Chapter 6. Animation

In this chapter we'll talk about how to write a program which continually updates itself onscreen. There are four tasks in an animation program.

• Place an animation update call in the app where you loop back indefinitely often.

• Calculate an appropriate timestep dt for each update.

• Cascade update calls from the app down to the individual data elements of the documents, passing them the current dt .

• Update the views after the data is updated.

In this chapter, we'll have one section on each of these four tasks.