我有带有开始按钮的 JFrame
,它会触发 Julia Set 的计算。
点击开始按钮时执行的代码如下:
public void actionPerformed(ActionEvent aActionEvent)
{
String strCmd = aActionEvent.getActionCommand();
if (strCmd.equals("Start"))
{
m_cCanvas.init();
m_cSMsg = "c = " + Double.toString(m_dReal) + " + " + "j*" + Double.toString(m_dImag);
m_bRunning = true;
this.handleCalculation();
}
else if (aActionEvent.getSource() == m_cTReal)
过去工作正常,只是应用程序无法再关闭。因此,我尝试在单独的方法中使用 m_bRunning
,这样 actionPerformed()
就不会一直被阻止,看看是否有帮助,然后设置 m_bRunning = false
在方法 stop()
中,该方法在窗口关闭时调用:
public void run()
{
if(m_bRunning)
{
this.handleCalculation();
}
}
方法 run()
在 while(true)
循环中从主类调用。
但不幸的是,这并没有解决问题,我现在也没有任何输出到 Canvas 或使用 System.out.println()
进行任何调试跟踪。有人能指出我正确的方向吗?
编辑:
以下是整个文件:
// cMain.java
package juliaSet;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.Dimension;
public class cMain {
public static void main(String[] args)
{
int windowWidth = 1000;//(int)screenSize.getWidth() - 200;
int windowHeight = 800;//(int)screenSize.getHeight() - 50;
int plotWidth = 400;//(int)screenSize.getWidth() - 600;
int plotHeight = 400;//(int)screenSize.getHeight() - 150;
JuliaSet cJuliaSet = new JuliaSet("Julia Set", windowWidth, windowHeight, plotWidth, plotHeight);
cJuliaSet.setVisible(true);
while(true)
{
cJuliaSet.run();
}
}
}
// JuliaSet.java
package juliaSet;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
import java.util.Random;
import java.io.*;
import java.lang.ref.*;
public class JuliaSet extends JFrame implements ActionListener
{
private JButton m_cBStart;
private JTextField m_cTReal;
private JTextField m_cTImag;
private JTextField m_cTDivergThresh;
private JLabel m_cLReal;
private JLabel m_cLImag;
private JLabel m_cLDivergThresh;
private int m_iDivergThresh = 10;
private String m_cMsgDivThresh = "Divergence threshold = " + m_iDivergThresh;
private JuliaCanvas m_cCanvas;
private int m_iPlotWidth; // number of cells
private int m_iPlotHeight; // number of cells
private Boolean m_bRunning = false;
private double m_dReal = 0.3;
private double m_dImag = -0.5;
private String m_cSMsg = "c = " + Double.toString(m_dReal) + " + " + "j*" + Double.toString(m_dImag);
private String m_cMsgIter = "x = 0, y = 0";
private Complex m_cCoordPlane[][];
private double m_dAbsSqValues[][];
private int m_iIterations[][];
private Complex m_cSummand;
private BufferedImage m_cBackGroundImage = null;
private FileWriter m_cFileWriter;
private BufferedWriter m_cBufferedWriter;
private String m_sFileName = "log.txt";
private Boolean m_bWriteLog = false;
private static final double PLOTMAX = 2.0; // we'll have symmetric axes
// ((0,0) at the centre of the
// plot
private static final int MAXITER = 0xff;
JuliaSet(String aTitle, int aFrameWidth, int aFrameHeight, int aPlotWidth, int aPlotHeight)
{
super(aTitle);
this.setSize(aFrameWidth, aFrameHeight);
m_iPlotWidth = aPlotWidth;
m_iPlotHeight = aPlotHeight;
m_cSummand = new Complex(m_dReal, m_dImag);
m_cBackGroundImage = new BufferedImage(aFrameWidth, aFrameHeight, BufferedImage.TYPE_INT_RGB);
this.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
stop();
