极简单飘雪的制作 - 应用思考-教育技术论坛

1、导入任意一张你喜欢的背景图片到舞台然后锁定！（锁不锁无所谓）

2、新建图层二选中图层二第一帧按F8(打开动作面版)粘贴下面语句,回车测试.OK,一帧搞定!

脚本如下：

fallSnow(this, 100, [550, 400]);

function fallSnow(path, num, size) {

for (var i = 0; i<num; i++) {

path.createEmptyMovieClip("s"+i, i);

var mc = path["s"+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["s"+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;

}

OK了就这么简单