VoxeLibre/tools/create_texture__mcl_portals...

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Python
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import png
w, h = 16, 128;
s = [[int(0) for c in range(w)] for c in range(h)]
def drawpixel(x, y, t):
if (x >= 0) and (x < w) and (y >= 0) and (y < h):
if(t == 1):
s[y][x] = 1
elif t==2:
s[y][x] = 1 - s[y][x]
elif t==3:
s[y][x] = s[y][x] + 1
if s[y][x] > 3:
s[y][x] =s[y][x]-4
def circle(X1, Y1, R, t):
x = 0
y = R
delta = 1 - 2 * R
error = 0
while y >= 0:
if Y1%w + y < w:
drawpixel(X1 + x, Y1 + y, t)
if Y1%w - y >= 0:
drawpixel(X1 + x, Y1 - y, t)
if Y1%w + y < w:
drawpixel(X1 - x, Y1 + y, t)
if Y1%w - y >= 0:
drawpixel(X1 - x, Y1 - y, t)
error = 2 * (delta + y) - 1
if ((delta < 0) and (error <= 0)):
x = x + 1
delta = delta + 2 * x + 1
elif ((delta > 0) and (error > 0)):
y = y - 1
delta = delta - 2 * y + 1
else:
x = x + 1
y = y - 1
delta = delta + 2 * (x - y)
def line(y1, x1, y2, x2, v):
signx = 1
signy = 1
dx = x2 - x1
dy = y2 - y1
if dx < 0:
dx = - dx
signx = -1
if dy < 0:
dy = - dy
signy = -1
offsx = dx/2
offsy = dy/2
dir1 = 0
if dx >= dy:
dir1 = 1
for i in range(max(dx, dy)+1):
if(v == 1):
s[x1][y1] = 1
elif v==2:
s[x1][y1] = 1 - s[x1][y1]
elif v==3 or (v==4 and ((x1^y1)&1)) or (v==5 and (((x1|y1)&1)==0)) or (v==7 and ((((x1+1)|y1)&1)==0)) or (v==8 and ((((x1+1)|(y1+1))&1)==0)) or (v==6 and (((x1|(y1+1))&1)==0)):
s[x1][y1] = s[x1][y1] + 1
if s[x1][y1] > 3:
s[x1][y1] = s[x1][y1] - 4
if dir1 == 1:
x1 += signx
offsy += dy
if offsy >= dx:
y1 += signy
offsy -= dx
else:
y1 += signy
offsx += dx
if offsx >= dy:
x1 += signx
offsx -= dy
# R, G, B, Alpha (0xFF = opaque):
palette=[
(0x30,0x03,0xaf,0xa4),
(0x4f,0x1c,0xaf,0xb4),
(0x7f,0x3d,0xa0,0xc8),
(0x6d,0x5d,0x99,0xb1)
]
circles = h//w
maxr = w//2
for i in [1,2,3,5,9,10,11,13]:
for c in range(circles):
q = ((circles-c-1)+i)%w
circle(maxr, maxr+c*w, q, 3)
linesperside = 2
linestarts = round(w / linesperside) # 8
lineoffset = round(w / linestarts) # 2
wminus = w - 1
for j in range(linesperside):
for k in range(linestarts):
offset = k * w
for q in [0,1,3,4]:
# for q in [1]:
i = j*linestarts + ((k+q)%linestarts)
line(i, offset, wminus-i, offset+wminus, 5+(k&3))
line(wminus, offset+i, 0, offset+wminus-i, 5+(k&3))
w = png.Writer(len(s[0]), len(s), palette=palette, bitdepth=2)
f = open('mcl_portals_portal.png', 'wb')
w.write(f, s)