Swipe Angle

swipeangle.js

view.on("touchstart", function(e) {
	var touch = event.touches[0]
	//Grab the initial touch coordinates
	xInit = touch.pageX
	yInit = touch.pageY
})

view.on("touchmove", function(e) {
	var touch = event.touches[0]
	xCurrent = touch.pageX
	yCurrent = touch.pageY
	
	//Determine the distance between initial and current touch coordinates
	deltaX = xCurrent - xInit
	deltaY = yCurrent - yInit

	//Trig is awesome!
	theta = Math.atan2(deltaY, deltaX)
	theta *= 180/Math.PI 

	//Set a threshold on when to determine the angle
	if (Math.abs(deltaX) > 20 || Math.abs(deltaY) > 20) {
		switch (true)
			{
				//Swiping up while moving
				case (-135 < theta && theta < -45):
					break
				//Swiping right while moving
				case (-45 < theta && theta < 45):
					break
				//Swiping down while moving
				case (45 < theta && theta < 135):
					break
				//Swiping left while moving
				case (-135 > theta || theta > 135):
					break
			}
	}
})

view.on("touchend", function(){
	switch (true)
		{
			//Swiped up
			case (-135 < theta && theta < -45):
				break
			//Swiped right
			case (-45 < theta && theta < 45):
				break
			//Swiped down	
			case (45 < theta && theta < 135):
				break
			//Swiped left
			case (-135 > theta || theta > 135):
				break
		}
})