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题 目:制作烟花粒子的特效代码

我这个Flash烟花粒子特效的制作其实很简单。

　　第一步：在Flash中建立画布550*400（宽度随便设的，高度应在200以上，因为烟花显示的高度是200，这个也可以在代码里修改，代码第六行 var rect:Rectangle = new Rectangle(0, 0, Stage.width, 200); 这个200就是高度）
第二步：在空白帧上点右键-动作 输入以下Action Script代码。
Stage.scaleMode = "noScale";
import Flash.display.BitmapData;
import Flash.filters.ConvolutionFilter;
import Flash.geom.Rectangle;
var con = new ConvolutionFilter(3, 3, [1, 1, 1, 1, 30, 1, 1, 1, 1], 38);
var rect:Rectangle = new Rectangle(0, 0, Stage.width, 200);
var bitmap1 = new BitmapData(rect.width, rect.height, false,0x00000000);
var bitmap2 = new BitmapData(rect.width, rect.height, true,0x00000000);
var bitmapShow1 = createEmptyMovieClip("bitmapShow1", 1).attachBitmap(bitmap1, 1);
//粒子的显示画布
var bitmapShow2 = createEmptyMovieClip("bitmapShow2", 2).attachBitmap(bitmap2, 2);
//白色闪光点的显示画布
var m_mouseX;//鼠标x坐标
var m_mouseY;//鼠标y坐标
var sound1 = new Sound();
//上升过程的声音
var sound2 = new Sound();//爆炸声音
var bit_px = new Array(bits);//爆炸过程的x坐标
var bit_py = new Array(bits);//爆炸过程的y坐标
var bit_vx = new Array(bits);//爆炸过程的x速度
var bit_vy = new Array(bits);//爆炸过程的y速度
var bit_sx = new Array(bits);//上升过程的x坐标
var bit_sy = new Array(bits);//上升过程的y坐标
var bit_l = new Array(bits);//粒子的生命时间
var bit_f = new Array(bits);//是上升还是爆炸的标志
var bit_p = new Array(bits);//随机出现白色闪光点的标志
var bit_c = new Array(bits);//粒子颜色
init();
function init() {
sound1.attachSound("sound1");
sound2.attachSound("sound2");
bits = 500;//总的最大粒子数
bit_max = 50;//一次出现的粒子数
bit_sound = 2;
for (var j = 0; j<bits; j++) {
bit_f[j] = 0;
}
}
onEnterFrame = function () {
bitmap2.fillRect(new Rectangle(0, 0, rect.width, rect.height), 0x00000000);
//白色闪光点清除
//bitmap2.applyFilter(bitmap, bitmap.rectangle, new Point(0, 0), con);
rend();
bitmap1.applyFilter(bitmap1, bitmap1.rectangle, new Point(0, 0), con);
//模糊滤镜
};
onMouseDown = function () {
m_mouseX = _root._xmouse;
m_mouseY = _root._ymouse;
if (rect.contains(m_mouseX, m_mouseY)) {
var k = int(Math.random()*256);
var l = int(Math.random()*256);
var i1 = int(Math.random()*256);
var j1 = k << 16 | l << 8 | i1;
var k1 = 0;
for (var l1 = 0; l1<bits; l1++) {
if (bit_f[l1] != 0) {
continue;
}
bit_px[l1] = m_mouseX;
bit_py[l1] = m_mouseY;
var d = Math.random()*6.28;
var d1 = Math.random();
bit_vx[l1] = Math.sin(d)*d1/2;
bit_vy[l1] = Math.cos(d)*d1/2;
bit_l[l1] = int(Math.random()*100)+100;
bit_p[l1] = int(Math.random()*3);
if (random(4) == 0) {
bit_c[l1] = 0xFFFFFF;
} else {
bit_c[l1] = j1;
}
bit_sx[l1] = m_mouseX;
bit_sy[l1] = rect.height-5;
bit_f[l1] = 2;
if (++k1 == bit_max) {
break;
}
}
sound1.start(0);
}
};
function rend() {
var flag:Boolean = false;
var flag1:Boolean = false;
var flag2:Boolean = false;
for (var k = 0; k<bits; k++) {
switch (bit_f[k]) {
case 1 :　// 爆炸过程
bit_vy[k] += Math.random()/100;
bit_px[k] += bit_vx[k];
bit_py[k] += bit_vy[k];
bit_l[k]--;
if (bit_l[k] == 0 || !rect.contains(bit_px[k], bit_py[k])) {
bit_c[k] = 0x000000;
bit_f[k] = 0;
} else if (bit_p[k] == 0) {
if (int(Math.random()*2) == 0) {
bit_setwhite(int(bit_px[k]), int(bit_py[k]), 0xFFFFFFFF);
}
bit_set(int(bit_px[k]), int(bit_py[k]), int(bit_c[k]));
} else {
bit_set(int(bit_px[k]), int(bit_py[k]), int(bit_c[k]));
}
break;
case 2 :　　// 上升过程
bit_sy[k] -= 5;
if (bit_sy[k]<=bit_py[k]) {
bit_f[k] = 1;
flag2 = true;
}
if (int(Math.random()*20) == 0) {
var i = int(Math.random()*2);
var j = int(Math.random()*5);
bit_set(bit_sx[k]+i, bit_sy[k]+j, 0xFFFFFF);
}
break;
}
}
if (flag2) {
sound2.start(0);
}
}
function bit_set(i:Number, j:Number, k:Number) {
bitmap1.setPixel(i, j, k);
}
function bit_setwhite(i:Number, j:Number, k:Number) {
bitmap2.setPixel32(i, j, k);//白色闪光点
}
最后测试影片。

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