test/jdk/sanity/client/lib/SwingSet3/src/com/sun/swingset3/demos/spinner/JMandelbrot.java - platform/libcore - Git at Google

 /*
  * Copyright (c) 2007, 2016, 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.
  *
  * 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
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 package com.sun.swingset3.demos.spinner;

 import javax.swing.*;
 import java.awt.*;
 import java.awt.event.*;
 import java.awt.geom.Point2D;
 import java.awt.image.BufferedImage;
 import java.awt.image.DataBufferInt;
 import java.util.List;

 import com.sun.swingset3.demos.ResourceManager;

 /**
  * @author Mikhail Lapshin
  */
 public class JMandelbrot extends JComponent {

     private static final double EPSILON = 1E-16;
     private static final int MIN_WIDTH = 50;
     private static final int MIN_HEIGHT = 50;
     private static final double ZOOM_RATE = 3;
     private static final int NUM_OF_THREADS = 4;

     private Point2D center;
     public static final String CENTER_PROPERTY_NAME = "center";

     private int maxIteration = 300;
     public static final String MAX_ITERATION_PROPERTY_NAME = "maxIteration";

     private Palette palette;
     public static final String PALETTE_PROPERTY_NAME = "palette";

     private BufferedImage buffer;
     private final MandelbrotCalculator[] calculators
             = new MandelbrotCalculator[NUM_OF_THREADS];

     private double xLowLimit = -2;
     private double xHighLimit = 2;
     private double yLowLimit = -2;
     private double yHighLimit = 2;
     private double xScale = 100;
     private double yScale = 100;
     private int oldComponentWidth = (int) (xScale * (xHighLimit - xLowLimit));
     private int oldComponentHeight = (int) (yScale * (yHighLimit - yLowLimit));

     public JMandelbrot(int width, int height, Palette palette,
             ResourceManager resourceManager) {
         setPreferredSize(new Dimension(width, height));
         setMinimumSize(new Dimension(MIN_WIDTH, MIN_HEIGHT));
         calcConstants(width, height);
         setPalette(palette);
         setToolTipText(resourceManager.getString("SpinnerDemo.toolTip"));
         installListeners();
     }

     private void calcConstants() {
         calcConstants(getWidth(), getHeight());
     }

     private void calcConstants(int width, int height) {
         if ((width >= MIN_WIDTH) && (height >= MIN_HEIGHT)) {
             double oldIntervalWidth = xHighLimit - xLowLimit;
             double oldIntervalHeight = yHighLimit - yLowLimit;
             double newIntervalWidth
                     = width * oldIntervalWidth / oldComponentWidth;
             double newIntervalHeight
                     = height * oldIntervalHeight / oldComponentHeight;
             double xDiff = newIntervalWidth - oldIntervalWidth;
             double yDiff = newIntervalHeight - oldIntervalHeight;
             xLowLimit -= xDiff / 2;
             xHighLimit += xDiff / 2;
             yLowLimit -= yDiff / 2;
             yHighLimit += yDiff / 2;
             buffer = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
             oldComponentWidth = width;
             oldComponentHeight = height;
             setCenter(calcCenter());
         }
     }

     private void installListeners() {
         addMouseListener(new MouseAdapter() {
             @Override
             public void mousePressed(MouseEvent e) {
                 int xCoord = e.getX();
                 int yCoord = e.getY();
                 double intervalWidth = xHighLimit - xLowLimit;
                 double intervalHeight = yHighLimit - yLowLimit;
                 double x = intervalWidth * xCoord / getWidth() + xLowLimit;
                 double y = intervalHeight * yCoord / getHeight() + yLowLimit;

                 double newIntervalWidth;
                 double newIntervalHeight;
                 if (e.getButton() == MouseEvent.BUTTON1) {
                     boolean limitReached = false;
                     newIntervalWidth = intervalWidth / ZOOM_RATE;
                     if ((newIntervalWidth / getWidth()) < EPSILON) {
                         newIntervalWidth = intervalWidth;
                         limitReached = true;
                     }
                     newIntervalHeight = intervalHeight / ZOOM_RATE;
                     if ((newIntervalHeight / getHeight()) < EPSILON) {
                         newIntervalHeight = intervalHeight;
                         limitReached = true;
                     }
                     if (!limitReached) {
                         xLowLimit = x - (x - xLowLimit) / ZOOM_RATE;
                         yLowLimit = y - (y - yLowLimit) / ZOOM_RATE;
                     }
                 } else {
                     newIntervalWidth = intervalWidth * ZOOM_RATE;
                     newIntervalHeight = intervalHeight * ZOOM_RATE;
                     xLowLimit = x - (x - xLowLimit) * ZOOM_RATE;
                     yLowLimit = y - (y - yLowLimit) * ZOOM_RATE;
                 }

                 xHighLimit = xLowLimit + newIntervalWidth;
                 yHighLimit = yLowLimit + newIntervalHeight;

                 setCenter(calcCenter());

                 xScale = getWidth() / newIntervalWidth;
                 yScale = getHeight() / newIntervalHeight;

                 calculatePicture();
             }
         });

         addComponentListener(new ComponentListener() {
             @Override
             public void componentResized(ComponentEvent e) {
                 calcConstants();
                 calculatePicture();
                 repaint();
             }

