3D球棍模型

// 甲烷
function get_data_2() {
// 小球初始化
// 小球数目
sm = 5;
dot = new Array(sm);
for (i=0; i<sm; i++) {
dot[i] = new Object();
dot[i].x = 0;
dot[i].y = 0;
dot[i].z = 0;
dot[i].vx = 0;
dot[i].vy = 0;
dot[i].col = 0;
dot[i].r = 5;
}
// 0
dot[0].x = 50;
dot[0].y = 50;
dot[0].z = 50;
dot[0].col = 1;
// 1
dot[1].x = -50;
dot[1].y = -50;
dot[1].z = 50;
dot[1].col = 2;
// 2
dot[2].x = -50;
dot[2].y = 50;
dot[2].z = -50;
dot[2].col = 3;
// 3
dot[3].x = 50;
dot[3].y = -50;
dot[3].z = -50;
dot[3].col = 4;
// 4
dot[4].x = 0;
dot[4].y = 0;
dot[4].z = 0;
dot[4].col = 10;
// 小球初始化完成
//
// 小棍初始化
// 小棍的数目
sm_gun = 4;
gun = new Array(sm_gun);
for (i=0; i<sm_gun; i++) {
gun[i] = new Object();
gun[i].dot_s = 0;
gun[i].dot_e = 0;
gun[i].sx = 0;
gun[i].sy = 0;
gun[i].sz = 0;
gun[i].ex = 0;
gun[i].ey = 0;
gun[i].ez = 0;
gun[i].oy = 0;
// 屏幕坐标(起点和终点)
gun[i].svx = 0;
gun[i].svy = 0;
gun[i].evx = 0;
gun[i].evy = 0;
}
// 0
gun[0].dot_s = 0;
gun[0].dot_e = 4;
// 1
gun[1].dot_s = 1;
gun[1].dot_e = 4;
// 2
gun[2].dot_s = 2;
gun[2].dot_e = 4;
// 3
gun[3].dot_s = 3;
gun[3].dot_e = 4;
// 小棍初始化完成
}
//

stop();
// 原点坐标
ox = 200;
oy = 200;
// 取得点集
get_data(3);
// 小棍的起点,终点,深度计算
function gun_js() {
var i, a, b, ar, br, dxy, dxz;
var ax, ay, az, bx, by, bz, dx, dy, dz;
for (i=0; i<sm_gun; i++) {
a = gun[i].dot_s;
ar = dot[a].r;
ax = dot[a].x;
ay = dot[a].y;
az = dot[a].z;
//
b = gun[i].dot_e;
br = dot[b].r;
bx = dot[b].x;
by = dot[b].y;
bz = dot[b].z;
//
dx = bx-ax;
dy = by-ay;
dz = bz-az;
// dxy,dxz分别是a,b投影到xy,xz面上后的距离
dxy = Math.sqrt(dx*dx+dy*dy);
dxz = Math.sqrt(dx*dx+dz*dz);
// 绘图时的起点坐标
gun[i].sx = (dxy-br)*dx/dxy+ax;
gun[i].sy = (dxy-br)*dy/dxy+ay;
gun[i].sz = (dxz-br)*dz/dxz+az;
// 绘图时的终点坐标
gun[i].ex = -(dxy-ar)*dx/dxy+bx;
gun[i].ey = -(dxy-ar)*dy/dxy+by;
gun[i].ez = -(dxz-ar)*dz/dxz+bz;
// 小棍中点处的y值,用以比较深度
gun[i].oy = (ay+by)/2;
}
}
//
// 缩放函数，s为缩放系数
function scale(s) {
var i;
for (i=0; i<sm; i++) {
dot[i].x *= s;
dot[i].y *= s;
dot[i].z *= s;
}
}
// 物体旋转,xa,ya均为角度值
function rotate(xa, ya) {
var i, k;
var rad = Math.PI/180;
xa *= rad;
ya *= rad;
var sin_xa = Math.sin(xa);
var cos_xa = Math.cos(xa);
var sin_ya = Math.sin(ya);
var cos_ya = Math.cos(ya);
var px, py, pz, tempz;
for (i=0; i<sm; i++) {
px = dot[i].x;
py = dot[i].y;
pz = dot[i].z;
tempz = (py*cos_ya)-(px*sin_ya);
