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LogicalViewRectangle Property
See Also  Example
Leadtools.WinForms Namespace > RasterImageViewer Class : LogicalViewRectangle Property



Gets the logical view rectangle.

Syntax

Visual Basic (Declaration) 
<DesignerSerializationVisibilityAttribute()>
<BrowsableAttribute(False)>
Public Overridable ReadOnly Property LogicalViewRectangle As RectangleF
Visual Basic (Usage)Copy Code
Dim instance As RasterImageViewer
Dim value As RectangleF
 
value = instance.LogicalViewRectangle
C# 
[DesignerSerializationVisibilityAttribute()]
[BrowsableAttribute(false)]
public virtual RectangleF LogicalViewRectangle {get;}
C++/CLI 
[DesignerSerializationVisibilityAttribute()]
[BrowsableAttribute(false)]
public:
virtual property RectangleF LogicalViewRectangle {
   RectangleF get();
}

Return Value

The logical view rectangle.

Example

This example displays the information about the image and the RasterImageViewer settings.

Visual BasicCopy Code
Private Sub viewer_BorderPadding(ByVal sender As Object, ByVal e As EventArgs)
    Dim viewer As RasterImageViewer = CType(IIf(TypeOf sender Is RasterImageViewer, sender, Nothing), RasterImageViewer)
    MessageBox.Show(viewer.SizeMode.ToString())
End Sub
Public Sub RasterImageViewer_BorderPadding(ByVal viewer As RasterImageViewer)
    Dim b As ViewerBorderPadding = viewer.BorderPadding
    Dim s As String = String.Format("Border Padding: All {0} Left {1} Top {2} Right {3} Bottom {4}", b.All, b.Left, b.Top, b.Right, b.Bottom)
    Console.WriteLine(s)
    Console.WriteLine("Image Dpi: (" & viewer.ImageDpiX & ", " & viewer.ImageDpiY & ")")
    Console.WriteLine("Image Size: " & viewer.ImageSize.Width & ", " & viewer.ImageSize.Height)

    s = String.Format("LogicalViewRectangle {0}", viewer.LogicalViewRectangle)
    Console.WriteLine(s)
    s = String.Format("PhysicalViewRectangle {0}", viewer.PhysicalViewRectangle)
    Console.WriteLine(s)

End Sub
C#Copy Code
private void viewer_BorderPadding(object sender, EventArgs e) 

   RasterImageViewer viewer = sender as RasterImageViewer; 
   MessageBox.Show(viewer.SizeMode.ToString()); 

public void RasterImageViewer_BorderPadding(RasterImageViewer viewer) 

   ViewerBorderPadding b = viewer.BorderPadding; 
   string s = string.Format("Border Padding: All {0}  Left {1}  Top {2}  Right {3}  Bottom {4}", b.All, b.Left, b.Top, b.Right, b.Bottom); 
   Console.WriteLine(s); 
   Console.WriteLine("Image Dpi: (" + viewer.ImageDpiX + ", " + viewer.ImageDpiY + ")"); 
   Console.WriteLine("Image Size: " + viewer.ImageSize.Width + ", " + viewer.ImageSize.Height); 
 
   s = string.Format("LogicalViewRectangle {0}", viewer.LogicalViewRectangle); 
   Console.WriteLine(s); 
   s = string.Format("PhysicalViewRectangle {0}", viewer.PhysicalViewRectangle); 
   Console.WriteLine(s); 
 
}

Remarks

The logical view rectangle is the current viewing rectangle in image coordinates. The value of this property is the current pixel location (in top-left coordinates) of the left, top, right and bottom portion of the image being viewed on the screen.

In RasterPaintSizeMode.Fit, the value of LogicalViewRectangle is always (0, 0, image width in pixels, image height in pixels) since the entire image is always visible.

Since this property represents the values in image coordinates, if you change the HorizontalAlignMode or VerticalAlignMode mode to RasterPaintAlignMode.Center for example, the top and left values of the LogicalViewRectangle property will still be 0,0 since you are still viewing the entire image.

In other size modes, for example RasterPaintSizeMode.Normal, only portion of the image is viewed due to scrolling and zooming setting, the value of LogicalViewRectangle will be the rectangle formed by the left, top, right and bottom pixel "clip" values into the image.

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also