GameCanvas 双缓冲

[ice_wating]

package com.dog;
import java.io.IOException;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.game.GameCanvas;


public class Story extends GameCanvas implements Runnable{
BombRen br;
Image story;
int x,y,storyWidth,storyHeight;
Graphics outG;
boolean flag;
byte a = Graphics.LEFT|Graphics.TOP;
public Story(BombRen brIn){
super(false);
flag = true;
x = 0;
y = 320;
br = brIn;
try {
story = Image.createImage("/sister.png");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
new Thread(this).start();
}
//public void paint(Graphics g) {
//g.drawImage(story, x,y, a);

//}

public void run() {
while(flag){
y=y-1;
outG = this.getGraphics();
outG.drawImage(story, x, y, a);
this.flushGraphics();
//repaint();
try{Thread.sleep(100);}
catch(InterruptedException e ){
e.printStackTrace();
}

}

}


}

我已经用了getGraphics ,flushGraphics这两个方法，可是为什么画出来的动画还是有重影呢。

[麦田捕手]

每次绘制之前没有清屏

		g.setColor(0xffffff);
		g.fillRect(0, 0, this.getWidth(), this.getHeight());

[runer]

flushGraphics()之前先清除上次的图像就ok了

[ice_wating]

还是不太懂，我把g.setColor(0xffffff);
g.fillRect(0, 0, this.getWidth(), this.getHeight());
放在了flushiGraphics()前，可是好时会有重影，而且画面闪得非常厉害

[sihonglaoren]

每次绘制之前没有清屏

g.setColor(0xffffff);
g.fillRect(0, 0, this.getWidth(), this.getHeight());

[ice_wating]

很感谢2,3楼，改的时候搞错了，应该是
outG.setColor(0xffffff);
outG.fillRect(0, 0, this.getWidth(), this.getHeight());
而不是
g.setColor(0xffffff);
g.fillRect(0, 0, this.getWidth(), this.getHeight());