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You can still turn 180° sometimes #3

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graue opened this issue Oct 19, 2013 · 1 comment
Closed

You can still turn 180° sometimes #3

graue opened this issue Oct 19, 2013 · 1 comment

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@graue
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graue commented Oct 19, 2013

Killing yourself by turning 180° is supposed to be prevented, but you can still do it. Assume you're going left. Quickly press down or up followed by right. If game logic hasn't run in between the two key-presses, you don't move vertically and so run into your tail right away.

To fix this, we should save the direction that was last advanced in (by a pixel or more after flooring), and disallow turning in the opposite of that direction.
graue added a commit that referenced this issue Nov 6, 2013
@graue
Partial fix for 180° turns (issue #3)
b6ff992 
The other part is to advance the snake only by entire pixels at a time.
You can still trigger the bug if you are going right, press up/down,
"advance" 0.3333 pixels then press left, and the floor of your new
location equals the floor of the old. This is because using a position
variable with more precision than our collision-detecting routine is
silly :)
@graue
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graue commented Nov 6, 2013

Partially fixed in b6ff992.

@graue graue closed this as completed in 3efdc57 Nov 20, 2013
@graue graue mentioned this issue Nov 20, 2013
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