Hands-on Rust: Missing code change to render the map with camera (page 113 in P1.0)

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When introducing the camera, compilation errs as the change to the map’s render method is not reflected in src/main.rs, if just following the flow of the text.

Perhaps the next can just add the change on p113, from:

self.map.render(ctx);

To:

self.map.render(ctx, &self.camera);

In the state’s impl of the GameState trait.

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