27 lines
718 B
JavaScript
27 lines
718 B
JavaScript
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var Sphere = {};
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Sphere.volume = function(r) { return Math.pi*r*r*r*4/3; };
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Sphere.random = function(r,theta,phi)
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{
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if (typeof r === 'number') r = [r,r];
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theta ??= [0,1];
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phi ??= [-0.5,0.5];
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if (typeof theta === 'number') theta = [theta,theta];
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if (typeof phi === 'number') phi = [phi,phi];
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var ra = Math.random_range(r[0],r[1]);
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var ta = Math.turn2rad(Math.random_range(theta[0],theta[1]));
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var pa = Math.turn2rad(Math.random_range(phi[0],phi[1]));
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return [
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ra*Math.sin(ta)*Math.cos(pa),
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ra*Math.sin(ta)*Math.sin(pa),
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ra*Math.cos(ta)
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];
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}
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var Circle = {};
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Circle.area = function(r) { return Math.pi*r*r; };
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Circle.random = function(r,theta)
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{
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return Sphere.random(r,theta).xz;
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}
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