             @Override
             public void componentMoved(ComponentEvent e) {
             }

             @Override
             public void componentShown(ComponentEvent e) {
             }

             @Override
             public void componentHidden(ComponentEvent e) {
             }
         });
     }

     //<snip>Use SwingWorker to asynchronously calculate parts of the picture
     public void calculatePicture() {
         int yStep = getHeight() / NUM_OF_THREADS;
         int yStart = 0;
         for (int i = 0; i < calculators.length; i++) {
             if ((calculators[i] != null) && !calculators[i].isDone()) {
                 calculators[i].cancel(true);
             }
             int yEnd = i == calculators.length - 1 ? getHeight() : yStart + yStep;
             calculators[i] = new MandelbrotCalculator(yStart, yEnd);
             calculators[i].execute();
             yStart = yEnd;
         }
     }
     //</snip>

     private Point2D calcCenter() {
         return new Point2D.Double(xLowLimit + (xHighLimit - xLowLimit) / 2,
                 yLowLimit + (yHighLimit - yLowLimit) / 2);
     }

     @Override
     protected void paintComponent(Graphics g) {
         super.paintComponent(g);
         g.drawImage(buffer, 0, 0, null);
     }

     //<snip>Use SwingWorker to asynchronously calculate parts of the picture
     private class MandelbrotCalculator extends SwingWorker<Object, Object> {

         private final int yStart;
         private final int yEnd;

         public MandelbrotCalculator(int yStart, int yEnd) {
             this.yStart = yStart;
             this.yEnd = yEnd;
         }

         @Override
         protected Object doInBackground() throws Exception {
             int[] data = ((DataBufferInt) buffer.getRaster().getDataBuffer()).getData();

             double xArr[] = new double[buffer.getWidth()];

             for (int i = 0; i < xArr.length; i++) {
                 xArr[i] = i / xScale + xLowLimit;
             }

             double yArr[] = new double[yEnd - yStart];

             for (int i = 0; i < yArr.length; i++) {
                 yArr[i] = (yStart + i) / yScale + yLowLimit;
             }

             int i = yStart * buffer.getWidth();

             for (double y : yArr) {
                 for (double x : xArr) {
                     int value = calcValue(x, y);

                     data[i] = value == maxIteration ? 0 : palette.getRgbColor(value);

                     i++;
                 }
                 if (Thread.currentThread().isInterrupted()) {
                     return null;
                 }
                 publish();
             }
             return null;
         }

         private int calcValue(double x, double y) {
             double x0 = x;
             double y0 = y;

             for (int i = 0; i < maxIteration; i++) {
                 double x2 = x * x;
                 double y2 = y * y;

                 if (x2 + y2 > 4) {
                     return i;
                 }

                 y = 2 * x * y + y0;
                 x = x2 - y2 + x0;
             }

             return maxIteration;
         }

         @Override
         protected void process(List<Object> chunks) {
             repaint();
         }
     }
     //</snip>

     // Getters and Setters
     public int getMaxIteration() {
         return maxIteration;
     }

     public void setMaxIteration(int maxIteration) {
         int oldValue = this.maxIteration;
         this.maxIteration = maxIteration;
         firePropertyChange(MAX_ITERATION_PROPERTY_NAME, oldValue, maxIteration);
         palette.setSize(maxIteration);
     }

     public double getXHighLimit() {
         return xHighLimit;
     }

     public double getXLowLimit() {
         return xLowLimit;
     }

     public double getYLowLimit() {
         return yLowLimit;
     }

     public double getYHighLimit() {
         return yHighLimit;
     }

     public Point2D getCenter() {
         return center;
     }

     public void setCenter(Point2D coords) {
         Point2D oldValue = this.center;
         this.center = coords;

         double width = xHighLimit - xLowLimit;
         double height = yHighLimit - yLowLimit;

         xLowLimit = coords.getX() - width / 2;
         xHighLimit = xLowLimit + width;
         yLowLimit = coords.getY() - height / 2;
         yHighLimit = yLowLimit + height;

         firePropertyChange(CENTER_PROPERTY_NAME, oldValue, coords);
     }

     public Palette getPalette() {
         return palette;
     }

     public void setPalette(Palette palette) {
         Palette oldValue = this.palette;
         palette.setSize(maxIteration);
         this.palette = palette;
         firePropertyChange(PALETTE_PROPERTY_NAME, oldValue, palette);
     }
 }
	/*
	* Copyright (c) 2007, 2016, 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.
	*
	* 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
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/
	package com.sun.swingset3.demos.spinner;

	import javax.swing.*;
	import java.awt.*;
	import java.awt.event.*;
	import java.awt.geom.Point2D;
	import java.awt.image.BufferedImage;
	import java.awt.image.DataBufferInt;
	import java.util.List;

	import com.sun.swingset3.demos.ResourceManager;

