Clicking on Tia makes her move and sing, and the script to do this can just live in her sprite with a "when clicked" cap. Clicking on a button, however, can't make another sprite move or change costumes without sending a message. The buttons in this project accomplish this task by broadcasting messages. We format messages like this: object.verb() It's just a convention in Scratch, but it is syntax in other languages that you might as well get used to. Duplicate a button. Edit the scripts so that the new button does something interesting with one of the instruments.
Project Lead The Way is a non-profit organization offering curriculum and professional development to U.S. schools. CSE is our new computer science course for high schools. CSE students create projects in many languages, including Scratch, MIT App Inventor, and Python. See http://www.pltw.org/our-programs/computer-science for details. Photo: Tia Bastien
