fix wrong git ignore

internal/pdf/annotator/circle.go

@@ -0,0 +1,126 @@
+package annotator
+
+import (
+	"gitea.tecamino.com/paadi/pdfmerge/internal/pdf/common"
+
+	"gitea.tecamino.com/paadi/pdfmerge/internal/pdf/contentstream/draw"
+	pdfcore "gitea.tecamino.com/paadi/pdfmerge/internal/pdf/core"
+	pdf "gitea.tecamino.com/paadi/pdfmerge/internal/pdf/model"
+)
+
+type CircleAnnotationDef struct {
+	X             float64
+	Y             float64
+	Width         float64
+	Height        float64
+	FillEnabled   bool // Show fill?
+	FillColor     *pdf.PdfColorDeviceRGB
+	BorderEnabled bool // Show border?
+	BorderWidth   float64
+	BorderColor   *pdf.PdfColorDeviceRGB
+	Opacity       float64 // Alpha value (0-1).
+}
+
+// Creates a circle/ellipse annotation object with appearance stream that can be added to page PDF annotations.
+func CreateCircleAnnotation(circDef CircleAnnotationDef) (*pdf.PdfAnnotation, error) {
+	circAnnotation := pdf.NewPdfAnnotationCircle()
+
+	if circDef.BorderEnabled {
+		r, g, b := circDef.BorderColor.R(), circDef.BorderColor.G(), circDef.BorderColor.B()
+		circAnnotation.C = pdfcore.MakeArrayFromFloats([]float64{r, g, b})
+		bs := pdf.NewBorderStyle()
+		bs.SetBorderWidth(circDef.BorderWidth)
+		circAnnotation.BS = bs.ToPdfObject()
+	}
+
+	if circDef.FillEnabled {
+		r, g, b := circDef.FillColor.R(), circDef.FillColor.G(), circDef.FillColor.B()
+		circAnnotation.IC = pdfcore.MakeArrayFromFloats([]float64{r, g, b})
+	} else {
+		circAnnotation.IC = pdfcore.MakeArrayFromIntegers([]int{}) // No fill.
+	}
+
+	if circDef.Opacity < 1.0 {
+		circAnnotation.CA = pdfcore.MakeFloat(circDef.Opacity)
+	}
+
+	// Make the appearance stream (for uniform appearance).
+	apDict, bbox, err := makeCircleAnnotationAppearanceStream(circDef)
+	if err != nil {
+		return nil, err
+	}
+
+	circAnnotation.AP = apDict
+	circAnnotation.Rect = pdfcore.MakeArrayFromFloats([]float64{bbox.Llx, bbox.Lly, bbox.Urx, bbox.Ury})
+
+	return circAnnotation.PdfAnnotation, nil
+
+}
+
+func makeCircleAnnotationAppearanceStream(circDef CircleAnnotationDef) (*pdfcore.PdfObjectDictionary, *pdf.PdfRectangle, error) {
+	form := pdf.NewXObjectForm()
+	form.Resources = pdf.NewPdfPageResources()
+
+	gsName := ""
+	if circDef.Opacity < 1.0 {
+		// Create graphics state with right opacity.
+		gsState := pdfcore.MakeDict()
+		gsState.Set("ca", pdfcore.MakeFloat(circDef.Opacity))
+		gsState.Set("CA", pdfcore.MakeFloat(circDef.Opacity))
+		err := form.Resources.AddExtGState("gs1", gsState)
+		if err != nil {
+			common.Log.Debug("Unable to add extgstate gs1")
+			return nil, nil, err
+		}
+
+		gsName = "gs1"
+	}
+
+	content, localBbox, globalBbox, err := drawPdfCircle(circDef, gsName)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	err = form.SetContentStream(content, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// Local bounding box for the XObject Form.
+	form.BBox = localBbox.ToPdfObject()
+
+	apDict := pdfcore.MakeDict()
+	apDict.Set("N", form.ToPdfObject())
+
+	return apDict, globalBbox, nil
+}
+
+func drawPdfCircle(circDef CircleAnnotationDef, gsName string) ([]byte, *pdf.PdfRectangle, *pdf.PdfRectangle, error) {
+	// The annotation is drawn locally in a relative coordinate system with 0,0 as the origin rather than an offset.
+	circle := draw.Circle{
+		X:             circDef.X,
+		Y:             circDef.Y,
+		Width:         circDef.Width,
+		Height:        circDef.Height,
+		FillEnabled:   circDef.FillEnabled,
+		FillColor:     circDef.FillColor,
+		BorderEnabled: circDef.BorderEnabled,
+		BorderWidth:   circDef.BorderWidth,
+		BorderColor:   circDef.BorderColor,
+		Opacity:       circDef.Opacity,
+	}
+
+	content, localBbox, err := circle.Draw(gsName)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
+	// Bounding box - global page coordinate system (with offset).
+	globalBbox := &pdf.PdfRectangle{}
+	globalBbox.Llx = circDef.X + localBbox.Llx
+	globalBbox.Lly = circDef.Y + localBbox.Lly
+	globalBbox.Urx = circDef.X + localBbox.Urx
+	globalBbox.Ury = circDef.Y + localBbox.Ury
+
+	return content, localBbox, globalBbox, nil
+}