	/**
	* @author Mikhail Lapshin
	*/
	public class JMandelbrot extends JComponent {

	private static final double EPSILON = 1E-16;
	private static final int MIN_WIDTH = 50;
	private static final int MIN_HEIGHT = 50;
	private static final double ZOOM_RATE = 3;
	private static final int NUM_OF_THREADS = 4;

	private Point2D center;
	public static final String CENTER_PROPERTY_NAME = "center";

	private int maxIteration = 300;
	public static final String MAX_ITERATION_PROPERTY_NAME = "maxIteration";

	private Palette palette;
	public static final String PALETTE_PROPERTY_NAME = "palette";

	private BufferedImage buffer;
	private final MandelbrotCalculator[] calculators
	= new MandelbrotCalculator[NUM_OF_THREADS];

	private double xLowLimit = -2;
	private double xHighLimit = 2;
	private double yLowLimit = -2;
	private double yHighLimit = 2;
	private double xScale = 100;
	private double yScale = 100;
	private int oldComponentWidth = (int) (xScale * (xHighLimit - xLowLimit));
	private int oldComponentHeight = (int) (yScale * (yHighLimit - yLowLimit));

	public JMandelbrot(int width, int height, Palette palette,
	ResourceManager resourceManager) {
	setPreferredSize(new Dimension(width, height));
	setMinimumSize(new Dimension(MIN_WIDTH, MIN_HEIGHT));
	calcConstants(width, height);
	setPalette(palette);
	setToolTipText(resourceManager.getString("SpinnerDemo.toolTip"));
	installListeners();
	}

	private void calcConstants() {
	calcConstants(getWidth(), getHeight());
	}

	private void calcConstants(int width, int height) {
	if ((width >= MIN_WIDTH) && (height >= MIN_HEIGHT)) {
	double oldIntervalWidth = xHighLimit - xLowLimit;
	double oldIntervalHeight = yHighLimit - yLowLimit;
	double newIntervalWidth
	= width * oldIntervalWidth / oldComponentWidth;
	double newIntervalHeight
	= height * oldIntervalHeight / oldComponentHeight;
	double xDiff = newIntervalWidth - oldIntervalWidth;
	double yDiff = newIntervalHeight - oldIntervalHeight;
	xLowLimit -= xDiff / 2;
	xHighLimit += xDiff / 2;
	yLowLimit -= yDiff / 2;
	yHighLimit += yDiff / 2;
	buffer = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
	oldComponentWidth = width;
	oldComponentHeight = height;
	setCenter(calcCenter());
	}
	}

	private void installListeners() {
	addMouseListener(new MouseAdapter() {
	@Override
	public void mousePressed(MouseEvent e) {
	int xCoord = e.getX();
	int yCoord = e.getY();
	double intervalWidth = xHighLimit - xLowLimit;
	double intervalHeight = yHighLimit - yLowLimit;
	double x = intervalWidth * xCoord / getWidth() + xLowLimit;
	double y = intervalHeight * yCoord / getHeight() + yLowLimit;

	double newIntervalWidth;
	double newIntervalHeight;
	if (e.getButton() == MouseEvent.BUTTON1) {
	boolean limitReached = false;
	newIntervalWidth = intervalWidth / ZOOM_RATE;
	if ((newIntervalWidth / getWidth()) < EPSILON) {
	newIntervalWidth = intervalWidth;
	limitReached = true;
	}
	newIntervalHeight = intervalHeight / ZOOM_RATE;
	if ((newIntervalHeight / getHeight()) < EPSILON) {
	newIntervalHeight = intervalHeight;
	limitReached = true;
	}
	if (!limitReached) {
	xLowLimit = x - (x - xLowLimit) / ZOOM_RATE;
	yLowLimit = y - (y - yLowLimit) / ZOOM_RATE;
	}
	} else {
	newIntervalWidth = intervalWidth * ZOOM_RATE;
	newIntervalHeight = intervalHeight * ZOOM_RATE;
	xLowLimit = x - (x - xLowLimit) * ZOOM_RATE;
	yLowLimit = y - (y - yLowLimit) * ZOOM_RATE;
	}

	xHighLimit = xLowLimit + newIntervalWidth;
	yHighLimit = yLowLimit + newIntervalHeight;

	setCenter(calcCenter());

	xScale = getWidth() / newIntervalWidth;
	yScale = getHeight() / newIntervalHeight;

	calculatePicture();
	}
	});

	addComponentListener(new ComponentListener() {
	@Override
	public void componentResized(ComponentEvent e) {
	calcConstants();
	calculatePicture();
	repaint();
	}

