MotionEvent coordinates to Scene coordinates

Question

I am developing an application using multi-touch in AndEngine. To get the coordinates of touching fingers I use pSceneTouchEvent.getMotionEvent().getX([pointer index]) because TouchEvent doesn't have an equivalent getter, only pSceneTouchEvent.getX().

The problem is that MotionEvent returns coordinates on the screen while TouchEvent returns coordinates on the Scene. When I zoom in or out, the screen and Scene coordinates do not match, so I need to convert the screen coordinates to Scene coordinates. How can I do that?

Answer 1

Solution found. Andengine handles touch events in a different way to Android so there is no history of touch coordinates. I simply store them myself in private variables before handling the event:

if (pSceneTouchEvent.getPointerID() == 0) {
    pointer0LastX = pSceneTouchEvent.getX();
    pointer0LastY = pSceneTouchEvent.getY();
}
if (pSceneTouchEvent.getPointerID() == 1) {
    pointer1LastX = pSceneTouchEvent.getX();
    pointer1LastY = pSceneTouchEvent.getY();
}

Then I just access these instead of getting the values from the TouchEvent.