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Dim caneta As New Pen(Color.FromArgb(127, 0, 100, 10), 40)
path.FillMode = Drawing2D.FillMode.Winding
e.Graphics.DrawPath(caneta, path)
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d.x = b.x - a.x
d.y = b.y - a.y
distance = sqrt (d.x * d.x + d.y * d.y)
nab.x = d.x / distance;
nab.y = d.y / distance;
sine = (nab.y * nbc.x) + (-nab.x * nbc.y)
cosine = (nab.x * nbc.x) + (nab.y * nbc.y)
The sine will be zero if a, b and c make a line. It will be positive or negative if the path bends left or right. The cosine will be negative if the path bends more than 90 degrees left or right.
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