590 lines
18 KiB
JavaScript
590 lines
18 KiB
JavaScript
OpenJsCad = function() {
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};
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// A viewer is a WebGL canvas that lets the user view a mesh. The user can
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// tumble it around by dragging the mouse.
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OpenJsCad.Viewer = function(containerelement, width, height, initialdepth) {
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try
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{
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var gl = GL.create();
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this.gl = gl;
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this.angleX = 0;
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this.angleY = 0;
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this.viewpointX = 0;
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this.viewpointY = 0;
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this.viewpointZ = initialdepth;
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// Draw triangle lines:
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this.drawLines = false;
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// Set to true so lines don't use the depth buffer
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this.lineOverlay = false;
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// Set up the viewport
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gl.canvas.width = width;
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gl.canvas.height = height;
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gl.viewport(0, 0, width, height);
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gl.matrixMode(gl.PROJECTION);
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gl.loadIdentity();
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gl.perspective(45, width / height, 0.5, 1000);
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gl.matrixMode(gl.MODELVIEW);
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// Set up WebGL state
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gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
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gl.clearColor(0.93, 0.93, 0.93, 1);
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gl.enable(gl.DEPTH_TEST);
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gl.enable(gl.CULL_FACE);
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gl.polygonOffset(1, 1);
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// Black shader for wireframe
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this.blackShader = new GL.Shader('\
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void main() {\
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gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\
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}\
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', '\
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void main() {\
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gl_FragColor = vec4(0.0, 0.0, 0.0, 0.1);\
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}\
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');
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// Shader with diffuse and specular lighting
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this.lightingShader = new GL.Shader('\
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varying vec3 color;\
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varying vec3 normal;\
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varying vec3 light;\
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void main() {\
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const vec3 lightDir = vec3(1.0, 2.0, 3.0) / 3.741657386773941;\
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light = lightDir;\
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color = gl_Color.rgb;\
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normal = gl_NormalMatrix * gl_Normal;\
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gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\
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}\
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', '\
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varying vec3 color;\
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varying vec3 normal;\
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varying vec3 light;\
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void main() {\
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vec3 n = normalize(normal);\
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float diffuse = max(0.0, dot(light, n));\
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float specular = pow(max(0.0, -reflect(light, n).z), 10.0) * sqrt(diffuse);\
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gl_FragColor = vec4(mix(color * (0.3 + 0.7 * diffuse), vec3(1.0), specular), 1.0);\
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}\
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');
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containerelement.appendChild(gl.canvas);
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var _this=this;
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gl.onmousemove = function(e) {
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_this.onMouseMove(e);
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};
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gl.ondraw = function() {
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_this.onDraw();
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};
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this.clear();
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}
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catch (e) {
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containerelement.innerHTML = "<b><br><br>Error: "+e.toString()+"</b><br><br>OpenJsCad currently requires Google Chrome with WebGL enabled";
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}
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};
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OpenJsCad.Viewer.prototype = {
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setCsg: function(csg) {
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this.mesh = OpenJsCad.Viewer.csgToMesh(csg);
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this.onDraw();
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},
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clear: function() {
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// empty mesh:
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this.mesh = new GL.Mesh();
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this.onDraw();
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},
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supported: function() {
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return !!this.gl;
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},
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onMouseMove: function(e) {
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if (e.dragging) {
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e.preventDefault();
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if(e.altKey)
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{
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var factor = 1e-2;
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this.viewpointZ *= Math.pow(2,factor * e.deltaY);
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}
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else if(e.shiftKey)
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{
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var factor = 5e-3;
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this.viewpointX += factor * e.deltaX * this.viewpointZ;
