毕业设计有个远程协助功能,得到对方的屏幕后,老是会闪,很是不爽,今天用java的双缓冲技术解决了。代码如下,本类重写了Swing中的JLabel,当Label重绘时,会默认的调用它的update方法,主要用于清除界面,然后update方法会调用paint方法,再把界面画上去,所以我现在update方法中创建了一个Image和Graphics对象Image off_screen_buf和off_screen_gc同时设置其大小和MyLabel对象的大小一样,用于把要画的东东先绘制到后台内存中,然后调用paint方法把要画的图像画在上面。最后再把内存中的图像画在前台上用off_screen_buf作为参数。再调用repaint方法,repaint方法回默认的调用update方法,这样图像就能够不停的显示了。 public class MyLabel extends JLabel { //双缓冲技术 private Image off_screen_buf; private Graphics off_screen_gc; public void paint(Graphics g) { if(Myjxta.image!=null) { this.setPreferredSize(new Dimension(Myjxta.image.getWidth(),Myjxta.image.getHeight())); g.drawImage(Myjxta.image, 0, 0, this); } try { Thread.sleep(200); } catch(Exception e) { e.printStackTrace(); } } public void update(Graphics g) { if (Myjxta.image != null) { off_screen_buf =this.createImage(this.getWidth(),this.getHeight()); off_screen_gc = off_screen_buf.getGraphics(); paint(off_screen_gc); off_screen_gc.dispose(); g.drawImage(off_screen_buf,0,0,null); this.repaint() ; } } } |
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