Flash CS4教程：AS3制作非常漂亮的曲线

		public function LineEffect()
		{

			this.addChild(sp);
			this.addEventListener(Event.ENTER_FRAME, onEnter);

			drawFireBtn(fireBtn);
			drawSkyBtn(skyBtn);
			drawGrassBtn(grassBtn);
			drawSunBtn(sunBtn);

			fireBtn.addEventListener(MouseEvent.CLICK, makeFire);
			skyBtn.addEventListener(MouseEvent.CLICK, makeSky);
			grassBtn.addEventListener(MouseEvent.CLICK,makeGrass);
			sunBtn.addEventListener(MouseEvent.CLICK, makeSun);

			sp.filters = [bf, dropShadow];
		}
        }
}

Enter Frame Function

The following Enter Frame function will track the mouse coordinates and show the effect on the stage .

		private function onEnter(e:Event):void
		{
			var line:Graphics = sp.graphics;
			line.clear();
			line.lineStyle(2, 0xffffff);
			line.moveTo(mouseX, mouseY);

            var dx:Number = this.mouseX - prevmouseX;
			var vx:Number = dx ? dx : Math.random() * randSet(-1, 1);
			var dy:Number = this.mouseY - prevmouseY;
			var vy:Number = dy ? dy : Math.random() * randSet(-1, 1);
			var pLen:Number = points.push({x:this.mouseX, y:this.mouseY, vx:vx / 20, vy:vy / 20, life:getTimer()});

			for (var i:Number = 0; i < pLen; i++)
			{
				if (!points[i])
				{
					continue
				}
				if (getTimer() - points[i].life > 1000)
				{
					points.splice(i--, 1)
				}
				else
				{
					if (i!=0 && points[i])
					{
						points[i].x += points[i].vx;
						points[i].y += points[i].vy;
						var cx:Number = points[i - 1].x;
						var cy:Number = points[i - 1].y;
						line.curveTo(cx, cy, (points[i].x + cx) * 0.5, (points[i].y + cy) * 0.5 );
					}
					else
					{
						line.moveTo(points[i].x, points[i].y);
					}
				}
			}

			prevmouseX = this.mouseX;
			prevmouseY = this.mouseY;
                }
                private function randSet(p_min:Number,p_max:Number):Number
		{
			return Math.floor(Math.random() * 2);
		}
        }
}

Draw the buttons an

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