fix wrong git ignore

internal/pdf/annotator/rectangle.go

@@ -0,0 +1,129 @@
+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"
+)
+
+// A rectangle defined with a specified Width and Height and a lower left corner at (X,Y).  The rectangle can
+// optionally have a border and a filling color.
+// The Width/Height includes the border (if any specified).
+type RectangleAnnotationDef 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 rectangle annotation object that can be added to page PDF annotations.
+func CreateRectangleAnnotation(rectDef RectangleAnnotationDef) (*pdf.PdfAnnotation, error) {
+	rectAnnotation := pdf.NewPdfAnnotationSquare()
+
+	if rectDef.BorderEnabled {
+		r, g, b := rectDef.BorderColor.R(), rectDef.BorderColor.G(), rectDef.BorderColor.B()
+		rectAnnotation.C = pdfcore.MakeArrayFromFloats([]float64{r, g, b})
+		bs := pdf.NewBorderStyle()
+		bs.SetBorderWidth(rectDef.BorderWidth)
+		rectAnnotation.BS = bs.ToPdfObject()
+	}
+
+	if rectDef.FillEnabled {
+		r, g, b := rectDef.FillColor.R(), rectDef.FillColor.G(), rectDef.FillColor.B()
+		rectAnnotation.IC = pdfcore.MakeArrayFromFloats([]float64{r, g, b})
+	} else {
+		rectAnnotation.IC = pdfcore.MakeArrayFromIntegers([]int{}) // No fill.
+	}
+
+	if rectDef.Opacity < 1.0 {
+		rectAnnotation.CA = pdfcore.MakeFloat(rectDef.Opacity)
+	}
+
+	// Make the appearance stream (for uniform appearance).
+	apDict, bbox, err := makeRectangleAnnotationAppearanceStream(rectDef)
+	if err != nil {
+		return nil, err
+	}
+
+	rectAnnotation.AP = apDict
+	rectAnnotation.Rect = pdfcore.MakeArrayFromFloats([]float64{bbox.Llx, bbox.Lly, bbox.Urx, bbox.Ury})
+
+	return rectAnnotation.PdfAnnotation, nil
+
+}
+
+func makeRectangleAnnotationAppearanceStream(rectDef RectangleAnnotationDef) (*pdfcore.PdfObjectDictionary, *pdf.PdfRectangle, error) {
+	form := pdf.NewXObjectForm()
+	form.Resources = pdf.NewPdfPageResources()
+
+	gsName := ""
+	if rectDef.Opacity < 1.0 {
+		// Create graphics state with right opacity.
+		gsState := pdfcore.MakeDict()
+		gsState.Set("ca", pdfcore.MakeFloat(rectDef.Opacity))
+		gsState.Set("CA", pdfcore.MakeFloat(rectDef.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 := drawPdfRectangle(rectDef, 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 drawPdfRectangle(rectDef RectangleAnnotationDef, 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.
+	rect := draw.Rectangle{
+		X:             0,
+		Y:             0,
+		Width:         rectDef.Width,
+		Height:        rectDef.Height,
+		FillEnabled:   rectDef.FillEnabled,
+		FillColor:     rectDef.FillColor,
+		BorderEnabled: rectDef.BorderEnabled,
+		BorderWidth:   2 * rectDef.BorderWidth,
+		BorderColor:   rectDef.BorderColor,
+		Opacity:       rectDef.Opacity,
+	}
+
+	content, localBbox, err := rect.Draw(gsName)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
+	// Bounding box - global page coordinate system (with offset).
+	globalBbox := &pdf.PdfRectangle{}
+	globalBbox.Llx = rectDef.X + localBbox.Llx
+	globalBbox.Lly = rectDef.Y + localBbox.Lly
+	globalBbox.Urx = rectDef.X + localBbox.Urx
+	globalBbox.Ury = rectDef.Y + localBbox.Ury
+
+	return content, localBbox, globalBbox, nil
+}