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scriptcraft/js-plugins/drone/sphere.js

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