Add a minimum finger distance

A sane minimum for finger distance so that we can never have events where fingers overlay exactly, messing up scale and rotation.

framer/GestureInputRecognizer.coffee

@@ -8,6 +8,7 @@ GestureInputVelocityTime = 0.1
GestureInputForceTapDesktop = MouseEvent.WEBKIT_FORCE_AT_FORCE_MOUSE_DOWN
GestureInputForceTapMobile = 0.7
GestureInputForceTapMobilePollTime = 1/30
GestureInputMinimumFingerDistance = 30

{DOMEventManager} = require "./DOMEventManager"

@@ -287,7 +288,7 @@ class exports.GestureInputRecognizer
		if @session.started.pinch and event.fingers == 1
			@pinchend(event)
		# If we did not start yet and get two fingers, start
		else if not @session.started.pinch and event.fingers == 2 
		else if not @session.started.pinch and event.fingers == 2
			@pinchstart(event)
		# If we did start send pinch events
		else if @session.started.pinch
@@ -363,7 +364,7 @@ class exports.GestureInputRecognizer
			touchPointB = @_getTouchPoint(event, 1)
			event.touchCenter = Utils.pointCenter(touchPointB, touchPointA)
			event.touchOffset = Utils.pointSubtract(touchPointB, touchPointA)
			event.touchDistance = Utils.pointDistance(touchPointA, touchPointB)		
			event.touchDistance = _.max([GestureInputMinimumFingerDistance, Utils.pointDistance(touchPointA, touchPointB)])
			event.rotation = Utils.pointAngle(touchPointA, touchPointB)

		# Special cases