Added parametric S hook demo
Joost Nieuwenhuijse
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<!DOCTYPE html>
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<html><head>
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<script src="lightgl.js"></script>
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<script src="csg.js"></script>
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<script src="openjscad.js"></script>
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<style>
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body {
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font: 14px/20px 'Helvetica Neue Light', HelveticaNeue-Light, 'Helvetica Neue', Helvetica, Arial, sans-serif;
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max-width: 820px;
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margin: 0 auto;
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padding: 10px;
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}
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pre, code, textarea {
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font: 12px/20px Monaco, monospace;
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border: 1px solid #CCC;
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border-radius: 3px;
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background: #F9F9F9;
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padding: 0 3px;
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color: #555;
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}
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pre, textarea {
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padding: 10px;
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width: 100%;
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}
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textarea {
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height: 200px;
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}
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textarea:focus {
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outline: none;
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}
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canvas { cursor: move; }
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</style>
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<link rel="stylesheet" href="openjscad.css" type="text/css">
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<script>
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var gProcessor=null;
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// Show all exceptions to the user:
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OpenJsCad.AlertUserOfUncaughtExceptions();
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function onload()
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{
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gProcessor = new OpenJsCad.Processor(document.getElementById("viewer"));
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updateSolid();
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}
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function updateSolid()
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{
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gProcessor.setJsCad(document.getElementById('code').value);
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}
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</script>
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<title>OpenJsCad demo: Parametric S hook</title>
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</head>
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<body onload="onload()">
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<h1>OpenJsCad demo: Parametric S hook</h1>
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<div id="viewer"></div>
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<h2>Source code</h2>
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Below is the OpenJsCad script for this demo. To build your own models, create a .jscad script
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and use the <a href="processfile.html"><b>OpenJsCad parser</b></a>. For more information see the
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<a href="index.html">OpenJsCad documentation</a>.
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<br><br>
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<textarea id="code">
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// Here we define the user editable parameters:
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function getParameterDefinitions() {
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return [
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{ name: 'topdiameter', caption: 'Inner diameter of top hook:', type: 'float', default: 10 },
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{ name: 'clampfactor', caption: 'Snugness of top hook (0 - 100):', type: 'float', default: 20 },
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{ name: 'cliplength', caption: 'Top hook clip length:', type: 'float', default: 5 },
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{ name: 'bottomdiameter', caption: 'Inner diameter of bottom hook:', type: 'float', default: 15 },
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{ name: 'height', caption: 'Outer height of the hook:', type: 'float', default: 50 },
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{ name: 'thickness', caption: 'Thickness:', type: 'float', default: 5 },
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{ name: 'width', caption: 'Width:', type: 'float', default: 10 },
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{
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name: 'rounded',
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type: 'choice',
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caption: 'Rounded edges',
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values: [0, 1],
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captions: ["No", "Yes (rendering will take a long time!)"],
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default: 0,
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},
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{ name: 'roundness', caption: 'Diameter of rounded edges (if enabled):', type: 'float', default: 1 },
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];
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}
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function main(params) {
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var pathresolution = 16;
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var expandresolution = 16;
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// construct the 2D path:
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var topradius = params.topdiameter/2;
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var bottomradius = params.bottomdiameter/2;
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var halfthickness = params.thickness/2;
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topradius += halfthickness;
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bottomradius += halfthickness;
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var roundness = params.roundness;
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if(params.rounded == 0)
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{
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roundness = 0;
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}
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roundness = Math.min(roundness, halfthickness-0.1, params.width/2-0.1);
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if(roundness < 0) roundness = 0;
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var clampfactor = params.clampfactor / 100;
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if(clampfactor < 0) clampfactor = 0;
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if(clampfactor >= 1) clampfactor = 1;
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clampfactor *= (topradius-halfthickness)/topradius;
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var topstartangle = - 180 * Math.acos(1 - 2*clampfactor) / Math.PI;
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var tophookcenter = new CSG.Vector2D(topradius, 0);
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var tophookstart = tophookcenter.plus(CSG.Vector2D.fromAngleDegrees(topstartangle).times(topradius));
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var circledistance = params.height - topradius - bottomradius - 2 * params.thickness;
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if(circledistance < 0) circledistance = 0;
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var bottomhookcenter = new CSG.Vector2D(-bottomradius, -circledistance);
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var gravityangle = 90 - tophookcenter.minus(bottomhookcenter).angleDegrees();
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var path = new CSG.Path2D();
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// top hook curve:
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if(params.cliplength > 0)
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{
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var clipstart = new CSG.Vector2D([0, -1]).times(params.cliplength).plus(tophookstart);
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path = path.appendPoint(clipstart);
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}
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var topcurvepath = CSG.Path2D.arc({
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center: tophookcenter,
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radius: topradius,
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startangle: topstartangle,
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endangle: 180,
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resolution: pathresolution,
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maketangent: true,
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});
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path = path.concat(topcurvepath);
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// straight middle part:
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if(circledistance > 0)
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{
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path = path.appendPoint([0, -circledistance]);
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}
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// bottom hook curve:
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var bottomcurvepath = CSG.Path2D.arc({
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center: bottomhookcenter,
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radius: bottomradius,
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startangle: 0,
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endangle: -180-gravityangle,
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resolution: pathresolution,
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maketangent: true,
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});
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path = path.concat(bottomcurvepath);
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// center around origin, and rotate as it would hang under gravity:
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var centerpoint = tophookcenter.plus(bottomhookcenter).times(0.5);
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var matrix = CSG.Matrix4x4.translation(centerpoint.negated().toVector3D(0));
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matrix = matrix.multiply(CSG.Matrix4x4.rotationZ(gravityangle));
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path = path.transform(matrix);
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// extrude the path to create a 3D solid
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var result = path.rectangularExtrude(2*(halfthickness-roundness), params.width-2*roundness, pathresolution, true);
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result = result.translate([0, 0, -params.width/2+roundness]);
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// expand to create rounded corners:
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if(roundness > 0)
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{
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result = result.expand(roundness, expandresolution);
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}
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return result;
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}</textarea><br>
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<input type="submit" value="Update" onclick="updateSolid(); return false;">
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<br><br>
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</body>
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</html>
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@ -115,7 +115,10 @@ Click and drag to rotate the model around the origin.<br>
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Shift+Drag moves the model around.<br>
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Alt+drag zooms (by changing the distance between camera and model).
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<h2>Demos</h2>
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Try the <a href="gearsdemo.html">Gears demo</a>!
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<ul>
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<li><a href="gearsdemo.html">Involute Gears</a></li>
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<li><a href="hookdemo.html">Parametric S hook</a></li>
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</ul>
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<h2>License</h2>
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Copyright (c) 2012 Joost Nieuwenhuijse.
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Uses CSG.js, <a href="https://github.com/evanw/csg.js">original</a> copyright (c) 2011 Evan Wallace,
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@ -435,6 +438,7 @@ var extruded=shape2d.extrude({
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twiststeps: 100 // create 100 slices
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});
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</pre>
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For an example of 2D shapes see the <a href="hookdemo.html">Parametric S hook</a> demo.
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<h2>2D Paths</h2>
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A path is simply a series of points, connected by lines. A path can be open or closed (an additional line
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@ -553,6 +557,7 @@ function main(params) {
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return result;
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}
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</pre>
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Or see the <a href="gearsdemo.html">Gears demo</a> for another example of interactive parameters.
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</body>
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</html>
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