package
{
import flash.display.*;
import flash.events.*;
import flash.geom.*;
/**
* ...
* @author Alex Lexcuk
*/
public class DocMoveCurve extends Sprite
{
public var debSp:Sprite;
public var lastM:Point = new Point();
public var curM:Point = new Point();
public var b:Point = new Point();
public var speedStep:int = 10;
public var curveArr:Vector.<Point> = new Vector.<Point>();
public var persSp:Sprite;
public var frameCount:int;
public function DocMoveCurve()
{
addChild(debSp = new Sprite());
addChild(persSp = new Sprite());
debSp.graphics.lineStyle(0);
persSp.graphics.beginFill(0xFF0080);
persSp.graphics.drawCircle(0, 0, 5);
curveArr.push(new Point());
stage.addEventListener(MouseEvent.CLICK, stageClickHandler);
addEventListener(Event.ENTER_FRAME, enterFrameHandler);
}
public function enterFrameHandler(e:Event):void {
persSp.x = curveArr[frameCount].x;
persSp.y = curveArr[frameCount].y;
frameCount++;
if (frameCount >= curveArr.length) frameCount = 0;
}
public function stageClickHandler(e:MouseEvent):void {
drawMousePath();
}
public function drawMousePath():void {
var mx:Number = debSp.mouseX;
var my:Number = debSp.mouseY;
var bt:Point = new Point(lastM.x - b.x,lastM.y - b.y);
var mt:Point = new Point(lastM.x - mx, lastM.y - my);
bt.normalize( mt.length / 2);
b = bt.add(lastM);
debSp.graphics.moveTo(lastM.x, lastM.y);
debSp.graphics.curveTo(b.x, b.y, mx, my);
debSp.graphics.drawCircle(b.x, b.y, 4);
curM = new Point(mx, my);
addToArrPosCurve();
lastM = new Point(mx, my);
}
public function addToArrPosCurve():void {
var i:int;
var p:Point = new Point();
var lp:Point = lastM.clone();
var ps:Point;
for (i = 0; i <= 100; i++) {
p.x = myCurveTo(lastM.x, b.x, curM.x, i / 100);
p.y = myCurveTo(lastM.y, b.y, curM.y, i / 100);
ps = p.subtract(lp);
if (ps.length > speedStep) {
curveArr.push(lp = p.clone());
debSp.graphics.drawCircle(p.x, p.y, 4);
}
}
}
public function myCurveTo(n1:int, n2:int, n3:int, n4:Number):Number{
return (1 - n4) * (1 - n4) * n1 + 2 * n4 * (1 - n4) * n2 + n4 * n4 * n3;
}
}
}
http://murmadillo.tut.su/m/doc-move-curve.swf
