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         closed_trianglefan: function(fan) {
  34                 return nt3d.trianglefan(fan.concat([fan[1]]));
  35         },
  36         quadstrip: function(strip) {
  37                 if (strip.length % 2 != 0) {
  38                         alert("quadstrip length not divisble by 2!");
  39                 }
  40                 var result = [];
  41                 for (var i = 2; i < strip.length; i += 2) {
  42                         result = result.concat(nt3d.quad(strip[i-2], strip[i-1], strip[i+1], strip[i]));
  43                 }
  44                 return result;
  45         },
  46         closed_quadstrip: function(strip) {
  47                 return nt3d.quadstrip(strip.concat([strip[0], strip[1]]));
  48         },
  49         sub: function(a, b) {
  50                 return [a[0] - b[0],
  51                         a[1] - b[1],
  52                         a[2] - b[2]];
  53         },
  54         cross: function(a, b) {
  55                 return [a[1]*b[2] - a[2]*b[1],
  56                         a[2]*b[0] - a[0]*b[2],
  57                         a[0]*b[1] - a[1]*b[0]];
  58         },
  59         normal: function(a, b, c) {
  60                 return this.cross(this.sub(a, b), this.sub(b, c));
  61         },
  62         go: function() {
  63                 // Get params from form
  64                 var params = [];
  65                 for (var i = 0; i < this.user_params.length; i++) {
  66                         params[i] = this.form.elements["param"+i].value;
  67                 }
  68
  69                 // Run user_function
  70                 this.points = this.user_function.apply(null, params);
  71                 if (this.points.length % 3 != 0) {
  72                         alert("Points list length not divisble by 3!");
  73                 }
  74                 var n = this.points.length / 3;
  75
  76                 // Make STL
  77                 this.stl = "solid " + this.user_function.name + "\n";
  78                 for (var i = 0; i < n; i++) {
  79                         var a = this.points[i*3+0];
  80                         var b = this.points[i*3+1];
  81                         var c = this.points[i*3+2];
  82                         var normal = this.normal(a, b, c);
  83                         this.stl += "facet normal " + normal[0] + " " + normal[1] + " " + normal[2] + "\n" +
  84                                 "outer loop\n" +
  85                                 "vertex " + a[0] + " " + a[1] + " " + a[2] + "\n"+
  86                                 "vertex " + b[0] + " " + b[1] + " " + b[2] + "\n"+
  87                                 "vertex " + c[0] + " " + c[1] + " " + c[2] + "\n"+
  88                                 "endloop\n" +
  89                                 "endfacet\n";
  90                 }
  91                 this.stl += "endsolid " + this.user_function.name + "\n";
  92
  93                 // Remove any previous download links
  94                 var old_download_link = document.getElementById("nt3d_download");
  95                 if (old_download_link) {
  96                         old_download_link.parentNode.removeChild(old_download_link);
  97                 }
  98
  99                 // Offer result as download
 100                 var download_link = document.createElement("a");
 101                 download_link.appendChild(document.createTextNode("Download!"));
 102                 download_link.setAttribute("id", "nt3d_download");
 103                 download_link.setAttribute("style", "background-color: blue");
 104                 download_link.setAttribute("download", this.user_function.name + ".stl");
 105                 download_link.setAttribute("href", "data:application/sla," + encodeURIComponent(this.stl));
 106                 this.ui.appendChild(download_link);
 107                 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);
 108         },
 109         framework: function (f, params) {
 110                 this.user_function = f;
 111                 this.user_params = params;
 112
 113                 // Make the UI
 114                 this.ui = document.getElementById("nt3dui");
 115                 if (!this.ui) {
 116                         this.ui = document.createElement("div");
 117                         this.ui.setAttribute("id", "nt3dui");
 118                         document.body.appendChild(this.ui);
 119                 }
 120                 this.form = document.createElement("form");
 121                 this.form.setAttribute("onsubmit", "nt3d.go(); return false");
 122                 this.ui.appendChild(this.form);
 123                 var table = document.createElement("table");
 124                 this.form.appendChild(table);
 125                 var tr = document.createElement("tr");
 126                 table.appendChild(tr);
 127                 var th = document.createElement("th");
 128                 th.appendChild(document.createTextNode("Variable"));
 129                 tr.appendChild(th);
 130                 th = document.createElement("th");
 131                 th.appendChild(document.createTextNode("Value"));
 132                 tr.appendChild(th);
 133                 for (var i = 0; i < params.length; i++) {
 134                         tr = document.createElement("tr");
 135                         table.appendChild(tr);
 136                         var td = document.createElement("td");
 137                         td.appendChild(document.createTextNode(params[i][0]));
 138                         tr.appendChild(td);
 139                         td = document.createElement("td");
 140                         var input = document.createElement("input");
 141                         input.setAttribute("name", "param" + i);
 142                         input.setAttribute("value", params[i][1]);
 143                         td.appendChild(input);
 144                         tr.appendChild(td);
 145                 }
 146                 var go = document.createElement("input");
 147                 go.setAttribute("type", "button");
 148                 go.setAttribute("value", "Go!");
 149                 go.setAttribute("onclick", "nt3d.go()");
 150                 this.form.appendChild(go);
 151         }
 152 };