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this.viewpointY -= factor * e.deltaY * this.viewpointZ;
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}
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else
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{
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this.angleY += e.deltaX * 2;
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this.angleX += e.deltaY * 2;
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this.angleX = Math.max(-90, Math.min(90, this.angleX));
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}
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this.onDraw();
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}
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},
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onDraw: function(e) {
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var gl = this.gl;
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gl.makeCurrent();
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gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
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gl.loadIdentity();
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gl.translate(this.viewpointX, this.viewpointY, -this.viewpointZ);
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gl.rotate(this.angleX, 1, 0, 0);
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gl.rotate(this.angleY, 0, 1, 0);
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if (!this.lineOverlay) gl.enable(gl.POLYGON_OFFSET_FILL);
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this.lightingShader.draw(this.mesh, gl.TRIANGLES);
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if (!this.lineOverlay) gl.disable(gl.POLYGON_OFFSET_FILL);
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if(this.drawLines)
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{
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if (this.lineOverlay) gl.disable(gl.DEPTH_TEST);
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gl.enable(gl.BLEND);
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this.blackShader.draw(this.mesh, gl.LINES);
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gl.disable(gl.BLEND);
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if (this.lineOverlay) gl.enable(gl.DEPTH_TEST);
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}
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},
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}
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// Convert from CSG solid to GL.Mesh object
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OpenJsCad.Viewer.csgToMesh = function(csg) {
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var csg = csg.canonicalized();
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var mesh = new GL.Mesh({ normals: true, colors: true });
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var vertexTag2Index = {};
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var vertices = [];
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var colors = [];
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var triangles = [];
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// set to true if we want to use interpolated vertex normals
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// this creates nice round spheres but does not represent the shape of
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// the actual model
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var smoothlighting = false;
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var polygons = csg.toPolygons();
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var numpolygons = polygons.length;
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for(var polygonindex = 0; polygonindex < numpolygons; polygonindex++)
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{
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var polygon = polygons[polygonindex];
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var indices = polygon.vertices.map(function(vertex) {
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var vertextag = vertex.getTag();
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var vertexindex;
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if(smoothlighting && (vertextag in vertexTag2Index))
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{
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vertexindex = vertexTag2Index[vertextag];
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}
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else
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{
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vertexindex = vertices.length;
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vertexTag2Index[vertextag] = vertexindex;
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vertices.push([vertex.pos.x, vertex.pos.y, vertex.pos.z]);
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colors.push([0,0,1]);
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}
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return vertexindex;
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});
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for (var i = 2; i < indices.length; i++) {
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triangles.push([indices[0], indices[i - 1], indices[i]]);
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}
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}
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mesh.triangles = triangles;
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mesh.vertices = vertices;
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mesh.colors = colors;
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mesh.computeWireframe();
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mesh.computeNormals();
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return mesh;
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};
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// parse javascript into solid:
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OpenJsCad.javaScriptToSolid = function(script) {
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var csg = new Function(script)();
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if( (typeof(csg) != "object") || (!('polygons' in csg)))
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{
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throw new Error("Your javascript code should return a CSG object. Try for example: return CSG.cube();");
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}
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return csg;
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};
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// this is a bit of a hack; doesn't properly supports urls that start with '/'
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// but does handle relative urls containing ../
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OpenJsCad.makeAbsoluteUrl = function(url, baseurl) {
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if(!url.match(/^[a-z]+\:/i))
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{
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var basecomps = baseurl.split("/");
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if(basecomps.length > 0)
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{
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basecomps.splice(basecomps.length - 1, 1);
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}
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var urlcomps = url.split("/");
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var comps = basecomps.concat(urlcomps);
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var comps2 = [];
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comps.map(function(c) {
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if(c == "..")
