Java实现风车旋转的效果.docx

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1、Java实现风车旋转的效果packagecom.mingrui.graphicstest;importjava.awt.Color;importjava.awt.Graphics;importjava.util.Timer;importjava.util.TimerTask;importjavax.swing.*;publicclassMyJPanel2extendsJPanel{ privateTimertimer=newTimer(); privateintangle=0; publicvoidpaintComponent(Graphicsg){ 

2、 timer.schedule(newTimerTask(){   @Override   publicvoidrun(){    //TODOAuto-generatedmethodstub    angle+=20;    repaint();   }     },50);  super.paintComponent(g);  intxCenter=getWidth()/2;  intyCenter=getHeight()/2;  intraidus=(int)(Math.min(xCenter,yCenter)*0.4*2);  g.fillAr

3、c((int)(getWidth()*0.1),(int)(getHeight()*0.1),raidus*2,raidus*2,angle,30);  g.setColor(Color.green);  g.fillArc((int)(getWidth()*0.1),(int)(getHeight()*0.1),raidus*2,raidus*2,angle+90,30);  g.setColor(Color.red);  g.fillArc((int)(getWidth()*0.1),(int)(getHeight()*0.1),raidus*2,

4、raidus*2,angle+180,30);  g.setColor(Color.blue);  g.fillArc((int)(getWidth()*0.1),(int)(getHeight()*0.1),raidus*2,raidus*2,angle+270,30); }}packagecom.mingrui.graphicstest;importjavax.swing.*;publicclassTest15_4extendsJFrame{ /** *@paramargs */ Test15_4(){  setSize(270,340);  se

5、tResizable(false);  setLocationRelativeTo(null);  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  add(newMyJPanel2());  setVisible(true); } publicstaticvoidmain(String[]args){  //TODOAuto-generatedmethodstub  newTest15_4(); }}timer和timertask真的很好用，尤其是在时钟，或者此类圆的旋转应用上