mirror of
https://github.com/unidoc/unipdf.git
synced 2025-04-29 13:48:54 +08:00
112 lines
3.3 KiB
Go
112 lines
3.3 KiB
Go
/*
|
|
* This file is subject to the terms and conditions defined in
|
|
* file 'LICENSE.md', which is part of this source code package.
|
|
*/
|
|
|
|
package annotator
|
|
|
|
import (
|
|
"github.com/unidoc/unidoc/common"
|
|
|
|
pdfcontent "github.com/unidoc/unidoc/pdf/contentstream"
|
|
"github.com/unidoc/unidoc/pdf/contentstream/draw"
|
|
pdfcore "github.com/unidoc/unidoc/pdf/core"
|
|
pdf "github.com/unidoc/unidoc/pdf/model"
|
|
)
|
|
|
|
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.PdfObjectDictionary{}
|
|
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.PdfObjectDictionary{}
|
|
apDict.Set("N", form.ToPdfObject())
|
|
|
|
return apDict, globalBbox, nil
|
|
}
|
|
|
|
func drawPdfRectangle(rectDef RectangleAnnotationDef, gsName string) ([]byte, *pdf.PdfRectangle, *pdf.PdfRectangle, error) {
|
|
path := draw.NewPath()
|
|
|
|
path = path.AppendPoint(draw.NewPoint(0, 0))
|
|
path = path.AppendPoint(draw.NewPoint(0, rectDef.Height))
|
|
path = path.AppendPoint(draw.NewPoint(rectDef.Width, rectDef.Height))
|
|
path = path.AppendPoint(draw.NewPoint(rectDef.Width, 0))
|
|
path = path.AppendPoint(draw.NewPoint(0, 0))
|
|
|
|
creator := pdfcontent.NewContentCreator()
|
|
|
|
creator.Add_q()
|
|
if rectDef.FillEnabled {
|
|
creator.Add_rg(rectDef.FillColor.R(), rectDef.FillColor.G(), rectDef.FillColor.B())
|
|
}
|
|
if rectDef.BorderEnabled {
|
|
creator.Add_RG(rectDef.BorderColor.R(), rectDef.BorderColor.G(), rectDef.BorderColor.B())
|
|
creator.Add_w(rectDef.BorderWidth)
|
|
}
|
|
if len(gsName) > 1 {
|
|
// If a graphics state is provided, use it. (Used for transparency settings here).
|
|
creator.Add_gs(pdfcore.PdfObjectName(gsName))
|
|
}
|
|
drawPathWithCreator(path, creator)
|
|
|
|
if rectDef.FillEnabled && rectDef.BorderEnabled {
|
|
creator.Add_B() // fill and stroke.
|
|
} else if rectDef.FillEnabled {
|
|
creator.Add_f() // Fill.
|
|
} else if rectDef.BorderEnabled {
|
|
creator.Add_S() // Stroke.
|
|
}
|
|
creator.Add_Q()
|
|
|
|
// Offsets (needed for placement of annotations bbox).
|
|
offX := rectDef.X
|
|
offY := rectDef.Y
|
|
|
|
// Get bounding box.
|
|
pathBbox := path.GetBoundingBox()
|
|
|
|
// 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
|
|
}
|