Click in the textfield, type in a Processing method, like line(10, 10, 50, 50), and you should see the result drawn in the applet. Each new command will clear the canvas, but you can use the up and down arrows to cycle through commands you have previously typed. Some methods, like smooth() toggle a state that is retained from one frame to the next, so typing new commands will not reset the state.

Source code: live_code Parser

Built with Processing