def __init__(self, location, size, h_range):
self.hrange1, self.hrange2 = h_range
self.mu = float(self.hrange2 + self.hrange1)/2
#print self.mu
self.sigma = float(self.hrange2 - self.mu) / 2
#print self.sigma
self.x, self.y = location
self.width = size[0]
self.height = size[1]
self.heights = []
for r in range(self.height):
self.heights.append([0] * self.width)
self.current_roughness = ROUGHNESS
self.erode = ErodeLandscape()
class DiamondSquare:
def __init__(self, location, size, h_range):
self.hrange1, self.hrange2 = h_range
self.mu = float(self.hrange2 + self.hrange1)/2
#print self.mu
self.sigma = float(self.hrange2 - self.mu) / 2
#print self.sigma
self.x, self.y = location
self.width = size[0]
self.height = size[1]
self.heights = []
for r in range(self.height):
self.heights.append([0] * self.width)
self.current_roughness = ROUGHNESS
self.erode = ErodeLandscape()
def __getitem__(self, xy):
x, y = xy
return self.heights[x][y]
def __setitem__(self, xy, value):
x, y = xy
self.heights[x][y] = value
def __len__(self):
return self.width
def get_random_height(self):
'''Get a completely random height'''
perc = random.random()
return int(max(min(random.gauss(self.mu, self.sigma), 255), 0))
#return random.randrange(self.hrange1, self.hrange2)
def get_noise(self, roughness):
'''Get a random number between -roughness and roughness
and use that to scale based on the HEIGHT_RANGE'''
return random.gauss(0, roughness*float(self.hrange2)/2)
#return random.uniform(-roughness, roughness) * self.hrange2
def average(self, *args):
'''Average a bunch of numbers.'''
total = 0.0
for value in args:
total += value
return total / len(args)
def set_new_heights(self, start_row, start_col, square_size, roughness):
'''Calculate new middle and edge-middle heights.
Each new height is offset by a random amount of noise.'''
midpoint_y = start_row + (square_size / 2)
midpoint_x = start_col + (square_size / 2)
end_row = start_row + square_size
end_col = start_col + square_size
a = self[(start_col, start_row)]
b = self[(end_col, start_row)]
c = self[(start_col, end_row)]
d = self[(end_col, end_row)]
self[(midpoint_x, midpoint_y)] = self.average(a, b, c, d) + self.get_noise(roughness)
e = self[(midpoint_x, midpoint_y)]
if self[(midpoint_x, start_row)] == 0:
self[(midpoint_x, start_row)] = self.average(a, b, e) + self.get_noise(roughness)
if self[(midpoint_x, end_row)] == 0:
self[(midpoint_x, end_row)] = self.average(c, d, e) + self.get_noise(roughness)
if self[(start_col, midpoint_y)] == 0:
self[(start_col, midpoint_y)] = self.average(a, c, e) + self.get_noise(roughness)
if self[(end_col, midpoint_y)] == 0:
self[(end_col, midpoint_y)] = self.average(b, d, e) + self.get_noise(roughness)
def iterate(self):
'''Generate new heights.
For different size squares, calculate new middle heights and new edge middle heights.'''
square_size = self.width-1
roughness = ROUGHNESS
while square_size > 1:
# Reduce roughness as square size decreases
roughness *= math.pow(2, -ROUGHNESS)
for start_row in range(0, self.height-square_size+1, square_size):
for start_col in range(0, self.width-square_size+1, square_size):
self.set_new_heights(start_row, start_col, square_size, roughness)
square_size /= 2
def diamond_square(self):
'''Start the diamond-square algorithm.'''
# Set four corners with initial values
self[0,0] = self.get_random_height()
self[0,-1] = self.get_random_height()
self[-1,0] = self.get_random_height()
self[-1,-1] = self.get_random_height()
self.iterate()
#self.erode.smooth_edges(self, [True,True,True,True])
def diamond_square_tile(self, neighbors):
'''Create a new HeightMap that lines up with this Heightmap on a particular side.
This is used for tiling the Heightmaps in a relatively seamless way.'''
corners = [(0,0), (-1,0), (-1,-1), (0,-1)]#counter-clockwise from top-left
edges = [True,True,True,True]
if len(neighbors) == 0:
self.diamond_square()
else:
#if has neighbor to left
if (self.x-1, self.y) in neighbors:
# Left side of new Heightmap is seeded
#print "has left"
for y in range(self.height):
#print neighbors[(self.x-1, self.y)][-1, y]
self[0, y] = neighbors[(self.x-1, self.y)][-1, y]
if (0,0) in corners:
corners.remove((0,0))
if (0,-1) in corners:
corners.remove((0,-1))
edges[3] == False
#if has neighbor to right
if (self.x+1, self.y) in neighbors:
# Right side of new Heightmap is seeded
for y in range(self.height):
self[-1, y] = neighbors[(self.x+1, self.y)][0, y]
if (-1,0) in corners:
corners.remove((-1,0))
if (-1,-1) in corners:
corners.remove((-1,-1))
edges[1] = False
#if has neighbor down
if (self.x, self.y+1) in neighbors:
# Bottom of new Heightmap is seeded
for x in range(self.width):
self[x, -1] = neighbors[(self.x, self.y+1)][x, 0]
if (0,-1) in corners:
corners.remove((0,-1))
if (-1,-1) in corners:
corners.remove((-1,-1))
edges[2] = False
#if has neighbor up
if (self.x, self.y-1) in neighbors:
# Top of new Heightmap is seeded
for x in range(self.width):
self[x, 0] = neighbors[(self.x, self.y-1)][x, -1]
if (0,0) in corners:
corners.remove((0,0))
if (-1,0) in corners:
corners.remove((-1,0))
edges[0] = False
for corner in corners:
self[corner[0], corner[1]] = self.get_random_height()
self.iterate()
#self.erode.smooth_edges(self, edges)
self.erode.run(1, self, edges)
def save(self, filename):
'''Save the HeightMap into an image file (.bmp)'''
im = Image.new("L", (self.width, self.height))
pixels = im.load()
for y in range(self.height):
for x in range(self.width):
im.putpixel((x,y),self[(x, y)])#im.putpixel((x, y), self[(x,y)])
im.save(filename)
