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