Move the mouse-pointer around while holding the space bar to draw. To not draw, just don't press the space bar. Click the color buttons to change the color of your line. Click clear to clear what you have drawn. Use the left and right arrow keys to change the width of the line you draw. Use the up and down array keys to change the shade of the color you draw.
@Yellow_Dolphin! HUGE HUGE THANKS TO YELLOW_DOLPHIN A D D E D : MOUSE CONTROLS A SHADE/SIZE CALC A ☁ DOTS VAR (TOP RIGHT CORNER) MAX SIZE OF 500 MAX SIZE OF 1000 SHADE FASTMODE! YOU CAN CHANGE COLORS WAY EASIER!