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72 lines
2.3 KiB
Go
72 lines
2.3 KiB
Go
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package annotator
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import (
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pdfcore "github.com/unidoc/unidoc/pdf/core"
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pdf "github.com/unidoc/unidoc/pdf/model"
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)
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type LineEndingStyle int
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const (
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LineEndingStyleNone LineEndingStyle = 0
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LineEndingStyleArrow LineEndingStyle = 1
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LineEndingStyleButt LineEndingStyle = 2
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)
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type LineAnnotationDef struct {
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X1 float64
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Y1 float64
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X2 float64
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Y2 float64
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LineColor *pdf.PdfColorDeviceRGB
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Opacity float64
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LineWidth float64
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LineEndingStyle1 LineEndingStyle
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LineEndingStyle2 LineEndingStyle
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}
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// Creates a line annotation object that can be added to page PDF annotations.
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func CreateLineAnnotation(lineDef LineAnnotationDef) (*pdf.PdfAnnotation, error) {
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// Line annotation.
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lineAnnotation := pdf.NewPdfAnnotationLine()
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// Line endpoint locations.
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lineAnnotation.L = pdfcore.MakeArrayFromFloats([]float64{lineDef.X1, lineDef.Y1, lineDef.X2, lineDef.Y2})
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// Line endings.
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le1 := pdfcore.MakeName("None")
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if lineDef.LineEndingStyle1 == LineEndingStyleArrow {
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le1 = pdfcore.MakeName("ClosedArrow")
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}
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le2 := pdfcore.MakeName("None")
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if lineDef.LineEndingStyle2 == LineEndingStyleArrow {
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le2 = pdfcore.MakeName("ClosedArrow")
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}
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lineAnnotation.LE = pdfcore.MakeArray(le1, le2)
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// Opacity.
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if lineDef.Opacity < 1.0 {
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lineAnnotation.CA = pdfcore.MakeFloat(lineDef.Opacity)
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}
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r, g, b := lineDef.LineColor.R(), lineDef.LineColor.G(), lineDef.LineColor.B()
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lineAnnotation.IC = pdfcore.MakeArrayFromFloats([]float64{r, g, b}) // fill color of line endings, rgb 0-1.
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lineAnnotation.C = pdfcore.MakeArrayFromFloats([]float64{r, g, b}) // line color, rgb 0-1.
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bs := pdf.NewBorderStyle()
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bs.SetBorderWidth(lineDef.LineWidth) // Line width: 3 points.
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lineAnnotation.BS = bs.ToPdfObject()
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// Make the appearance stream (for uniform appearance).
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apDict, bbox, err := makeLineAnnotationAppearanceStream(lineDef)
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if err != nil {
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return nil, err
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}
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lineAnnotation.AP = apDict
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// The rect specifies the location and dimensions of the annotation. Technically if the annotation could not
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// be displayed if it goes outside these bounds, although rarely enforced.
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lineAnnotation.Rect = pdfcore.MakeArrayFromFloats([]float64{bbox.Llx, bbox.Lly, bbox.Urx, bbox.Ury})
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return lineAnnotation.PdfAnnotation, nil
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}
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