AS3: Swipe Gesture With Velocity - actionscript-3

Question

So I would like to add velocity to my swipe gesture. Currently I have it moving 10 px on swipe, but I want it to move with a velocity so the user can toss the object around on the screen. Here's the code I am currently using with the object moving the 10 px.
function onSwipe (e:TransformGestureEvent):void{
player_mc.gotoAndStop(5);
if (e.offsetX == 1) {
//User swiped towards right
player_mc.x += 10;
}
if (e.offsetX == -1) {
//User swiped towards left
player_mc.x -= 10;
}
if (e.offsetY == 1) {
//User swiped towards bottom
player_mc.y += 10;
}
if (e.offsetY == -1) {
//User swiped towards top
player_mc.y -= 10;
}
if(collision(player_mc.cp, level_mc))
{
player_mc.x = player_mc.prevX;
player_mc.y = player_mc.prevY;
}
}
Thanks for the help

Answer 1

Here is a way you can do this: (you'll want to swap the mouse events for touch events if using on mobile)
player_mc.addEventListener(MouseEvent.MOUSE_DOWN,startSwipe);
player_mc.addEventListener(MouseEvent.MOUSE_UP,endSwipe);
var velocity:Point = new Point(); //this stores the current velocity of the object
var previous:Point = new Point(); //this stores the previous frames x/y of the object.
var isDragging:Boolean = false;
var friction:Number = .85; //this how quickly to slow down the object once the mouse is released - smaller the number (must be less than 1) the quicker the object will slow/stop
function startSwipe(e){
isDragging = true;
player_mc.startDrag(false);
this.addEventListener(Event.ENTER_FRAME,enterFrameHandler);
}
function enterFrameHandler(e):void {
if(isDragging){
velocity.x += player_mc.x - previous.x; //we're adding the new velocity to the old one, then dividing in half to average the value - this makes it seem smoother
velocity.y += player_mc.y - previous.y;
velocity.x *= .5; //dividing in half
velocity.y *= .5;
previous.x = player_mc.x;
previous.y = player_mc.y;
}else{
velocity.x *= friction; //gradually slow down the object
velocity.y *= friction;
player_mc.x += velocity.x;
player_mc.y += velocity.y;
if(velocity.x < .05 && velocity.y < .05){ //once it gets slow enough, stop the enter frame handler
this.removeEventListener(Event.ENTER_FRAME,enterFrameHandler);
}
}
trace(velocity);
}
function endSwipe(e){
player_mc.stopDrag();
isDragging = false;
}