swipe motion (left - right - up - down) ??

I would like to add swipe motion in my game to move the camera forward, backward, left, or right .. depending on the swipe motion.

How can this be coded. Pseudo code is welcomed ... or if you're generous full code snippet

My guess is that I listen for touchBegin and grab the touchPosition ... then listen for touchEnd and grab that touchPosition.

From there calculate the distance from touchBeginPosition to touchEndPosition on the X and Y axis. If the distance on either axis is greater than a value that I set in the editor... I consider that gesture as a swipe.

After determining if the gesture is swipe (lets say on the Y axis) I can do:

Code (csharp):

1.  
2. if(touchBeginPositionY > touchEndPositonY)
3. {
4.    // This is a swipe going down
5. }
6. else
7. {
8.    // This is a swipe going up
9. }

Is this correct?? Or am I going about this wrong?

 

You could calculate the vector from start to endpoint - and then see where it points in terms of angle to e.g. a horisontal vector.

 

Also you might want to take speed into account so that a "move" / "drag" is not perceived as a "swipe".

 

I did something similar, but with mapping moving your finger to the camera's X/Z translation.

If touch is phase 'moved':
-Grab touch.positionDelta
-Multiply it by a custom scroll speed scalar
-Apply to camera.transform.position

That ties the camera movement directly to finger dragging (in real-time). If you want to limit it to quick 'swipes' instead of all moves, you could check if the positionDelta is greater than a certain amount before continuing. The problem with the touch.begin / touch.end approach is that you don't register something as a swipe until the action is completed - by checking positionDelta you can flag a swipe as soon as it begins, and control the speed at which movement is considered a 'swipe'.