Question

我用来强调选择文本的代码。我开始调用addUnderline（）方法，其他方法是辅助方法。

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();
                }
            }
        }

如果您仔细观察某些线条比其他线条更粗或更薄，您可以在图像中看到。这可以解决吗？顺便说一句，当我放大/缩小时，问题就消失了......

Answer 1

您需要在pdf视图控件上设置以下内容：

Class: Data Structures | Number Of Students: 7
Students In Course One  Capacity: 10
0 Peter Jones
1 Lisa Walker
2 Kevin Medara
3 Joe Sansone
4 Shari Bemis
5 Vishnu
6 Kieth Naeck
7 NEW STUDENT 1
_____________________________________
Class: Database Systems | Number Of Students: 6
Students In Course Two  Capacity: 15
0 Jacob Fraser
1 Bob Walker
2 Kevin Medara
3 Joe Sansone
4 Shari Bemis
5 Melissa Johnson
6 
______________________________________
Class: Data Structures | Number Of Students: 12
Students In Course Three  Capacity: 20
0 Peter Jones
1 Lisa Walker
2 Kevin Medara
3 Joe Sansone
4 Shari Bemis
5 Vishnu
6 Kieth Naeck
7 NEW STUDENT 1
8 NEW STUDENT 2
9 NEW STUDENT 3
10 NEW STUDENT 4
11 NEW STUDENT 5
12 
_____________________________________
Course One after dropping myself
Class: Data Structures | Number Of Students: 6
Students In Course One  Capacity: 10
0 Peter Jones
1 Lisa Walker
2 Joe Sansone
3 Shari Bemis
4 Vishnu
5 Kieth Naeck
_____________________________________
Cleared Course One
Class: Data Structures | Number Of Students: 0
Students In Course One  Capacity: 10
0  
_____________________________________
Course 3 After Dropping Shari Bemis
Class: Data Structures | Number Of Students: 11
Students In Course Three  Capacity: 20
0 Peter Jones
1 Lisa Walker
2 Kevin Medara
3 Joe Sansone
4 Vishnu
5 Kieth Naeck
6 NEW STUDENT 1
7 NEW STUDENT 2
8 NEW STUDENT 3
9 NEW STUDENT 4
10 NEW STUDENT 5
11 
_____________________________________

这将删除行上的别名，并表示1.5px的所有行都是1px，依此类推。见这里：https://www.pdftron.com/pdfnet/mobile/docs/WinRT/html/M_pdftron_PDF_PDFViewCtrl_SetThinLineAdjustment.htm

使用pdfnet加下划线会导致不同的线条粗细

1 个答案: