38 lines
1.8 KiB
JavaScript
38 lines
1.8 KiB
JavaScript
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dojo.provide("dojox.gfx3d.gradient");
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dojo.require("dojox.gfx3d.vector");
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dojo.require("dojox.gfx3d.matrix");
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(function(){
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var dist = function(a, b){ return Math.sqrt(Math.pow(b.x - a.x, 2) + Math.pow(b.y - a.y, 2)); };
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var N = 32;
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dojox.gfx3d.gradient = function(model, material, center, radius, from, to, matrix){
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// summary: calculate a cylindrical gradient
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// model: dojox.gfx3d.lighting.Model: color model
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// material: Object: defines visual properties
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// center: Object: center of the cylinder's bottom
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// radius: Number: radius of the cylinder
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// from: Number: from position in radians
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// to: Number: from position in radians
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// matrix: dojox.gfx3d.Matrix3D: the cumulative transformation matrix
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// tolerance: Number: tolerable diffirence in colors between gradient steps
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var m = dojox.gfx3d.matrix, v = dojox.gfx3d.vector, mx = m.normalize(matrix),
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f = m.multiplyPoint(mx, radius * Math.cos(from) + center.x, radius * Math.sin(from) + center.y, center.z),
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t = m.multiplyPoint(mx, radius * Math.cos(to) + center.x, radius * Math.sin(to) + center.y, center.z),
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c = m.multiplyPoint(mx, center.x, center.y, center.z), step = (to - from) / N, r = dist(f, t) / 2,
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mod = model[material.type], fin = material.finish, pmt = material.color,
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colors = [{offset: 0, color: mod.call(model, v.substract(f, c), fin, pmt)}];
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for(var a = from + step; a < to; a += step){
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var p = m.multiplyPoint(mx, radius * Math.cos(a) + center.x, radius * Math.sin(a) + center.y, center.z),
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df = dist(f, p), dt = dist(t, p);
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colors.push({offset: df / (df + dt), color: mod.call(model, v.substract(p, c), fin, pmt)});
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}
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colors.push({offset: 1, color: mod.call(model, v.substract(t, c), fin, pmt)});
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return {type: "linear", x1: 0, y1: -r, x2: 0, y2: r, colors: colors};
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};
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})();
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