矢印破線

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license : MIT License
modified : 2010-02-08 17:48:27

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package
{
	import flash.display.Graphics;
	import flash.display.Shape;
	import flash.display.Sprite;
	import flash.events.MouseEvent;
	import flash.geom.Point;

public class ArrowBreakLine extends Sprite
	{
		public function ArrowBreakLine()
		{
			var shape:Shape = addChild(new Shape())as Shape;
			var flg:Boolean=true;
			var p:Point = new Point(232,232);
			
			stage.addEventListener(MouseEvent.CLICK,click);
			stage.addEventListener(MouseEvent.MOUSE_MOVE,loop);
			
			function loop(e:MouseEvent):void
			{
				shape.graphics.clear();
				drawBreakLine(shape.graphics,p,new Point(mouseX,mouseY));
			}
			
			function click(e:MouseEvent):void
			{
				if(!flg)
				{
					p.x = mouseX;
					p.y = mouseY;
					stage.addEventListener(MouseEvent.MOUSE_MOVE,loop);
				}
				else
				{
					stage.removeEventListener(MouseEvent.MOUSE_MOVE,loop);
				}
				flg = !flg;
			}
		}
		
		private function drawBreakLine(g:Graphics,fromPoint:Point,toPoint:Point,width:Number=1,space:Number=3,color:int=0,alpha:Number=1):void
		{
			if(width<0)width = 0;
			if(color<0)color = 0;
			if(space<0)space = 0;
			if(alpha<0)alpha = 0;
			
			var dist:Number = Math.abs(Point.distance(fromPoint,toPoint));
			var len:uint = dist/space/2;
			var prev:Point = fromPoint;
			var pa:Number=0;
			var p:Point;
			
			g.lineStyle(width,color,alpha);
			for(var i:uint=0; i<len; i++)
			{
				pa = 1-i/len;
				p = Point.interpolate(fromPoint,toPoint,pa);
				
				if(i%2==0)
				{
					g.moveTo(prev.x,prev.y);
					g.lineTo(p.x,p.y);
				}
				prev = p;
			}
			g.endFill();
			drawArrow(g,fromPoint,toPoint,10,color,alpha);
			
			p = null;
			prev = null;
		}
		
		private var pi:Number = Math.PI/180;
		private function drawArrow(g:Graphics,fromPoint:Point,toPoint:Point,size:Number=10,color:int=0,alpha:Number=1):void
		{
			if(color<0)color = 0;
			if(alpha<0)alpha = 0;
			
			var angle:Number = Math.atan2(toPoint.y-fromPoint.y,toPoint.x-fromPoint.x);
			
			g.beginFill(color,alpha);
			g.moveTo(toPoint.x + size*(Math.cos(angle)),toPoint.y + size*(Math.sin(angle)));
			g.lineTo(toPoint.x + size*(Math.cos(angle+pi*120)),toPoint.y + size*(Math.sin(angle+pi*120)));
			g.lineTo(toPoint.x + size*(Math.cos(angle+pi*240)),toPoint.y + size*(Math.sin(angle+pi*240)));
			g.lineTo(toPoint.x + size*(Math.cos(angle)),toPoint.y + size*(Math.sin(angle)));
			g.endFill();
		}
	}
}

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