PdfGraphics.AddToPageBackground(PdfPage, Single, Single) Method

Adds graphics to a PDF page background with the specified horizontal and vertical resolutions.

Namespace: DevExpress.Pdf

Assembly: DevExpress.Pdf.v19.1.Drawing.dll

Declaration

C#

public void AddToPageBackground(
    PdfPage page,
    float dpiX,
    float dpiY
)

VB.NET

Public Sub AddToPageBackground(
    page As PdfPage,
    dpiX As Single,
    dpiY As Single
)

Parameters

Name	Type	Description
page	PdfPage	A PdfPage object that is the page where graphics are drawn (measured in points - 1/72 of an inch).
dpiX	Single	A Single object that represents the value, in dots per inch, for the horizontal resolution.
dpiY	Single	A Single object that represents the value, in dots per inch, for the vertical resolution.

Remarks

Call the AddToPageBackground method to draw graphics as the background of the page. To draw graphics as the foreground of the page content, call the PdfGraphics.AddToPageForeground method.

The overloaded AddToPageBackground method automatically converts world coordinates to page coordinates. See Coordinate Systems to learn more.

The world coordinates (units) are converted to page coordinates (points) using the following formula:

x = (unitX / dpiX) * 72;

y = cropBoxHeight - (unitY / dpiY) * 72.

To render graphics on a PDF document page, pass 72 as a DPI value to this method. The DPI value you pass into this method does not affect graphics quality and used for coordinates transformation only (world coordinates to page coordinates). For example, 72 DPI value allows transforming coordinates without any scaling.