J2ME手机游戏开发技巧(1)

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bgbg = 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); 

}} 

public class BlocksCanvas extends Canvas implements Runnable{ 

private boolean stopFlag=false; 

//调试标志......public void run() 

{//断点位置1testFun(“x:”+x+“y:”+y); 

......//断点位置2testFun(“”);...... 

}private void testFun(String str) 

{ 

stopFlag=true;//画一个白色长方形 

bg.setGrayScale(255); 

bg.fillRect(0,0, fontW, fontH);//在白色长方形上显示str的内容 

bg.setGrayScale(0); 

bg.drawString(str, 0,0, Graphics.TOP 　 Graphics.LEFT); 

repaint(); 

while(stopFlag) 

{}} 

public void keyPressed(int keyCode) 

{ stopFlag=false;} }