Game的基本元素.[小糊涂的灵感]

• GameManager Handles keyboard input, updates sprites, provides collision detection, and plays sound and music.

• TileMapRenderer Draws the tile map, parallax background, and sprites.

• ResourceManager Loads images, creates animations and sprites, and loads levels.

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• On Windows machines, the granularity of the system timer isn't accurate enough for smooth scrolling.  "Optimization Techniques."

• Using sprite bounds for collision detection isn't accurate enough. Smaller collision bounds could be used instead.

• Also, you could use better collision handling for times when the sprite travels across large distances between frames.