用java做的滚动的正弦曲线

王朝java/jsp·作者佚名  2006-01-10
窄屏简体版  字體: |||超大  

//windows API写过滚动正弦曲线,感觉用java做起来代码会比较小,试了一下,但感觉界面不如windows好.

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.Timer;

public class SinWave extends JFrame{

private static final int NUM = 1000;

private static final double TWOPI = 2 * 3.14;

private static final int STEP = 10;

private int []xPoints = new int[NUM];

private int []yPoints = new int[NUM];

private int []yCopyPoints = new int[STEP];

private int width,height;

private Timer timer;

public SinWave()

{

setSize(500,400);

this.setBackground(Color.white);

Dimension scrSize=Toolkit.getDefaultToolkit().getScreenSize();

width = getWidth();

height = getHeight();

this.setLocation((scrSize.width-width)/2,(scrSize.height-height)/2);

for(int i = 0; i < NUM; i++)

{

xPoints[i] = i * width / NUM;

yPoints[i] = (int)(height/2*(1-Math.sin(TWOPI * i / NUM)));

}

setVisible(true);

timer = new Timer(200,new ActionListener(){

public void actionPerformed(ActionEvent e)

{

for(int i = 0; i < STEP; i++)

yCopyPoints[i] = yPoints[i];

for(int i = 0; i < NUM-STEP; i++)

yPoints[i] = yPoints[i+STEP];

for(int i = 0; i < STEP; i++)

yPoints[i+NUM-STEP] = yCopyPoints[i];

repaint();

}

});

addComponentListener(new ComponentAdapter() {

public void componentResized(ComponentEvent ce) {

width = getWidth();

height = getHeight();

for(int i = 0; i < NUM; i++)

{

xPoints[i] = i * width / NUM;

yPoints[i] = (int)(height/2*(1-Math.sin(TWOPI * i / NUM)));

}

}

});

timer.start();

}

public void paint(Graphics g)

{

super.paint(g);

g.setColor(Color.red);

g.drawLine(0,height/2,width,height/2);

g.setColor(Color.green);

g.drawPolyline(xPoints,yPoints,NUM);

}

public static void main(String []args)

{

SinWave sw= new SinWave();

sw.setDefaultCloseOperation(EXIT_ON_CLOSE);

}

}

 
 
 
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