Press space to show/hide the instructions. Press Z to show/hide the variables that you can adjust. You may have to hold down keys or buttons down extra long while a full render is running. Higher resolution renders may produce vertical line artifacts - these are not part of the fractal, they are an oddity with the Scratch player. To remedy this, use the checkbox at the bottom left of the start screen to disable atomic render, then shift click the green flag for Turbo mode. The render will be slower, but the artifacts will not show. Phosphorus/Sulfurous will give you a cleaner full render (no artifacts), but have poor responsiveness in preview mode. The Scratch player provides a far more usable experience, I think.
!!!!!!! This project has been 100% broken by the v461 player !!!!!!!! In December, I made a Mandelbrot fractal viewer for a friend who likes math. Last night, I recreated it in Scratch instead of sleeping. Fully black, interior pixels represent coordinates (x,y >> R,i) that are part of the Mandelbrot set. The colored pixels are actually not within the set. The brighter the colored pixel, the closer it is to being in the set (i.e. more iterations were needed to determine in/out). If you zoom in to the point where the fractal's edges look like rounded, finger-shaped blobs, then the accuracy of the math is degrading. You should increase the Iterations, which improves accuracy at the cost of render speed. If you keep zooming in, you'll eventually be limited by the precision of the floating-point math used in Scratch/Flash. If you're interesting in my AS3 original, you can find it at the following link. It's made in Flex for Flash, so the performance and quality is far superior to the Scratch version. http://www.tiberiumfusion.com/external/scratch/mandelbrot/