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         sub: function(a, b) {
  27                 return [a[0] - b[0],
  28                         a[1] - b[1],
  29                         a[2] - b[2]];
  30         },
  31         cross: function(a, b) {
  32                 return [a[1]*b[2] - a[2]*b[1],
  33                         a[2]*b[0] - a[0]*b[2],
  34                         a[0]*b[1] - a[1]*b[0]];
  35         },
  36         normal: function(a, b, c) {
  37                 return this.cross(this.sub(a, b), this.sub(b, c));
  38         },
  39         go: function() {
  40                 // Get params from form
  41                 var params = [];
  42                 for (var i = 0; i < this.user_params.length; i++) {
  43                         params[i] = this.form.elements["param"+i].value;
  44                 }
  45
  46                 // Run user_function
  47                 this.points = this.user_function.apply(null, params);
  48                 if (this.points.length % 3 != 0) {
  49                         alert("Points list length not divisble by 3!");
  50                 }
  51                 var n = this.points.length / 3;
  52
  53                 // Make STL
  54                 this.stl = "solid " + this.user_function.name + "\n";
  55                 for (var i = 0; i < n; i++) {
  56                         var a = this.points[i*3+0];
  57                         var b = this.points[i*3+1];
  58                         var c = this.points[i*3+2];
  59                         var normal = this.normal(a, b, c);
  60                         this.stl += "facet normal " + normal[0] + " " + normal[1] + " " + normal[2] + "\n" +
  61                                 "outer loop\n" +
  62                                 "vertex " + a[0] + " " + a[1] + " " + a[2] + "\n"+
  63                                 "vertex " + b[0] + " " + b[1] + " " + b[2] + "\n"+
  64                                 "vertex " + c[0] + " " + c[1] + " " + c[2] + "\n"+
  65                                 "endloop\n" +
  66                                 "endfacet\n";
  67                 }
  68                 this.stl += "endsolid " + this.user_function.name + "\n";
  69
  70                 // Remove any previous download links
  71                 var old_download_link = document.getElementById("nt3d_download");
  72                 if (old_download_link) {
  73                         old_download_link.parentNode.removeChild(old_download_link);
  74                 }
  75
  76                 // Offer result as download
  77                 var download_link = document.createElement("a");
  78                 download_link.appendChild(document.createTextNode("Download!"));
  79                 download_link.setAttribute("id", "nt3d_download");
  80                 download_link.setAttribute("download", this.user_function.name + ".stl");
  81                 download_link.setAttribute("href", "data:application/sla," + encodeURIComponent(this.stl));
  82                 this.ui.appendChild(download_link);
  83         },
  84         framework: function (f, params) {
  85                 this.user_function = f;
  86                 this.user_params = params;
  87
  88                 // Make the UI
  89                 this.ui = document.getElementById("nt3dui");
  90                 if (!this.ui) {
  91                         this.ui = document.createElement("div");
  92                         this.ui.setAttribute("id", "nt3dui");
  93                         document.body.appendChild(this.ui);
  94                 }
  95                 this.form = document.createElement("form");
  96                 this.ui.appendChild(this.form);
  97                 var table = document.createElement("table");
  98                 this.form.appendChild(table);
  99                 var tr = document.createElement("tr");
 100                 table.appendChild(tr);
 101                 var th = document.createElement("th");
 102                 th.appendChild(document.createTextNode("Variable"));
 103                 tr.appendChild(th);
 104                 th = document.createElement("th");
 105                 th.appendChild(document.createTextNode("Value"));
 106                 tr.appendChild(th);
 107                 for (var i = 0; i < params.length; i++) {
 108                         tr = document.createElement("tr");
 109                         table.appendChild(tr);
 110                         var td = document.createElement("td");
 111                         td.appendChild(document.createTextNode(params[i][0]));
 112                         tr.appendChild(td);
 113                         td = document.createElement("td");
 114                         var input = document.createElement("input");
 115                         input.setAttribute("name", "param" + i);
 116                         input.setAttribute("value", params[i][1]);
 117                         td.appendChild(input);
 118                         tr.appendChild(td);
 119                 }
 120                 var go = document.createElement("input");
 121                 go.setAttribute("type", "button");
 122                 go.setAttribute("value", "Go!");
 123                 go.setAttribute("onclick", "nt3d.go()");
 124                 this.form.appendChild(go);
 125         }
 126 };