To paint an image rotated properly, first translate the canvas to the center of where the image will be painted. Then apply the rotation. Then either translate the inverse of what you just translated (just same values, negative), or paint the image a...
Just (finally) upgraded my ubuntu to 12.04 today. My machine had been flying in semi-upgraded state for a few weeks now (won't go into that) and it prevented me from updating specific stuff because the update list contained a zillion items, with no a...
There are various ways of getting a set of properties of an object. I'd like to list them and explain what set they actually gather. Getting the list of properties is handy when you use an object as a hash and want to iterate over all the elements of...
Simple way of getting the point of intersection between two lines (A-AA and B-BB) on a (2d) plane. Pass on the xy coordinates for all end points of the lines and you'll either get an object with x/y back or the falsy valu...
Say you have an origin and a bearing/heading (in radians). Say you want to determine the target position if you would move some distance into that direction. How would you do it? I can't explain this but I can tell you the simple way of doing it: ...
Searching for this problem is not easy. Even though the solution is very, very short. I wouldn't say simple, but I'm fine with that. So this problem is about having two angles (vectors) with the same origin. I needed to know whether one angle was ...
Simple script to get the bearings (the angle) of a line relative to a starting point. You can use this for your maps voodoo, or just like me, in a game. The script is utterly simple, as long as you understand the concepts of atan2 ;) ...
Out of the blue my computer started to be sluggish as hell. I'm still not sure why this suddenly became a problem, but it did. This post concerns a slow dns problem in Ubuntu 11.04, although I suspect you could apply this to other versions as well...
alt+f2 then lg and you'll get into a nice interactive JS shell where you can apply your js voodoo too gnome. I'm loving it :) (Works at least in Gnome 3.2, dunno about anything else but it seems to be older than that)...
Here's a very simple Ajax get. No attempt at edge casing, escaping, or cross browser fixes. Just xhr with a GET. js var get = function(url, callback){ var xhr = new XMLHttpRequest(); xhr.onreadystatechange = function () { if (...