Software Engineering and Computer Games

6.3. The animation cascade

This section discusses how the CPopApp:animateAllDocs(dt) cascades its calls down to the simulation objects of each open document.

Sequence diagram of the animation

In this subsection we’ll give a description of the animation process and then we’ll draw a UML sequence diagram of it.

First let’s write out in words a description of how the animation process works.

• The CPopApp::OnIdle function makes a call to the CPopApp:animateAllDocs(dt).

• The cPerformanceTimer tick() method returns the time dt elapsed since the prior update.

• CPopApp:animateAllDocs(dt) steps through the list of open CPopDoc documents and for each of these documents calls a CPopDoc::stepDoc(dt) function.

• Firstly, CPopDoc::stepDoc(dt) calls the cGame::step(dt) ...