1 /*

     2  * Copyright (c) 2017, 2018, 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 sun.java2d.marlin;

    26 

    27 import sun.awt.geom.PathConsumer2D;

    28 

    29 final class PathSimplifier implements PathConsumer2D {

    30 

    31     // distance threshold in pixels (device)

    32     private static final float PIX_THRESHOLD = MarlinProperties.getPathSimplifierPixelTolerance();

    33 

    34     private static final float SQUARE_TOLERANCE = PIX_THRESHOLD * PIX_THRESHOLD;

    35 

    36     // members:

    37     private PathConsumer2D delegate;

    38     private float cx, cy;

    39 

    40     PathSimplifier() {

    41     }

    42 

    43     PathSimplifier init(final PathConsumer2D delegate) {

    44         this.delegate = delegate;

    45         return this; // fluent API

    46     }

    47 

    48     @Override

    49     public void pathDone() {

    50         delegate.pathDone();

    51     }

    52 

    53     @Override

    54     public void closePath() {

    55         delegate.closePath();

    56     }

    57 

    58     @Override

    59     public long getNativeConsumer() {

    60         return 0;

    61     }

    62 

    63     @Override

    64     public void quadTo(final float x1, final float y1,

    65                        final float xe, final float ye)

    66     {

    67         // Test if curve is too small:

    68         float dx = (xe - cx);

    69         float dy = (ye - cy);

    70 

    71         if ((dx * dx + dy * dy) <= SQUARE_TOLERANCE) {

    72             // check control points P1:

    73             dx = (x1 - cx);

    74             dy = (y1 - cy);

    75 

    76             if ((dx * dx + dy * dy) <= SQUARE_TOLERANCE) {

    77                 return;

    78             }

    79         }

    80         delegate.quadTo(x1, y1, xe, ye);

    81         // final end point:

    82         cx = xe;

    83         cy = ye;

    84     }

    85 

    86     @Override

    87     public void curveTo(final float x1, final float y1,

    88                         final float x2, final float y2,

    89                         final float xe, final float ye)

    90     {

    91         // Test if curve is too small:

    92         float dx = (xe - cx);

    93         float dy = (ye - cy);

    94 

    95         if ((dx * dx + dy * dy) <= SQUARE_TOLERANCE) {

    96             // check control points P1:

    97             dx = (x1 - cx);

    98             dy = (y1 - cy);

    99 

   100             if ((dx * dx + dy * dy) <= SQUARE_TOLERANCE) {

   101                 // check control points P2:

   102                 dx = (x2 - cx);

   103                 dy = (y2 - cy);

   104 

   105                 if ((dx * dx + dy * dy) <= SQUARE_TOLERANCE) {

   106                     return;

   107                 }

   108             }

   109         }

   110         delegate.curveTo(x1, y1, x2, y2, xe, ye);

   111         // final end point:

   112         cx = xe;

   113         cy = ye;

   114     }

   115 

   116     @Override

   117     public void moveTo(final float xe, final float ye) {

   118         delegate.moveTo(xe, ye);

   119         // starting point:

   120         cx = xe;

   121         cy = ye;

   122     }

   123 

   124     @Override

   125     public void lineTo(final float xe, final float ye) {

   126         // Test if segment is too small:

   127         float dx = (xe - cx);

   128         float dy = (ye - cy);

   129 

   130         if ((dx * dx + dy * dy) <= SQUARE_TOLERANCE) {

   131             return;

   132         }

   133         delegate.lineTo(xe, ye);

   134         // final end point:

   135         cx = xe;

   136         cy = ye;

   137     }

   138 }