飞机大战游戏详解
1.整体实现思路
首先，我们看到飞机大战游戏，它的背景是滚动的，而且是循环滚动的，所以，首先我们要先实现背景的滚动，然后再去添加飞机、boss、子弹等东西。背景滚动做完后，就要添加飞机进去了，而且要使飞机在屏幕的底端并且居中。做完这个后，那么boss的位置就和飞机的类似，在屏幕顶端居中就可以了，但是设置boss的位置有一个难点，因为一张图片上有好几个boss的图片，所以就要用到clipRect的功能。然后就要给飞机和boss添加子弹了，可以把子弹放在飞机的两翼发射，也可以放在头部发射，这要用到简单的数学方法。这些基本的做完之后，为了使游戏有意思，我们加入了飞机碰到boss子弹或者身体时有短暂的无敌状态，这段时间里碰到子弹也不受伤害，boss每隔一段时间会出现“疯狂模式”，就是boss的身体猛地向下移动。接着我们给游戏加入了爆炸效果和音效，玩起来才没有那么单调。然后设置了游戏结束的画面，“you win”和“you lost”。最后给游戏加入开始游戏和退出游戏的菜单界面，这样一个简单的飞机大战游戏便实现了。
2.如何绘制循环滚动的背景图片？
package com.example.lenovo.myapplication;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
public class BackGround {
private int y1;
private int y2;
private Bitmap bitmap;
public BackGround(Bitmap bitmap){
this.bitmap = bitmap;
y1=0;
y2=y1-bitmap.getHeight();
}
public void draw(Canvas canvas,Paint paint){
logic();
canvas.drawBitmap(bitmap,0,y1,paint);
canvas.drawBitmap(bitmap,0,y2,paint);
}
public void logic() {
y1+=10;
y2+=10;
if (y1>=MySurfaceView.height){
y1=y2-bitmap.getHeight();//移动到第二张图片的顶部
}
if (y2>=MySurfaceView.height){
y2=y1-bitmap.getHeight();
}
}
}3.如何绘制飞机？
package com.example.lenovo.myapplication;
import android.content.Context;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback,Runnable{
private SurfaceHolder surfaceHolder;
private Canvas canvas;//绘制图形的画布
private boolean isDrawing = true;//标志位
public static int height;
public MySurfaceView(Context context) {
super(context);
init();
}
/*
初始化操作
*/
private void init(){
surfaceHolder = getHolder();
surfaceHolder.addCallback(this);//添加回调事件监听
setFocusable(true);
setKeepScreenOn(true);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
new Thread(this).start();//启动子线程
height = getHeight();//把getHeight(获取height的方法)的返回值赋给height
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
isDrawing = false;
}
@Override
public void run() {
BackGround backGround = new BackGround(BitmapFactory.decodeResource(getResources(),R.mipmap.bk));
while (isDrawing) {
canvas = surfaceHolder.lockCanvas();//锁定（选定）画布
canvas.drawColor(Color.WHITE);
backGround.draw(canvas);
surfaceHolder.unlockCanvasAndPost(canvas);//解锁画布，显示到屏幕上
}
}
}4.如何绘制子弹？
package com.example.lenovo.myapplication;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
public class Bullet {
private Bitmap bitmap;
private int x,y;
private int speed = 10;
private boolean isDead;
public Bullet(Bitmap bitmap, int x, int y){
this.bitmap = bitmap;
this.x = x;
this.y = y;
}
public void draw(Canvas canvas, Paint paint){
canvas.drawBitmap(bitmap,x,y,paint);
logic();
}
private void logic() {
y-=speed;
if(y<0){
isDead = true;
}
}
public boolean isDead() {
return isDead;
}
}5.如何判断碰撞？
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.view.MotionEvent;
public class Myplane {
private Bitmap bitmap;
private Bitmap bitmapHp;
private int x,y;
private int width,height;
private boolean noCollision;
private int noCollisionCount;
private int hp = 3;
public Myplane(Bitmap bitmap, Bitmap bitmapHp){
this.bitmap = bitmap;
this.bitmapHp = bitmapHp;
x = MySurfaceView.width/2-bitmap.getWidth()/2;
y = MySurfaceView.height-bitmap.getHeight();
width = bitmap.getWidth();
height = bitmap.getHeight();
}
public void draw(Canvas canvas,Paint paint){
if (noCollision){
noCollisionCount++;
if (noCollisionCount%10==0){
canvas.drawBitmap(bitmap,x,y,paint);//飞机闪烁
}
if (noCollisionCount>100){//无敌时间
noCollision = false;
noCollisionCount = 0;
}
}else {
//非无敌状态
canvas.drawBitmap(bitmap,x,y,paint);
}
for (int i = 0; ix&&exy&&eyMySurfaceView.height){
y=MySurfaceView.height-height;
}
}
}
}
public boolean isCollision(Bullet bullet){
if (noCollision){
return false;
}else{
if (bullet.getX()>x&&bullet.getX()y&&bullet.getY()0){
hp--;
}
return true;
}
}
return false;
}
public int getX() {
return x;
}
public int getY() {
return y;
}
public int getWidth() {
return width;
}
} import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
public class BossPlane {
private Bitmap bitmap;
private int x,y;
private int frameW,frameH;
private int speed=5;
private int crazySpeed=50;
private int count;//计数器
private int time=300;//疯狂模式间隔
private boolean isCrazy;
public BossPlane(Bitmap bitmap) {
this.bitmap = bitmap;
this.frameW = bitmap.getWidth()/10;
