Rendering

Rendering commands draw to the window opened by the osl/window package. They run inside the mainloop: block, which executes once per frame, so whatever you draw is redrawn every frame.

A program positions a draw cursor, sets a colour, then issues element commands (square, icon, text, image) relative to that cursor.

• Basics - colours and the frame model.

• Draw Cursor - moving the point that elements draw from.

• Elements - the shapes and content you can draw.