded and its pixels are

   941      * no longer being changed, then

   942      * <code>drawImage</code> returns <code>true</code>.

   943      * Otherwise, <code>drawImage</code> returns <code>false</code>

   944      * and as more of

   945      * the image becomes available

   946      * or it is time to draw another frame of animation,

   947      * the process that loads the image notifies

   948      * the specified image observer.

   949      * @param    img the specified image to be drawn. This method does

   950      *               nothing if <code>img</code> is null.

   951      * @param    x      the <i>x</i> coordinate.

   952      * @param    y      the <i>y</i> coordinate.

   953      * @param    bgcolor the background color to paint under the

   954      *                         non-opaque portions of the image.

   955      * @param    observer    object to be notified as more of

   956      *                          the image is converted.

   957      * @return   <code>false</code> if the image pixels are still changing;

   958      *           <code>true</code> otherwise.

   959      * @see      java.awt.Image

   960      * @see      java.awt.image.ImageObserver

   961      * @see      java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)

   962      */

   963     public abstract boolean drawImage(Image img, int x, int y,

   964                                       Color bgcolor,

   965                                       ImageObserver observer);

   966 

   967     /**

   968      * Draws as much of the specified image as has already been scaled

   969      * to fit inside the specified rectangle.

   970      * <p>

   971      * The image is drawn inside the specified rectangle of this

   972      * graphics context's coordinate space, and is scaled if

   973      * necessary. Transparent pixels are drawn in the specified

   974      * background color.

   975      * This operation is equivalent to filling a rectangle of the

   976      * width and height of the specified image with the given color and then

   977      * drawing the image on top of it, but possibly more efficient.

   978      * <p>

   979      * This method returns immediately in all cases, even if the

   980      * entire image has not yet been scaled, dithered, and converted

   981      * for the current output device.

   982      * If the current output representation is not yet complete then

   983      * <code>drawImage</code> returns <code>false</code>. As more of

   984      * the image becomes available, the process that loads the image notifies

   985      * the specified image observer.

   986      * <p>

   987      * A scaled version of an image will not necessarily be

   988      * available immediately just because an unscaled version of the

   989      * image has been constructed for this output device.  Each size of

   990      * the image may be cached separately and generated from the original

   991      * data in a separate image production sequence.

   992      * @param    img       the specified image to be drawn. This method does

   993      *                     nothing if <code>img</code> is null.

   994      * @param    x         the <i>x</i> coordinate.

   995      * @param    y         the <i>y</i> coordinate.

   996      * @param    width     the width of the rectangle.

   997      * @param    height    the height of the rectangle.

   998      * @param    bgcolor   the background color to paint under the

   999      *                         non-opaque portions of the image.

  1000      * @param    observer    object to be notified as more of

  1001      *                          the image is converted.

  1002      * @return   <code>false</code> if the image pixels are still changing;

  1003      *           <code>true</code> otherwise.

  1004      * @see      java.awt.Image

  1005      * @see      java.awt.image.ImageObserver

  1006      * @see      java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)

  1007      */

  1008     public abstract boolean drawImage(Image img, int x, int y,

  1009                                       int width, int height,

  1010                                       Color bgcolor,

  1011                                       ImageObserver observer);

  1012 

  1013     /**

  1014      * Draws as much of the specified area of the specified image as is

  1015      * currently available, scaling it on the fly to fit inside the

  1016      * specified area of the destination drawable surface. Transparent pixels

  1017      * do not affect whatever pixels are already there.

  1018      * <p>

  1019      * This method returns immediately in all cases, even if the

  1020      * image area to be drawn has not yet been scaled, dithered, and converted

  1021      * for the current output device.

  1022      * If the current output representation is not yet complete then

  1023      * <code>drawImage</code> returns <code>false</code>. As more of

  1024      * the image becomes available, the process that loads the image notifies

  1025      * the specified image observer.

  1026      * <p>

  1027      * This method always uses the unscaled version of the image

  1028      * to render the scaled rectangle and performs the required

  1029      * scaling on the fly. It does not use a cached, scaled version

  1030      * of the image for this operation. Scaling of the image from source

  1031      * to destination is performed such that the first coordinate

  1032      * of the source rectangle is mapped to the first coordinate of

  1033      * the destination rectangle, and the second source coordinate is

  1034      * mapped to the second destination coordinate. The subimage is

  1035      * scaled and flipped as needed to preserve those mappings.

  1036      * @param       img the specified image to be drawn. This method does

  1037      *                  nothing if <code>img</code> is null.

  1038      * @param       dx1 the <i>x</i> coordinate of the first corner of the

  1039      *                    destination rectangle.

  1040      * @param       dy1 the <i>y</i> coordinate of the first corner of the

  1041      *                    destination rectangle.

