flash8：一帧做出雪景画面

fallSnow(this,150, [600, 375]); function fallSnow(path, num, size) { for (var i = 0; i<num; i++) { path.createEmptyMovieClip("xue"+i, i); var mc = path["xue"+i]; mc._x = random(size[0]); mc._y = random(size[1]); mc.ro = [1, -1][random(2)]; mc.xtime = random(20); mc.startTime = 0; mc.id = Math.pow(i, 1/2); createSnow(mc, mc.id/2.5, "0xffffff", 20*mc.id); } var loop = function () { updateAfterEvent(); for (var i = 0; i<num; i++) { var mc = path["xue"+i]; mc._rotation += mc.ro*5; mc._x += mc.id*mc.ro/10; mc._y += mc.id/2; mc.startTime++; scanTar(mc); scanEdge(mc, size); } }; var interval = setInterval(loop, 10); } function createSnow(mc, radius, c, alpha) { with (mc) { moveTo(0, -radius); beginFill(c, alpha); linestyle(0, "0x000000", 0); for (var i = 1; i<=6; i++) { var a1 = -Math.PI/6+i*Math.PI/3; var a2 = i*Math.PI/3; lineTo((radius/5)*Math.sin(a1), -(radius/5)*Math.cos(a1)); lineTo(radius*Math.sin(a2), -radius*Math.cos(a2)); } endFill(); } } function scanTar(mc) { if (mc.startTime>=mc.xtime) { mc.startTime = 0; mc.xtime = random(20); mc.ro = [1, -1][random(2)]; } } function scanEdge(mc, size) { if (mc._x>size[0]) { mc._x = 0; } else if (mc._x<0) { mc._x = size[0]; } if (mc._y>size[1]) { mc._y = 0; } }