this.frameH = bitmap.getHeight();
x=MySurfaceView.width/2-frameH/2;
}
public void draw(Canvas canvas, Paint paint){
canvas.save();
canvas.clipRect(x,y,x+frameW,y+frameH);
canvas.drawBitmap(bitmap,x,y,paint);
canvas.restore();
logic();
}
public void logic(){
count++;
if (isCrazy){
y = y+crazySpeed;
crazySpeed--;
if (y==0){
isCrazy = false;
crazySpeed = 50;
}
}else {
if (count%time==0){
isCrazy=true;
}
x = x+speed;
if (x>MySurfaceView.width-frameH){
speed = -speed;
}
if (x<0){
speed = -speed;
}
}
}
public int getX() {
return x;
}
public int getY() {
return y;
}
public int getFrameW() {
return frameW;
}
public int getFrameH() {
return frameH;
}
} import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
public class Bullet {
private Bitmap bitmap;
private int x, y;
private int speed = 10;
private boolean isDead;
private int type;
public Bullet(Bitmap bitmap, int x, int y,int type) {
this.bitmap = bitmap;
this.x = x;
this.y = y;
this.type = type;
}
public void draw(Canvas canvas, Paint paint) {
canvas.drawBitmap(bitmap, x, y, paint);
logic();
}
public void logic() {
switch (type){
//玩家子弹
case 0:
y -= speed;
if (y < 0) {
isDead = true;
}
break;
//Boss子弹
case 1:
y += speed+5;
if (y < 0) {
isDead = true;
}
break;
default:
break;
}
}
public boolean isDead() {
return isDead;
}
public int getX(){
return x;
}
public int getY() {
return y;
}
} 6.如何绘制爆炸效果？
package com.example.luwei.smile;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
public class Boom extends Bullet {
private Bitmap bitmap;
private int x,y;
private int totalFrame;
private int currentFrame;
private int frameW,frameH;
private boolean isEnd;
public Boom(Bitmap bitmap, int x, int y, int totalFrame) {
super();
this.bitmap = bitmap;
this.x = x;
this.y = y;
this.totalFrame = totalFrame;
frameW = bitmap.getWidth()/totalFrame;
frameH = bitmap.getHeight();
}
public void draw(Canvas canvas, Paint paint){
canvas.save();
canvas.clipRect(x,y,x+frameW,y+frameH);
canvas.drawBitmap(bitmap,x-currentFrame*frameW,y,paint);
canvas.restore();
logic();
}
public void logic(){
if (currentFrame7.如何添加音效？
package com.example.luwei.smile;
import android.content.Context;
import android.media.AudioManager;
import android.media.SoundPool;
public class GameSoundPool {
private SoundPool soundPool;
private int s1;
private int s2;
private int s3;
public GameSoundPool(Context context){
this.soundPool = new SoundPool(2, AudioManager.STREAM_MUSIC,0);
s1 = soundPool.load(context,R.raw.shoot,1);
s2 = soundPool.load(context,R.raw.explosion2,1);
s3 = soundPool.load(context,R.raw.bgm_zhandou2,1);
}
public void playSound(int s) {
switch (s){
case 1:
soundPool.play(s1,1,1,1,1,1.0f);
break;
case 2:
soundPool.play(s2,1,1,1,1,1.0f);
break;
case 3:
soundPool.play(s3,1,1,1,1,1.0f);
break;
}
}
}
8.哪些地方用到封装、继承、多态、方法重载、接口等
封装：
public static int GAME_STATE = 0;
private SurfaceHolder surfaceHolder;
private Canvas canvas;//绘制图形的画布
private boolean isDrawing = true;//标志位
public static int height;
public static int width;
private Myplane plane;
private Vector
private Vector
private Vector
private int count;
private GameSoundPool gameSoundPool;
继承：
public class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback,Runnable {
}
多态：
public boolean isCollision(Bullet bullet){
if(bullet.getX()>x&&bullet.getX()+bullet.getBitmap().getWidth()
bullet.setDead(true);
if (bossHp<0){
MySurfaceView.GAME_STATE = 1;
}
return true;
}
return false;
}
public boolean isCollision(Bullet bullet){
if (noCollision){
return false;
}else{
if (bullet.getX()>x&&bullet.getX()
if (hp>0){
hp--;
}
return true;
}
}
return false;
}
方法重载：
public boolean isCollision(Bullet bullet){}
public boolean isCollision(BossPlane bossPlane) {}
9.我的收获与感悟
通过这4个星期的学习，学习和生活上都有了很多收获。在生活中我们要自信，不能随随便便否定自己，每个人都有无限的可能性。要多看，多思考，光看还不够，思考才是最重要的。要多看书，书籍是人类进步的阶梯，书中的知识能对我们的人生产生很大的影响。还要养成独立思考的习惯。学习上，从一开始的基本概念都不懂，到现在的基础知识基本能够掌握了，只要肯下功夫，每天复习所学知识点，那么时间长了自然就记住了，而且不容易忘。在写代码方面还差的很远，一定要继续努力！向班里优秀的同学学习、请教，不断地增长知识。
做任何一件事，都贵在坚持，“靡不有初，鲜克有终”，在每一件事情开始的时候我们都信心十足，活力满满，所以很多事情的开端和前景都是美好的。但是，每一件事情都不可能是一帆风顺的，有时我们的热情与初心便被困难磨没了，失去了热情与激情，也就没有美好的结果。做人善始善终，才能把握机遇。人都说，机遇都是留给有准备的人，但我想说，机遇是留给能坚持下去的人。如果一个人只有三分钟热度，那他一定找不到成功的钥匙。因为他找不到通往成功的机遇。只有善始善终的人，才能发现机遇并运用机遇。为自己的成功创造可能。