Saucers, Bullets, Shields, and Health Bars
In this example, we will look at four new actors: saucers, bullets, shields, and health bars. The code for this section is found under the group Example 2, in the Xcode project Sample 06+07.
The health bar and bullet actors will be rendered programmatically with Core Graphics instead of using a pre-rendered image. The other actors—saucers and shields—exist in this example to provide a little context (got to have something to shoot with the bullets) and flesh out our example from the last chapter in terms of behaviors. Figure 7–1 shows the saucers, bullets, shields, and health bars in action.
Figure ...
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