git.scottworley.com Git - nt3d/blob - nt3d.js

   1 /* nt3d - Javascript library for doing some 3D stuff.
   2  * Copyright (C) 2012  Scott Worley <ScottWorley@ScottWorley.com>
   3  *
   4  *  This program is free software: you can redistribute it and/or modify
   5  *  it under the terms of the GNU Affero General Public License as
   6  *  published by the Free Software Foundation, either version 3 of the
   7  *  License, or (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU Affero General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU Affero General Public License
  15  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 nt3d = {
  19         triangle: function(a, b, c) {
  20                 return [a, b, c];
  21         },
  22         quad: function(a, b, c, d) {
  23                 return this.triangle(a, b, c).concat(
  24                        this.triangle(c, d, a));
  25         },
  26         trianglefan: function(fan) {
  27                 var result = [];
  28                 for (var i = 2; i < fan.length; i++) {
  29                         result.push(fan[0], fan[i-1], fan[i]);
  30                 }
  31                 return result;
  32         },
  33         quadstrip: function(strip) {
  34                 if (strip.length % 2 != 0) {
  35                         alert("quadstrip length not divisble by 2!");
  36                 }
  37                 var result = [];
  38                 for (var i = 2; i < strip.length; i += 2) {
  39                         result = result.concat(nt3d.quad(strip[i-2], strip[i-1], strip[i+1], strip[i]));
  40                 }
  41                 return result;
  42         },
  43         closed_quadstrip: function(strip) {
  44                 return nt3d.quadstrip(strip.concat([strip[0], strip[1]]));
  45         },
  46         sub: function(a, b) {
  47                 return [a[0] - b[0],
  48                         a[1] - b[1],
  49                         a[2] - b[2]];
  50         },
  51         cross: function(a, b) {
  52                 return [a[1]*b[2] - a[2]*b[1],
  53                         a[2]*b[0] - a[0]*b[2],
  54                         a[0]*b[1] - a[1]*b[0]];
  55         },
  56         normal: function(a, b, c) {
  57                 return this.cross(this.sub(a, b), this.sub(b, c));
  58         },
  59         go: function() {
  60                 // Get params from form
  61                 var params = [];
  62                 for (var i = 0; i < this.user_params.length; i++) {
  63                         params[i] = this.form.elements["param"+i].value;
  64                 }
  65
  66                 // Run user_function
  67                 this.points = this.user_function.apply(null, params);
  68                 if (this.points.length % 3 != 0) {
  69                         alert("Points list length not divisble by 3!");
  70                 }
  71                 var n = this.points.length / 3;
  72
  73                 // Make STL
  74                 this.stl = "solid " + this.user_function.name + "\n";
  75                 for (var i = 0; i < n; i++) {
  76                         var a = this.points[i*3+0];
  77                         var b = this.points[i*3+1];
  78                         var c = this.points[i*3+2];
  79                         var normal = this.normal(a, b, c);
  80                         this.stl += "facet normal " + normal[0] + " " + normal[1] + " " + normal[2] + "\n" +
  81                                 "outer loop\n" +
  82                                 "vertex " + a[0] + " " + a[1] + " " + a[2] + "\n"+
  83                                 "vertex " + b[0] + " " + b[1] + " " + b[2] + "\n"+
  84                                 "vertex " + c[0] + " " + c[1] + " " + c[2] + "\n"+
  85                                 "endloop\n" +
  86                                 "endfacet\n";
  87                 }
  88                 this.stl += "endsolid " + this.user_function.name + "\n";
  89
  90                 // Remove any previous download links
  91                 var old_download_link = document.getElementById("nt3d_download");
  92                 if (old_download_link) {
  93                         old_download_link.parentNode.removeChild(old_download_link);
  94                 }
  95
  96                 // Offer result as download
  97                 var download_link = document.createElement("a");
  98                 download_link.appendChild(document.createTextNode("Download!"));
  99                 download_link.setAttribute("id", "nt3d_download");
 100                 download_link.setAttribute("style", "background-color: blue");
 101                 download_link.setAttribute("download", this.user_function.name + ".stl");
 102                 download_link.setAttribute("href", "data:application/sla," + encodeURIComponent(this.stl));
 103                 this.ui.appendChild(download_link);
 104                 setTimeout(function() { download_link.setAttribute("style", "-webkit-transition: background-color 0.4s; -moz-transition: background-color 0.4s; -o-transition: background-color 0.4s; -ms-transition: background-color 0.4s; transition: background-color 0.4s; background-color: inherit"); }, 0);
 105         },
 106         framework: function (f, params) {
 107                 this.user_function = f;
 108                 this.user_params = params;
 109
 110                 // Make the UI
 111                 this.ui = document.getElementById("nt3dui");
 112                 if (!this.ui) {
 113                         this.ui = document.createElement("div");
 114                         this.ui.setAttribute("id", "nt3dui");
 115                         document.body.appendChild(this.ui);
 116                 }
 117                 this.form = document.createElement("form");
 118                 this.form.setAttribute("onsubmit", "nt3d.go(); return false");
 119                 this.ui.appendChild(this.form);
 120                 var table = document.createElement("table");
 121                 this.form.appendChild(table);
 122                 var tr = document.createElement("tr");
 123                 table.appendChild(tr);
 124                 var th = document.createElement("th");
 125                 th.appendChild(document.createTextNode("Variable"));
 126                 tr.appendChild(th);
 127                 th = document.createElement("th");
 128                 th.appendChild(document.createTextNode("Value"));
 129                 tr.appendChild(th);
 130                 for (var i = 0; i < params.length; i++) {
 131                         tr = document.createElement("tr");
 132                         table.appendChild(tr);
 133                         var td = document.createElement("td");
 134                         td.appendChild(document.createTextNode(params[i][0]));
 135                         tr.appendChild(td);
 136                         td = document.createElement("td");
 137                         var input = document.createElement("input");
 138                         input.setAttribute("name", "param" + i);
 139                         input.setAttribute("value", params[i][1]);
 140                         td.appendChild(input);
 141                         tr.appendChild(td);
 142                 }
 143                 var go = document.createElement("input");
 144                 go.setAttribute("type", "button");
 145                 go.setAttribute("value", "Go!");
 146                 go.setAttribute("onclick", "nt3d.go()");
 147                 this.form.appendChild(go);
 148         }
 149 };