Forked from:: Saqoosha 's Painter 2

Painter 3

forked:1
favorite:1
lines:96
license : MIT License
modified : 2013-05-10 14:41:46

package
{
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Shape;
    import flash.display.Sprite;
    import flash.display.StageScaleMode;
    import flash.events.MouseEvent;
    import flash.geom.Point;

/**
     * @author Saqoosha
     */
    [SWF(backgroundColor="#000000", frameRate="60", width="475", height="475")]
    public class Painter3 extends Sprite
    {
        private var _canvasData:BitmapData = new BitmapData(475, 475, false, 0xffffff);
        private var _canvas:Bitmap = new Bitmap(_canvasData);
        private var _stroke:Shape = new Shape();
        private var _points:Vector.<Point> = new Vector.<Point>();

public function Painter3()
        {
            stage.scaleMode = StageScaleMode.NO_SCALE;
            stage.addEventListener(MouseEvent.MOUSE_DOWN, _mouseDownHandler);
            addChild(_canvas);
            addChild(_stroke);
        }

private function _mouseDownHandler(event:MouseEvent):void
        {
            stage.addEventListener(MouseEvent.MOUSE_MOVE, _mouseMoveHandler);
            stage.addEventListener(MouseEvent.MOUSE_UP, _mouseUpHandler);
            _points.length = 0;
            _stroke.graphics.lineStyle(5, 0xff0000, 0.5);
            _stroke.graphics.moveTo(event.stageX, event.stageY);
        }

private function _mouseMoveHandler(event:MouseEvent):void
        {
            _points.push(new Point(event.stageX, event.stageY));
            switch (_points.length)
            {
                case 3:
                {
                    new CatmullRom(_points[0], _points[0], _points[1], _points[2]).draw(_stroke.graphics);
                    break;
                }
                case 4:
                {
                    new CatmullRom(_points[0], _points[1], _points[2], _points[3]).draw(_stroke.graphics);
                    _points.shift();
                    break;
                }
            }
        }

private function _mouseUpHandler(event:MouseEvent):void
        {
            stage.removeEventListener(MouseEvent.MOUSE_MOVE, _mouseMoveHandler);
            stage.removeEventListener(MouseEvent.MOUSE_UP, _mouseUpHandler);
            _canvasData.draw(_stroke);
            _stroke.graphics.clear();
        }
    }
}

import flash.display.Graphics;
import flash.geom.Point;

class CatmullRom
{
    public var p0:Point;
    public var p1:Point;
    public var p2:Point;
    public var p3:Point;

public function CatmullRom(p0:Point = null, p1:Point = null, p2:Point = null, p3:Point = null)
    {
        this.p0 = p0 || new Point();
        this.p1 = p1 || new Point();
        this.p2 = p2 || new Point();
        this.p3 = p3 || new Point();
    }

public function getPointAt(t:Number, out:Point = null):Point
    {
        out ||= new Point();
        var t2:Number = t * t;
        var t3:Number = t2 * t;
        var a:Number = -t3 + 2 * t2 - t;
        var b:Number = 3 * t3 - 5 * t2 + 2;
        var c:Number = -3 * t3 + 4 * t2 + t;
        var d:Number = t3 - t2;
        out.x = (p0.x * a + p1.x * b + p2.x * c + p3.x * d) * 0.5;
        out.y = (p0.y * a + p1.y * b + p2.y * c + p3.y * d) * 0.5;
        return out;
    }

public function draw(graphics:Graphics, numSegments:int = 50):void
    {
        var p:Point = new Point();
        for (var i:int = 1; i <= numSegments; ++i)
        {
            getPointAt(i / numSegments, p);
            graphics.lineTo(p.x, p.y);
        }
    }
}

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