Android Open Source - feather-reveal Touch Manager

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License

The source code is released under:

MIT License

Java Source Code

package com.example.test3;
/*from  w ww  .ja  v a 2s .  c  om*/
import android.view.MotionEvent;

public class TouchManager {

  private final int maxNumberOfTouchPoints;

  private final Vector2D[] points;
  private final Vector2D[] previousPoints;

  public TouchManager(final int maxNumberOfTouchPoints) {
    this.maxNumberOfTouchPoints = maxNumberOfTouchPoints;

    points = new Vector2D[maxNumberOfTouchPoints];
    previousPoints = new Vector2D[maxNumberOfTouchPoints];
  }

  public boolean isPressed(int index) {
    return points[index] != null;
  }

  public int getPressCount() {
    int count = 0;
    for(Vector2D point : points) {
      if (point != null)
        ++count;
    }
    return count;
  }

  public Vector2D moveDelta(int index) {

    if (isPressed(index)) {
      Vector2D previous = previousPoints[index] != null ? previousPoints[index] : points[index];
      return Vector2D.subtract(points[index], previous);
    }
    else {
      return new Vector2D();
    }
  }

  private static Vector2D getVector(Vector2D a, Vector2D b) {
    if (a == null || b == null)
      throw new RuntimeException("can't do this on nulls");

    return Vector2D.subtract(b, a);
  }

  public Vector2D getPoint(int index) {
    return points[index] != null ? points[index] : new Vector2D();
  }

  public Vector2D getPreviousPoint(int index) {
    return previousPoints[index] != null ? previousPoints[index] : new Vector2D();
  }

  public Vector2D getVector(int indexA, int indexB) {
    return getVector(points[indexA], points[indexB]);
  }

  public Vector2D getPreviousVector(int indexA, int indexB) {
    if (previousPoints[indexA] == null || previousPoints[indexB] == null)
      return getVector(points[indexA], points[indexB]);
    else
      return getVector(previousPoints[indexA], previousPoints[indexB]);
  }

  public void update(MotionEvent event) {
     int actionCode = event.getAction() & MotionEvent.ACTION_MASK;

     if (actionCode == MotionEvent.ACTION_POINTER_UP || actionCode == MotionEvent.ACTION_UP) {
       int index = event.getAction() >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
       previousPoints[index] = points[index] = null;
     }
     else {
      for(int i = 0; i < maxNumberOfTouchPoints; ++i) {
        if (i < event.getPointerCount()) {
          int index = event.getPointerId(i);

          Vector2D newPoint = new Vector2D(event.getX(i), event.getY(i));

          if (points[index] == null)
            points[index] = newPoint;
          else {
            if (previousPoints[index] != null) {
              previousPoints[index].set(points[index]);
            }
            else {
              previousPoints[index] = new Vector2D(newPoint);

            }

            if (Vector2D.subtract(points[index], newPoint).getLength() < 64)
              points[index].set(newPoint);
          }
        }
        else {
           previousPoints[i] = points[i] = null;
        }
      }
     }
  }
}

Java Source Code List

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