Beispiel #1
0
 @Override
 public boolean onScale(ScaleGestureDetector detector) {
   float xScale = ((float) detector.getCurrentSpanX()) / detector.getPreviousSpanX();
   yAmplifier *= (((float) detector.getCurrentSpanY()) / detector.getPreviousSpanY());
   yAmplifier = Math.max(Math.min(yAmplifier, MAX_YAMP), MIN_YAMP);
   shownDataAmount /= xScale;
   shownDataAmount = Math.min(Math.max(1, (shownDataAmount)), MAXSAMPLEPACKETS);
   return true;
 }
 @Override
 public boolean onScale(ScaleGestureDetector scaleGestureDetector) {
   float spanX =
       scaleGestureDetector.getCurrentSpanX() - scaleGestureDetector.getPreviousSpanX();
   float spanY =
       scaleGestureDetector.getCurrentSpanY() - scaleGestureDetector.getPreviousSpanY();
   LayoutParams lParams = (LayoutParams) getLayoutParams();
   float newWidth = lParams.width + spanX;
   float newHeight = lParams.height + spanY;
   lParams.width = (int) newWidth;
   lParams.height = (int) newHeight;
   setLayoutParams(lParams);
   Log.i("spanX", spanX + "");
   Log.i("spanY", spanY + "");
   return true;
 }
  //// TODO: 16/12/15 Still get better method to judge the rotate gesture
  private boolean judgeRotate(ScaleGestureDetector detector) {
    boolean res = false;

    double preDistX = detector.getPreviousSpanX();
    double preDistY = detector.getPreviousSpanY();
    double curDistX = detector.getCurrentSpanX();
    double curDistY = detector.getCurrentSpanY();

    double atanPre = Math.atan2(preDistY, preDistX);
    double atanCur = Math.atan2(curDistY, curDistX);
    rotate = atanCur - atanPre;

    if (Math.abs(rotate) > ROTATE_THRESHOLD) {
      res = true;
      gestureName = GESTURE_ROTATE;
      focus_x = detector.getFocusX();
      focus_y = detector.getFocusY();
      gestureLabel.setText(
          gestureName + "\n x:" + focus_x + " y:" + focus_y + "\ndeltaAngel:" + rotate);
    }
    return res;
  }