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RSS订阅在画面上计算四象限射击角度
在画面上计算四象限射击角度，用手点击不同的射机角度进行改变
public float getAngle(float px1, float py1) {
float _pointX = px1 - originX;
float _pointY = py1 - originY;
float sin = (float) Math.sqrt(Math.pow(_pointY, 2))
/ (float) Math
.sqrt(Math.pow(_pointX, 2) + Math.pow(_pointY, 2));
// float tan = (_pointY-originY)/(_pointX-originX);
angle = (float) Math.asin(sin);
if (_pointX > 0 && _pointY > 0) {
} else if (_pointX 0) {
angle = (float) Math.PI - angle;
} else if (_pointX < 0 && _pointY 0 && _pointY < 0) {
angle = 2 * (float) Math.PI - angle;
}
return (angle / (float) (Math.PI)) * 180;
}
2012-02-23
画布上显示的控件
package com.vai;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.SurfaceHolder.Callback;
/**
*
* @author Himi
*
*/
public class MySurfaceView extends SurfaceView implements Callback, Runnable {
public MySurfaceView(Context context, AttributeSet attrs) {
super(context, attrs);
sfh = this.getHolder();
sfh.addCallback(this);
paint = new Paint();
paint.setColor(Color.WHITE);
paint.setAntiAlias(true);
setFocusable(true);
}
private SurfaceHolder sfh;
private Paint paint;
private Thread th;
private boolean flag;
private Canvas canvas;
private int screenW, screenH;
//
/**
* SurfaceView初始化函数
*/
/**
* SurfaceView视图创建，响应此函数
*/
@Override
public void surfaceCreated(SurfaceHolder holder) {
screenW = this.getWidth();
screenH = this.getHeight();
flag = true;
//实例线程
th = new Thread(this);
//启动线程
th.start();
}
/**
* 游戏绘图
*/
public void myDraw() {
try {
canvas = sfh.lockCanvas();
if (canvas != null) {
canvas.drawColor(Color.BLACK);
paint.setTextSize(15);
canvas.drawText("这里是游戏视图-SurfaceView", 40, 40, paint);
}
} catch (Exception e) {
// TODO: handle exception
} finally {
if (canvas != null)
sfh.unlockCanvasAndPost(canvas);
}
}
/**
* 触屏事件监听
*/
@Override
public boolean onTouchEvent(MotionEvent event) {
return true;
}
/**
* 按键事件监听
*/
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
return super.onKeyDown(keyCode, event);
}
/**
* 游戏逻辑
*/
private void logic() {
}
@Override
public void run() {
while (flag) {
long start = System.currentTimeMillis();
myDraw();
logic();
long end = System.currentTimeMillis();
try {
if (end - start < 50) {
Thread.sleep(50 - (end - start));
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
/**
* SurfaceView视图状态发生改变，响应此函数
*/
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
/**
* SurfaceView视图消亡时，响应此函数
*/
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
flag = false;
}
}
2012-02-23
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