特別的爆破效果

//這裡的數學是根據需求自己重新定義的
Math.toDegrees = function (theta) {
return theta * 180 / Math.PI;
}

Math.toRadians = function (theta) {
return theta * Math.PI / 180;
}

Math.cosd = function (theta) {
return Math.cos(Math.toRadians(theta));
}

Math.sind = function (theta) {
return Math.sin(Math.toRadians(theta));
}

Particle3d = function (mcPath, initX, initY, initZ, velX, velY, velZ) {
this.graphic = eval(mcPath);
//3D空間中的位置...
this.x = initX;
this.y = initY;
this.z = initZ;
//根據指定座標的速率
this.vx = velX;
this.vy = velY;
this.vz = velZ;
//用來記錄"暫時"的旋轉座標
this.tx = this.x;
this.ty = this.y;
this.tz = this.z;

this.age = 0; //周期
this.dying = false;

this.graphic.init(); //初始MC
_parent.living.push(1);
}

Particle3d.prototype.live = function () {
this.move();
if (!clip) {
this.project();
this.render();
}
this.age++;
this.graphic.nextFrame();

if (this.age > this.lifespan && this.dying == false) {
this.kill();
}
}

Particle3d.prototype.move = function () {
this.vx += this.ax;
this.vy += this.ay;
this.vz += this.az;
this.vRot += this.aRot;

this.vx *= (1 - this.frictionX);
this.vy *= (1 - this.frictionY);
this.vz *= (1 - this.frictionZ);
this.vRot *= (1 - this.frictionRot);

//根據速率計算新的座標
this.x += this.vx;
this.y += this.vy;
this.z += this.vz;
this.rotation += this.vRot;
}

Point.prototype.rotateY = function (ry) {
//根據Y座標旋轉
this.cosRY = Math.cosd(ry);
this.sinRY = Math.sind(ry);

this.tx = this.x * this.cosRY + this.z * this.sinRY;
this.tz = this.x * -this.sinRY + this.z * this.cosRY;

this.x = this.tx;
this.z = this.tz;
}

Particle3d.prototype.project = function () {
//把3D座標顯示
//假如鼠標拖動就根據Y旋轉
if (this.rotating == true) {
//根據鼠標的位置計算出旋轉的角度
this.ry = _root.explosion.dragger._x;
//建立一個暫時的point來記錄旋轉
newP = new Point(this.x, this.y, this.z);
newP.rotateY(this.ry);
this.tx = newP.x;
this.ty = newP.y;
this.tz = newP.z;
delete (newP);
needRotation = true;

} else {
if (needRotation) { //當滑鼠放開時
//重新旋轉的座標有做下一次的旋轉
this.x = this.tx;
this.y = this.ty;
this.z = this.tz;

newP = new Point(this.vx, this.vy, this.vz);
newP.rotateY(this.ry);
this.vx = newP.x;
this.vy = newP.y;
this.vz = newP.z;
delete (newP);
needRotation = false;
this.ry = 0;
}
this.tx = this.x;
this.ty = this.y;
this.tz = this.z;
}

var d = 250; //鏡頭的角度
//mx, my, mz 可以旋轉全域的point
var mx = this.tx;
var my = this.ty;
var mz = this.tz + 45;
if (mz < 1) clip = true;
var pers = d / (1+mz); //計算perspective
this.sx = mx * pers;
this.sy = my * pers;

//根據距離感設定大小
this.scale = pers * 45;
}

Particle3d.prototype.render = function () {
this.graphic._x = this.sx;
this.graphic._y = -this.sy;
this.graphic._xscale = this.scale;
this.graphic._yscale = this.scale;
this.graphic._rotation = -this.rotation;
}

Particle3d.prototype.kill = function () {
this.graphic.kill();
this.dying = true;
}

Particle3d.prototype.toString = function () {
//用來除錯... :)
var output = "x=" + this.x;
output += " y=" + this.y;
output += " z=" + this.z;
output += " vx=" + this.vx;
output += " vy=" + this.vy;
output += " vz=" + this.vz;
output += " ax=" + this.ax;
output += " ay=" + this.ay;
output += " az=" + this.az;
output += " sx=" + this.sx;
output += " sy=" + this.sy;
return output;
}

function Point (inx, iny, inz) {
this.x = inx;
this.y = iny;
this.z = inz;
}

Movieclip.prototype.Point = _root.Point;
Movieclip.prototype.Particle3d = _root.Particle3d;



------------------------------------------------------------------------------
this.init();

function init() {
this.createParticles(this.maxParticles);
living = new Array();
this.dragging = false;
flare.play(); //閃光
}

function live() {
//當所有的particle的週期過了之後重新設定
if (this.living.length == 0) {
resetParticles(this.maxParticles);
}
}

function createParticles(num) {
for (var i=1; i<=num; i++) {
var pName = "p" + i;
duplicateMovieClip("path_streak", pName, i);
}
path_fragment._visible = false;
}

function resetParticles(num) {
for (var i=1; i<=num; i++) {
var pName = "p" + i;
this[pName].init();
}
flare.play();
}



------------------------------------------------------------------------------
this.init();

function init() {
iSpeed = 2.6;
iTheta = Math.random() * 360; //亂數取得角度
iPhi = Math.random() * 180;

initVelX = iSpeed * Math.cosd(iTheta) * Math.sind(iPhi);
initVelY = iSpeed * Math.sind(iTheta) * Math.sind(iPhi) + 1.5;
initVelZ = iSpeed * Math.cosd(iPhi);

p = new Particle3d("fragment", 0, 0, 0, initVelX, initVelY, initVelZ);

p.ax = p.az = 0;
p.ay = -.05; //重力

p.vRot = 500 * (Math.random()-.5); //設定旋轉速度

p.frictionX = .09;
p.frictionY = .09;
p.frictionZ = .09;
p.frictionRot = .025;

p.lifespan = 50 + Math.floor(Math.random()*20);

}

function live() {
if (_parent.dragging == false) {
p.rotating = false;
p.live();
} else {
//當滑鼠拖動的時候停止播放和進行旋轉
p.rotating = true;
p.project();
p.render();
}
}