j2me源程序--空战游戏

package shoot; import java.util.Vector; import javax.microedition.lcdui.Image; public class EnemyPlane extends GameObject { private MainGame mg; private Image image; private int[][] MoveSpeeds = { { 0, -3 }, { 1, -2 }, { 2, -2 }, { 2, -1 }, { 3, 0 }, { 2, 1 }, { 2, 2 }, { 1, 2 }, { 0, 3 }, { -2, 1 }, { -2, 2 }, { -1, 2 }, { -3, 0 }, { -2, -1 }, { -2, -2 }, { -1, -2 } };//16个飞行方向的移动速度 private Vector enemyPlane; public EnemyPlane(MainGame mg) { this.mg = mg; enemyPlane = new Vector(); image = Tools.getImg("/shoot/yelplane.png"); width = 30; height = 28; } public void newEnemyPlane() { int[] temp = new int[3]; x = Tools.randData(-width, Tools.WIDTH);//随机获取飞机出现的X轴坐标 if (x < 0) {//飞机的屏幕的右边出现的时候 y = Tools.randData(0, Tools.HEIGHT);//随机获取飞机出现的X轴坐标 } else {//在屏幕的上边缘出现 y = -height; } temp[0] = x; temp[1] = y; temp[2] = Tools.randData(0, 15); enemyPlane.addElement(temp); } public boolean isHitWith(int x1, int y1, int width1, int height1, int x2, int y2, int width2, int height2) {//飞机的碰撞检测 区域检测 return x1 + width1 > x2 && x1 < x2 + width2 && y1 + height1 > y2 && y1 < y2 + height2; } public void hitBullet() {//判断飞机与子弹的碰撞 int[] temp; for (int i = 0; i < enemyPlane.size(); i++) { temp = (int[]) enemyPlane.elementAt(i); x = temp[0]; y = temp[1]; for (int j = 0; j < mg.bullet.allBullet.size(); j++) { temp = (int[]) mg.bullet.allBullet.elementAt(j); if (isHitWith(x, y, width, height, temp[0], temp[1], mg.bullet.width, mg.bullet.height)) { enemyPlane.removeElementAt(i); break; } } } } public void update() {//敌军飞机的更新 int[] temp; for (int i = 0; i < enemyPlane.size(); i++) { temp = (int[]) enemyPlane.elementAt(i); temp[0] += MoveSpeeds[temp[2]][0];//移动飞机的位置 temp[1] += MoveSpeeds[temp[2]][1]; Tools.drawClip(mg.offG, image, temp[0], temp[1], temp[2] * width, 0, width, height);//绘制飞机 if (!onScreen(temp[0], temp[1])) { enemyPlane.removeElementAt(i); continue; } x = temp[0]; y = temp[1]; for (int j = 0; j < mg.bullet.allBullet.size(); j++) {//判断时候与子弹碰撞 temp = (int[]) mg.bullet.allBullet.elementAt(j); if (isHitWith(x, y, width, height, temp[0], temp[1], mg.bullet.width, mg.bullet.height)) {//出现碰撞 enemyPlane.removeElementAt(i);//移除飞机 mg.bullet.allBullet.removeElementAt(j);//移除子弹 mg.explode.newExplode(x, y);//产生爆炸效果 break; } } } if (enemyPlane.size() < 5 && Tools.randData(0, 100) > 60) {//产生新的飞机 newEnemyPlane(); } } }