# PREAMBLE
# My original intention was to create some
# disruptive visual camoflage, inspired by the pattern on
# the bark of plane trees. The result was never quite what I intended
# and several fixes had to be incorperated to aproximate what I wanted.
# The end result is effective though and reminds me of a Jackson Pollock
# or a Monet painting.
# CODE
from Tkinter import *
from math import *
from random import*
# critical parameters, adjust to suit
W = 900 # canvas dimensions
H = 500
nLow = 25 # recursive limiter
nLayers = 5 # number of repeated paint overs
nCover = 0.8 # Adjusts probability of a particular area being painted over per sweep
nMSpan = 5.0 # Same as above, These two parameters depend upon the number of recursions
nCSpan = 2.0 # Same for colour range
# scale factor per recursion. i.e. not scale invariant
aScale = [0.1, .3, .5, 0.5,0.9,0.9,0.1,0.1,0.1,0,0,0,0,0,0,0,0,0,0,0,0]
# colours are scale invariant
aColour = [0.5,0.5,0.5,0.5,0.5,0.5,0.5,0.5,0.5,0.5,0.5,0.5,0.5]
# The two functions AutumnPastels and DrawSplash
# can be modified to suit
def AutumnPastels(nCR, nCG, nCB):
# colour scheme
cR = ColStr(int((ZeroToOne(nCR, 8.0)) * 150) + 80) # red
cG = ColStr(int((ZeroToOne(nCG, 8.0)) * 150) + 80) # green
cB = ColStr(int((ZeroToOne(nCB, 8.0)) * 25) + 30) # blue
return '#' + cR + cG + cB
def DrawSplash(nX, nY, colour):
# simulation of paint splatter or leaves
nX2 = dist(nX, nLow / 2.0)
nY2 = dist(nY, nLow / 2.0)
for i in range(8):
nX1 = dist(nX2, nLow / 3.0)
nY1 = dist(nY2, nLow / 3.0)
nL = dist(nLow / 6.0 + 2, nLow / 3.0)
canvas.create_oval( nX1, nY1, nX1 + nL, nY1 + nL, fill = colour, width = 0)
canvas.update()
def ColStr( x):
if x > 255:
x = 0
if x < 0:
x = 255
s = "%x" % x # converts x into a hexidecimal string
if len( s) < 2:
s = '0' + s
return s
# This is a clumbsy way of recording continuity across the plane
# A dictionary would be more efficient, but it seems to work O.K.
def Load(aGrid, nX, nY, n):
# changes value if not set, or else it returns the value
if aGrid[nX][nY] == -1:
aGrid[nX][nY] = n
return n
return aGrid[nX][nY]
def ZeroToOne(nM, nSpan):
# maps the Real domain onto [0 , 1]
return atan(nM * nSpan) / pi + 0.5
def mid(n1, n2):
return int((n1 + n2) / 2)
def dist(nP, nScale):
return nP + (random() - 0.5) * nScale
def FracDown(aGrid, nX1, nY1, nX2, nY2, nTL, nTR, nBL, nBR, nLim, nRecursive, nCR, nCG, nCB):
# fractal lanscape grenerator
dx = nX2 - nX1
dy = nY2 - nY1
nS = aScale[nRecursive]
nT = dist((nTL + nTR) / 2, nS * nHorizFactor)
nL = dist((nTL + nBL) / 2, nS)
nR = dist((nTR + nBR) / 2, nS)
nB = dist((nBL + nBR) / 2, nS * nHorizFactor)
nM = dist((nTL + nTR + nBL + nBR) / 4, nS * nDiagFactor)
nSC = aColour[nRecursive]
nCR = dist(nCR, nSC)
nCG = dist(nCG, nSC)
nCB = dist(nCB, nSC)
nXm = mid(nX1, nX2)
nYm = mid(nY1, nY2)
if dx <= nLow and dy <= nLow:
if ZeroToOne(nM, nMSpan) > nLim:
DrawSplash(nXm, nYm, AutumnPastels(nCR, nCG, nCB))
return
nTL = Load(aGrid, nX1, nY2, nTL)
nTR = Load(aGrid, nX2, nY2, nTR)
nBL = Load(aGrid, nX1, nY1, nBL)
nBR = Load(aGrid, nX1, nY1, nBR)
t1 = (aGrid, nX1, nYm, nXm, nY2, nTL, nT, nL, nM, nLim, nRecursive + 1, nCR, nCG, nCB)
t2 = (aGrid, nXm, nYm, nX2, nY2, nT, nTR, nM, nR, nLim, nRecursive + 1, nCR, nCG, nCB)
t3 = (aGrid, nX1, nY1, nXm, nYm, nL, nM, nBL, nB, nLim, nRecursive + 1, nCR, nCG, nCB)
t4 = (aGrid, nXm, nY1, nX2, nYm, nM, nR, nB, nBR, nLim, nRecursive + 1, nCR, nCG, nCB)
aT = [t1,t2,t3,t4]
shuffle(aT)
for i in aT:
apply(FracDown, i)
def Frac(nLim):
aGrid = []
for i in range(W):
aGrid.append([-1] * H)
FracDown(aGrid, 0, 0, W - 1, H - 1, 0.0, 0.0, 0.0, 0.0,nLim, 1, 0.0, 0.0, 0.0)
seed()
canvas = Canvas( width = W, height = H)
canvas.pack(side = TOP)
canvas.create_rectangle( 0, 0, W, H, fill = AutumnPastels(-0.8, -0.4, -3.0), width = 0, tag ='o')
nHorizFactor = (W + 0.0) / (H + 0.0)
nDiagFactor = sqrt(H**2 + W**2) / (H + 0.0)
for i in range(nLayers):
Frac(nCover)
print 'done'
