divergenza/divergenza.py

#!/usr/bin/python

'''
Schotter pdf reproduction

It design SchotterR 
Author: Jan Bodnar
Website: zetcode.com 
Last edited: April 2016
'''

import math,cairo,random

def plotSquares(ctx):
    global rsum
    for i in xrange(0,w-1):
	
	rsum += i*rs # add to the random value
	ctx.save()
        ctx.translate(s*i, 0)
	for j in xrange(0,h-1):
		
		rv = random.uniform(-rsum, rsum)
		# here comes the box :-)
		#box = shapes.square(s)
		
		# box position
		#curr_cx = - w*s/2 + i*s + rv*dp ;	curr_cy = - h*s/2 + j*s + rv*dp
		#   transforms.center_at(box, [curr_cx, curr_cy])
		#
		#  # rotate the box of rv degrees around its center
		#  transforms.rotate(box, rv, pivot=(curr_cx, curr_cy))
                #
		# draw the damn box	
		#  plotter.write(box)
                #
                ctx.translate(rs*dp*i, s)
                #ctx.rotate(math.pi * 1 / 4)
                ctx.save()
                ctx.rotate(rv)
                ctx.rectangle(0,0, s, s)
                ctx.restore()
                ctx.stroke()
        ctx.restore()


#float RGB touple
FG_RGB_COLOR=(0,0,0)
#A4 in 300 DPI
width, height = 3508,2480
offsetX, offsetY = 100,500

w = 10 # width (how many squares - es. 22)
h = 12 # height (how many squares - es. 12)
s = 100 # square size  (es. 15)

rs = 0.015 # random step (rotation increment in degrees)
dp = 2.25 # dampen (soften random effect for position)
rsum = 0 # dummy initial value for rsum




surface = cairo.PDFSurface ("/tmp/circle.pdf",width,height)
ctx = cairo.Context (surface)

ctx.set_source_rgb(FG_RGB_COLOR[0],FG_RGB_COLOR[1],FG_RGB_COLOR[2])
ctx.set_line_width(1)
ctx.translate(offsetX, offsetY)
plotSquares(ctx)




ctx.show_page()