W1512 Colorful Turtles

Within these castle walls be forged Mavens of Computer Science ...

— Merlin, The Coder

Hawaii Turtle

Prerequisites

• 1511 Walking Turtles

Background

Turtle graphics enable us to not only lift and drop the pen, but also to change the pen color and thickness. Using these tools and prior knowledge, we can generate a wide variety of colorful and complex patterns.

Experiment

Getting Started

Begin a new project

Create an Igis shell project within your "project" directory.

cd ~/projects
git clone https://github.com/TangoGolfDigital/IgisShell IgisShell-ColorfulTurtle

Enter into the Sources directory of the new project.

cd IgisShell-ColorfulTurtle/Sources/IgisShell/

Build the project. (This may take some time.)

swift build

Run the project.

swift run

Open a browser (or use a new tab on an already-open browser). Go to the URL: http://www.codermerlin.com/users/user-name/dyn/index.html

NOTE: You MUST change user-name to your actual user name. For example, http://www.codermerlin.com/users/john-williams/dyn/index.html

You'll know your successful if you see the title bar change to "Coder Merlin: IGIS". (The browser window will be blank because we haven't added any graphics yet.)

Helpful hint: It's useful to bookmark this page in your browser.