comp.java

java编写的打鸟游戏

/*
 * Comp.java
 *
 * Created on 2007年12月18日, 下午12:27
 * 图像中元素的基类，描述可运动物体的基本属性
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package graphics;
import SBGameCore.*;
import java.awt.Image;
import java.awt.Dimension;
import java.awt.*;

/**
 *
 * @author Saerdna
 */
public class Comp {
    GraphicsPanel a;
    int px,py;//new position
    int opx,opy;//old position
    int w,h;//the height and the wide
    int vx,vy;//the speed
    int face;//鸟类飞行方向
    public boolean active = false;//鸟的属性，活or死
    Image img = null;//存放鸟类图片的对象
    /** Creates a new instance of Comp */
    public Comp() {//构造函数为空
    }


    public boolean active(){//鸟置成活鸟
        return active;
    }
    
    public void set_pos(int x,int y){
        px = opx = x;
        py = opy = y;
    }
    
    public void set_speed(int x,int y){
        vx = x;
        vy = y;
    }
    
    public void set_size(int x,int y){
        w = x;
        h = y;
    }
    
    public void set_draw_rectangles(Rectangle o,Rectangle n){//设置绘制区域，包括要擦掉的区域和即将绘制的区域
        int sh = a.window_size.height;
        int x = px - w/2;
        int y = (sh - py) - h/2;
        int ox = opx - w/2;
        int oy = (sh - opy) - h/2;
        o.reshape(ox,oy,w,h);
        n.reshape(x,y,w,h);
        
    }
    
    
    public void active(boolean s){//按照参数设定鸟的状态，死or活
        active = s;
    }
    

    
    public void draw(){//画图方法
        //set the size
        set_draw_rectangles(a.paint_area,a.new_area);
        //设置缓冲区域
        Graphics bg = a.buffer.getGraphics();
        bg.clipRect(a.paint_area.x,a.paint_area.y,w,h);
        bg.drawImage(a.backdrop,0,0,a);
        bg.dispose();
        //fullfill the area
        a.buf_g.fillRect(a.new_area.x,a.new_area.y,w,h);
        //use the new area
        a.paint_area.add(a.new_area);
        //print to the screen
        Graphics g = a.getGraphics();
        g.clipRect(a.paint_area.x,a.paint_area.y,a.paint_area.width,a.paint_area.height);
        g.drawImage(a.buffer,0,0,a);
        g.dispose();  
    }
    
    //the object's erase
    public void erase(){
        set_draw_rectangles(a.paint_area,a.new_area);
        
        a.paint_area.add(a.new_area);
        Graphics bg = a.buffer.getGraphics();
        bg.clipRect(a.paint_area.x,a.paint_area.y,a.paint_area.width,a.paint_area.height);
        bg.drawImage(a.backdrop,0,0,a);
        bg.dispose();
        
        Graphics g = a.getGraphics();
        g.clipRect(a.paint_area.x,a.paint_area.y,a.paint_area.width,a.paint_area.height);
        g.drawImage(a.buffer,0,0,a);
        g.dispose();
    }
}