Mandelbrot - some simple changes

Played around with the Mandelbrot example last night.
Here’s a faster version with some minor changes:

What’s changed:

  • local variables are much faster in Lua than global - so it pays to declare your inner loop vars as local; this led to a 15% improvement of the initial zoom, and higher when you zoom in (and the iterations of the inner loop go up)

  • instead of updating a single row from the image and drawing all of it, switch the backingMode to RETAINED, use a image consisting of a single row and draw only this image at the appropriate position on the screen. This led to a 2x improvement of the initial zoom.

@ivanassen nice improvements! Can’t wait to try them out

Love it!