User:Eleanorg/1.2/Forbidden Pixels/composing image with ImageMagick: Difference between revisions
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#-*- coding:utf-8 -*- | #-*- coding:utf-8 -*- | ||
import | import re, urllib2 | ||
Revision as of 22:01, 28 March 2012
As per Michael's advice, I've dispensed with making system commands from within the python script. Eventually, figure out how to use the PyhtonMagick interface - but for now, this script is just printing out bash commands which use Imagemagick. Run the script with Python, then pipe to bash to execute.
Drawing pixels onto a grey image
#!/usr/bin/python
#-*- coding:utf-8 -*-
import random
# this is bash syntax which is just printed out; run with python and pipe into bash
print "convert -size 640x480 xc:grey -fill 'rgb(255,0,0)' \\" # creates a new image of size 640x480, bg colour grey, fg colour red. \\ prints out the bash newline character
for i in range(100): # creates 100 randomly spaced red pixels over the grey background
y = random.randint(0,480)
x = random.randint(0,640)
print "-draw 'point %d,%d' \\" %(x,y) # %d means a digit from the range given in the parentheses at the end - which points to variables x and y
print "drawn.png"
Drawing pixels based on scraped data
This script goes to a specified url, finds the magic string, scrapes it and draws the appropriate pixel onto a new .png image. fuck yeh! next: figure out how to add pixels onto the same file; this script currently overwrites any preexisting file with the same name.
Run with python and pipe to bash to execute. Next step: how to run imagemagick commands via a cgi script?
#!/usr/bin/python
#-*- coding:utf-8 -*-
import re, urllib2
# scrapes pixel data and pushes it to imagemagick
#------------- get URL -------------------#
url = "http://ox4.org/~nor/trials/hostedString.html"
#------------- scrape webpage----------------------------#
text = urllib2.urlopen(url).read() # reads page at the specified URL
#------------- draw on a pixel -------------------------#
pat = r"Pixel position:(\d\d\d).(\d\d\d)\;\ Color:(rgba\(.*\))"
if not re.search(pat, text): # if pattern 'pat' isn't matched within 'text'
print "nothing found"
else:
for m in re.finditer(pat, text): # for each match in text
string = m.group(0) # m.group() lets you access data within the match object
xPos = int(m.group(1)) # note: m.group(1) is first capture () - m.group(0) is always whole string
yPos = int(m.group(2))
color = m.group(3)
print "convert -size 640x480 xc:black -fill ' " + color + " ' \\"
print "-draw 'point %d,%d' \\" %(xPos,yPos)
print "drawn2.png"