PointToImageCoordinates Method (ImageViewer)

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

public virtual Point PointToImageCoordinates( 
   Point point
)

'Declaration
 
Public Overridable Function PointToImageCoordinates( _
   ByVal point As Point _
) As Point

'Usage
 
Dim instance As ImageViewer
Dim point As Point
Dim value As Point
 
value = instance.PointToImageCoordinates(point)

public virtual Point PointToImageCoordinates( 
   Point point
)

 function Leadtools.Windows.Controls.ImageViewer.PointToImageCoordinates( 
   point 
)

public:
virtual Point PointToImageCoordinates( 
   Point point
)

Parameters

point: The source point in control (display) coordinates.

Return Value

A System.Windows.Point that contains the converted values in image coordinates.

The viewer control contain many properties that control how the image will be displayed on the surface of the control. At any time, you might require to convert a point or a rectangle from control (where it is on the surface of the control) to image (the pixel x and y value in the image data) and vice versa.

Use PointToImageCoordinates to convert a point from control to image coordinates, use PointFromImageCoordinates to convert a point from image to control coordinates. Use BoundsToImageCoordinates to convert a rectangle value from control to image coordinates and BoundsFromImageCoordinates to convert a rectangle value from image to control coordinates.

Note that when using the RasterImageBox and RasterImageViewer controls to display a LEADTOOLS Leadtools.RasterImage object, the image coordinates are assumed to be in top-left view perspective. If the image contains a RasterImage.ViewPerspective value other than RasterViewPerspective.TopLeft you must call RasterImage.PointToImage or RasterImage.RectangleToImage to further convert the values to actual rows and columns pixel values in the image.

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Private Class PointToImageCoordinatesWindow : Inherits Window
         Private theImage As ImageViewer
         Public Sub New()
             ' Create the  viewer
             theImage = New ImageViewer()

             ' Create Dock Panel

             Dim panel As DockPanel = New DockPanel()
             Content = panel

             DockPanel.SetDock(theImage, Dock.Bottom)

             theImage.HorizontalAlignment = HorizontalAlignment.Center
             theImage.VerticalAlignment = VerticalAlignment.Bottom

             panel.Children.Add(theImage)

             ' load an image into the viewer
             theImage.Source = New BitmapImage(New Uri(Path.Combine(LEAD_VARS.ImagesDir, "cannon.jpg")))
             theImage.SizeMode = SizeMode.Fit

             Title = String.Format("Size mode = {0}, click to change", theImage.SizeMode)

             AddHandler theImage.MouseDown, AddressOf theImage_MouseClick
         End Sub

         Private Sub theImage_MouseClick(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
             Dim point As Point = theImage.PointToImageCoordinates(e.GetPosition(Me))

             Dim s As String = String.Format("Point accroding the image coordinates {0}", point.ToString())
             MessageBox.Show(s)
         End Sub
     End Class

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

class PointToImageCoordinatesWindow : Window
   {
      ImageViewer theImage;
      public PointToImageCoordinatesWindow()
      {
         // Create the  viewer
         theImage = new ImageViewer();

         // Create Dock Panel

         DockPanel panel = new DockPanel();
         Content = panel;

         DockPanel.SetDock(theImage, Dock.Bottom);

         theImage.HorizontalAlignment = HorizontalAlignment.Center;
         theImage.VerticalAlignment = VerticalAlignment.Bottom;

         panel.Children.Add(theImage);

         // load an image into the viewer
         theImage.Source = new BitmapImage(new Uri(Path.Combine(LEAD_VARS.ImagesDir, "cannon.jpg")));
         theImage.SizeMode = SizeMode.Fit;

         Title = string.Format("Size mode = {0}, click to change", theImage.SizeMode);

         theImage.MouseDown += new MouseButtonEventHandler(theImage_MouseClick);
      }

      void theImage_MouseClick(object sender, MouseButtonEventArgs e)
      {
         Point point = theImage.PointToImageCoordinates(e.GetPosition(this));

         string s = string.Format("Point accroding the image coordinates {0}", point.ToString());
         MessageBox.Show(s);
      }
   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

class PointToImageCoordinatesWindow : ChildWindow
{
   ImageViewer theImage;
   public PointToImageCoordinatesWindow()
   {
      // Create the  viewer
      theImage = new ImageViewer();

      // Create Dock Panel

      StackPanel panel = new StackPanel();
      Content = panel;

      theImage.HorizontalAlignment = HorizontalAlignment.Center;
      theImage.VerticalAlignment = VerticalAlignment.Bottom;

      panel.Children.Add(theImage);

      // load an image into the viewer
      theImage.Source = new BitmapImage(new Uri(LeadtoolsExamples.Common.ImagesPath.Path + "cannon.jpg"));
      theImage.SizeMode = SizeMode.Fit;

      Title = string.Format("Size mode = {0}, click to change", theImage.SizeMode);

      theImage.MouseLeftButtonDown += new MouseButtonEventHandler(theImage_MouseLeftButtonDown);
   }

   void theImage_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
   {
      Point point = theImage.PointToImageCoordinates(e.GetPosition(this));

      string s = string.Format("Point accroding the image coordinates {0}", point.ToString());
      MessageBox.Show(s);
   }
}

Private Class PointToImageCoordinatesWindow : Inherits ChildWindow
   Private theImage As ImageViewer
   Public Sub New()
      ' Create the  viewer
      theImage = New ImageViewer()

      ' Create Dock Panel

      Dim panel As StackPanel = New StackPanel()
      Content = panel

      theImage.HorizontalAlignment = HorizontalAlignment.Center
      theImage.VerticalAlignment = VerticalAlignment.Bottom

      panel.Children.Add(theImage)

      ' load an image into the viewer
      theImage.Source = New BitmapImage(New Uri(LeadtoolsExamples.Common.ImagesPath.Path & "cannon.jpg"))
      theImage.SizeMode = SizeMode.Fit

      Title = String.Format("Size mode = {0}, click to change", theImage.SizeMode)

      AddHandler theImage.MouseLeftButtonDown, AddressOf theImage_MouseLeftButtonDown
   End Sub

   Private Sub theImage_MouseLeftButtonDown(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
      Dim point As Point = theImage.PointToImageCoordinates(e.GetPosition(Me))

      Dim s As String = String.Format("Point accroding the image coordinates {0}", point.ToString())
      MessageBox.Show(s)
   End Sub
End Class

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

ImageViewer Class
ImageViewer Members