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Merge pull request #755 from jwilk-forks/atan2

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Simplify angle calculation in ogl.LineShape.DrawArrow()
This commit is contained in:
Robin Dunn
2018-02-22 22:20:17 -08:00
parent c343f835fc
commit 7a6a64d26d
1 changed files with 1 additions and 15 deletions
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16
wx/lib/ogl/lines.py
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@@ -923,26 +923,12 @@ class LineShape(Shape):
# | /(x1, y1)
# |______________________
#
theta = 0.0
x1 = startPositionX
y1 = startPositionY
x2 = float(positionOnLineX)
y2 = float(positionOnLineY)
if x1 == x2 and y1 == y2:
theta = 0.0
elif x1 == x2 and y1 > y2:
theta = 3.0 * math.pi / 2.0
elif x1 == x2 and y2 > y1:
theta = math.pi / 2.0
elif x2 > x1 and y2 >= y1:
theta = math.atan((y2 - y1) / (x2 - x1))
elif x2 < x1:
theta = math.pi + math.atan((y2 - y1) / (x2 - x1))
elif x2 > x1 and y2 < y1:
theta = 2 * math.pi + math.atan((y2 - y1) / (x2 - x1))
else:
raise "Unknown arrowhead rotation case"
theta = math.atan2(y2 - y1, x2 - x1) % (2 * math.pi)
# Rotate about the centre of the object, then place
# the object on the line.