pointermotiondemo.java

来自「J2ME手机游戏开发技术详解随书光盘」· Java 代码 · 共 61 行

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class PointerMotionDemo extends MIDlet {
    Display display;
    PointerCanvas pc;
    boolean isPointed = false;
    public PointerMotionDemo() {
        display = Display.getDisplay(this);
        pc= new PointerCanvas();
    }
    public void startApp () {
        display.setCurrent(pc);
    }
    public void pauseApp() {
    }
    public void destroyApp (boolean unconditional) {
        pc=null;
        display=null;
    }
    class PointerCanvas extends Canvas {
        int width = this.getWidth();
        int height = this.getHeight();
        int  x,y;
        boolean firsttime = true;
        public PointerCanvas() {

            System.out.println(hasPointerEvents()); 
            System.out.println(hasPointerMotionEvents());
        }
        protected void paint(Graphics g) {
            if(firsttime){
            g.setColor(0xFFFFFF);
            g.fillRect(0, 0, width, height);
            g.setColor(0x000000);
            firsttime = false;
            }
           if(isPointed){
           g.setColor(0x000000);
           g.drawRect(x,y,0,0);
           isPointed = false;
           }
        }
        protected void pointerPressed(int x, int y) {
            this.x = x;
            this.y = y;
            isPointed = true;
            repaint();
        }
        protected void pointerDragged(int x, int y){
            pointerPressed(x, y);
        }
        protected void pointerReleased(int x, int y){

        
        }
        
    }
   
     
}