Category Archives: Programming

programming

Create first android project using adt-bundle-linux-x86

If you make android applications then in this tutorial you’ll learn how to create an Android project. The easy way is to use adt bundle linux. To use the ADT bundle Linux you need to install JRE and JDK.

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jre-7u9-linux-i586

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jdk-7u9-linux-i586

You can get from oracle website. The ADT Bundle includes everything you need to… Read More »

Simple way to create png image with an input text.

First, you need to have the PIL python module and import this.

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from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
from PIL import ImageFilter

Next will be this function. Basically will make and return one RGBA image data type.

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def make_img(image, textColor, backgroundColor):
  img = image.convert("RGBA")
  img.putdata([textColor if value == 0 else backgroundColor
                   for value in image.getdata()])
  return img

The next step is to set the text, font, and the new image. I use Arggotsc.ttf. You can use any TrueType font.

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text = " Another script with python language! "
font = ImageFont.truetype('Arggotsc.ttf', 55)
image = Image.new("1", font.getsize(text), '#FFF')

Now we can… Read More »

Using pip for installing and managing Python packages.

An easy_install replacement is pip. The pip installs packages and managing Python packages. Let’s try to install packages.

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$ pip install PyOpenGL_accelerate
bash: pip: command not found

Install the pip package. The recommended way to use the pip tool is within virtualenv since every virtualenv has pip installed in it automatically.

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[free-tutorials@free-tutorials ~]$ curl -O https://raw.github.com/pypa/virtualenv/master/virtualenv.py
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  111k  100  111k    0     0  75459      0  0:00:01  0:00:01 --:--:--  139k
[free-tutorials@free-tutorials ~]$ python virtualenv.py my_new_env
New python executable in my_new_env/bin/python
Installing setuptools............................done.
Installing pip.....................done.
[free-tutorials@free-tutorials ~]$ . my_new_env/bin/activate
(my_new_env)[free-tutorials@free-tutorials ~]$ pip --help
Usage: pip COMMAND [OPTIONS]
--version                    show program's version number and exit
-h, --help                   Show help
-v, --verbose                Give more output
-q, --quiet                  Give less output
--log              Log file where a complete (maximum verbosity) record will be kept
--proxy               Specify a proxy in the form user:passwd@proxy.server:port. Note that the user:password@ is
optional
  and required only if you are behind an
                              authenticated proxy. If you provide user@proxy.server:port then you will be prompted
for a password.
--timeout           Set the socket timeout (default 15 seconds)
--exists-action <EXISTS_ACTION>
                              Default action when a path already exists. Use this option more than one time to
specify another
action if a certain option is not available.
                              Choices: (s)witch, (i)gnore, (w)ipe, (b)ackup
 
Commands available:
  bundle: Create pybundles (archives containing multiple packages)
  freeze: Output all currently installed packages (exact versions) to stdout
  help: Show available commands
  install: Install packages
  search: Search PyPI
  uninstall: Uninstall packages
  unzip: Unzip individual packages
  zip: Zip individual packages

Let’s try again with PyOpenGL and PyOpenGL_accelerate packages.

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(my_new_env)[free-tutorials@free-tutorials ~]$ pip install PyOpenGL PyOpenGL_accelerate
Downloading/unpacking PyOpenGL
  Downloading PyOpenGL-3.0.2.tar.gz (891kB): 891kB downloaded
  Running setup.py egg_info for package PyOpenGL
    /usr/local/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'use_2to3'
      warnings.warn(msg)
      ....
      

Now we… Read More »

Embedding python in C under Fedora 16.

About the source code. I will try to embed python in C application. I will use a simple python script. This is a simple example using pygame python module.

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import pygame
screen = pygame.display.set_mode((640,400),0,32)
BKColor = (255,255,255)
screen.fill(BKColor)
pygame.display.update()
pygame.time.delay(1000)

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$ python
Python 2.7.2 (default, Oct 27 2011, 01:36:46)
[GCC 4.6.1 20111003 (Red Hat 4.6.1-10)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pygame
>>> screen = pygame.display.set_mode((640,400),0,32)
>>> BKColor = (255,255,255)
>>> screen.fill(BKColor)
<rect(0, 0, 640, 400)>
>>> pygame.display.update()
>>> pygame.time.delay(1000)
1003
>>>
 

Make a new folder and named Python_C using these commands in the shell:

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$ mkdir Python_C
$ cd Python_C/
Python_C]$ ls

Let’s see the C source code.

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#include    
int  main() {
    printf("embed-simple-example\n");
    Py_Initialize();
    PyRun_SimpleString("import pygame");              
    PyRun_SimpleString("screen = pygame.display.set_mode((640,400),0,32)");
    PyRun_SimpleString("BKColor = (255,255,255)");
    PyRun_SimpleString("screen.fill(BKColor)");
    PyRun_SimpleString("pygame.display.update()");
    PyRun_SimpleString("pygame.time.delay(1000)");
    return 0;
}
 

You can read… Read More »

Simple WebGL example.

WebGL is a software library and cross-platform API that extends the capability of the JavaScript programming language. That brings OpenGL to the web as a 3D drawing context within HTML Today we present a simple example of using WebGL. Here, there is an HTML content, javascript, and content of WebGL content. The three main sections… Read More »

XSS sanitization on django – variables and templates

XSS attacks allow a user to inject client-side scripts into the browsers of other users. Using Django templates protects you against the majority of XSS attacks. To do this you need to protect your templates this code:

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{% autoescape off%}
{{your_form}}
{%end autoescape%}

If you need to disable auto-escaping for an individual variable, then use the safe filter:

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{{ your_variable|safe }}

Read… Read More »

How to create an executable in Linux using OpenGL.

I will try to show you briefly how to create Linux OpenGL applications. We check if the graphics card and settings are done correctly, using the command:

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$ glxinfo
name of display: :0.0
display: :0  screen: 0
direct rendering: Yes
server glx vendor string: NVIDIA Corporation
server glx version string: 1.4
server glx extensions:
    GLX_EXT_visual_info, GLX_EXT_visual_rating, GLX_SGIX_fbconfig,
    GLX_SGIX_pbuffer, GLX_SGI_video_sync, GLX_SGI_swap_control,
    GLX_EXT_texture_from_pixmap, GLX_ARB_multisample, GLX_NV_float_buffer
...

As freeglut devel package provides libraries for OpenGL. Let’s install that package.

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# yum -y install freeglut-devel

Then we see if we have the necessary files.

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$ cd /usr/include/GL
... GL]$ ls
freeglut_ext.h  gl.h          glut.h       GLwMDrawAP.h  glx_mangle.h  internal
freeglut.h      gl_mangle.h   GLwDrawA.h   glxext.h      glxmd.h
freeglut_std.h  glu.h         GLwDrawAP.h  glx.h         glxproto.h
glext.h         glu_mangle.h  GLwMDrawA.h  glxint.h      glxtokens.h
 

Let’s try a simple… Read More »

Using pstats python module .

Today I will show how to use the pstats python module. It’s just some simple example, but can be useful for us.

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$ nano test.py

Let’s add some source code to test this python module.

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import os, sys
import math
for i in range(100000):
        i=i+i
        print(i)

The documentation tells us: A profiler is a program that describes the run time performance of a program, providing a variety… Read More »