super.windowClosing(e);
System.exit(0);
}
});
GridBagLayout cLayout = new GridBagLayout();
GridBagConstraints cConstraints = new GridBagConstraints();
this.setLayout(cLayout);
m_cCanvas = new JuliaCanvas(m_iPlotWidth, m_iPlotHeight);
m_cCanvas.setSize(m_iPlotWidth, m_iPlotHeight);
m_cBStart = new JButton("Start");
m_cBStart.addActionListener(this);
m_cTReal = new JTextField(5);
m_cTReal.addActionListener(this);
m_cTImag = new JTextField(5);
m_cTImag.addActionListener(this);
m_cTDivergThresh = new JTextField(5);
m_cTDivergThresh.addActionListener(this);
m_cLReal = new JLabel("Re(c):");
m_cLImag = new JLabel("Im(c):");
m_cLDivergThresh = new JLabel("Divergence Threshold:");
cConstraints.insets.top = 3;
cConstraints.insets.bottom = 3;
cConstraints.insets.right = 3;
cConstraints.insets.left = 3;
// cCanvas
cConstraints.gridx = 0;
cConstraints.gridy = 0;
cLayout.setConstraints(m_cCanvas, cConstraints);
this.add(m_cCanvas);
// m_cLReal
cConstraints.gridx = 0;
cConstraints.gridy = 1;
cLayout.setConstraints(m_cLReal, cConstraints);
this.add(m_cLReal);
// m_cTReal
cConstraints.gridx = 1;
cConstraints.gridy = 1;
cLayout.setConstraints(m_cTReal, cConstraints);
this.add(m_cTReal);
// m_cLImag
cConstraints.gridx = 0;
cConstraints.gridy = 2;
cLayout.setConstraints(m_cLImag, cConstraints);
this.add(m_cLImag);
// m_cTImag
cConstraints.gridx = 1;
cConstraints.gridy = 2;
cLayout.setConstraints(m_cTImag, cConstraints);
this.add(m_cTImag);
// m_cLDivergThresh
cConstraints.gridx = 0;
cConstraints.gridy = 3;
cLayout.setConstraints(m_cLDivergThresh, cConstraints);
this.add(m_cLDivergThresh);
// m_cTDivergThresh
cConstraints.gridx = 1;
cConstraints.gridy = 3;
cLayout.setConstraints(m_cTDivergThresh, cConstraints);
this.add(m_cTDivergThresh);
// m_cBStart
cConstraints.gridx = 0;
cConstraints.gridy = 4;
cLayout.setConstraints(m_cBStart, cConstraints);
this.add(m_cBStart);
if (m_bWriteLog)
{
try
{
m_cFileWriter = new FileWriter(m_sFileName, false);
m_cBufferedWriter = new BufferedWriter(m_cFileWriter);
} catch (IOException ex) {
System.out.println("Error opening file '" + m_sFileName + "'");
}
}
this.repaint();
this.transformCoordinates();
}
public synchronized void stop()
{
if (m_bRunning)
{
m_bRunning = false;
boolean bRetry = true;
}
if (m_bWriteLog)
{
try {
m_cBufferedWriter.close();
m_cFileWriter.close();
} catch (IOException ex) {
System.out.println("Error closing file '" + m_sFileName + "'");
}
}
}
public void collectGarbage()
{
Object cObj = new Object();
WeakReference ref = new WeakReference<Object>(cObj);
cObj = null;
while(ref.get() != null) {
System.gc();
}
}
public void setSummand(Complex aSummand)
{
m_cSummand.setIm(aSummand.getIm());
m_dImag = aSummand.getIm();
m_cSummand.setRe(aSummand.getRe());
m_dReal = aSummand.getRe();
m_cSMsg = "c = " + Double.toString(m_dReal) + " + " + "j*" + Double.toString(m_dImag);
}
public void paint(Graphics aGraphics)
{
Graphics cScreenGraphics = aGraphics;
// render on background image
aGraphics = m_cBackGroundImage.getGraphics();
this.paintComponents(aGraphics);
// drawString() calls are debug code only....
