54 lines
1.5 KiB
JavaScript
54 lines
1.5 KiB
JavaScript
Drone.extend('sphere', function(block,radius)
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{
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var lastRadius = radius;
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var slices = [[radius,0]];
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var diameter = radius*2;
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var r2 = radius*radius;
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for (var i = 0; i <= radius;i++){
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var newRadius = Math.round(Math.sqrt(r2 - i*i));
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if (newRadius == lastRadius)
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slices[slices.length-1][1]++;
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else
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slices.push([newRadius,1]);
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lastRadius = newRadius;
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}
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this.chkpt('sphere');
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//
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// mid section
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//
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this.up(radius - slices[0][1])
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.cylinder(block,radius,(slices[0][1]*2)-1)
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.down(radius-slices[0][1]);
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var yOffset = -1;
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for (var i = 1; i < slices.length;i++)
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{
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yOffset += slices[i-1][1];
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var sr = slices[i][0];
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var sh = slices[i][1];
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var v = radius + yOffset, h = radius-sr;
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// northern hemisphere
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this.up(v).fwd(h).right(h)
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.cylinder(block,sr,sh)
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.left(h).back(h).down(v);
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// southern hemisphere
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v = radius - (yOffset+sh+1);
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this.up(v).fwd(h).right(h)
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.cylinder(block,sr,sh)
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.left(h).back(h). down(v);
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}
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return this.move('sphere');
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});
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//
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// sphere0 creates an empty sphere but the code needs work
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// - there are gaps in the sphere due to rasterization.
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//
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Drone.extend('sphere0', function(block,radius)
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{
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return this.sphere(block,radius)
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.fwd().right().up()
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.sphere(0,radius-1)
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.back().left().down();
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});
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