Development notes (real readme to follow)
- A food pellet is placed at a random location (not the snake body or an existing food pellet) every certain number of loops
- The snake is updated
- Update the head
- A body segment is added in the direction of movement or in the direction of the keyboard command
- If the body can't move that direction (like backwards), just move forward as if no command was issued
- If the new segment occupies the same space as an existing segment, return false, indicating that the snake is dead. Maybe set a flag on the snake and check it in the main loop?
- Update the tail
- If we grew in the last loop (set a flag on the snake?), leave the tail where it is and increment the length. Or maybe it's increasing the stack size or something
- If we didn't grow, remove the tail body segment
- Update the head
- If the snake head occupies the same space as food
- set the grow flag on the snake
- remove that pellet from the play area
- Update the screen
- Get canvas
- Set all pixels to black
- Get list of food locations and write those pixels
- Get list of snake body locations and write those pixels
- Write canvas to screen
- Wait for the prescribed amount of time until the next loop while listening for arrow keys
- If an arrow key is captured during the wait, set the command to that direction.