dot[i].x = (py*sin_ya)+(px*cos_ya);
dot[i].y = (pz*sin_xa)+(tempz*cos_xa);
dot[i].z = (pz*cos_xa)-(tempz*sin_xa);
}
}
// 将物体投影到xz平面，d为视点到投影面的距离
function v_xz(d) {
var i, k;
// 处理小球坐标
for (i=0; i<sm; i++) {
k = 1-dot[i].y/d;
dot[i].vx = dot[i].x/k;
dot[i].vy = -dot[i].z/k;
}
//
// 处理小棍坐标
for (i=0; i<sm_gun; i++) {
// 小棍起点
k = 1-gun[i].sy/d;
gun[i].svx = gun[i].sx/k;
gun[i].svy = -gun[i].sz/k;
// 小棍终点
k = 1-gun[i].ey/d;
gun[i].evx = gun[i].ex/k;
gun[i].evy = -gun[i].ez/k;
}
}
// 提取深度值，即y值(包括小球和小棍)
function get_deeps() {
var i, sm_all = sm+sm_gun;
deeps = new Array(sm);
// 提取小球的y值并记录其编号
for (i=0; i<sm; i++) {
deeps[i] = new Object();
deeps[i].num = i;
deeps[i].y = dot[i].y;
}
// 提取小棍的y值并记录其编号
for (i=sm; i<sm_all; i++) {
deeps[i] = new Object();
// 为节约空间,将小棍的编号+1000用以与小球相区分,而不再另作标记
deeps[i].num = (i-sm)+1000;
deeps[i].y = gun[i-sm].oy;
}
}
//
// 从最大深度开始，显示每个小球或小棍
function get_v() {
// 根据各小球坐标值计算棍的坐标值(包括起点和终点)
gun_js();
// 透视(将物体投影到xz平面,视点离zx面为200像素).
v_xz(200);
// 提取深度值，即y值，放入数组vdot中
get_deeps();
var i, a, j = 5;
var min_y, min_n, min_m;
// 当还有1个以上未显示时
while (deeps.length>0) {
// 先假设第一个就是最小y值(即最大深度)
min_y = deeps[0].y;
min_n = 0;
min_m = deeps[0].num;
// 找出未显示的球或棍中，y值最小的
for (i=1; i<deeps.length; i++) {
if (deeps[i].y<min_y) {
min_y = deeps[i].y;
min_n = i;
min_m = deeps[i].num;
}
}
// 显示找到的y值最小的球或棍(编号小于1000的都是球,否则就是棍)
if (min_m<1000) {
a = this.attachMovie("dot", "dot"+min_m, j++);
a._x = dot[min_m].vx+ox;
a._y = dot[min_m].vy+oy;
a._xscale = 100-(200-dot[min_m].y)/10;
a._yscale = a._xscale;
// 制造雾气效果
a.wuqi._alpha = (200-dot[min_m].y)/5;
// dot[i][5]保存的是颜色信息
a.gotoAndStop(dot[min_m].col);
} else {
min_m -= 1000;
// 创建一个空MC,并画一直线作为小棍
a = this.createEmptyMovieClip("gun"+min_m, j++);
a.lineStyle(3, 0xaaaaaa, 50);
a.moveTo((gun[min_m].svx+ox), (gun[min_m].svy+oy));
a.lineTo((gun[min_m].evx+ox), (gun[min_m].evy+oy));
}
// 从vdot中删去最小点,以便于下一轮寻找min点
deeps.splice(min_n, 1);
}
}
//
//
// 清除所有小球和小棍
function cl_all() {
var i,a;
for (i=0; i<sm; i++) {
a = this["dot"+i];
removeMovieClip(a);
}
for (i=0; i<sm_gun; i++) {
a = this["gun"+i];
removeMovieClip(a);
}
}
//
// 主调程序段:
this.onEnterFrame = function() {
// 绕x轴的转角
theta_x = (_ymouse-oy)/20;
// 绕z轴的转角
theta_z = (_xmouse-ox)/20;
// 旋转物体
rotate(theta_x, theta_z);
// 显示
get_v();
};
//