圆角桌子

Question

我想知道使用iTextSharp 5.x +库在pdf中创建具有圆角的表的最佳方法是什么。

Answer 1

如果您有iTextSharp源代码，请将以下内容添加到PdfContentByte类：

/// <summary>
        /// Enumuration for defining corners you want rounded.
        /// </summary>
        [Flags()]
        public enum Corners {None = 0,All=15,Top=3,Bottom=12, TopLeft = 1, TopRight=2, BottomLeft=4, BottomRight=8};

        /// <summary>
        /// Adds a round rectangle to the current path, with rounded conrners as specified by roundCorners.
        /// </summary>
        /// <param name="x"></param>
        /// <param name="y"></param>
        /// <param name="w"></param>
        /// <param name="h"></param>
        /// <param name="r"></param>
        /// <param name="roundCorners"></param>
        public void RoundRectangle(float x, float y, float w, float h, float r,Corners roundCorners)
        {
            if (w < 0)
            {
                x += w;
                w = -w;
            }
            if (h < 0)
            {
                y += h;
                h = -h;
            }
            if (r < 0)
                r = -r;
            float b = 0.4477f;
            if((roundCorners & Corners.BottomLeft) == Corners.BottomLeft)
                MoveTo(x + r, y);
            else
                MoveTo(x, y);

            if ((roundCorners & Corners.BottomRight) == Corners.BottomRight)
            {
                LineTo(x + w - r, y);
                CurveTo(x + w - r * b, y, x + w, y + r * b, x + w, y + r);
            }
            else
                LineTo(x + w, y);

            if ((roundCorners & Corners.TopRight ) == Corners.TopRight)
            {
                LineTo(x + w, y + h - r);
                CurveTo(x + w, y + h - r * b, x + w - r * b, y + h, x + w - r, y + h);
            }
            else
                LineTo(x + w, y + h);

            if ((roundCorners & Corners.TopLeft)  == Corners.TopLeft)
            {
                LineTo(x + r, y + h);
                CurveTo(x + r * b, y + h, x, y + h - r * b, x, y + h - r);
            }
            else
                LineTo(x , y + h);

            if ((roundCorners & Corners.BottomLeft) == Corners.BottomLeft)
            {
                LineTo(x, y + r);
                CurveTo(x, y + r * b, x + r * b, y, x + r, y);
            }else
                LineTo(x, y);
        }        

下一步是实施IPdfPCellEvent接口：

public class myCellEvent : IPdfPCellEvent
    {
        #region members
        PdfContentByte.Corners _roundedCorners;
        float _roundness;
        #endregion

        #region ctor
        public myCellEvent()
            :this( PdfContentByte.Corners.All,2f)
        {

        }

        public myCellEvent(PdfContentByte.Corners roundedCorners)
            : this(roundedCorners, 2f)
        {

        }

        public myCellEvent(PdfContentByte.Corners roundedCorners,float roundness)
        {
            _roundedCorners = roundedCorners;
            _roundness = roundness;

        } 
        #endregion

        #region IPdfPCellEvent Members
        public void CellLayout(PdfPCell cell, Rectangle position, PdfContentByte[] canvases)
        {
            PdfContentByte cb = canvases[PdfPTable.LINECANVAS];
            cb.RoundRectangle(position.Left, position.Bottom, position.Right - position.Left, position.Top - position.Bottom, this._roundness, this._roundedCorners);
            cb.SetColorStroke(new BaseColor(System.Drawing.Color.Black));
            cb.SetColorFill(new BaseColor(System.Drawing.Color.Beige));            
            cb.FillStroke();
            cb.Stroke();
        }
        #endregion
    }

然后你绕过想要产生圆形表的角落：

PdfPTable table = new PdfPTable(1);


                PdfPCell cell = new PdfPCell(new Phrase(10, atext, f2));
                cell.Border = 0;
                cell.Padding = 5f;
                cell.CellEvent = new myCellEvent(PdfContentByte.Corners.Top,2f);
                table.AddCell(cell);

如果您喜欢这个答案......请投票：）

Answer 2

无法创建带圆角的iTextSharp PdfPTable，但您可以使用PdfContentByte.RoundRectangle()方法绘制带圆角的表格边框。

以下是一个演示此内容的摘录：

Document doc = new Document();
using (FileStream fs = new FileStream("RoundRectangle Demo.pdf", FileMode.Create)) {
PdfWriter writer = PdfWriter.GetInstance(doc, fs);
    doc.Open();
    PdfContentByte cb = writer.DirectContent;

    // Bottom left coordinates x & y, followed by width, height and radius of corners.
    cb.RoundRectangle(100f, 500f, 200f, 200f, 2f);
    cb.Stroke();

    doc.Close();
}

此代码段是我在www.mikesdotnetting.com上的文章iTextSharp - Drawing shapes and Graphics中找到的代码的精简版本。如果你还没有，你会想仔细看看他的其他文章。

Answer 3

我认为如果你想要一个带圆角的桌子，你会在你的桌子上寻找一些华丽（或至少漂亮）的格式。如果是这种情况，我建议关闭iTextSharp表中的所有边框，并使用图形图像作为页面上的背景。然后，您可以根据需要将图形背景设置为复杂和花哨（阴影，渐变，圆角等），而不会遇到任何麻烦。然后，将表格与背景图像对齐。

如果您的数据格式经常发生变化，您将不希望使用此方法。

Answer 4

私有函数pdfDIF（）作为Byte（）      昏暗的celevent作为新的PdfPCellEvent

 Dim tableImportes As New PdfPTable(1)
 tableImportes.SetTotalWidth({10 * dpixcm})

 Dim cellImportes = New PdfPCell(New Phrase("IMPORTE", COURIER9Bold))            
 cellImportes.BorderWidth = 0
 cellImportes.HorizontalAlignment = Element.ALIGN_CENTER
 cellImportes.CellEvent = celevent
 tableImportes.AddCell(cellImportes)

结束功能

公共类PdfPCellEvent     实现IPdfPCellEvent

Public Sub CellLayout(cell As iTextSharp.text.pdf.PdfPCell, position As iTextSharp.text.Rectangle, canvases() As iTextSharp.text.pdf.PdfContentByte) Implements iTextSharp.text.pdf.IPdfPCellEve`enter code here`nt.CellLayout
    Dim cb As PdfContentByte = canvases(PdfPTable.LINECANVAS)
   cb.RoundRectangle(position.Left,position.Bottom,position.Width,position.Height,10)
    cb.SetLineWidth(1)
    cb.SetCMYKColorStrokeF(0.0F, 0.0F, 0.0F, 1.0F)
    cb.Stroke()
End Sub

结束班级