OK, part 3 - now for something fun - extending parts 1 + 2 into a simple particle system.
Particles, generally means - a lot of things moving around (the particles) and a way to generate them, an "emitter"
Here we're going to take the code from the previous two parts and add a …
In my last post we made an arrow move around the screen, in this post we'll look to extend things so it's easy to make many things move around the screen.
This will make the code a little more complex, but as usual it makes things simpler later on.
Note …
Here's a little shoebot bot to experiment with natural movement.
This uses polar coordinates to decide the direction and velocity of an arrow on the screen.
Polar coordinates mean we can give an object a sense of 'forward', 'back', 'left' and 'right'
The code below works on the current version …
Uploaded some experiments with python and ctypes to here:
https://gitorious.org/pycairo-ctypes/pycairo-ctypes
This is a really rough proof of concept that the pycairo API can be implemented with ctypes + metclasses.
So far only ImageSurface is supported on the SVG backend, along with Contexts. The nice thing about this …
A quick post on using Python Charts to generate nice SVG charts for your django website (I've had the code hanging around for ages - so should just post it). The code is based on the examples there, here I integrate it into Django.
To install you'll need to do
pip …Seeing"Realtime FFT Graph of Audio WAV File or Microphone Input with Python..." on python.reddit.com reminded me of one I'd built in python with shoebot.
While it works OK, I feel like I'm missing a higher level audio library (especially having seen Minim, for C++ and Java).
When cairo 1.10 comes out we'll get a RecordingSurface so you can record commands and play them back to another surface, but how to do something similar now ?
Skip to the end if you just want the code, explanation of how I …
Often it's useful to be able to store up drawing commands so you can use them later somewhere else (or even just pass them to another thread).
This is a simple drawing model, implemented in cairo, hopefully somebody will find it useful.
Queue
``` {: .brush:python} class DrawQueue: ''' A list of …
Update: 26/April/2010
Problems I was having with incomplete images have been fixed in the current version of the web library, available in shoebots mecurial repository.
Using Processing from Jython is a promising idea, so I took the base from this post on backspaces.net where they explained how …
Cairo is a 2D vector graphics api used by Firefox, Gtk and other desktop projects.
I'm going to show here that it can also be used to generate web content, using Django.
I'm going to port two examples from the Michael Urmans Cairo Tutorial for PyGTK Programmers.
To understand the …
{: .alignnone …