	@Override
	public void componentMoved(ComponentEvent e) {
	}

	@Override
	public void componentShown(ComponentEvent e) {
	}

	@Override
	public void componentHidden(ComponentEvent e) {
	}
	});
	}

	//<snip>Use SwingWorker to asynchronously calculate parts of the picture
	public void calculatePicture() {
	int yStep = getHeight() / NUM_OF_THREADS;
	int yStart = 0;
	for (int i = 0; i < calculators.length; i++) {
	if ((calculators[i] != null) && !calculators[i].isDone()) {
	calculators[i].cancel(true);
	}
	int yEnd = i == calculators.length - 1 ? getHeight() : yStart + yStep;
	calculators[i] = new MandelbrotCalculator(yStart, yEnd);
	calculators[i].execute();
	yStart = yEnd;
	}
	}
	//</snip>

	private Point2D calcCenter() {
	return new Point2D.Double(xLowLimit + (xHighLimit - xLowLimit) / 2,
	yLowLimit + (yHighLimit - yLowLimit) / 2);
	}

	@Override
	protected void paintComponent(Graphics g) {
	super.paintComponent(g);
	g.drawImage(buffer, 0, 0, null);
	}

	//<snip>Use SwingWorker to asynchronously calculate parts of the picture
	private class MandelbrotCalculator extends SwingWorker<Object, Object> {

	private final int yStart;
	private final int yEnd;

	public MandelbrotCalculator(int yStart, int yEnd) {
	this.yStart = yStart;
	this.yEnd = yEnd;
	}

	@Override
	protected Object doInBackground() throws Exception {
	int[] data = ((DataBufferInt) buffer.getRaster().getDataBuffer()).getData();

	double xArr[] = new double[buffer.getWidth()];

	for (int i = 0; i < xArr.length; i++) {
	xArr[i] = i / xScale + xLowLimit;
	}

	double yArr[] = new double[yEnd - yStart];

	for (int i = 0; i < yArr.length; i++) {
	yArr[i] = (yStart + i) / yScale + yLowLimit;
	}

	int i = yStart * buffer.getWidth();

	for (double y : yArr) {
	for (double x : xArr) {
	int value = calcValue(x, y);

	data[i] = value == maxIteration ? 0 : palette.getRgbColor(value);

	i++;
	}
	if (Thread.currentThread().isInterrupted()) {
	return null;
	}
	publish();
	}
	return null;
	}

	private int calcValue(double x, double y) {
	double x0 = x;
	double y0 = y;

	for (int i = 0; i < maxIteration; i++) {
	double x2 = x * x;
	double y2 = y * y;

	if (x2 + y2 > 4) {
	return i;
	}

	y = 2 * x * y + y0;
	x = x2 - y2 + x0;
	}

	return maxIteration;
	}

	@Override
	protected void process(List<Object> chunks) {
	repaint();
	}
	}
	//</snip>

	// Getters and Setters
	public int getMaxIteration() {
	return maxIteration;
	}

	public void setMaxIteration(int maxIteration) {
	int oldValue = this.maxIteration;
	this.maxIteration = maxIteration;
	firePropertyChange(MAX_ITERATION_PROPERTY_NAME, oldValue, maxIteration);
	palette.setSize(maxIteration);
	}

	public double getXHighLimit() {
	return xHighLimit;
	}

	public double getXLowLimit() {
	return xLowLimit;
	}

	public double getYLowLimit() {
	return yLowLimit;
	}

	public double getYHighLimit() {
	return yHighLimit;
	}

	public Point2D getCenter() {
	return center;
	}

	public void setCenter(Point2D coords) {
	Point2D oldValue = this.center;
	this.center = coords;

	double width = xHighLimit - xLowLimit;
	double height = yHighLimit - yLowLimit;

	xLowLimit = coords.getX() - width / 2;
	xHighLimit = xLowLimit + width;
	yLowLimit = coords.getY() - height / 2;
	yHighLimit = yLowLimit + height;

	firePropertyChange(CENTER_PROPERTY_NAME, oldValue, coords);
	}

	public Palette getPalette() {
	return palette;
	}

	public void setPalette(Palette palette) {
	Palette oldValue = this.palette;
	palette.setSize(maxIteration);
	this.palette = palette;
	firePropertyChange(PALETTE_PROPERTY_NAME, oldValue, palette);
	}
	}