To install the library, run pip install madison_wcb at the command line. Now you’re ready to paint some pictures!

How to draw stuff on your computer screen

Here’s a short Python program that draws a box in the middle of your computer screen (and on your WaterColorBot, if it’s plugged into your computer):

# Import all the functions in the `madison_wcb.wcb` module.
from madison_wcb.wcb import *

# IMPORTANT: You MUST call initialize() at the
# start of your program. It won't work otherwise.

# Dip the brush in whatever color's currently located
# in the fourth spot from the top in your bot's
# watercolor palette.

# Get ready to draw a box: move to the top-left
# corner of the box we're going to draw.
move_to(-50, 50)

# Point in the direction of 0 degrees, which is
# straight to the right.

# Put the brush down.
# If we didn't include this line, nothing would get drawn!

# Do this next bit four times:
for i in range(4):

    # Move forward a hundred steps, then
    # turn ninety degrees to the right.

# We've finished drawing our box! Wash the brush.
# It's a good idea to always call cleanup() at the end
# of your program so the brush doesn't get gross.

# Wait for the user to press Enter before exiting the program.
# Without this line, the program would draw a box
# on the screen really fast, then close the turtle window
# _immediately_ before the user had a chance
# to look at the picture their code drew!
input("Done! Press Enter to close the program.")

The important things to remember are that you must call initialize() at the beginning of your program, and that you should also call cleanup() at the end of your program. Aside from that, go nuts!

Note: When you run your program, you’ll see a small window on your screen that simulates what’ll happen when you have the watercolorbot paint your picture. Make sure that your picture stays within the bounds of that small window; anything that you draw outside of that window will not get painted when you run your program on the actual bot.

To see a list of all of the different functions you can use to control the bot, click on this link: madison_wcb. You can also read the library’s source code, it really isn’t very long.

How to actually paint pictures on the WaterColorBot

madison_wcb uses a program called CNC Server to control the WaterColorBot. In order to have your Python program paint pictures on the bot, go to the CNC Server README and follow the instructions in the Installation and Running sections.

Once you’ve done that, you’re good to go - when you run a program that uses madison_wcb, it should automatically draw stuff on the robot as well as on your screen.

More Example Programs

madison_wcb comes with a few example programs that you can use as starting points. Read through them, try to predict what they’ll do or just copy-paste them into your editor and run them yourself! Once you’ve got one of them running, try making a change to it and see what happens, and then make more changes, and just generally keep going and have a great time. Play around!