PdfViewer get the clicked position on the page

Product Version	Product	Author
2020.2.512.40	RadPdfViewer	Dimitar Karamfilov

Description

This article shows how you can get the position when the user clicks on a specific page. The position relates to the upper left corner of the page.

Solution

Use the following code to calculate the position:

public RadForm1()
{
    InitializeComponent();
    radPdfViewer1.MouseDown += RadPdfViewer1_MouseDown;
}

private void RadPdfViewer1_MouseDown(object sender, MouseEventArgs e)
{
    var element = radPdfViewer1.ElementTree.GetElementAtPoint(((MouseEventArgs)e).Location) as RadFixedPageElement;

    if (element != null)
    {

        var mouseLocation = ((MouseEventArgs)e).Location;
        var tt = element.TotalTransform;
        tt.Invert();

        var pointInDoc = tt.TransformPoint(mouseLocation);

        currentPageIndex = radPdfViewer1.Document.Pages.IndexOf(element.Page);
        var zoom = radPdfViewer1.PdfViewerElement.ScaleFactor;

        Console.WriteLine("PageNo: {0} X:{1} Y:{2}", currentPageIndex, pointInDoc.X / zoom, pointInDoc.Y / zoom);
    }
}

Public Sub New()
    InitializeComponent()
    AddHandler radPdfViewer1.MouseDown, AddressOf RadPdfViewer1_MouseDown
End Sub

Private Sub RadPdfViewer1_MouseDown(ByVal sender As Object, ByVal e As MouseEventArgs)
    Dim element = TryCast(radPdfViewer1.ElementTree.GetElementAtPoint(CType(e, MouseEventArgs).Location), RadFixedPageElement)

    If element IsNot Nothing Then

        Dim mouseLocation = CType(e, MouseEventArgs).Location
        Dim tt = element.TotalTransform
        tt.Invert()

        Dim pointInDoc = tt.TransformPoint(mouseLocation)

        currentPageIndex = radPdfViewer1.Document.Pages.IndexOf(element.Page)
        Dim zoom = radPdfViewer1.PdfViewerElement.ScaleFactor

        Console.WriteLine("PageNo: {0} X:{1} Y:{2}", currentPageIndex, pointInDoc.X / zoom, pointInDoc.Y / zoom)
    End If
End Sub