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 * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.

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

 *

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

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

 * published by the Free Software Foundation.  Oracle designates this

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

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

 *

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

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

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

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

 * accompanied this code).

 *

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

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

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

 *

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

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package sun.java2d.marlin;

import sun.awt.geom.PathConsumer2D;

final class PathSimplifier implements PathConsumer2D {

    // distance threshold in pixels (device)

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

    private static final float SQUARE_TOLERANCE = PIX_THRESHOLD * PIX_THRESHOLD;

    // members:

    private PathConsumer2D delegate;

    private float cx, cy;

    PathSimplifier() {

    }

    PathSimplifier init(final PathConsumer2D delegate) {

        this.delegate = delegate;

        return this; // fluent API

    }

    @Override

    public void pathDone() {

        delegate.pathDone();

    }

    @Override

    public void closePath() {

        delegate.closePath();

    }

    @Override

    public long getNativeConsumer() {

        return 0;

    }

    @Override

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

                       final float xe, final float ye)

    {

        // Test if curve is too small:

        float dx = (xe - cx);

        float dy = (ye - cy);

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

            // check control points P1:

            dx = (x1 - cx);

            dy = (y1 - cy);

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

                return;

            }

        }

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

        // final end point:

        cx = xe;

        cy = ye;

    }

    @Override

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

                        final float x2, final float y2,

                        final float xe, final float ye)

    {

        // Test if curve is too small:

        float dx = (xe - cx);

        float dy = (ye - cy);

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

            // check control points P1:

            dx = (x1 - cx);

            dy = (y1 - cy);

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

                // check control points P2:

                dx = (x2 - cx);

                dy = (y2 - cy);

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

                    return;

                }

            }

        }

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

        // final end point:

        cx = xe;

        cy = ye;

    }

    @Override

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

        delegate.moveTo(xe, ye);

        // starting point:

        cx = xe;

        cy = ye;

    }

    @Override

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

        // Test if segment is too small:

        float dx = (xe - cx);

        float dy = (ye - cy);

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

            return;

        }

        delegate.lineTo(xe, ye);

        // final end point:

        cx = xe;

        cy = ye;

    }

}