3.3 Tiling Pattern Resource

The DefineTilingPatternResource method defines background pattern resource for the example area. The pattern is the word “PdfFileWriter” in white over light blue background. The pattern is made of two lines of repeating the key word. The two lines are skewed by half word length.

If you want to find interesting patterns, search the internet for catalogs of companies making floor or wall tiles.

// Define Tiling Pattern Resource
private void DefineTilingPatternResource()
{
    // create empty tiling pattern
    WaterMark = new PdfTilingPattern(Document);

    // the pattern will be PdfFileWriter laied out in brick pattern
    string Mark = "PdfFileWriter";

    // text width and height for Arial bold size 18 points
    double FontSize = 18.0;
    double TextWidth = ArialBold.TextWidth(FontSize, Mark);
    double TextHeight = ArialBold.LineSpacing(FontSize);

    // text base line
    double BaseLine = ArialBold.DescentPlusLeading(FontSize);

    // the overall pattern box (we add text height value as left and right text margin)
    double BoxWidth = TextWidth + 2 * TextHeight;
    double BoxHeight = 4 * TextHeight;
    WaterMark.SetTileBox(BoxWidth, BoxHeight);

    // save graphics state
    WaterMark.SaveGraphicsState();

    // fill the pattern box with background light blue color
    WaterMark.SetColorNonStroking(Color.FromArgb(230, 244, 255));
    WaterMark.DrawRectangle(0, 0, BoxWidth, BoxHeight, PaintOp.Fill);

    // set fill color for water mark text to white
    WaterMark.SetColorNonStroking(Color.White);

    // draw PdfFileWriter at the bottom center of the box
    WaterMark.DrawText(ArialBold, FontSize, BoxWidth / 2, BaseLine, TextJustify.Center, Mark);

    // adjust base line upward by half height
    BaseLine += BoxHeight / 2;

    // draw the right half of PdfFileWriter shifted left by half width
    WaterMark.DrawText(ArialBold, FontSize, 0.0, BaseLine, TextJustify.Center, Mark);

    // draw the left half of PdfFileWriter shifted right by half width
    WaterMark.DrawText(ArialBold, FontSize, BoxWidth, BaseLine, TextJustify.Center, Mark);

    // restore graphics state
    WaterMark.RestoreGraphicsState();
    return;
}