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+{"pages":[{"text":"Just to keep the blog rolling, I'm posting this ten-second clip of Guybrush Threepwood coming into existence from some sort of primordial soup of pixels. On the left, you can see the distortion field applied to the original image to deform it. It consists of a field of vectors, each of them centered on a pixel of the image, following a 2D Ornstein-Uhlenbeck process . They are convolved with a Gaussian kernel that grows as the video steps forward.","tags":"thingies","loc":"http://blog.debiatan.net/guybrush.html","title":"Distortion Vector Field"},{"text":"UTBP is a new subparadigm of Declarative Programming, in which code is generated from a description of its intended behavior, specified through unit tests. This work was presented at SIGBOVIK 2014 and received the Most Frighteningly Like Real Research Award. For an in-depth tour of UTBP, you can check the article and browse the associated GitHub repository . If you prefer a light introduction, you can choose between two versions of the same video. This one is dubbed: This one is subbed:","tags":"tools","loc":"http://blog.debiatan.net/utbp.html","title":"Unit-Test-Based Programming"},{"text":"This weekend I participated in the sixth edition of the Global Game Jam . The goal of the event was to create a game related in some way to a given theme in 48 hours. This year's theme was We don't see things as they are, we see them as we are . I decided to go for a multiplayer Gradius clone in which collisions with enemies remap your controls. I developed it using CodeSkulptor , which is basically a Python interpreter running on top of Javascript. Needless to say, it's no speed demon. See for yourself: If you want to give it a try, I have two suggestions to make: Find someone to play against (otherwise is going to look as sad as my single player game above). Run it on Chrome. Here's the profile of the game at the GGJ webpage and a link to the game . Enjoy! Update : Looks like my game placed third on the local vote we held after the Jam! Hooray!","tags":"games","loc":"http://blog.debiatan.net/gradius-meets-twister.html","title":"Gradius meets Twister"},{"text":"Every once in a while, I need to step outside the command line. Sometimes I'm even forced to interact with deaf graphical programs, those that do not listen to standard input or a meager HTTP port. In those desperate times, were it not for tools such as XAUT or xdotool , I would have to type and click outside of VIM , like cavemen probably did. Those two little programs are enough to make me happy when confronted with an X11 server. However, my computer, of a more whimsical nature, is reluctant to execute binaries other than a Python interpreter (like any other well-meaning general-purpose device assembled during the 21st century, really). That is why I have decided to write the simplest Python library I could think of that is able to: Find out the position of the mouse pointer Move the mouse pointer around the screen Press and release mouse buttons Press and release keys in the keyboard Capture the screen The xrobot library is lean, simple and Python[23]-compliant. It is just a wrapper around functions defined inside python-xlib . Since Xlib screen capture is painfully slow, the python-gtk bindings are used instead, if present. I have decided to return images as numpy arrays for my convenience; if you find that dependency unbearable, you can root it out easily from the code. Here's me, at five hundred clicks/second. I leave you with a link to the xrobot github repository and some sample code: import xrobot xr = xrobot . XRobot () xr . move ( 10 , 10 ) robot = XRobot () x , y = robot . mouse_pos () print ( 'Current mouse position: x =' , x , 'y =' , y ) robot . move ( 10 , 10 ) robot . click ( 1 ) robot . key ( 'a' ) # Press and release 'a' robot . key_down ( 'comma' ) # Press ',' robot . key_up ( 'comma' ) # Release ',' width , height = robot . screen_resolution () print ( 'Screen width:' , width , 'Screen height:' , height ) img = robot . capture_screen () import pylab as pl pl . imshow ( img ) pl . show ()","tags":"tools","loc":"http://blog.debiatan.net/xrobot.html","title":"xrobot"}]}