Some of the top grossing games on the iPhone and iPad have been line/path drawing games with Flight Control and Harbor Master being among the most famous.
Here’s a tutorial by Jean-Pierre Distler that goes through process of creating a basic line drawing game using Sprite Kit.
The tutorial covers setting up the game background, the basic algorithm for drawing lines, getting the character to follow the drawn path and angle correctly, detect collisions and more.
Here’s an image from the tutorial showing the character following a drawn path:
You can find the tutorial over on the Ray Wenderlich blog.
A nice guide to creating a line drawing game.
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