brainwagon

I lost the original edit to this post. Recreated.

So, while watching the Oscars, I decided to hack together a simple little graphics program that would allow me to generate more sophisticated graphics for the oscilloscope. I ended up with 263 lines of code that implemented a simple matrix-based set of graphics commands. Eventually, I’ll add some line clipping and some other graphics primitives, but for now, it seems to be working just fine.

YouTube – Animated Vector Graphics on an Oscilloscope

To give you a taste of what the library lets you do, here is the set of commands that I used to generate the animated dial you see in the film.

void
Dial(double seconds)
{
    int i ;
    TransformPush() ;
        fprintf(stderr, "... angle %lf\n", seconds*6.) ;
        Rotate(seconds*6.) ;
        Line(0.0, 1., -0.05, -0.05) ;
        Line(-0.05, -0.05, 0.05, -0.05) ;
        Line(0.05, -0.05, 0., 1.0) ;
    TransformPop() ;

    for (i=0; i<360; i+= 6) {
        TransformPush() ;
        Rotate((double) i) ;
        if ((i % 30) == 0)
            Line(1.0, 0., 0.90, 0.) ;
        else
            Line(1.0, 0., 0.95, 0.) ;
        TransformPop() ;
    }
}

Addendum: Congrats to Lee and all the Toy Story 3 crew, and to Randy for winning his second Oscar (with twenty nominations, incredible). He definitely has had the best speech of the night so far.

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