?? ufo.java
字號:
import java.awt.Graphics;
/**
* <p>Title: UFO_Play</p>
*
* <p>Description: 基于applet的攻擊UFO的小游戲,定義UFO模型,繼承于Piece</p>
*
* <p>Copyright: Copyright (c) 2007</p>
*
* <p>Company: 鹿児島大學</p>
* @author 柴 智
* @version 1.0
*/
public class UFO extends Piece {
//UFO類的構造函數
public UFO(UFO_Canvas ufo_canvas) {
//UFO屬性值的初始化
super(ufo_canvas);
vx = (Math.random() > 0.5 ? 1 : -1);
vy = -2;
w = 20;
h = 8;
int aw = ufo_canvas.getWindow_size().width;
px = opx = (int) (w / 2 + 1 + (aw - w - 2) * Math.random());
py = opy = ufo_canvas.getWindow_size().height + h / 2 + 1;
active = true;
img = ufo_canvas.getUfostrip();
}
//UFO對象的移動函數
public void move() {
opx = px;
opy = py;
px += vx;
py += vy;
if (py < -h / 2) {
active = false;
}
if ((px <= w / 2) ||
(px >= (ufo_canvas.getWindow_size().width - w / 2)) ||
(Math.random() > 0.96)) {
vx = -vx;
}
}
int seq = 0;
int seq2 = 0;
//UFO對象的繪制函數
public void draw() {
//設置對象的繪制區域
set_draw_rectangles(ufo_canvas.getPaint_area(), ufo_canvas.getNew_area());
// 清除舊的圖像
Graphics bg = ufo_canvas.getBuffer().getGraphics();
bg.clipRect(ufo_canvas.getPaint_area().x, ufo_canvas.getPaint_area().y,
w, h);
bg.drawImage(ufo_canvas.getBackdrop(), 0, 0, ufo_canvas.getBaseApplet());
bg.dispose();
// 由于UFO用的圖片是一個序列圖,要進行剪切再使用
//根據seq2的值選擇相應的部分
if ((++seq2 % 4) == 0) {
seq = ++seq % 4;
}
// 繪制新的區域到緩沖中
bg = ufo_canvas.getBuffer().getGraphics();
bg.clipRect(ufo_canvas.getNew_area().x, ufo_canvas.getNew_area().y, w,
h);
bg.drawImage(img, ufo_canvas.getNew_area().x - w * seq,
ufo_canvas.getNew_area().y, ufo_canvas.getBaseApplet());
bg.dispose();
// 使用新的區域
ufo_canvas.getPaint_area().add(ufo_canvas.getNew_area());
// 將緩沖繪制到屏幕上
Graphics g = ufo_canvas.getBaseApplet().getGraphics();
g.clipRect(ufo_canvas.getPaint_area().x, ufo_canvas.getPaint_area().y,
ufo_canvas.getPaint_area().width,
ufo_canvas.getPaint_area().height);
g.drawImage(ufo_canvas.getBuffer(), 0, 0, ufo_canvas.getBaseApplet());
g.dispose();
}
}
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