Tutorial - Building 2D Games - Fix circle collision math and a few typos. #138
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The circle collision explanation and code sample were incorrect. The Circle class is implemented correctly later in this chapter (see ./snippets/cirlce.cs#methods_intersects).
AristurtleDev
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Jun 9, 2025
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Thanks for catching the maths errors.
A few minor feedback points were added to the review if you could look over them.
articles/tutorials/building_2d_games/12_collision_detection/index.md
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articles/tutorials/building_2d_games/12_collision_detection/snippets/vector2_distance.cs
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…pos. (MonoGame#138) * Fix circle collision math and a few typos. The circle collision explanation and code sample were incorrect. The Circle class is implemented correctly later in this chapter (see ./snippets/cirlce.cs#methods_intersects). * Add back "Since this forms a right triangle," * Use * instead of _ * Switch circle radii back to 5 * Corrections --------- Co-authored-by: Simon (Darkside) Jackson <darkside@zenithmoon.com>
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The Building 2D Games tutorial is amazing! I really appreciate the hard work that went into it. I went through Chapter 12 and everything was great until the circle collision explanation. There's a couple of errors pertaining to the direction of inequality sign, so this MR attempts to straighten it out. It's notable that the
Circleclass is implemented correctly later in this chapter (see./snippets/cirlce.cs#methods_intersects).