是男人就下100层【第四层】—

贪吃蛇是一款非常经典的游戏，这些经典游戏给我们的童年添加了不少乐趣，今天開始我们来一步一步的在Android设备上实现一款贪吃蛇游戏，我也是第一次写这个游戏，有可能会写错，或者走弯路，可是终于希望能有一个好的结果，接下来我们一起来一步步的摸着石头开发吧。

一、建立一个project

二、自己定义View（贪吃蛇界面）

package com.example.crazysnake;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.RectF;

import android.util.AttributeSet;

import android.view.View;

public class MySnake extends View {

	private Paint paint;

	private RectF rect;

	public MySnake(Context context, AttributeSet attrs) {

		super(context, attrs);

		paint = new Paint();

		rect = new RectF();

	}

	@Override

	protected void onDraw(Canvas canvas) {

		super.onDraw(canvas);

		rect.set(50, 50, 90, 90);

		paint.setColor(Color.RED);

		canvas.drawRect(rect, paint);

	}

}

布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

	<com.example.crazysnake.MySnake

	    android:layout_width="match_parent"

	    android:layout_height="match_parent"/>

</LinearLayout>

执行效果：

我们在界面上绘制了一个小方块，这个就是我们完毕贪吃蛇的基础（就像我们要盖一座大楼的砖一样重要）

三、画一条彩蛇

先创建一个方块对象

package com.example.crazysnake;

public class Box {

	private int x;

	private int y;

	public Box(int x, int y) {

		super();

		this.x = x;

		this.y = y;

	}

	public int getX() {

		return x;

	}

	public void setX(int x) {

		this.x = x;

	}

	public int getY() {

		return y;

	}

	public void setY(int y) {

		this.y = y;

	}

}

绘制一排方块

package com.example.crazysnake;

import java.util.ArrayList;

import java.util.List;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.RectF;

import android.util.AttributeSet;

import android.view.View;

public class MySnake extends View {

	private Paint paint;

	private RectF rect;

	private int boxSize = 30;

	private List<Box> boxs = new ArrayList<Box>();

	private static final int[] colors = {

		Color.RED,

		Color.BLUE,

		Color.GREEN,

		Color.YELLOW

	};

	public MySnake(Context context, AttributeSet attrs) {

		super(context, attrs);

		paint = new Paint();

		rect = new RectF();

		initData();

	}

	private void initData(){

		Box box;

		for(int i=0; i<10; i++){

			box = new Box(i*boxSize, 0);

			boxs.add(box);

		}

	}

	@Override

	protected void onDraw(Canvas canvas) {

		super.onDraw(canvas);

		for(int i=0; i<boxs.size(); i++){

			paint.setColor(colors[i % colors.length]);

			rect.set(boxs.get(i).getX(), boxs.get(i).getY(), boxs.get(i).getX() + boxSize, boxSize);

			canvas.drawRect(rect, paint);

		}

	}

}

四、让这条彩蛇移动

重写onTouchEvent方法

	@Override

	public boolean onTouchEvent(MotionEvent event) {

		System.out.println("onTouch");

		switch (event.getAction()) {

		case MotionEvent.ACTION_DOWN:

			mDownX = event.getX();

			mDownY = event.getY();

			break;

		case MotionEvent.ACTION_UP:

			float disX = event.getX() - mDownX;

			float disY = event.getY() - mDownY;

			System.out.println("disX = " + disX);

			System.out.println("dixY = " + disY);

			if(Math.abs(disX) > Math.abs(disY)){

				if(disX > 0){

					System.out.println("right");

					move(Derectory.RIGHT);

				}else{

					move(Derectory.LEFT);

				}

			}else{

				if(disY > 0){

				}else{

				}

			}

			break;

		}

		return true;

	}

move方法来依据方向移动

	private void move(Derectory derectory){

		Box box;

		int bs = 0;

		switch (derectory) {

		case LEFT:

		case TOP:

			bs = - boxSize;

			break;

		case RIGHT:

		case BOTTOM:

			bs = boxSize;

			break;

		}

		if(derectory == Derectory.LEFT || derectory == Derectory.RIGHT){

			for(int i=0; i<boxs.size(); i++){

				box = boxs.get(i);

				box.setX(box.getX() + bs);

			}

		}else{

			for(int i=0; i<boxs.size(); i++){

				box = boxs.get(i);

				box.setY(box.getY() + bs);

