Swing下的二维随机游走轨道模拟

//import javax.imageio.ImageIO;
import javax.swing.*;


import java.awt.event.*;
//import java.awt.image.BufferedImage;
import java.awt.*;
import java.io.IOException;


public class SwingRandom extends JFrame
{


/**
* 
*/
private static final long serialVersionUID = 1L;


public SwingRandom()
{


add(new NewPanel());
}


public static void main(String[] args) throws IOException
{
SwingRandom frame = new SwingRandom();


frame.setTitle("2Random");


frame.setSize(1292, 812);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
// 输出图片
// BufferedImage image = new BufferedImage(frame.getWidth(),
// frame.getHeight(), BufferedImage.TYPE_INT_RGB);
// Graphics2D g2 = image.createGraphics();
// frame.paint(g2);
// ImageIO.write(image, "png", new java.io.File("d:\Rnd.png"));
}
}


class NewPanel extends JPanel
{
/**
* 
*/
private static final long serialVersionUID = 1L;


NewPanel()
{
jb.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
repaint();
}
});
jb.setFocusPainted(false);
this.add(jb);
jb.setBackground(Color.yellow);
}


JButton jb = new JButton("按下重绘");


protected void paintComponent(Graphics g)
{
super.paintComponent(g);

final int GIRD = 295000;     //步数

final int STEP = 1;               //步距

int[] xpoint = new int[GIRD];
int[] ypoint = new int[GIRD];
xpoint[0] = 1292 / 2;
ypoint[0] = 812 / 2;
for (int i = 1; i < GIRD; i++)
{
int rnd = (int) (Math.random() * 4);
switch (rnd)
{
case 0:
xpoint[i] = xpoint[i - 1] + STEP;      
ypoint[i] = ypoint[i - 1];


break;
case 1:
ypoint[i] = ypoint[i - 1] + STEP;
xpoint[i] = xpoint[i - 1];


break;
case 2:
xpoint[i] = xpoint[i - 1] - STEP;
ypoint[i] = ypoint[i - 1];


break;
case 3:
ypoint[i] = ypoint[i - 1] - STEP;
xpoint[i] = xpoint[i - 1];


break;
}
if (xpoint[i] <= 5 || xpoint[i] > 1292 - 20 || ypoint[i] <= 5
|| ypoint[i] > 812 - 100)
{
i = 0;
}


}

        g.setColor(Color.blue);
g.drawPolyline(xpoint, ypoint, GIRD);
}

}

----------运行效果----------

295000步，步距1

----------190000步，步距2----------

----------20000步，步距5----------

注意：试验的时候尽量保证GIRD * STEP * STEP < 500000

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