149 lines
3.1 KiB
ActionScript
149 lines
3.1 KiB
ActionScript
package {
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import flash.display.*;
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import flash.events.*;
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import flash.utils.*;
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import flash.system.*;
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import flash.geom.*;
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public class Flake extends Sprite {
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public var api:Object;
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//父容器
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public var snow:Snow;
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//幅度
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public var tb:Number = 0;
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//
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public var tx:Number = 0;
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public var ty:Number = 0;
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public var ts:Number = 1;
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//是否跳过停留
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public var wins:DisplayObject;
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public var skipped:Boolean = false;
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public var stopped:Boolean = false;
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//测试点和停留点
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public var point_test:Point = new Point();
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public var point_stop:Point = new Point();
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public var timeid:uint;
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public var thawing:Boolean = false;
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public function Flake(_snow:Snow):void {
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snow = _snow;
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api = snow.api;
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draw();
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//初始化属性
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tb = 100 * Math.random();
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tx = x = snow.tw * Math.random();
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ty = y = -50 * Math.random();
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ts = 0.1 + Math.random();
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scaleX = scaleY = ts;
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alpha = ts - 0.1;
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cacheAsBitmap = true;
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addEventListener(Event.ENTER_FRAME, update);
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}
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public function update(e:Event):void {
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//是否正在融化
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if (thawing) {
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//一成概率融化
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if (Math.random() < 0.1) {
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var a:Number = alpha - 0.01;
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if (a > 0) {
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alpha = a;
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} else {
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remove();
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return;
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}
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}
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}
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//停留判断
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if (!skipped) {
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var test:Boolean = isOnCMP();
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if (test) {
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if (stopped) {
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if (!point_test.equals(point_stop)) {
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skipped = true;
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}
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return;
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}
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//三成概率跳过
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if (Math.random() < 0.3) {
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skipped = true;
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} else {
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//停留
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stopped = true;
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snow.num_stopped ++;
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//记录停留的位置，克隆最后的测试点
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point_stop = point_test.clone();
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//10秒后开始融化
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timeid = setTimeout(thaw, 10000);
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return;
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}
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} else if (stopped) {
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//对于已经停止的，但移动后，则跳过
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skipped = true;
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}
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}
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tx += Math.sin(tb ++ * 0.05) + ts * snow.speed_x;
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if (tx < 0) {
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tx += snow.tw;
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} else if (tx > snow.tw) {
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tx -= snow.tw;
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}
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//
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ty += ts * snow.speed_y + ts * Math.abs(snow.speed_x) * 0.5;
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//继续飘落
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x = tx;
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y = ty;
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//到达地面，移除
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if (ty > snow.th) {
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remove();
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}
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}
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public function isOnCMP():Boolean {
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for each (var w:Object in api.win_list) {
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if (w.visible) {
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if (w.hitTestPoint(x, y, true)) {
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//记录测试的位置
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point_test = w.globalToLocal(new Point(x, y));
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return true;
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}
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}
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}
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return false;
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}
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//进入融化
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public function thaw():void {
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thawing = true;
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}
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public function remove():void {
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clearTimeout(timeid);
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removeEventListener(Event.ENTER_FRAME, update);
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if (snow.contains(this)) {
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snow.removeChild(this);
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}
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if (snow.num_stopped > 0 && stopped) {
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snow.num_stopped --;
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}
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}
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//画一个雪花
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public function draw():void {
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this.graphics.beginFill(0xffffff, 0.5);
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this.graphics.drawCircle(0, 0, 3);
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this.graphics.endFill();
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this.graphics.beginFill(0xffffff, 1);
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this.graphics.drawCircle(0, 0, 2);
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this.graphics.endFill();
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}
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}
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} |