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PointToImageCoordinates Method (ImageViewer)

Summary

Converts a point from control (display) to image coordinates.

Syntax

C++

public virtual Point PointToImageCoordinates(  
   Point point 
)

Public Overridable Function PointToImageCoordinates( _ 
   ByVal point As Point _ 
) As 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.

Remarks

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.

Example

Silverlight C#

Silverlight VB

Imports Leadtools.Windows.Controls 
 
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

using Leadtools.Help; 
using Leadtools.Windows.Controls; 
 
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"; 
}

using Leadtools.Help; 
using Leadtools.Windows.Controls; 
 
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); 
   } 
}

Imports Leadtools 
Imports Leadtools.Windows.Controls 
 
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