bezier tinkering program OpenJSCAD

tinkerablebeziers.jscad

// title      : OpenJSCAD Example
// author     : Natalie Freed

function getParameterDefinitions() {
	var parameters = [{ name: 'numCurves', type: 'int', initial: 2, caption: "num curves:" }];
	parameters = parameters.concat(makeSliders(1));
    return parameters;
}

function main(params) {
  var shape = new CSG.Path2D([ [params.x1,params.y1] ], false);
  shape = shape.appendBezier([ [params.ax1, params.ay1], [params.bx1, params.by1], [params.x2, params.y2] ]);
  shape = shape.appendBezier([ [params.ax2, params.ay2], [params.bx2, params.by2], [params.x3, params.y3] ]);
  shape = shape.close();
  
  shape = shape.innerToCAG();
  shape = shape.extrude({offset: [0,0,10]});

  var pointSpheres = [];
  var points = Object.keys(params).map(function(key) {
    return params[key];
  });
  for(var i=1;i<points.length;i+=2) {
  	pointSpheres.push(CSG.cylinder({start: [points[i], points[i+1], 0], end: [points[i], points[i+1], 20], radius: 2}).setColor([50/255, 100/255, 220/255]));
  }
  pointSpheres = union(pointSpheres);

  return [shape, pointSpheres];
}

function slider(name, initial) {
  	return { name: name, caption: name, type: 'slider', initial: initial, min: -200, max: 200 };
}

function makeSliders(num) {
	return [slider('x1', 0),
    		slider('y1', -60),
    		slider('ax1', -93),
    		slider('ay1', -132),
    		slider('bx1', -114),
    		slider('by1', 34),
    		slider('x2', 2),
    		slider('y2', 63),
    		slider('ax2', 127),
    		slider('ay2', 14),
    		slider('bx2', 75),
    		slider('by2', -135),
    		slider('x3', 0),
    		slider('y3', -60)];
}