Generate rainbow shape as voxel in json for VoxelEditor https://github.com/perfume-dev/VoxelEditor

gen-rainbow.py

#!/usr/bin/env python
import json
import colorsys
import math

def hsv(h, s, v):
    r, g, b = colorsys.hsv_to_rgb(h, s, v)
    return (int(r*255)*256 + int(g*255))*256 + int(b*255)

arr = []
z = 0
for x in range(0, 80):
    for y in range(0, 40):
        r = math.sqrt((x - 40)**2 + (y+1)**2)
        if r < 31 or r > 40:
            continue
        h = (39 - r) / 10
        if h < 0:
            h = 0
        v = {
                "color": hsv(h, 1, 1),
                "d": 10,
                "h": 1,
                "id": 0,
                "w": 1,
                "x": x,
                "y": y,
                "z": z 
            }
        arr.append(v)

voxel = {"metadata": "",
         "updatedAt": 1410876497,
         "version": 1,
         "voxels": arr
        }

print json.dumps(voxel, sort_keys=True, indent=4)