  1042      * @param       dx2 the <i>x</i> coordinate of the second corner of the

  1043      *                    destination rectangle.

  1044      * @param       dy2 the <i>y</i> coordinate of the second corner of the

  1045      *                    destination rectangle.

  1046      * @param       sx1 the <i>x</i> coordinate of the first corner of the

  1047      *                    source rectangle.

  1048      * @param       sy1 the <i>y</i> coordinate of the first corner of the

  1049      *                    source rectangle.

  1050      * @param       sx2 the <i>x</i> coordinate of the second corner of the

  1051      *                    source rectangle.

  1052      * @param       sy2 the <i>y</i> coordinate of the second corner of the

  1053      *                    source rectangle.

  1054      * @param       observer object to be notified as more of the image is

  1055      *                    scaled and converted.

  1056      * @return   <code>false</code> if the image pixels are still changing;

  1057      *           <code>true</code> otherwise.

  1058      * @see         java.awt.Image

  1059      * @see         java.awt.image.ImageObserver

  1060      * @see         java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)

  1061      * @since       1.1

  1062      */

  1063     public abstract boolean drawImage(Image img,

  1064                                       int dx1, int dy1, int dx2, int dy2,

  1065                                       int sx1, int sy1, int sx2, int sy2,

  1066                                       ImageObserver observer);

  1067 

  1068     /**

  1069      * Draws as much of the specified area of the specified image as is

  1070      * currently available, scaling it on the fly to fit inside the

  1071      * specified area of the destination drawable surface.

  1072      * <p>

  1073      * Transparent pixels are drawn in the specified background color.

  1074      * This operation is equivalent to filling a rectangle of the

  1075      * width and height of the specified image with the given color and then

  1076      * drawing the image on top of it, but possibly more efficient.

  1077      * <p>

  1078      * This method returns immediately in all cases, even if the

  1079      * image area to be drawn has not yet been scaled, dithered, and converted

  1080      * for the current output device.

  1081      * If the current output representation is not yet complete then

  1082      * <code>drawImage</code> returns <code>false</code>. As more of

  1083      * the image becomes available, the process that loads the image notifies

  1084      * the specified image observer.

  1085      * <p>

  1086      * This method always uses the unscaled version of the image

  1087      * to render the scaled rectangle and performs the required

  1088      * scaling on the fly. It does not use a cached, scaled version

  1089      * of the image for this operation. Scaling of the image from source

  1090      * to destination is performed such that the first coordinate

  1091      * of the source rectangle is mapped to the first coordinate of

  1092      * the destination rectangle, and the second source coordinate is

  1093      * mapped to the second destination coordinate. The subimage is

  1094      * scaled and flipped as needed to preserve those mappings.

  1095      * @param       img the specified image to be drawn. This method does

  1096      *                  nothing if <code>img</code> is null.

  1097      * @param       dx1 the <i>x</i> coordinate of the first corner of the

  1098      *                    destination rectangle.

  1099      * @param       dy1 the <i>y</i> coordinate of the first corner of the

  1100      *                    destination rectangle.

  1101      * @param       dx2 the <i>x</i> coordinate of the second corner of the

  1102      *                    destination rectangle.

  1103      * @param       dy2 the <i>y</i> coordinate of the second corner of the

  1104      *                    destination rectangle.

  1105      * @param       sx1 the <i>x</i> coordinate of the first corner of the

  1106      *                    source rectangle.

  1107      * @param       sy1 the <i>y</i> coordinate of the first corner of the

  1108      *                    source rectangle.

  1109      * @param       sx2 the <i>x</i> coordinate of the second corner of the

  1110      *                    source rectangle.

  1111      * @param       sy2 the <i>y</i> coordinate of the second corner of the

  1112      *                    source rectangle.

  1113      * @param       bgcolor the background color to paint under the

  1114      *                    non-opaque portions of the image.

  1115      * @param       observer object to be notified as more of the image is

  1116      *                    scaled and converted.

  1117      * @return   <code>false</code> if the image pixels are still changing;

  1118      *           <code>true</code> otherwise.

  1119      * @see         java.awt.Image

  1120      * @see         java.awt.image.ImageObserver

  1121      * @see         java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)

  1122      * @since       1.1

  1123      */

  1124     public abstract boolean drawImage(Image img,

  1125                                       int dx1, int dy1, int dx2, int dy2,

  1126                                       int sx1, int sy1, int sx2, int sy2,

  1127                                       Color bgcolor,

  1128                                       ImageObserver observer);

  1129 

  1130     /**

  1131      * Disposes of this graphics context and releases

  1132      * any system resources that it is using.

  1133      * A <code>Graphics</code> object cannot be used after

  1134      * <code>dispose</code>has been called.