Fix Capper & Joiner bugs introduced by 856a70c
Some constants were not updated properly when switching from raster.Point to fixed.26_6
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@ -47,8 +47,8 @@ var RoundCapper Capper = CapperFunc(roundCapper)
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func roundCapper(p Adder, halfWidth fixed.Int26_6, pivot, n1 fixed.Point26_6) {
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// The cubic Bézier approximation to a circle involves the magic number
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// (√2 - 1) * 4/3, which is approximately 141/256.
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const k = 141
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// (√2 - 1) * 4/3, which is approximately 35/64.
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const k = 35
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e := pRot90CCW(n1)
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side := pivot.Add(e)
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start, end := pivot.Sub(n1), pivot.Add(n1)
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@ -111,8 +111,8 @@ func addArc(p Adder, pivot, n0, n1 fixed.Point26_6) {
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// We approximate the arc by 0, 1, 2 or 3 45-degree quadratic segments plus
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// a final quadratic segment from s to n1. Each 45-degree segment has
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// control points {1, 0}, {1, tan(π/8)} and {1/√2, 1/√2} suitably scaled,
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// rotated and translated. tan(π/8) is approximately 106/256.
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const tpo8 = 106
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// rotated and translated. tan(π/8) is approximately 27/64.
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const tpo8 = 27
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var s fixed.Point26_6
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// We determine which octant the angle between n0 and n1 is in via three
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// dot products. m0, m1 and m2 are n0 rotated clockwise by 45, 90 and 135
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