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cellular.py    215 lines (198 with data), 7.7 kB

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'procedural cellular texture generator'
import os, math, random
from pyirrlicht import *
#~ driverType = EDT_NULL
#~ driverType = EDT_SOFTWARE
#~ driverType = EDT_BURNINGSVIDEO
#~ driverType = EDT_DIRECT3D8
#~ driverType = EDT_DIRECT3D9
driverType = EDT_OPENGL
ID_BUTTON_REGENERATE = 1000
ID_BUTTON_SAVE = 1001
class Cellular:
def __init__(self, video_driver, width = 64, height = 64, alpha = 255):
self.video_driver = video_driver
self.width = width
self.height = height
self.alpha = alpha
# create Irrlicht image
self.blend = True
image_format = ECF_R8G8B8
if self.alpha < 255:
image_format = ECF_A8R8G8B8
self.blend = False
self.image = video_driver.createImage(image_format, dimension2du(self.width, self.height))
self.texture = None
self.scolor = SColor(self.alpha, 0, 0, 0)
self.generate()
def generate(self, cellSize = 4, density = 8.0, maxDist = 0.11, mFact = 1.0, lPower = 1.0, s = 0.0, rand_range_count = 10):
'original version based on PIL, author Alex V. Boreskoff <steps3d@narod.ru> from http://steps3d.narod.ru/tutorials/cellular-textures-tutorial.html'
# compute probabilities for verious
# numbers of points
k1 = 1.0 / float(cellSize)
k2 = 1.0 / float(cellSize)
pointProbs = []
for m in range(rand_range_count):
p = lPower * math.exp(-density) / mFact
s = s + p
mFact = mFact * (m + 1)
lPower = lPower * density
pointProbs.append(s)
def numPointsForCell():
r = random.random();
for i in range(rand_range_count):
if r < pointProbs[i]:
return i
return i
def distance(p1, p2): # L2 distance function
dx = abs(p1[0] - p2[0])
dy = abs(p1[1] - p2[1])
if dx > 0.5:
dx = 1 - dx
if dy > 0.5:
dy = 1 - dy
d = math.sqrt(dx * dx + dy * dy) / maxDist
if d > 1:
d = 1
return d
#~ points = []
# generate random points
cells = []
for i1 in range(cellSize):
cells.append([])
for i2 in range(cellSize):
cells[i1].append([])
x1 = i1 * k1
y1 = i2 * k2
numPoints = numPointsForCell()
for i3 in range(numPoints):
x = x1 + k1 * random.random()
y = y1 + k2 * random.random()
#~ points.append((x, y))
cells[i1][i2].append((x, y))
# create textures F1, F2, F3, F4
for x in range(self.width):
for y in range(self.height):
d = []
pt = (float(x) / float(self.width), float(y) / float(self.height))
# cell of this point
i1 = (x * cellSize) / self.width
j1 = (y * cellSize) / self.height
cellList = [(i1, j1)] # create candidate list of cells
for i in range(-1, 2): # add every neighbouring cell
for j in range(-1, 2):
i2 = i1 + i
j2 = j1 + j
if i2 < 0:
i2 = cellSize + i2
if i2 >= cellSize:
i2 = i2 - cellSize
if j2 < 0:
j2 = cellSize + j2
if j2 >= cellSize:
j2 = j2 - cellSize
cellList.append((i2, j2))
for (i,j) in cellList:
for p in cells[i][j]:
d.append(distance(p, pt))
d.sort()
# now take four closest distances and map to colors, excluding duplicates
fs = []
j = 0
for i in range(4):
if j >= len(d):
j = len(d) - 1
v = d[j]
j = j + 1
fs.append(v)
while j < len(d) and d[j] == v:
j = j + 1
self.scolor.r = int(255 * fs [0] + 0.5)
self.scolor.g = int(255 * fs [1] + 0.5)
self.scolor.b = int(255 * fs [2] + 0.5)
self.image.setPixel(x, y, self.scolor, self.blend)
def get_texture(self, name = 'cellular_texture'):
if not self.texture:
self.texture = self.video_driver.addTexture(name, self.image)
return self.texture
def get_new_texture(self, cellSize = 4, density = 8.0, maxDist = 0.11, mFact = 1.0, lPower = 1.0, s = 0.0, rand_range_count = 10, name = 'cellular_texture'):
