public class BlocksCanvas extends Canvas implements Runnable

{

Graphics bg;

Image buf;

public BlocksCanvas()

{

......

height = getHeight();

width = getWidth();

//按屏幕大小建立缓冲对象

buf = Image.createImage(width, height);

//将缓冲对象的Graphics附给bg

bg = buf.getGraphics();

......

}    

public void run()

{......

for(i=0;i
{

for(j=0;j
{//画方块

drawBlock(x,y);

}

}

repaint();

}

private void drawBlock(int block_x, int block_y)

{   

//取得方块的坐标

int x = getLeft(block_x);

int y = getTop(block_y);

//取得方块的颜色

int c= board[block_x][block_y];   

bg.drawImage(imgs[c], x, y, Graphics.TOP | Graphics.LEFT);

}

public void paint(Graphics g)

{

g.drawImage(buf, 0, 0, Graphics.TOP | Graphics.LEFT);

}

}