Using the Drag Gesture
Drag returns the horizontal and vertical magnitude of change between the user touching and removing their touch from a multitouch surface.
Mechanics and Code Samples
To register a ‘drag’ event, finger(s) must touch down on the screen, slide to another location and then be lifted up again.
Enable the Drag gesture on a TouchSprite ("myTouchSprite" in this example) by adding the gesture to the gestureList property for the TouchSprite:
1 | myTouchSprite.gestureList = {"n-drag":true}; |
Register an event for the gesture by listening for the 'DRAG' GWGestureEvent:
2 | myTouchSprite.addEventListener(GWGestureEvent.DRAG, gestureDragHandler); |
Finally, implement the script(s) that you want to respond to the event in a custom handler:
3 4 5 6 7 8 | private function gestureDragHandler(event:GWGestureEvent):void { trace("g drag: ", event.value.dx, event.value.dy); event.target.$x += event.value.dx; event.target.$y += event.value.dy; } |
In this example, the x and y coordinate delta values of the Drag gesture are being sent used to perform a translation using the custom built in affine transform methods.
Gestures can be utilized with a number of touch points. For detailed information about this gesture and more, consult the GestureML Wiki.
