選択したテキストに下線を引くために使用するコード。addUnderline() メソッドの呼び出しを開始します。他のメソッドはヘルパー メソッドです。
private pdftron.SDF.Obj CreateUnderlineAppearance(pdftron.PDF.Rect bbox)
{
ElementBuilder builder = new ElementBuilder();
ElementWriter writer = new ElementWriter();
builder.PathBegin();
builder.MoveTo(bbox.x1, bbox.y1);
builder.LineTo(bbox.x2, bbox.y1);
Element line = builder.PathEnd();
//Set color attributes for the line...
line.SetPathFill(false);
line.SetPathStroke(true);
GState gs = line.GetGState();
gs.SetStrokeColorSpace(ColorSpace.CreateDeviceRGB());
gs.SetStrokeColor(new ColorPt(0, 0, 0)); // black
gs.SetLineWidth(2);
writer.Begin(m_document);
writer.WriteElement(line);
pdftron.SDF.Obj stm = writer.End();
builder.Dispose();
writer.Dispose();
// Set the bounding box
stm.PutRect("BBox", bbox.x1, bbox.y1, bbox.x2, bbox.y2);
stm.PutName("Subtype", "Form");
return stm;
}
public Annot CreateUnderlineAnnot(pdftron.PDF.Rect rect)
{
Annot underlineAnnot = Annot.Create(m_document, Annot.Type.e_Underline, rect);
underlineAnnot.SetAppearance(CreateUnderlineAppearance(rect));
return underlineAnnot;
}
public void AddUnderline()
{
if (m_document != null)
{
PDFViewCtrl.Selection selection = m_pdfViewer.GetSelection();
int pageNumber = selection.GetPageNum();
double[] quads = selection.GetQuads();
int numQuads = quads.Length / 8;
if (quads.Length % 8 == 0) //must have at least 8 points to be valid
{
Console.WriteLine("GetRectsFromQuads - numQuads: " + numQuads.ToString());
for (int i = 0; i < numQuads; i++)
{
Rect selectionRect = GetSelectionRect(ref quads, i);
//Console.WriteLine("GetRectsFromQuads - aRect: " + rectX1.ToString() + " | " + rectY1.ToString() + " | " + rectX2.ToString() + " | " + rectY2.ToString());
Annot underlineAnnot = CreateUnderlineAnnot(selectionRect);
m_pdfViewer.AddUnderlineAnnotationToPage(underlineAnnot, pageNumber);
//m_pdfViewer.Refresh(); --> to see how this algorithm works when debugging
}
m_pdfViewer.RefreshAnnotations();
}
}
}
画像をよく見ると、一部の線が他の線よりも太かったり細かったりすることがわかります。これは修正可能ですか?ちなみに、ズームイン/ズームアウトすると問題はなくなりました...