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Start Flash ActionScript Animation with Button

This Flash ActionScript tutorial demonstrate a more interesting animation. The object on the stage will be animated to the location where the mouse click.

Please update flash player to view this Flash ActionScript tutorial!

Flash Tutorial Content:

In this Flash ActionScript tutorial the football will be animated to the mouse click location with ENTER_FRAME event.

The complete Flash Movie is shown as above, you may try how it works before you start this tutorial. Click on the above flash movie to select it to start. Click your mouse anywhere on the stage, the football will be moved to the mouse click location. An easing (damping) effect is also apply to the motion so that the football will be moving slowly and slowly when approaching the destination.

Flash ActionScript Codes:

//Set a damping factor of the movement of football (easing factor)
var easing:Number = .2;

//dx is the x displacement of ball
//dy is the y displacement of ball
var dx:Number;
var dy:Number;

//mouseLocX is the x location of mouse pointer when click
//mouseLocY is the y location of mouse pointer when click
var mouseLocX:Number;
var mouseLocY:Number;

//Get the width and height of the ball
//var mcWidth = football_mc.width/2;
//var mcHeight = football_mc.height/2

//Listen to mouse down event
stage.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownLocation);

 

function mouseDownLocation(evt:MouseEvent) {

//Get location of Mouse Pointer on stage
mouseLocX = evt.stageX;
mouseLocY = evt.stageY;

}

 

//Use ENTER_FRAME event perform screen update
stage.addEventListener(Event.ENTER_FRAME, moveFootball);

function moveFootball(evt:Event) {

//dx is the x movement distance of ball
dx = (mouseLocX - football_mc.x) * easing;
//dy is the y movement distance of ball
dy = (mouseLocY - football_mc.y) * easing;

//It seems that football_mc.x can never equal to destinationX
//Therefore it is better to use the difference to stop the movement
if ((dx > 0.2) || (dx < -0.2)) {
football_mc.x += dx;
football_mc.y += dy;
//Display message in Message Box
//The distance (dx) round up to one decimal point only
output_txt.text = "Distance to Target: " + Math.round(dx * 10) / 10;
} else {output_txt.text = "Click the mouse pointer anywhere on the stage to move the ball." ;}

}

Download Flash Source File:

Flash Source File enter-frame-4.fla

Remarks:

You should noticed that most flash animation on the Internet are mostly loop animation, i.e. animation repeat again and again. The next Flash ActionScript tutorial will show how to use ENTER_FRAME to do loop animation.