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{
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if(comps2.length > 0)
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{
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comps2.splice(comps2.length - 1, 1);
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}
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}
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else
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{
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comps2.push(c);
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}
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});
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url = "";
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for(var i = 0; i < comps2.length; i++)
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{
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if(i > 0) url += "/";
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url += comps2[i];
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}
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}
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return url;
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};
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OpenJsCad.isChrome = function()
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{
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return (navigator.userAgent.search("Chrome") >= 0);
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}
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// callback: should be function(error, csg)
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OpenJsCad.javaScriptToSolidASync = function(script, callback) {
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var baselibraries = [
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"csg.js",
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"openjscad.js"
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];
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var baseurl = document.location + "";
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var workerscript = "";
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workerscript += script;
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workerscript += "\n//// END OF USER SUPPLIED SCRIPT\n";
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workerscript += "var _csg_libraries=" + JSON.stringify(baselibraries)+";\n";
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workerscript += "var _csg_baseurl=" + JSON.stringify(baseurl)+";\n";
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workerscript += "var _csg_makeAbsoluteURL=" + OpenJsCad.makeAbsoluteUrl.toString()+";\n";
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workerscript += "if(typeof(libs) == 'function') _csg_libraries = _csg_libraries.concat(libs());\n";
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workerscript += "_csg_libraries = _csg_libraries.map(function(l){return _csg_makeAbsoluteURL(l,_csg_baseurl);});\n";
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//workerscript += "importScripts.call(null, _csg_libraries);\n";
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workerscript += "_csg_libraries.map(function(l){importScripts(l)});\n";
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workerscript += "self.addEventListener('message', function(e) {if(e.data && e.data.cmd == 'render'){";
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workerscript += " if(typeof(main) != 'function') throw new Error('Your jscad file should contain a function main() which returns a CSG solid.');\n";
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workerscript += " var csg = main(); self.postMessage({cmd: 'rendered', csg: csg});";
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workerscript += "}},false);\n";
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var blobURL = OpenJsCad.textToBlobUrl(workerscript);
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if(!window.Worker) throw new Error("Your browser doesn't support Web Workers");
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var worker = new Worker(blobURL);
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worker.onmessage = function(e) {
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if(e.data && e.data.cmd == 'rendered')
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{
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var csg = CSG.fromObject(e.data.csg);
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callback(null, csg);
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}
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};
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worker.onerror = function(e) {
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var errtxt = "Error in line "+e.lineno+": "+e.message;
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callback(errtxt, null);
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};
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worker.postMessage({
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cmd: "render"
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}); // Start the worker.
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return worker;
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};
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OpenJsCad.textToBlobUrl = function(txt) {
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var bb;
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if(window.BlobBuilder) bb = new window.BlobBuilder()
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else if(window.WebKitBlobBuilder) bb = new window.WebKitBlobBuilder()
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else if(window.MozBlobBuilder) bb = new window.MozBlobBuilder()
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else throw new Error("Your browser doesn't support BlobBuilder");
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bb.append(txt);
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var blob = bb.getBlob();
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var blobURL;
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if(window.URL) blobURL = window.URL.createObjectURL(blob)
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else if(window.webkitURL) blobURL = window.webkitURL.createObjectURL(blob)
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else throw new Error("Your browser doesn't support window.URL");
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return blobURL;
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};
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OpenJsCad.revokeBlobUrl = function(url) {
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if(window.URL) window.URL.revokeObjectURL(url)
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else if(window.webkitURL) window.webkitURL.revokeObjectURL(url)
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else throw new Error("Your browser doesn't support window.URL");
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};
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OpenJsCad.Processor = function(containerdiv, onchange) {
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this.containerdiv = containerdiv;
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this.onchange = onchange;
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this.viewerdiv = null;
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this.viewer = null;
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this.viewerwidth = 800;
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this.viewerheight = 600;
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this.initialViewerDistance = 50;
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this.processing = false;
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this.solid = null;
