CompSci 4Alice – Chap 1Jan 27, 2005Prof. Susan RodgerAnnouncements• Assignment 2 due tonight• Classwork from Jan 18 due tonight• Classwork not finished today – must be completed by Tues, Feb 1, by class time• Versions of Alice – new version available! 1/26/05 - Download againToday’s class• Lecture – Finish Chap 1• Classes and Objects in Alice• Finish Appendix A•ExercisesTypes of Animations• In Appendix A – viewed two kinds of animations– Movie• User “watches” animation• “machine-centric”– Interactive• User “participates” – clicks mouse, types a key• “user-centric”Events• Animations that are “interactive” depend on user’s actions– Mouse click– Keypress– Others (HeadMountedDevice, etc.)• Actions are “events”• Interactive programs are “event-driven”Interactivity in Alice• No interaction –Octopus Ride – movie• Animation with interaction –Ice Skater– What are the events?– What response does the skater make to each event?Objects• What is an object?– Can be identified as unique from other things• How is an object unique?– Has a name– Has properties• Width, height, color, location, age, ss#, id#– Has a purpose• Associated actions it can perform• Tasks it can carry outClass• Objects are categorized into classes• Each object is an “instance” of the class• All objects in a class – Have similar properties– Generally can perform the same tasksObjects in a Virtual World• In Alice, each 3D model is a class of objects– chicken, chicken2, chicken3– Has colors• red, white, blue, grey, black, …Object Parts• Objects may be composed of partsCenter• At the center of mass• Where it stands on the ground• Where it is heldToday’s Classwork• Create a folder to work in each class period– My Documents => compsci4 => jan2705• Finish Appendix A – Part 1 and Part 2– Get checked off• Exercises 1, 2, and 3 on page 18– Get checked off• Copy work over to Duke
View Full Document
Unlocking...