/*
* 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.
*
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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);
}
}