Just start drawing with the cursor (the mouse or touchscreen or whatever input you use) and see what happens. Hit space bar to clear screen and start over without stopping music... Up arrow changes to black background Right arrow changes to other color backgrounds Down arrow changes pen color. Left arrow - all white pens - make snowflakes with this.... After using the white pen - down arrow makes just 2 colors which is quite interesting... 'a' and 's' keys change pen size. a - thicker s - thinner Click green flag to reset default colors and pen size. Type 'g' for an x-y grid to show the math... (When using the x-y grid, click and drag the scratch cat to see the changing x,y coordinates of the master pen. The other pens are drawing reflections of the master pen position across the x and y axis. See inside the program to see how the x and y coordinates are changed for the other pens which are represented by the hidden scratch cat sprites. Click the green flag again if the pens stop working.)
This demonstrates rotation about the origin of a Cartesian coordinate plane... The music is some electric guitar riffs I created with a Boss RC-20 looping station and Audacity. Type 'm' for credits... Type 0 key to stop music and keep drawing....
