pure as3创造一个线条曲线效果实例

作者：袖梨 2022-06-28

粒子有x,y,vx,vy属性，vx,vy为速度。
色彩变换用colortransform的参数变换实现
飘影用位图的appleTransform

代码如下 复制代码
package
{
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Shape;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.geom.ColorTransform;

/**
* ...
* @author lizhi https://www.111cn.net/
*/
[SWF(width=465,height=465,backgroundColor=0xffffff,frameRate=60)]
public class Main extends Sprite
{
private var w:int;
private var h:int;
private var ps:Array;
private var pen:Shape = new Shape;
private var bmd:BitmapData;
private var ct:ColorTransform = new ColorTransform(0.999, 0.95, 0.99);
private var max:Number = ct.redMultiplier;
private var min:Number = ct.blueMultiplier;
private var vr:Number = 0.0001;
private var vg:Number = vr;
private var vb:Number = vr;

public function Main():void
{
w = stage.stageWidth;
h = stage.stageHeight;
bmd = new BitmapData(w, h, false, 0);
addChild(new Bitmap(bmd));

var c:int = 10;
ps = [];
while (c-->0) {
ps.push(new Particle(w * Math.random(), h * Math.random(),(Math.random()-0.5)*2,(Math.random()-0.5)*2));
}
addEventListener(Event.ENTER_FRAME, init);
}

private function init(e:Event = null):void
{
for each(var p:Particle in ps) {
p.x += p.vx;
p.y += p.vy;
if (p.x p.x = 0;
p.vx = Math.abs(p.vx);
}
if (p.y p.y = 0;
p.vy = Math.abs(p.vy);
}
if (p.x>w) {
p.x = w;
p.vx = -Math.abs(p.vx);
}
if (p.y>h) {
p.y = h;
p.vy = -Math.abs(p.vy);
}
}

pen.graphics.clear();
pen.graphics.lineStyle(0,0xffffff);
pen.graphics.moveTo(ps[0].x/2+ps[1].x/2,ps[0].y/2+ps[1].y/2);
for (var i:int = 1; i p = ps[i + 1];
if (p == null) p = ps[0];
pen.graphics.curveTo(ps[i].x, ps[i].y, ps[i].x / 2 + p.x / 2, ps[i].y / 2+ p.y / 2);
}
pen.graphics.curveTo(ps[0].x, ps[0].y, ps[0].x/2+ps[1].x/2,ps[0].y/2+ps[1].y/2);

ct.redMultiplier += vr;
ct.greenMultiplier += vg;
ct.blueMultiplier += vb;
if (ct.redMultiplier > max) {
ct.redMultiplier = max;
vr = -Math.abs(vr);
}
if (ct.redMultiplier ct.redMultiplier = min;
vr = Math.abs(vr);
}

if (ct.greenMultiplier > max) {
ct.greenMultiplier = max;
vg = -Math.abs(vg);
}
if (ct.greenMultiplier ct.greenMultiplier = min;
vg = Math.abs(vg);
}

if (ct.blueMultiplier > max) {
ct.blueMultiplier = max;
vb = -Math.abs(vb);
}
if (ct.blueMultiplier ct.blueMultiplier = min;
vb = Math.abs(vb);
}

bmd.colorTransform(bmd.rect, ct);
bmd.draw(pen);
}

}
}
import flash.geom.Point;

class Particle extends Point
{
public var vx:Number;
public var vy:Number;
public function Particle(x:Number,y:Number,vx:Number,vy:Number)
{
super(x, y);
this.vx = vx;
this.vy = vy;
}
}

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