Method ToScanxScanner

path.go:2526–2568

ToScanxScanner rasterizes the path to *scanx.Scanner using the given rasterizer, height, and resolution.

(ras *scanx.Scanner, dy float64, resolution Resolution)

// ToScanxScanner rasterizes the path to *scanx.Scanner using the given rasterizer, height, and resolution.
func (p *Path) ToScanxScanner(ras *scanx.Scanner, dy float64, resolution Resolution) {
	dpmm := resolution.DPMM()
	tolerance := PixelTolerance / dpmm // tolerance of 1/10 of a pixel
	for i := 0; i < len(p.d); {
		cmd := p.d[i]
		switch cmd {
		case MoveToCmd:
			ras.Start(fixedPoint26_6(p.d[i+1]*dpmm, dy-p.d[i+2]*dpmm))
		case LineToCmd:
			ras.Line(fixedPoint26_6(p.d[i+1]*dpmm, dy-p.d[i+2]*dpmm))
		case QuadToCmd, CubeToCmd, ArcToCmd:
			// flatten
			var q *Path
			var start Point
			if 0 < i {
				start = Point{p.d[i-3], p.d[i-2]}
			}
			if cmd == QuadToCmd {
				cp := Point{p.d[i+1], p.d[i+2]}
				end := Point{p.d[i+3], p.d[i+4]}
				q = flattenQuadraticBezier(start, cp, end, tolerance)
			} else if cmd == CubeToCmd {
				cp1 := Point{p.d[i+1], p.d[i+2]}
				cp2 := Point{p.d[i+3], p.d[i+4]}
				end := Point{p.d[i+5], p.d[i+6]}
				q = flattenCubicBezier(start, cp1, cp2, end, tolerance)
			} else {
				rx, ry, phi := p.d[i+1], p.d[i+2], p.d[i+3]
				large, sweep := toArcFlags(p.d[i+4])
				end := Point{p.d[i+5], p.d[i+6]}
				q = flattenEllipticArc(start, rx, ry, phi, large, sweep, end, tolerance)
			}
			for j := 4; j < len(q.d); j += 4 {
				ras.Line(fixedPoint26_6(q.d[j+1]*dpmm, dy-q.d[j+2]*dpmm))
			}
		case CloseCmd:
			ras.Line(fixedPoint26_6(p.d[i+1]*dpmm, dy-p.d[i+2]*dpmm))
		default:
			panic("quadratic and cubic Béziers and arcs should have been replaced")
		}
		i += cmdLen(cmd)
	}
}