mirror of
https://github.com/unidoc/unipdf.git
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Form fill field rotation (#385)
* Refactor text field rotation * Add rotation support for checkbox fields * Add rotation support for combobox fields * Add rotation support for text combobox fields * Add documentation for the applyRotation of the AppearanceStyle
This commit is contained in:
Adrian-George Bostan
GitHub
parent
54e965785b
commit
ca7f479b7c
@ -219,15 +219,15 @@ func genFieldTextAppearance(wa *model.PdfAnnotationWidget, ftxt *model.PdfFieldT
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return nil, err
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}
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width, height := rect.Width(), rect.Height()
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bboxWidth, bboxHeight := width, height
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var rotation float64
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if mkDict, has := core.GetDict(wa.MK); has {
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mkDict, has := core.GetDict(wa.MK)
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if has {
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bsDict, _ := core.GetDict(wa.BS)
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err := style.applyAppearanceCharacteristics(mkDict, bsDict, nil)
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if err != nil {
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return nil, err
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}
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rotation, _ = core.GetNumberAsFloat(mkDict.Get("R"))
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}
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// Get and process the default appearance string (DA) operands.
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@ -252,26 +252,10 @@ func genFieldTextAppearance(wa *model.PdfAnnotationWidget, ftxt *model.PdfFieldT
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cc.Add_BMC("Tx")
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cc.Add_q()
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bboxWidth, bboxHeight := width, height
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if rotation != 0 {
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// Calculate bounding box before rotation.
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revRotation := -rotation
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bbox := draw.Path{Points: []draw.Point{
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draw.NewPoint(0, 0).Rotate(revRotation),
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draw.NewPoint(width, 0).Rotate(revRotation),
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draw.NewPoint(0, height).Rotate(revRotation),
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draw.NewPoint(width, height).Rotate(revRotation),
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}}.GetBoundingBox()
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// Apply rotation if present.
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// Update width and height, as the appearance is generated based on
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// the bounding of the annotation with no rotation.
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width = bbox.Width
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height = bbox.Height
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// Apply rotation.
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cc.RotateDeg(rotation)
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cc.Translate(bbox.X, bbox.Y)
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}
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width, height = style.applyRotation(mkDict, width, height, cc)
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// Graphic state changes.
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cc.Add_BT()
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@ -513,8 +497,10 @@ func genFieldTextCombAppearance(wa *model.PdfAnnotationWidget, ftxt *model.PdfFi
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return nil, err
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}
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width, height := rect.Width(), rect.Height()
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bboxWidth, bboxHeight := width, height
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if mkDict, has := core.GetDict(wa.MK); has {
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mkDict, has := core.GetDict(wa.MK)
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if has {
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bsDict, _ := core.GetDict(wa.BS)
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err := style.applyAppearanceCharacteristics(mkDict, bsDict, nil)
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if err != nil {
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@ -551,6 +537,11 @@ func genFieldTextCombAppearance(wa *model.PdfAnnotationWidget, ftxt *model.PdfFi
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cc.Add_BMC("Tx")
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cc.Add_q()
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// Apply rotation if present.
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// Update width and height, as the appearance is generated based on
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// the bounding of the annotation with no rotation.
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width, height = style.applyRotation(mkDict, width, height, cc)
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// Graphic state changes.
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cc.Add_BT()
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@ -680,7 +671,7 @@ func genFieldTextCombAppearance(wa *model.PdfAnnotationWidget, ftxt *model.PdfFi
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xform := model.NewXObjectForm()
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xform.Resources = resources
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xform.BBox = core.MakeArrayFromFloats([]float64{0, 0, width, height})
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xform.BBox = core.MakeArrayFromFloats([]float64{0, 0, bboxWidth, bboxHeight})
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xform.SetContentStream(cc.Bytes(), defStreamEncoder())
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apDict := core.MakeDict()
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@ -702,6 +693,7 @@ func genFieldCheckboxAppearance(wa *model.PdfAnnotationWidget, fbtn *model.PdfFi
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return nil, err
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}
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width, height := rect.Width(), rect.Height()
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bboxWidth, bboxHeight := width, height
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common.Log.Debug("Checkbox, wa BS: %v", wa.BS)
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@ -710,7 +702,8 @@ func genFieldCheckboxAppearance(wa *model.PdfAnnotationWidget, fbtn *model.PdfFi
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return nil, err
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}
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if mkDict, has := core.GetDict(wa.MK); has {
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mkDict, has := core.GetDict(wa.MK)
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if has {
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bsDict, _ := core.GetDict(wa.BS)
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err := style.applyAppearanceCharacteristics(mkDict, bsDict, zapfdb)
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if err != nil {
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@ -732,6 +725,11 @@ func genFieldCheckboxAppearance(wa *model.PdfAnnotationWidget, fbtn *model.PdfFi
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drawAlignmentReticle(cc, style2, width, height)
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}
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// Apply rotation if present.
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// Update width and height, as the appearance is generated based on
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// the bounding of the annotation with no rotation.
