JDK14/Java14源码在线阅读

/*
 *
 * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package java2d.demos.Arcs_Curves;


import java.awt.*;
import java.awt.geom.Ellipse2D;
import java2d.AnimatingSurface;
import static java.awt.Color.*;


/**
 * Ellipse2D 25 animated expanding ellipses.
 */
@SuppressWarnings("serial")
public final class Ellipses extends AnimatingSurface {

    private static Color[] colors = {
        BLUE, CYAN, GREEN, MAGENTA, ORANGE, PINK, RED,
        YELLOW, LIGHT_GRAY, WHITE };
    private Ellipse2D.Float[] ellipses;
    private double[] esize;
    private float[] estroke;
    private double maxSize;

    public Ellipses() {
        setBackground(BLACK);
        ellipses = new Ellipse2D.Float[25];
        esize = new double[ellipses.length];
        estroke = new float[ellipses.length];
        for (int i = 0; i < ellipses.length; i++) {
            ellipses[i] = new Ellipse2D.Float();
            getRandomXY(i, 20 * Math.random(), 200, 200);
        }
    }

    public void getRandomXY(int i, double size, int w, int h) {
        esize[i] = size;
        estroke[i] = 1.0f;
        double x = Math.random() * (w - (maxSize / 2));
        double y = Math.random() * (h - (maxSize / 2));
        ellipses[i].setFrame(x, y, size, size);
    }

    @Override
    public void reset(int w, int h) {
        maxSize = w / 10;
        for (int i = 0; i < ellipses.length; i++) {
            getRandomXY(i, maxSize * Math.random(), w, h);
        }
    }

    @Override
    public void step(int w, int h) {
        for (int i = 0; i < ellipses.length; i++) {
            estroke[i] += 0.025f;
            esize[i]++;
            if (esize[i] > maxSize) {
                getRandomXY(i, 1, w, h);
            } else {
                ellipses[i].setFrame(ellipses[i].getX(), ellipses[i].getY(),
                        esize[i], esize[i]);
            }
        }

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