self.generate(cellSize, density, maxDist, mFact, lPower, s, rand_range_count)
if self.texture:
self.video_driver.removeTexture(self.texture)
self.texture = self.video_driver.addTexture(name, self.image)
return self.texture
def __del__(self):
self.image.drop()
if self.texture:
self.video_driver.removeTexture(self.texture)
class UserIEventReceiver(IEventReceiver):
app = None
name_counter = 0
def OnEvent(self, evt):
event = SEvent(evt)
if event.EventType is EET_GUI_EVENT:
gui_event_type = event.GUIEvent.EventType
if gui_event_type == EGET_BUTTON_CLICKED:
gui_id = event.GUIEvent.Caller.getID()
if gui_id == ID_BUTTON_REGENERATE:
if self.app.texture:
self.app.video_driver.removeTexture(self.app.texture)
self.app.texture = self.app.cell.get_new_texture()
else:
file_name = 'cellular_%02d.png' % name_counter
self.app.video_driver.writeImageToFile(self.app.cell.image, file_name)
self.app.gui_environment.addMessageBox('Warning', 'Cellular texture is saved to file %s' % file_name)
name_counter += 1
return False
class application:
def __init__(self, driver_type = driverType, width = 320, height = 240):
self.device = createDevice(driver_type, dimension2du(width, height))
if self.device:
self.device.setWindowCaption('Please wait one moment...')
self.video_driver = self.device.getVideoDriver()
self.scene_manager = self.device.getSceneManager()
self.gui_environment = self.device.getGUIEnvironment()
font_height = 20
gui_font = CGUITTFont(self.gui_environment, os.environ['SYSTEMROOT']+'/Fonts/arial.ttf', font_height)
if gui_font:
self.gui_environment.getSkin().setFont(gui_font)
gui_font.drop()
self.cell = Cellular(self.video_driver, 128, 128)
self.anim_cell = Cellular(self.video_driver, 16, 16)
self.device.setWindowCaption('Irrlicht Engine - Cellular texture generator')
self.gui_environment.addMessageBox('Warning', 'You is have\nrandom generated\ncellular texture.')
self.gui_environment.addButton(recti(0,0,100,font_height), IGUIElement(), ID_BUTTON_REGENERATE, 'regenerate', 'random generate cellular texture')
self.gui_environment.addButton(recti(110,0,200,font_height), IGUIElement(), ID_BUTTON_SAVE, 'save', 'save cellular texture')
event_receiver = UserIEventReceiver()
event_receiver.app = self
self.device.setEventReceiver(event_receiver)
else:
print('ERROR createDevice')
def run(self):
self.texture = self.cell.get_texture()
if self.texture:
texture_size = self.texture.getOriginalSize()
self.anim_texture = self.anim_cell.get_texture()
if self.anim_texture:
anim_texture_size = self.anim_texture.getOriginalSize()
scolor = SColor(255, 100, 100, 140)
while self.device.run():
if self.device.isWindowActive():
if self.video_driver.beginScene(True, True, scolor):
screen_size = self.video_driver.getScreenSize()
self.video_driver.draw2DImage(self.texture, position2di(int((screen_size.X-texture_size.X)/2),int((screen_size.Y-texture_size.Y)/2)), recti(0,0,int(texture_size.X),int(texture_size.Y)), 0, scolor, True)
if int(self.device.getTimer().getTime()/500) % 2:
self.anim_texture = self.anim_cell.get_new_texture()
self.video_driver.draw2DImage(self.anim_texture, position2di(250, 10), recti(0, 0, int(anim_texture_size.X), int(anim_texture_size.Y)), 0, scolor, True)
self.scene_manager.drawAll()
self.gui_environment.drawAll()
self.video_driver.endScene()
self.device.sleep(50)
else:
self.device.yield_self()
self.device.drop()
self.device.closeDevice()
if __name__ == "__main__":
app = application()
if app.device:
app.run()