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Merge branch 'v2' of https://github.com/unidoc/unidoc into up_v2_dev

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* 'v2' of https://github.com/unidoc/unidoc:
  Coordinate system fix for line annotation (global vs local Form vs Page)
This commit is contained in:
Peter Williams 2017-04-10 14:55:23 +10:00
commit 38d9bd73ef
1 changed files with 25 additions and 10 deletions
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35
pdf/annotator/line.go
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@ -39,7 +39,7 @@ func makeLineAnnotationAppearanceStream(lineDef LineAnnotationDef) (*pdfcore.Pdf
gsName = "gs1"
}
content, linebbox, err := drawPdfLine(lineDef, gsName)
content, localBbox, globalBbox, err := drawPdfLine(lineDef, gsName)
if err != nil {
return nil, nil, err
}
@ -49,16 +49,18 @@ func makeLineAnnotationAppearanceStream(lineDef LineAnnotationDef) (*pdfcore.Pdf
return nil, nil, err
}
form.BBox = linebbox.ToPdfObject()
// Local bounding box for the XObject Form.
form.BBox = localBbox.ToPdfObject()
apDict := &pdfcore.PdfObjectDictionary{}
apDict.Set("N", form.ToPdfObject())
return apDict, linebbox, nil
return apDict, globalBbox, nil
}
// Draw a line in PDF. Generates the content stream which can be used in page contents or appearance stream of annotation.
func drawPdfLine(lineDef LineAnnotationDef, gsName string) ([]byte, *pdf.PdfRectangle, error) {
// Returns the stream content, XForm bounding box (local), Rect bounding box (global/page) and an error if one occurred.
func drawPdfLine(lineDef LineAnnotationDef, gsName string) ([]byte, *pdf.PdfRectangle, *pdf.PdfRectangle, error) {
x1, x2 := lineDef.X1, lineDef.X2
y1, y2 := lineDef.Y1, lineDef.Y2
@ -184,6 +186,7 @@ func drawPdfLine(lineDef LineAnnotationDef, gsName string) ([]byte, *pdf.PdfRect
}
pathBbox := path.GetBoundingBox()
creator := pdfcontent.NewContentCreator()
// Draw line with arrow
@ -199,11 +202,23 @@ func drawPdfLine(lineDef LineAnnotationDef, gsName string) ([]byte, *pdf.PdfRect
//creator.Add_S().
Add_Q()
bbox := &pdf.PdfRectangle{}
bbox.Llx = pathBbox.X
bbox.Lly = pathBbox.Y
bbox.Urx = pathBbox.X + pathBbox.Width
bbox.Ury = pathBbox.Y + pathBbox.Height
// Offsets (needed for placement of annotations bbox).
offX := x1 - VsX
offY := y1 - VsY
return creator.Bytes(), bbox, nil
// Bounding box - local coordinate system (without offset).
localBbox := &pdf.PdfRectangle{}
localBbox.Llx = pathBbox.X
localBbox.Lly = pathBbox.Y
localBbox.Urx = pathBbox.X + pathBbox.Width
localBbox.Ury = pathBbox.Y + pathBbox.Height
// Bounding box - global page coordinate system (with offset).
globalBbox := &pdf.PdfRectangle{}
globalBbox.Llx = offX + pathBbox.X
globalBbox.Lly = offY + pathBbox.Y
globalBbox.Urx = offX + pathBbox.X + pathBbox.Width
globalBbox.Ury = offY + pathBbox.Y + pathBbox.Height
return creator.Bytes(), localBbox, globalBbox, nil
}