6.5.2 图片切割法

/×
图片切割状态显示
×/
import javax.microedition.midlet.×;
import javax.microedition.lcdui.×;
import java.util.Random;
public class canvasDemo6 extends MIDlet
{
Display display;
canvasClip canvasclip;
public canvasDemo6()
{
canvasclip=new canvasClip();
display=Display.getDisplay(this);
}
public void startApp()
{
display.setCurrent(canvasclip);
}
public void pauseApp(){}
public void destroyApp(boolean unconditional){}
class canvasClip extends Canvas 
{
int     gameaction=0;
int     x=0;
int     y=0;
int     width;
int     height;
Image  pictureImage;
Random viewRand;
public canvasClip()
{
try{
pictureImage=Image.createImage("/picture.png");
}catch(Exception ex){}
}

public void keyPressed(int keyCode) 
{
gameaction=getGameAction(keyCode);
viewRand=new Random();
x=(int)Math.abs(viewRand.nextInt()%60);
y=(int)Math.abs(viewRand.nextInt()%60);
switch(gameaction)
{
case FIRE:
repaint();                 
break;
}
}
public void paint(Graphics g)
{ 
g.setColor(0xFFFFFF);
g.fillRect(0,0,getWidth(),getHeight());
g.setColor(0);
//设置切割区域
g.setClip(30, 60, x, y);
//取得切割画面的宽度
width=g.getClipWidth();
//取得切割画面的高度
height=g.getClipHeight();
g.drawImage(pictureImage, 30, 60, Graphics.LEFT | Graphics.TOP);
//将切割后的动作应用到全屏幕画面
g.setClip(0, 0, getWidth(), getHeight());
g.drawString("宽度:"+width, 50, 10, Graphics.HCENTER | Graphics. TOP);
g.drawString("高度:"+height, 50, 30, Graphics.HCENTER | Graphics. TOP);
//进行矩形切割
g.clipRect(100, 60, x, y);
//取得切割画面的矩形宽度
width=g.getClipWidth();
//取得切割画面的矩形宽度
height=g.getClipHeight();
g.drawImage(pictureImage, 100, 60, Graphics.LEFT | Graphics.TOP);
//将切割后的动作应用到全屏幕画面
g.setClip(0, 0, getWidth(), getHeight());
g.drawString("矩形宽度:"+width, 120, 10, Graphics.HCENTER | Graphics.TOP);
g.drawString("矩形高度:"+height, 120, 30, Graphics.HCENTER | Graphics.TOP); 
g.drawRect(100, 60, x, y);
}
}
}