ActionScript 3 放大鼠标位置

Posted 2021-05-23

import fl.transitions.Tween;
import fl.transitions.TweenEvent;
import fl.transitions.easing.*;
import fl.motion.MatrixTransformer;

const TWEEN_IN:String = "tweenIn";
const TWEEN_OUT:String = "tweenOut";
var tweenDirection:String;

var internalPoint:Point;
var externalPoint:Point;
var tw:Tween;

var square:Sprite = new Sprite();
square.graphics.beginFill(0xFF0000);
square.graphics.drawRect(0, 0, 100, 100);

square.x = stage.stageWidth/2 - square.width/2;
square.y = stage.stageHeight/2 - square.height/2;

addChild(square);

square.addEventListener(MouseEvent.CLICK, zoomIn);

function zoomIn($e:MouseEvent):void
{
	square.removeEventListener(MouseEvent.CLICK, zoomIn);
	
	internalPoint = new Point(square.mouseX, square.mouseY);
	externalPoint = new Point(stage.mouseX, stage.mouseY);
	
	var marker:Sprite = new Sprite();
	marker.graphics.beginFill(0);
	marker.graphics.drawCircle(0, 0, 5);
	marker.x = internalPoint.x;
	marker.y = internalPoint.y;
	marker.name = "marker";
	
	square.addChild(marker);
	
	tweenDirection = TWEEN_IN;
	
	tw = new Tween(null, "", Elastic.easeOut, square.scaleX, 4, 1, true);
	tw.addEventListener(TweenEvent.MOTION_CHANGE, _syncScale);
	tw.addEventListener(TweenEvent.MOTION_FINISH, _cleanTween);
}

function _syncScale($e:TweenEvent):void
{
	square.scaleX = square.scaleY = tw.position;
	
	var matrix:Matrix = square.transform.matrix;
	
	MatrixTransformer.matchInternalPointWithExternal(matrix, internalPoint, externalPoint);
	
	square.transform.matrix = matrix;
}

function _cleanTween($e:TweenEvent):void
{
	tw.removeEventListener(TweenEvent.MOTION_CHANGE, _syncScale);
	tw.removeEventListener(TweenEvent.MOTION_FINISH, _cleanTween);
	
	tw = null;
	
	if(tweenDirection == TWEEN_IN)
		stage.addEventListener(MouseEvent.CLICK, zoomOut);
	else if(tweenDirection == TWEEN_OUT)
		square.addEventListener(MouseEvent.CLICK, zoomIn);
}

function zoomOut($e:MouseEvent):void
{
	stage.removeEventListener(MouseEvent.CLICK, zoomOut);
	
	externalPoint = square.localToGlobal(internalPoint);
	internalPoint = square.globalToLocal(externalPoint);
	
	square.removeChild(square.getChildByName("marker"));
	
	tweenDirection = TWEEN_OUT;
	
	tw = new Tween(null, "", Strong.easeOut, square.scaleX, 1, 1, true);
	tw.addEventListener(TweenEvent.MOTION_CHANGE, _syncScale);
	tw.addEventListener(TweenEvent.MOTION_FINISH, _cleanTween);