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fixed a bug with anticlockwise arcs

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This commit is contained in:
Thomas Friedel 2018-02-06 11:33:20 +01:00
parent e5bdee1d67
commit 9b5004d6b9
1 changed files with 10 additions and 3 deletions
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13
paths.go
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@ -95,9 +95,16 @@ func (cv *Canvas) Arc(x, y, radius, startAngle, endAngle float32, anticlockwise
if step > 0.8 { if step > 0.8 {
step = 0.8 step = 0.8
} }
for a := startAngle; a < endAngle; a += step { if anticlockwise {
s, c := fmath.Sincos(a) for a := startAngle; a > endAngle; a -= step {
cv.LineTo(x+radius*c, y+radius*s) s, c := fmath.Sincos(a)
cv.LineTo(x+radius*c, y+radius*s)
}
} else {
for a := startAngle; a < endAngle; a += step {
s, c := fmath.Sincos(a)
cv.LineTo(x+radius*c, y+radius*s)
}
} }
s, c := fmath.Sincos(endAngle) s, c := fmath.Sincos(endAngle)
cv.LineTo(x+radius*c, y+radius*s) cv.LineTo(x+radius*c, y+radius*s)