spechal.com » Python

Resizing and recoloring images with Python

Spechal — Sun, 20 Mar 2011 07:09:51 +0000

import Image # I have the power!
 
theFile = "foo.png" # the file to start with
 
img = Image.open(theFile) # open the image
resized = img.resize((75,75)) # resize the image
r, g, b, alpha = resized.split() # get the RGBA data
 
newImage = Image.new(resized.mode, resized.size, "black") # make a new image
newImage.paste(resized, mask=alpha) # copy the old to the new
newImage.save("out.png") # save it
 
print "Done" # Yay!

Python MySQL Associative Array

Spechal — Fri, 27 Nov 2009 23:26:04 +0000

By default, the MySQLdb module to access a MySQL database returns the data as an integer indexed array. Sometimes this is not desirable and an associative array is preferred, such as the mysql_fetch_assoc function in PHP. In addition, we will be using the pprint module which is similar PHP’s print_r

Here is the Python equivalent:

import MySQLdb
import pprint
# connect to the database here
db = MySQLdb.connect(...)
c = db.cursor(cursorclass=MySQLdb.cursors.DictCursor)
query = "SELECT `name`, `address` FROM `table`"
c.execute(query)
rows = c.fetchall()
c.close()
pprint.pprint(rows) # i.e. print_r($rows)

Hope that helps someone.

Python emulate mouse click in Windows

Spechal — Fri, 20 Nov 2009 14:38:18 +0000

The following bit of code, which requires the win32api, simulates a mouse click using Python under the Windows OS. import win32api, win32con def click(x,y): win32api.SetCursorPos((x,y)) win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN, x, y, 0, 0) win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP, x, y, 0, 0) click(100, 100) # simulate mouse … Continue reading →

Python Print Screen and Save Image in Windows

Spechal — Fri, 20 Nov 2009 00:07:14 +0000

So you need to do a “Print Screen” and save the image in the clipboard huh? I had that exact need too. Let me save you a few hours of trouble and tell you that the win32clipboard does not yet have the ability to return the contents of the clipboard when the contents are BITMAP, despite the CF_BITMAP constant.

How do you do it then? I was wondering the same thing. Behold, PIL. PIL, the Python Image Library, saved me from a massive headache.

Here is the code to take a screen shot and save it. You will need the win32api and PIL libraries.

import win32api, win32con, ImageGrab
win32api.keybd_event(win32con.VK_SNAPSHOT, 1)
im = ImageGrab.grabclipboard()
im.save("screenshot.jpg", "JPEG")

Now wasn’t that easy!

Python Abstract Snow Art using PyGame

Spechal — Tue, 17 Nov 2009 02:27:12 +0000

#
#   Abstract Random Snow Art
#   Copyright 2009 Travis Crowder
#   travis.crowder@spechal.com
#   Published under the MIT License
#
import pygame, sys, random
from pygame.color import THECOLORS

pygame.init()

screen = pygame.display.set_mode([640,480])
screen.fill([0,0,0])

for i in range(1, 2500):
    top = random.randint(2, 478)
    left = random.randint(2, 638)
    color_name = random.choice(THECOLORS.keys())
    color = THECOLORS[color_name]
    pygame.draw.rect(screen, color, [left, top, 1, 1], 1)
pygame.display.flip()
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()

Python Abstract Box Art using PyGame

Spechal — Tue, 17 Nov 2009 02:21:35 +0000

#
#   Abstract Random Box Art
#   Copyright 2009 Travis Crowder
#   travis.crowder@spechal.com
#   Published under the MIT License
#
import pygame, sys, random
from pygame.color import THECOLORS

pygame.init()

screen = pygame.display.set_mode([640,480])
screen.fill([0,0,0])

for i in range(1, 100):
    width = random.randint(0, 250)
    height = random.randint(0, 250)
    top = random.randint(5, 435)
    left = random.randint(5, 375)
    color_name = random.choice(THECOLORS.keys())
    color = THECOLORS[color_name]
    line_width = random.randint(1,3)
    pygame.draw.rect(screen, color, [left, top, width, height], line_width)
pygame.display.flip()
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()