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This site is dedicated to the students and teachers who want to learn Scratch. . To download all the video-tutorials and materials in this website, please submit your name and the mailing address of your school or institution through the 'Contact Us' link. You will receive a username and password that will allow you to login and download these materials. You will also find instructions on how to use these resources.

This is an example of building a tree layout using the Reingold-Tilford "tidy" algorithm, as described in "Tidier Drawings of Trees". As each new element is added to the graph, it animates in, starting at the previous position of the parent node. Thus, the existing nodes and the new node transition smoothly to their new positions. The animation stops when 500 nodes have been added to the tree.