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width, height = style.applyRotation(mkDict, width, height, cc)
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fontsize := style.AutoFontSizeFraction * height
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checkmetrics, ok := zapfdb.GetRuneMetrics(style.CheckmarkRune)
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@ -767,7 +765,7 @@ func genFieldCheckboxAppearance(wa *model.PdfAnnotationWidget, fbtn *model.PdfFi
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xformOn.Resources = model.NewPdfPageResources()
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xformOn.Resources.SetFontByName("ZaDb", zapfdb.ToPdfObject())
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xformOn.BBox = core.MakeArrayFromFloats([]float64{0, 0, width, height})
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xformOn.BBox = core.MakeArrayFromFloats([]float64{0, 0, bboxWidth, bboxHeight})
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xformOn.SetContentStream(cc.Bytes(), defStreamEncoder())
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}
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@ -777,7 +775,7 @@ func genFieldCheckboxAppearance(wa *model.PdfAnnotationWidget, fbtn *model.PdfFi
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if style.BorderSize > 0 {
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drawRect(cc, style, width, height)
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}
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xformOff.BBox = core.MakeArrayFromFloats([]float64{0, 0, width, height})
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xformOff.BBox = core.MakeArrayFromFloats([]float64{0, 0, bboxWidth, bboxHeight})
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xformOff.SetContentStream(cc.Bytes(), defStreamEncoder())
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}
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@ -813,7 +811,8 @@ func genFieldComboboxAppearance(form *model.PdfAcroForm, wa *model.PdfAnnotation
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return nil, err
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}
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if mkDict, has := core.GetDict(wa.MK); has {
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mkDict, has := core.GetDict(wa.MK)
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if has {
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bsDict, _ := core.GetDict(wa.BS)
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err := style.applyAppearanceCharacteristics(mkDict, bsDict, nil)
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if err != nil {
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@ -839,7 +838,7 @@ func genFieldComboboxAppearance(form *model.PdfAcroForm, wa *model.PdfAnnotation
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}
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if len(optstr) > 0 {
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xform, err := makeComboboxTextXObjForm(fch.PdfField, width, height, optstr, style, daOps, form.DR)
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xform, err := makeComboboxTextXObjForm(fch.PdfField, width, height, optstr, style, daOps, form.DR, mkDict)
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if err != nil {
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return nil, err
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}
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@ -857,8 +856,9 @@ func genFieldComboboxAppearance(form *model.PdfAcroForm, wa *model.PdfAnnotation
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// Make a text-based XObj Form.
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func makeComboboxTextXObjForm(field *model.PdfField, width, height float64,
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text string, style AppearanceStyle, daOps *contentstream.ContentStreamOperations,
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dr *model.PdfPageResources) (*model.XObjectForm, error) {
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dr *model.PdfPageResources, mkDict *core.PdfObjectDictionary) (*model.XObjectForm, error) {
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resources := model.NewPdfPageResources()
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bboxWidth, bboxHeight := width, height
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cc := contentstream.NewContentCreator()
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if style.BorderSize > 0 {
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@ -875,6 +875,11 @@ func makeComboboxTextXObjForm(field *model.PdfField, width, height float64,
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// Graphic state changes.
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cc.Add_BT()
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// Apply rotation if present.
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// Update width and height, as the appearance is generated based on
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// the bounding of the annotation with no rotation.
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width, height = style.applyRotation(mkDict, width, height, cc)
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// Process DA operands.
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apFont, hasTf, err := style.processDA(field, daOps, dr, resources, cc)
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if err != nil {
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@ -950,7 +955,7 @@ func makeComboboxTextXObjForm(field *model.PdfField, width, height float64,
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xform := model.NewXObjectForm()
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xform.Resources = resources
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xform.BBox = core.MakeArrayFromFloats([]float64{0, 0, width, height})
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xform.BBox = core.MakeArrayFromFloats([]float64{0, 0, bboxWidth, bboxHeight})
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xform.SetContentStream(cc.Bytes(), defStreamEncoder())
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return xform, nil
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@ -1067,6 +1072,40 @@ func (style *AppearanceStyle) applyAppearanceCharacteristics(mkDict *core.PdfObj
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return nil
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}
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// applyRotation applies the rotation specified by the MK dictionary,
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// if present. The method returns the width and height of the annotation
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// rectangle with no rotation.
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func (style *AppearanceStyle) applyRotation(mkDict *core.PdfObjectDictionary,
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width, height float64, cc *contentstream.ContentCreator) (float64, float64) {
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if !style.AllowMK {
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return width, height
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}
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if mkDict == nil {
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return width, height
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}
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// Extract rotation from the MK dictionary.
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rotation, _ := core.GetNumberAsFloat(mkDict.Get("R"))
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if rotation == 0 {
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return width, height
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}
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// Calculate bounding box before rotation.
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revRotation := -rotation
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bbox := draw.Path{Points: []draw.Point{
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draw.NewPoint(0, 0).Rotate(revRotation),
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draw.NewPoint(width, 0).Rotate(revRotation),
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draw.NewPoint(0, height).Rotate(revRotation),
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draw.NewPoint(width, height).Rotate(revRotation),
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}}.GetBoundingBox()
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// Apply rotation.
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cc.RotateDeg(rotation)
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cc.Translate(bbox.X, bbox.Y)
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return bbox.Width, bbox.Height
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}
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// processDA adds the operands found in the field default appearance stream to
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// the provided content stream creator. It also provides a fallback font, based
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// on the configuration of the AppearanceStyle, if no valid font is specified
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