Chapter 8: UI, Health, XP, and Level Up

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Technical requirements

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Drawing the UI in screen space

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The reusable progress bar

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The floating message

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Composing the HUD

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Giving the player health, XP, and level

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Adding pickup collision layers

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Spawning and collecting XP orbs

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Wiring it together in game.go

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Running the chapter

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Summary

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Chapter 7: Weapons and Projectiles

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Chapter 9: Health Potion, Sacred Book, and Holy Shield