Created
August 14, 2011 01:27
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cube graphics in nodebox with hidden surface removal
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""" | |
classes for vertex, rectangle | |
""" | |
class Vertex(object): | |
def __init__(self, x, y, z): | |
self.x = x | |
self.y = y | |
self.z = z | |
def __add__(self, other): | |
if isinstance(other, Vertex): | |
x, y, z = other.x, other.y, other.z | |
elif isinstance(other, tuple) or isinstance(other, list): | |
x, y, z = other | |
self.x += other.x | |
self.y += other.y | |
self.z += other.z | |
def __mul__(self, n): | |
self.x *= n | |
self.y *= n | |
self.z *= n | |
V = Vertex | |
class Polygon(object): | |
def __init__(self, *args): | |
if not args: | |
self.verts = [] | |
else: | |
self.verts = args | |
def add_vertex(self, v): | |
self.verts.append(v) | |
def __getitem__(self, n): | |
return self.verts[n] | |
def __len__(self): | |
return len(self.verts) | |
def surface_normal(self): | |
v0, v1, v2 = self.verts[0:3] | |
return v1.x * (v2.y - v0.y) + v0.x * (v1.y - v2.y) + v2.x * (v0.y - v1.y) | |
R = Polygon | |
""" | |
main | |
""" | |
from math import sin, cos, pi | |
rad = pi / 180.0 | |
L = 80 | |
cube = [ | |
R(V(0, L, 0), V(L, L, 0), V(L, 0, 0), V(0, 0, 0)), | |
R(V(L, L, 0), V(L, L, L), V(L, 0, L), V(L, 0, 0)), | |
R(V(0, L, L), V(L, L, L), V(L, L, 0), V(0, L, 0)), | |
R(V(0, L, L), V(0, L, 0), V(0, 0, 0), V(0, 0, L)), | |
R(V(L, 0, L), V(0, 0, L), V(0, 0, 0), V(L, 0, 0)), | |
R(V(L, L, L), V(0, L, L), V(0, 0, L), V(L, 0, L)), | |
] | |
size = (360, 360) | |
speed(60) | |
def setup(): | |
global a, b | |
a, b = 0, rad * 0.3 | |
def draw(): | |
global a, b | |
a = (a + 0.02) % (2 * pi) | |
b = (b + 0.01) % (2 * pi) | |
translate(180, 180) | |
fill(0.7, 0.7, 1) | |
stroke(0, 0, 0) | |
for r in cube: | |
draw_rect(r, a, b) | |
def draw_rect(r, a, b): | |
moved_rect = Polygon() | |
for v in r: | |
x = v.x * cos(b) + v.z * sin(b) | |
z = -v.x * sin(b) + v.z * cos(b) | |
y = v.y * cos(a) - z * sin(a) | |
moved_rect.add_vertex(V(x, y, z)) | |
if moved_rect.surface_normal() < 0: | |
return | |
for i, v in enumerate(moved_rect): | |
if i == 0: | |
beginpath(v.x, v.y) | |
lineto(v.x, v.y) | |
if i == (len(r) - 1): | |
endpath() |
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