aGraphics.setColor(Color.BLACK);
aGraphics.drawString(m_cSMsg, 10, 450);
aGraphics.drawString(m_cMsgIter, 10, 465);
aGraphics.drawString(m_cMsgDivThresh, 10, 480);
// rendering is done, draw background image to on screen graphics
cScreenGraphics.drawImage(m_cBackGroundImage, 0, 0, null);
}
public void actionPerformed(ActionEvent aActionEvent)
{
String strCmd = aActionEvent.getActionCommand();
if (strCmd.equals("Start"))
{
m_cCanvas.init();
m_cSMsg = "c = " + Double.toString(m_dReal) + " + " + "j*" + Double.toString(m_dImag);
m_bRunning = true;
}
else if (aActionEvent.getSource() == m_cTReal)
{
m_dReal = Double.parseDouble(m_cTReal.getText());
m_cSMsg = "c = " + Double.toString(m_dReal) + " + " + "j*" + Double.toString(m_dImag);
m_cSummand.setRe(m_dReal);
}
else if (aActionEvent.getSource() == m_cTImag)
{
m_dImag = Double.parseDouble(m_cTImag.getText());
m_cSMsg = "c = " + Double.toString(m_dReal) + " + " + "j*" + Double.toString(m_dImag);
m_cSummand.setIm(m_dImag);
}
else if (aActionEvent.getSource() == m_cTDivergThresh)
{
m_iDivergThresh = Integer.parseInt(m_cTDivergThresh.getText());
m_cMsgDivThresh = "Divergence threshold = " + m_iDivergThresh;
}
this.update(this.getGraphics());
}
public void transformCoordinates()
{
double dCanvasHeight = (double) m_cCanvas.getHeight();
double dCanvasWidth = (double) m_cCanvas.getWidth();
// init matrix with same amount of elements as pixels in canvas
m_cCoordPlane = new Complex[(int) dCanvasHeight][(int) dCanvasWidth];
double iPlotRange = 2 * PLOTMAX;
for (int i = 0; i < dCanvasHeight; i++)
{
for (int j = 0; j < dCanvasWidth; j++)
{
m_cCoordPlane[i][j] = new Complex((i - (dCanvasWidth / 2)) * iPlotRange / dCanvasWidth,
(j - (dCanvasHeight / 2)) * iPlotRange / dCanvasHeight);
}
}
}
public void calcAbsSqValues()
{
int iCanvasHeight = m_cCanvas.getHeight();
int iCanvasWidth = m_cCanvas.getWidth();
// init matrix with same amount of elements as pixels in canvas
m_dAbsSqValues = new double[iCanvasHeight][iCanvasWidth];
m_iIterations = new int[iCanvasHeight][iCanvasWidth];
Complex cSum = new Complex();
if (m_bWriteLog) {
try
{
m_cBufferedWriter.write("m_iIterations[][] =");
m_cBufferedWriter.newLine();
}
catch (IOException ex)
{
System.out.println("Error opening file '" + m_sFileName + "'");
}
}
for (int i = 0; i < iCanvasHeight; i++)
{
for (int j = 0; j < iCanvasWidth; j++)
{
cSum.setRe(m_cCoordPlane[i][j].getRe());
cSum.setIm(m_cCoordPlane[i][j].getIm());
m_iIterations[i][j] = 0;
do
{
m_iIterations[i][j]++;
cSum.square();
cSum.add(m_cSummand);
m_dAbsSqValues[i][j] = cSum.getAbsSq();
} while ((m_iIterations[i][j] < MAXITER) && (m_dAbsSqValues[i][j] < m_iDivergThresh));
this.calcColour(i, j, m_iIterations[i][j]);
m_cMsgIter = "x = " + i + " , y = " + j;
if(m_bWriteLog)
{
System.out.println(m_cMsgIter);
System.out.flush();
}
if (m_bWriteLog) {
try
{
m_cBufferedWriter.write(Integer.toString(m_iIterations[i][j]));
m_cBufferedWriter.write(" ");
}
catch (IOException ex) {
System.out.println("Error writing to file '" + m_sFileName + "'");
}
}
}
if (m_bWriteLog) {
try
{
m_cBufferedWriter.newLine();
}
catch (IOException ex) {
System.out.println("Error writing to file '" + m_sFileName + "'");
}
}
}
m_dAbsSqValues = null;
m_iIterations = null;
cSum = null;
}
private void calcColour(int i, int j, int aIterations)
{
Color cColour = Color.getHSBColor((int) Math.pow(aIterations, 4), 0xff,
0xff * ((aIterations < MAXITER) ? 1 : 0));
m_cCanvas.setPixelColour(i, j, cColour);