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this.validcsg = false;
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this.hasstl = false;
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this.worker = null;
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this.createElements();
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};
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OpenJsCad.FileSystemApiErrorHandler = function(fileError, operation) {
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var errormap = {
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1: NOT_FOUND_ERR,
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2: SECURITY_ERR,
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3: ABORT_ERR,
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4: NOT_READABLE_ERR,
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5: ENCODING_ERR,
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6: NO_MODIFICATION_ALLOWED_ERR,
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7: INVALID_STATE_ERR,
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8: SYNTAX_ERR,
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9: INVALID_MODIFICATION_ERR,
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10: QUOTA_EXCEEDED_ERR,
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11: TYPE_MISMATCH_ERR,
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12: PATH_EXISTS_ERR,
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};
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var errname;
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if(fileError.code in errormap)
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{
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errname = errormap[fileError.code];
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}
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else
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{
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errname = "Error #"+fileError.code;
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}
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var errtxt = "FileSystem API error: "+operation+" returned error "+errname;
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throw new Error(errtxt);
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};
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OpenJsCad.AlertUserOfUncaughtExceptions = function() {
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window.onerror = function(message, url, line) {
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message = message.replace(/^Uncaught /i, "");
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alert(message+"\n\n("+url+" line "+line+")");
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};
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};
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OpenJsCad.Processor.prototype = {
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createElements: function() {
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while(this.containerdiv.children.length > 0)
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{
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this.containerdiv.removeChild(0);
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}
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if(!OpenJsCad.isChrome() )
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{
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var div = document.createElement("div");
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div.innerHTML = "Please note: OpenJsCad currently only runs reliably on Google Chrome!";
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this.containerdiv.appendChild(div);
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}
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var viewerdiv = document.createElement("div");
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viewerdiv.className = "viewer";
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viewerdiv.style.width = this.viewerwidth + "px";
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viewerdiv.style.height = this.viewerheight + "px";
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viewerdiv.style.backgroundColor = "rgb(200,200,200)";
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this.containerdiv.appendChild(viewerdiv);
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this.viewerdiv = viewerdiv;
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try
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{
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this.viewer = new OpenJsCad.Viewer(this.viewerdiv, this.viewerwidth, this.viewerheight, this.initialViewerDistance);
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} catch (e) {
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this.viewerdiv.innerHTML = e.toString();
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}
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this.errordiv = document.createElement("div");
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this.errordiv.style.display = "none";
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this.statusdiv = document.createElement("div");
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this.statusdiv.style.width = this.viewerwidth + "px";
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this.statusspan = document.createElement("span");
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this.statusbuttons = document.createElement("div");
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this.statusbuttons.style.float = "right";
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this.statusdiv.appendChild(this.statusspan);
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this.statusdiv.appendChild(this.statusbuttons);
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this.abortbutton = document.createElement("button");
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this.abortbutton.innerHTML = "Abort";
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var that = this;
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this.abortbutton.onclick = function(e) {
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that.abort();
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}
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this.statusbuttons.appendChild(this.abortbutton);
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this.generateStlButton = document.createElement("button");
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this.generateStlButton.innerHTML = "Generate STL";
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this.generateStlButton.onclick = function(e) {
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that.generateStl();
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}
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this.statusbuttons.appendChild(this.generateStlButton);
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this.downloadStlLink = document.createElement("a");
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this.downloadStlLink.innerHTML = "Download STL";
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this.statusbuttons.appendChild(this.downloadStlLink);
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this.enableItems();
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this.containerdiv.appendChild(this.statusdiv);
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this.containerdiv.appendChild(this.errordiv);
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this.clearViewer();
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},
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clearViewer: function() {
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this.clearStl();
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this.solid = new CSG();
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if(this.viewer)
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{
