fix wrong git ignore

internal/pdf/contentstream/draw/bezier_curve.go

@@ -0,0 +1,149 @@
+package draw
+
+import (
+	"math"
+
+	"gitea.tecamino.com/paadi/pdfmerge/internal/pdf/model"
+)
+
+// Cubic bezier curves are defined by:
+// R(t) = P0*(1-t)^3 + P1*3*t*(1-t)^2 + P2*3*t^2*(1-t) + P3*t^3
+// where P0 is the current point, P1, P2 control points and P3 the final point.
+type CubicBezierCurve struct {
+	P0 Point // Starting point.
+	P1 Point // Control point 1.
+	P2 Point // Control point 2.
+	P3 Point // Final point.
+}
+
+func NewCubicBezierCurve(x0, y0, x1, y1, x2, y2, x3, y3 float64) CubicBezierCurve {
+	curve := CubicBezierCurve{}
+	curve.P0 = NewPoint(x0, y0)
+	curve.P1 = NewPoint(x1, y1)
+	curve.P2 = NewPoint(x2, y2)
+	curve.P3 = NewPoint(x3, y3)
+	return curve
+}
+
+// Add X,Y offset to all points on a curve.
+func (curve CubicBezierCurve) AddOffsetXY(offX, offY float64) CubicBezierCurve {
+	curve.P0.X += offX
+	curve.P1.X += offX
+	curve.P2.X += offX
+	curve.P3.X += offX
+
+	curve.P0.Y += offY
+	curve.P1.Y += offY
+	curve.P2.Y += offY
+	curve.P3.Y += offY
+
+	return curve
+}
+
+func (curve CubicBezierCurve) GetBounds() model.PdfRectangle {
+	minX := curve.P0.X
+	maxX := curve.P0.X
+	minY := curve.P0.Y
+	maxY := curve.P0.Y
+
+	// 1000 points.
+	for t := 0.0; t <= 1.0; t += 0.001 {
+		Rx := curve.P0.X*math.Pow(1-t, 3) +
+			curve.P1.X*3*t*math.Pow(1-t, 2) +
+			curve.P2.X*3*math.Pow(t, 2)*(1-t) +
+			curve.P3.X*math.Pow(t, 3)
+		Ry := curve.P0.Y*math.Pow(1-t, 3) +
+			curve.P1.Y*3*t*math.Pow(1-t, 2) +
+			curve.P2.Y*3*math.Pow(t, 2)*(1-t) +
+			curve.P3.Y*math.Pow(t, 3)
+
+		if Rx < minX {
+			minX = Rx
+		}
+		if Rx > maxX {
+			maxX = Rx
+		}
+		if Ry < minY {
+			minY = Ry
+		}
+		if Ry > maxY {
+			maxY = Ry
+		}
+	}
+
+	bounds := model.PdfRectangle{}
+	bounds.Llx = minX
+	bounds.Lly = minY
+	bounds.Urx = maxX
+	bounds.Ury = maxY
+	return bounds
+}
+
+type CubicBezierPath struct {
+	Curves []CubicBezierCurve
+}
+
+func NewCubicBezierPath() CubicBezierPath {
+	bpath := CubicBezierPath{}
+	bpath.Curves = []CubicBezierCurve{}
+	return bpath
+}
+
+func (this CubicBezierPath) AppendCurve(curve CubicBezierCurve) CubicBezierPath {
+	this.Curves = append(this.Curves, curve)
+	return this
+}
+
+func (bpath CubicBezierPath) Copy() CubicBezierPath {
+	bpathcopy := CubicBezierPath{}
+	bpathcopy.Curves = []CubicBezierCurve{}
+	for _, c := range bpath.Curves {
+		bpathcopy.Curves = append(bpathcopy.Curves, c)
+	}
+	return bpathcopy
+}
+
+func (bpath CubicBezierPath) Offset(offX, offY float64) CubicBezierPath {
+	for i, c := range bpath.Curves {
+		bpath.Curves[i] = c.AddOffsetXY(offX, offY)
+	}
+	return bpath
+}
+
+func (bpath CubicBezierPath) GetBoundingBox() Rectangle {
+	bbox := Rectangle{}
+
+	minX := 0.0
+	maxX := 0.0
+	minY := 0.0
+	maxY := 0.0
+	for idx, c := range bpath.Curves {
+		curveBounds := c.GetBounds()
+		if idx == 0 {
+			minX = curveBounds.Llx
+			maxX = curveBounds.Urx
+			minY = curveBounds.Lly
+			maxY = curveBounds.Ury
+			continue
+		}
+
+		if curveBounds.Llx < minX {
+			minX = curveBounds.Llx
+		}
+		if curveBounds.Urx > maxX {
+			maxX = curveBounds.Urx
+		}
+		if curveBounds.Lly < minY {
+			minY = curveBounds.Lly
+		}
+		if curveBounds.Ury > maxY {
+			maxY = curveBounds.Ury
+		}
+	}
+
+	bbox.X = minX
+	bbox.Y = minY
+	bbox.Width = maxX - minX
+	bbox.Height = maxY - minY
+	return bbox
+}