/* * Bird.java * * Created on 2007年12月19日, 上午11:41 * * To change this template, choose Tools | Template Manager * and open the template in the editor. *實現了鳥類的移動（在move方法實現） *當鳥類飛出界面或者被擊中后掉落到屏幕外，調用reset方法重新刷出一只鳥 *draw函數重載了父類里面的draw方法，實現了圖像的刷新 */package graphics;import SBGameCore.*;import java.awt.Point;import java.util.Random;import java.awt.Graphics;/** * * @author Saerdna */public class Bird extends Comp{    int[] randomYSpeed = new int[]{2,-1,0,-2,1};//{0,0,0,0,0};//Y方向的速度數組    int[] randomXSpeed = new int[]{2,5,9};//{0,0,0};//X方向的速度數組    public static boolean[] pathUsed = new boolean[]{false,false,false,false,false,false,false};    int[] randomPosition = new int[]{60,150,240,330,420,510,600};//出現的路徑的數組，把Y軸分成7個區域    int num;//保存鳥類圖片的序號    int pathID;//保存選擇的路徑的序號    /**     * Creates a new instance of Bird     */    public Bird(GraphicsPanel a) {        this.a = a;        w = 100;//圖片的寬度        h = 100;//圖片的高度                Random rbird = new Random();//創建一個隨機數對象        int b = 0;        //do{        b = rbird.nextInt(7);//0~6這個整數數組中隨機抽取一個數        img = a.birds[b];//按照這個隨機數選擇一只鳥        num = b;//保存鳥的序號                if(b == 1 || b == 3){//如果是1號或者3號鳥，讓他從左邊飛出            do{                pathID = rbird.nextInt(7);//0~6這個整數數組中隨機抽取一個數            }while(pathUsed[pathID]);            px = opx =  0;            py = opy =  randomPosition[pathID];//按照這個隨機數選擇一條路徑            pathUsed[pathID] = true;            face = 1;//代表從左向右飛                    }else{//如果是其他編號的鳥，讓它從右邊飛出            do{                pathID = rbird.nextInt(7);            }while(pathUsed[pathID]);            px = opx =  1000;            py = opy =  randomPosition[pathID];            pathUsed[pathID] = true;            face = -1;//代表從右向左飛                    }                Random rndv = new Random();        int x = 0;        x = rndv.nextInt(3);        vx = randomXSpeed[x];//按照身成的隨機數，從x方向速度的數組中抽取一個飛行速度                active = true;//鳥是活鳥                //k = (k+1)%7;     /*   Random rndv = new Random();          int x = 0;        x = rndv.nextInt(3);         vx = randomv[x];        try {Thread.sleep(100);} catch(Exception e) {};         int y = rndv.nextInt(3);         vy = randomv[y];*/    }        public void move() {        if(active){//如果是活鳥，就按照下述方法飛行            opx = px;            opy = py;            px = px + vx * face;//vx*face，判別x的方向                        Random rnd = new Random();            int x = 0;            x = rnd.nextInt(5);            py = randomYSpeed[x] + py;//按照隨機生成的隨機數，決定下一步y軸的飛行方向            if(face == 1&&px == 1100)//如果左邊的鳥飛出右邊邊界                px=0;            else if(face == -1 && px == -100)//如果右邊的鳥飛出左邊邊界                px = 1000;        }else{            die();//如果是死鳥，就按照die方法進行飛行        }    }            public void draw(){        set_draw_rectangles(a.paint_area,a.new_area);        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();                bg = a.buffer.getGraphics();        bg.clipRect(a.new_area.x,a.new_area.y,w,h);        bg.drawImage(img,a.new_area.x,a.new_area.y,a);        bg.dispose();                a.paint_area.add(a.new_area);                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();    }    public Point getPoint(){//得到鳥的當前所在的坐標        return new Point(px,py);    }        public void reset(){//重置鳥類的飛行屬性，類似構造方法中的操作        active = true;//讓死鳥變活，以下同構造函數中的描述        Random rbird = new Random();        int b = 0;        b = rbird.nextInt(7);        num = b;        img = a.birds[b];        if(num == 1 || num == 3){            px = opx =  0;            py = opy =  randomPosition[pathID];            face = 1;        }else{            px = opx =  1000;            py = opy =  randomPosition[pathID];            face = -1;        }                Random rndv = new Random();        int x = 0;        x = rndv.nextInt(3);        vx = randomXSpeed[x];            }    public void die(){//死鳥的飛行方法        opx = px;        opy = py;        py = py - 10;//讓他垂直下落        if(py < -100 )            reset();//當掉出屏幕外，重置    }    public void changeToDeadImage(){//當活鳥被擊中后，更換圖片        img = a.deadbirds[num];    }    public int getScore(){//返回得分        return vx*2;    }    public int getFace(){//返回鳥類飛行方向        return face;    }    }