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this.viewer.setCsg(this.solid);
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}
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this.validcsg = false;
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this.enableItems();
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},
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abort: function() {
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if(this.processing)
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{
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//todo: abort
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this.processing=false;
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this.statusspan.innerHTML = "Aborted.";
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this.worker.terminate();
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this.enableItems();
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if(this.onchange) this.onchange();
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}
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},
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enableItems: function() {
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this.abortbutton.style.display = this.processing? "inline":"none";
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this.generateStlButton.style.display = ((!this.hasstl)&&(this.validcsg))? "inline":"none";
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this.downloadStlLink.style.display = this.hasstl? "inline":"none";
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},
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setError: function(txt) {
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this.errordiv.innerHTML = txt;
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this.errordiv.style.display = (txt == "")? "none":"block";
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},
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// script: javascript code
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// filename: optional, the name of the .jscad file
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setJsCad: function(script, filename) {
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if(!filename) filename = "openjscad.jscad";
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filename = filename.replace(/\.jscad$/i, "");
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this.abort();
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this.clearViewer();
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this.setError("");
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this.processing = true;
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this.statusspan.innerHTML = "Processing, please wait...";
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this.filename = filename;
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var that = this;
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this.worker = OpenJsCad.javaScriptToSolidASync(script, function(err, csg) {
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that.processing = false;
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that.worker = null;
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if(err)
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{
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that.setError(err);
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that.statusspan.innerHTML = "Error.";
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}
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else
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{
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that.solid = csg;
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if(that.viewer) that.viewer.setCsg(csg);
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that.validcsg = true;
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that.statusspan.innerHTML = "Ready.";
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}
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that.enableItems();
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if(that.onchange) that.onchange();
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});
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this.enableItems();
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if(this.onchange) this.onchange();
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},
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hasSolid: function() {
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return this.validcsg;
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},
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isProcessing: function() {
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return this.processing;
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},
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clearStl1: function() {
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if(this.hasstl)
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{
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this.hasstl = false;
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OpenJsCad.revokeBlobUrl(this.stlBlobUrl);
|
|
this.stlBlobUrl = null;
|
|
this.enableItems();
|
|
if(this.onchange) this.onchange();
|
|
}
|
|
},
|
|
|
|
generateStl1: function() {
|
|
this.clearStl();
|
|
if(this.validcsg)
|
|
{
|
|
var stltxt = this.solid.toStlString();
|
|
this.stlBlobUrl = OpenJsCad.textToBlobUrl(stltxt);
|
|
this.hasstl = true;
|
|
this.downloadStlLink.href = this.stlBlobUrl;
|
|
this.enableItems();
|
|
if(this.onchange) this.onchange();
|
|
}
|
|
},
|
|
|
|
clearStl: function() {
|
|
if(this.hasstl)
|
|
{
|
|
this.hasstl = false;
|
|
if(this.stlDirEntry)
|
|
{
|
|
this.stlDirEntry.removeRecursively();
|
|
this.stlDirEntry=null;
|
|
}
|
|
this.enableItems();
|
|
if(this.onchange) this.onchange();
|
|
}
|
|
},
|
|
|
|
generateStl: function() {
|
|
this.clearStl();
|
|
if(this.validcsg)
|
|
{
|
|
var stltxt = this.solid.toStlString();
|
|
window.requestFileSystem = window.requestFileSystem || window.webkitRequestFileSystem;
|
|
window.BlobBuilder = window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder;
|
|
if(!window.requestFileSystem)
|
|
{
|
|
throw new Error("Your browser does not support the HTML5 FileSystem API");
|
|
}
|
|
if(!window.BlobBuilder)
|
|
{
|
|
throw new Error("Your browser does not support the HTML5 BlobBuilder API");
|
|
}
|
|
// create a random directory name:
|
|
var dirname = "OpenJsCadStlOutput_"+parseInt(Math.random()*1000000000, 10)+".stl";
|
|
var filename = this.filename+".stl";
|
|
var that = this;
|
|
window.requestFileSystem(TEMPORARY, 20*1024*1024, function(fs){
|
|
fs.root.getDirectory(dirname, {create: true, exclusive: true}, function(dirEntry) {
|
|
that.stlDirEntry = dirEntry;
|
|
dirEntry.getFile(filename, {create: true, exclusive: true}, function(fileEntry) {
|
|
fileEntry.createWriter(function(fileWriter) {
|
|
fileWriter.onwriteend = function(e) {
|
|
that.hasstl = true;
|
|
that.downloadStlLink.href = fileEntry.toURL();
|
|
that.enableItems();
|
|
if(that.onchange) that.onchange();
|
|
};
|
|
fileWriter.onerror = function(e) {
|
|
throw new Error('Write failed: ' + e.toString());
|
|
};
|
|
// Create a new Blob and write it to log.txt.
|
|
var bb = new window.BlobBuilder(); // Note: window.WebKitBlobBuilder in Chrome 12.
|
|
bb.append(stltxt);
|
|
fileWriter.write(bb.getBlob());
|
|
},
|
|
function(fileerror){OpenJsCad.FileSystemApiErrorHandler(fileerror, "createWriter");}
|
|
);
|
|
},
|
|
function(fileerror){OpenJsCad.FileSystemApiErrorHandler(fileerror, "getFile('"+filename+"')");}
|
|
);
|
|
},
|
|
function(fileerror){OpenJsCad.FileSystemApiErrorHandler(fileerror, "getDirectory('"+dirname+"')");}
|
|
);
|
|
},
|
|
function(fileerror){OpenJsCad.FileSystemApiErrorHandler(fileerror, "requestFileSystem");}
|
|
);
|
|
}
|
|
},
|
|
|
|
|
|
}; |