cColour = null;
}
private void handleCalculation()
{
Complex cSummand = new Complex();
for(int i = -800; i <= 800; i++)
{
for(int j = -800; j <= 800; j++)
{
cSummand.setRe(((double)i)/1000.0);
cSummand.setIm(((double)j)/1000.0);
this.setSummand(cSummand);
this.calcAbsSqValues();
this.getCanvas().paint(m_cCanvas.getGraphics());
this.paint(this.getGraphics());
}
}
cSummand = null;
this.collectGarbage();
System.gc();
System.runFinalization();
}
public boolean isRunning()
{
return m_bRunning;
}
public void setRunning(boolean aRunning)
{
m_bRunning = aRunning;
}
public Canvas getCanvas()
{
return m_cCanvas;
}
public void run()
{
if(m_bRunning)
{
this.handleCalculation();
}
}
}
class JuliaCanvas extends Canvas
{
private int m_iWidth;
private int m_iHeight;
private Random m_cRnd;
private BufferedImage m_cBackGroundImage = null;
private int m_iRed[][];
private int m_iGreen[][];
private int m_iBlue[][];
JuliaCanvas(int aWidth, int aHeight)
{
m_iWidth = aWidth;
m_iHeight = aHeight;
m_cRnd = new Random();
m_cRnd.setSeed(m_cRnd.nextLong());
m_cBackGroundImage = new BufferedImage(m_iWidth, m_iHeight, BufferedImage.TYPE_INT_RGB);
m_iRed = new int[m_iHeight][m_iWidth];
m_iGreen = new int[m_iHeight][m_iWidth];
m_iBlue = new int[m_iHeight][m_iWidth];
}
public void init() {
}
public void setPixelColour(int i, int j, Color aColour)
{
m_iRed[i][j] = aColour.getRed();
m_iGreen[i][j] = aColour.getGreen();
m_iBlue[i][j] = aColour.getBlue();
}
private int getRandomInt(double aProbability)
{
return (m_cRnd.nextDouble() < aProbability) ? 1 : 0;
}
@Override
public void paint(Graphics aGraphics)
{
// store on screen graphics
Graphics cScreenGraphics = aGraphics;
// render on background image
aGraphics = m_cBackGroundImage.getGraphics();
for (int i = 0; i < m_iWidth; i++)
{
for (int j = 0; j < m_iHeight; j++)
{
Color cColor = new Color(m_iRed[i][j], m_iGreen[i][j], m_iBlue[i][j]);
aGraphics.setColor(cColor);
aGraphics.drawRect(i, j, 0, 0);
cColor = null;
}
}
// rendering is done, draw background image to on screen graphics
cScreenGraphics.drawImage(m_cBackGroundImage, 1, 1, null);
}
@Override
public void update(Graphics aGraphics)
{
paint(aGraphics);
}
}
class Complex {
private double m_dRe;
private double m_dIm;
public Complex()
{
m_dRe = 0;
m_dIm = 0;
}
public Complex(double aRe, double aIm)
{
m_dRe = aRe;
m_dIm = aIm;
}
public Complex(Complex aComplex)
{
m_dRe = aComplex.m_dRe;
m_dIm = aComplex.m_dIm;
}
public double getRe() {
return m_dRe;
}
public void setRe(double adRe)
{
m_dRe = adRe;
}
public double getIm() {
return m_dIm;
}
public void setIm(double adIm)
{
m_dIm = adIm;
}
public void add(Complex acComplex)
{
m_dRe += acComplex.getRe();
m_dIm += acComplex.getIm();
}
public void square()
{
double m_dReSave = m_dRe;
m_dRe = (m_dRe * m_dRe) - (m_dIm * m_dIm);
m_dIm = 2 * m_dReSave * m_dIm;
}
public double getAbsSq()
{
return ((m_dRe * m_dRe) + (m_dIm * m_dIm));
}
}
最佳答案
我引用@MadProgrammer 最近的评论(包括链接)
“Swing 是单线程的,您无法更改它,所有事件都会发布到事件队列并由事件调度线程处理,请参阅 Concurrency in Swing 了解更多详细信息,并至少查看 Worker Threads and SwingWorker一种可能的解决方案”
您的代码中只有一个线程。该线程正忙于计算,无法响应 GUI 中的事件。您必须将计算分离到另一个线程中,该线程定期更新窗口中显示的数量。我坚持认为,有关链接的更多信息由 @MadProgrammer 提供。
更新:正如@Yusuf 所指出的,启动 JFrame 的正确方法是
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new JuliaSet("Julia Set", windowWidth, windowHeight, plotWidth, plotHeight);
}
});
设置框架在构造时可见,并在按下开始按钮时开始计算。
关于java - 绘画 Canvas 和 System.out.println() 不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36083712/