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shape.arc: Prevent an angle underflow when rounded edges are enabled.

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Fixes #2604
This commit is contained in:
Emmanuel Lepage Vallee 2019-01-26 10:50:43 -05:00
parent e8bf75ef3c
commit 9efcf9df87
1 changed files with 5 additions and 2 deletions
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7
lib/gears/shape.lua
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@ -472,8 +472,11 @@ function module.arc(cr, width, height, thickness, start_angle, end_angle, start_
if end_rounded then
arc_length = arc_length - thickness/2
-- And back to angles
end_angle = start_angle + (arc_length/(radius - thickness/2))
-- And back to angles. Also make sure to avoid underflowing when the
-- rounded edge radius is greater than the angle delta.
end_angle = start_angle + math.max(
0, arc_length/(radius - thickness/2)
)
end
-- The path is a curcular arc joining 4 points