How do I draw a table using ElementBuilder & ElementWriter?

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Oct 12, 2006, 8:46:07 PM10/12/06
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Q: How do I draw a table using ElementBuilder & ElementWriter?

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A:
The following sample code illustrates how to draw a table using
PDFNet's low-level PDF creation API.

Please notice that this function is not a general purpose API to draw a
table, but is more of an illustration that can be used as a starting
point to implement more complex PDF drawing functions.

static void DrawTable(Table t, double originx, double originy, PDFDoc
doc, ElementWriter writer, ElementBuilder eb)
{
// Draw the table background ---------------------
Element element = eb.CreateRect(originx, originy, t.Width.Value,
t.Height.Value);

// Set the path color space and color
element.SetPathFill(true); // this path is should be filled
element.SetPathClip(false);
GState gstate = element.GetGState();
gstate.SetFillColorSpace(ColorSpace.CreateDeviceRGB());
gstate.SetFillColor(new ColorPt(0.8, 0.8, 0.8)); // components are in
the range [0..1]
element.SetPathStroke(false); // this path is should be stroked
writer.WriteElement(element);

// Draw the table grid ----------------------------
TableRowCollection rows = t.Rows;

if (rows.Count<1) return;
double cell_height = t.Height.Value / rows.Count;
double cell_width = t.Width.Value / t.Rows[0].Cells.Count;

Font font = Font.Create(doc, Font.StandardType1Font.e_times_roman);

double row_xpos = originx, row_ypos = originy;
foreach (TableRow row in rows)
{
foreach (TableCell c in row.Cells)
{
writer.WriteElement(eb.CreateGroupBegin());

// Draw the cell rectangle
element = eb.CreateRect(row_xpos, row_ypos, cell_width,
cell_height);
element.SetPathFill(false); // this path is should be filled
element.SetPathStroke(true); // this path is should be stroked
element.SetPathClip(true); // use the rectangle as a clipping
path
gstate = element.GetGState();
gstate.SetStrokeColorSpace(ColorSpace.CreateDeviceRGB());
gstate.SetStrokeColor(new ColorPt(0, 0, 0)); // components are in
the range [0..1]
writer.WriteElement(element);

// Fill the cell with the content -----------------
// Begin writing a block of text
double font_size = 20;
element = eb.CreateTextBegin(Font.Create(doc,
Font.StandardType1Font.e_times_roman), font_size);
writer.WriteElement(element);

gstate = element.GetGState();
gstate.SetFillColor(new ColorPt(1, 0, 0));

element = eb.CreateTextRun(c.Text);
element.SetTextMatrix(1, 0, 0, 1, row_xpos +
(cell_width-element.GetTextLength())/2, row_ypos +
(cell_height-font_size)/2);
writer.WriteElement(element);

// Finish the block of text
writer.WriteElement(eb.CreateTextEnd());

row_xpos += cell_width;
writer.WriteElement(eb.CreateGroupEnd());
}

row_xpos = originx;
row_ypos += cell_height;
}
}

/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main(string[] args)
{
PDFNet.Initialize();
PDFNet.SetResourcesPath("../../../../../resources");

// Relative path to the folder containing test files.
string input_path = "../../../../TestFiles/";
string output_path = "../../../../TestFiles/Output/";


try
{
Console.WriteLine("-------------------------------------------------");

PDFDoc doc = new PDFDoc();

ElementBuilder builder = new ElementBuilder(); // ElementBuilder is
used to build new Element objects
ElementWriter writer = new ElementWriter(); // ElementWriter is used
to write Elements to the page

Page page = doc.PageCreate(new Rect(0, 0, 612, 794));
writer.Begin(page); // begin writing to this page

// Dynamically create a new table.
Table t = new Table();
t.Width = 590;
t.Height = 775;

// Generate rows and cells.
int numrows = 10;
int numcells = 5;
for (int j=0; j<numrows; j++)
{
TableRow r = new TableRow();
for (int i=0; i<numcells; i++)
{
TableCell c = new TableCell();
c.Text = "(" + i + "," + j + ")";
r.Cells.Add(c);
}
t.Rows.Add(r);
}

DrawTable(t, 10, 10, doc, writer, builder);

writer.End();
doc.PagePushBack(page);

doc.Save(output_path + "output.pdf",
Doc.SaveOptions.e_remove_unused);
doc.Close();
Console.WriteLine("Done.");
}
catch (PDFNetException e)
{
Console.WriteLine(e.Message);
}

PDFNet.Terminate();
}

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