smallCircleX = bigCircleX; smallCircleY = bigCircleY;
} return true; }
弧度计算
通过 event.getX(), event.getY()获得当前的触摸点，与圆点进行计算，获取弧度
/***
- 得到两点之间的弧度 */ public float getRad(float px1, float py1, float px2, float py2) { float x = px2 - px1;
float y = py1 - py2; //斜边的长 float z = (float) Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2)); float cosAngle = x / z; float rad = (float) Math.acos(cosAngle);
if (py2 < py1) { rad = -rad; } return rad; }
图形绘制
通过 canvas.drawCircle()和 canvas.drawBitmap()分别进行遥感按钮和遥感背景的绘制，注意对遥感背景的保存，如果在绘制的时候每次BitmapFactory.decodeResource()会增加耗时，因此只需在surfaceCreated（）中进行bitmap的生成即可。
public void draw() { try { canvas = sfh.lockCanvas(); canvas.drawColor(getResources().getColor(R.color.ghostwhite));
// 指定图片绘制区域(左上角的四分之一) Rect src = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
// 指定图片在屏幕上显示的区域 Rect dst = new Rect(bigCircleX - bigCircleR, bigCircleY - bigCircleR, bigCircleX + bigCircleR, bigCircleY + bigCircleR); // 绘制图片 remoteViewBg.draw(canvas, paint, src, dst); paint.setColor(0x70ff0000); //绘制摇杆 canvas.drawCircle(smallCircleX, smallCircleY, smallCircleR, paint); } catch (Exception e) { // TODO: handle exception } finally { try { if (canvas != null) sfh.unlockCanvasAndPost(canvas); } catch (Exception e2) { e2.printStackTrace(); } } }
使用
在activity中动态添加
RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.id.dance_relative_layout); remoteSurfaceView = new RemoteSurfaceView(this); params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT); remoteSurfaceView.setLayoutParams(params); relativeLayout.addView(remoteSurfaceView);
关键代码
public RemoteSurfaceView(Context context) { super(context); sfh = this.getHolder(); sfh.addCallback(this); paint = new Paint(); paint.setAntiAlias(true); setFocusable(true); setFocusableInTouchMode(true); setZOrderOnTop(true); getHolder().setFormat(PixelFormat.TRANSPARENT);
}
public void surfaceCreated(SurfaceHolder holder) { int width = getWidth(); int height = getHeight(); bigCircleX = width / 2; bigCircleY = height / 2; bigCircleR = width / 4; smallCircleX = width / 2; smallCircleY = height / 2; smallCircleR = width / 8; bitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.fangxiang); remoteViewBg = new RemoteViewBg(bitmap); th = new Thread(this); flag = true; th.start();
}
/***
- 得到两点之间的弧度 */ public float getRad(float px1, float py1, float px2, float py2) { float x = px2 - px1;
float y = py1 - py2; //斜边的长 float z = (float) Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2)); float cosAngle = x / z; float rad = (float) Math.acos(cosAngle);
if (py2 < py1) { rad = -rad; } return rad; }
@Override public boolean onTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() == MotionEvent.ACTION_MOVE) { // 范围外触摸 if (Math.sqrt(Math.pow((bigCircleX - (int) event.getX()), 2) + Math.pow((bigCircleY - (int) event.getY()), 2)) >= bigCircleR) {
double tempRad = getRad(bigCircleX, bigCircleY, event.getX(), event.getY());
getXY(bigCircleX, bigCircleY, bigCircleR, tempRad); } else {//范围内触摸 smallCircleX = (int) event.getX(); smallCircleY = (int) event.getY(); } } else if (event.getAction() == MotionEvent.ACTION_UP) { smallCircleX = bigCircleX; smallCircleY = bigCircleY;
} return true; }
结尾
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