			}

		}

		invalidate();

	}

上面代码中我们没有控制边界，须要加入推断边界条件的代码。

五、让蛇自己主动跑，我们来控制它

启动一个线程了让蛇自己主动跑

	private class SnakeThread extends Thread{

		private boolean stoped = false;

		@Override

		public void run() {

			while(!stoped){

				try {

					Thread.sleep(1000);

				} catch (InterruptedException e) {

					e.printStackTrace();

				}

				move();

				postInvalidate();

			}

		}

	}

所有代码例如以下：

package com.example.crazysnake;

import java.util.ArrayList;

import java.util.List;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.RectF;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.view.View;

public class MySnake extends View {

	private Paint paint;

	private RectF rect;

	private int boxSize = 30;

	private SnakeThread snakeThread;

	private List<Box> boxs = new ArrayList<Box>();

	private static final int[] colors = {

		Color.RED,

		Color.BLUE,

		Color.GREEN,

		Color.YELLOW

	};

	private enum Derectory{

		LEFT,

		RIGHT,

		TOP,

		BOTTOM;

	}

	private Derectory currentDerect = Derectory.RIGHT;

	public MySnake(Context context, AttributeSet attrs) {

		super(context, attrs);

		paint = new Paint();

		rect = new RectF();

		initData();

		startThread();

	}

	public void startThread(){

		if(snakeThread == null){

			snakeThread = new SnakeThread();

			snakeThread.start();

		}

	}

	private void initData(){

		Box box;

		for(int i=0; i<10; i++){

			box = new Box(i*boxSize, 0);

			boxs.add(box);

		}

	}

	private float mDownX;

	private float mDownY;

	@Override

	public boolean onTouchEvent(MotionEvent event) {

		System.out.println("onTouch");

		switch (event.getAction()) {

		case MotionEvent.ACTION_DOWN:

			mDownX = event.getX();

			mDownY = event.getY();

			break;

		case MotionEvent.ACTION_UP:

			float disX = event.getX() - mDownX;

			float disY = event.getY() - mDownY;

			System.out.println("disX = " + disX);

			System.out.println("dixY = " + disY);

			if(Math.abs(disX) > Math.abs(disY)){

				if(disX > 0){

					currentDerect = Derectory.RIGHT;

				}else{

					currentDerect = Derectory.LEFT;

				}

			}else{

				if(disY > 0){

					currentDerect = Derectory.BOTTOM;

				}else{

					currentDerect = Derectory.TOP;

				}

			}

			break;

		}

		return true;

	}

	private class SnakeThread extends Thread{

		private boolean stoped = false;

		@Override

		public void run() {

			while(!stoped){

				try {

					Thread.sleep(1000);

				} catch (InterruptedException e) {

					e.printStackTrace();

				}

				move();

				postInvalidate();

			}

		}

	}

	private void move(){

		Box box;

		if(boxs.get(0).getX() - boxSize < 0) {

			currentDerect = Derectory.RIGHT;

		}

		if(boxs.get(boxs.size() - 1).getX() + 2 * boxSize > getWidth()){

			currentDerect = Derectory.LEFT;

		}

		switch (currentDerect) {

		case LEFT:

			for(int i=0; i<boxs.size(); i++){

				box = boxs.get(i);

				box.setX(box.getX() - boxSize);

			}

			break;

		case RIGHT:

			for(int i=0; i<boxs.size(); i++){

				box = boxs.get(i);

				box.setX(box.getX() + boxSize);

			}

			break;

		case TOP:

			break;

		case BOTTOM:

			break;

		}

	}

	@Override

	protected void onDraw(Canvas canvas) {

		super.onDraw(canvas);

		for(int i=0; i<boxs.size(); i++){

			paint.setColor(colors[i % colors.length]);

			rect.set(boxs.get(i).getX(), boxs.get(i).getY(), boxs.get(i).getX() + boxSize, boxSize);

			canvas.drawRect(rect, paint);

		}

	}

}

今天先到这里吧，明天继续......^-^

巴特西

是男人就下100层【第四层】——Crazy贪吃蛇（1）

一、建立一个project

二、自己定义View（贪吃蛇界面）

三、画一条彩蛇

四、让这条彩蛇移动

五、让蛇自己主动跑，我们来控制它

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