from __future__ import print_function
import math
import fitz
"""
@created: 2017-06-18 10:00:00
@author: (c) Jorj X. McKie
Demo for creating simple graphics with method 'Page.drawLine()'.
Dependencies:
PyMuPDF, math
License:
GNU GPL 3+
Sketching a caustic. This is the figure the early morning sun paints onto
your desperately needed cup of coffee from an angle on your left side ...
"""
def pvon(a): # starting point of one sun ray
return(math.cos(a), math.sin(a))
def pbis(a): # end point of one sun ray
return(math.cos(3*a - math.pi), (math.sin(3*a - math.pi)))
# create new PDF with an empty square format page
doc = fitz.open()
doc.insertPage(-1, width = 800, height = 800)
page = doc[0] # get the page just created
# if you want a coffee background, use some picture reflecting your
# preferred amount of milk.
page.insertImage(page.rect, "coffee.jpg")
# middle of the circle of the page
mitte = fitz.Point(page.rect.width / 2, page.rect.height / 2)
# radius leaves a border of 20 pixels
radius = page.rect.width / 2 - 20
# how many sun rays we paint
count = 200
interval = math.pi / count
color = (1, 1, 0) # this is plain yellow
for i in range(1, count):
a = -math.pi / 2 + i * interval
von = fitz.Point(pvon(a))*radius + mitte # start point adjusted
bis = fitz.Point(pbis(a))*radius + mitte # end point adjusted
page.drawLine(von, bis, width = 0.5, color = color)
doc.save("caustic.pdf", garbage = 4, deflate = True)
