This happened to me last week. Yet another lesson learned. I was working on debugging some code at work. Someone was complaining about some functionality in an element we draw on screen. In order to better diagnose the problem, I wanted to create an example and see if I couldn’t get the problem to reproduce. Not a bad first step.

The problem was that as I wrote out the code I made a typo on the code I was writing. I wrote something like the following snippet:

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     // ... 
     int x = pixels2OtherUnitsX(20);
     int y = pixels2OtherUnitsX(23);

     // ...

If you look closely you will see that I’m using pixels2OtherUnitsX() in both cases, where I should probably be using pixesl2OtherUnitsY() in the second case. Oops.

What do you know, my image didn’t render correctly on screen. I had recreated the bug that someone said was out there. Now all I had to do was figure out where in our production code the bug was. I spent way too long looking around for the problem.

Lesson don’t be so blinded by your desire to find a bug you miss one that is right in front of your face.