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This is a subclass of GD::Polygon used to draw an arrow between two vertices.
GD::Arrow::Full draws a full arrow between two verticies.
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+----------------------+ \
(X2, Y2) * * (X1, Y1)
+----------------------+ /
|/
GD::Arrow::RightHalf draws a half arrow between two verticies.
(X2, Y2) *-------------------------* (X1, Y1)
+----------------------+ /
|/
GD::Arrow::LeftHalf draws a half arrow between two verticies.
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+----------------------+ \
(X2, Y2) *-------------------------* (X1, Y1)
WWW: https://metacpan.org/release/GD-Arrow
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