Gaming Tricks for Phones or Tablets - Pro Android Games - page 49

Listing 2-9. MultiTouchScreen
package com.touch;
import java.util.ArrayList;
import android.graphics.Point;
import android.view.MotionEvent;
public class MultiTouchScreen {
private ArrayList<MultiTouchGesture> mGestures;
/**
* Constructor
* @param gestures
*/
public MultiTouchScreen(ArrayList<MultiTouchGesture> gestures) {
mGestures = gestures;
}
/**
* Touch Event. Events with bogus pressure pop up when using 1 finger
* @param e
*/
public void onTouchEvent(MotionEvent e) {
final int action = e.getAction();
int count = e.getPointerCount();
Point[] points = new Point[count];
// for each finger extract coords
for (int i = 0; i < points.length; i++) {
points[i] = new Point((int) e.getX(i), (int) e.getY(i));
}
// for each gesture
for (MultiTouchGesture g : mGestures) {
// for each finger (pointer)
for (int j = 0; j < count; j++) {
if (g.bounds.contains(points[j].x, points[j].y)) {
g.execute(action, points[j]);
}
}
}
// reset when finger goes up
if (action == MotionEvent.ACTION_UP) {
for (MultiTouchGesture g : mGestures) {
g.reset();
}
}
}
}