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RasterViewerInteractiveMode Enumeration

Summary

Values for the RasterImageViewer.InteractiveMode property.

Syntax

C++

public enum RasterViewerInteractiveMode : System.Enum, System.IComparable, System.IConvertible, System.IFormattable

Public Enum RasterViewerInteractiveMode  
   Inherits System.Enum 
   Implements System.IComparable, System.IConvertible, System.IFormattable

public enum class RasterViewerInteractiveMode : public System.Enum, System.IComparable, System.IConvertible, System.IFormattable

Members

Value	Member	Description
0	None	Default, no user interaction.
1	Pan	Allows the user to pan the image using the mouse.
2	CenterAt	Centers the image at the mouse coordinates for the last user click. This will call the RasterImageViewer.CenterAtPoint method.
3	ZoomTo	Zooms the image to the rectangle created by the user.
4	Region	Creates a region based on user interaction. The type of region created depends on the RasterImageViewer.InteractiveRegionType property.
5	MagnifyGlass	Starts the MagnifyGlass.
6	Floater	Starts moving the RasterImageViewer.FloaterImage.
7	Page	Allows the user to change the current page in the image using the mouse.
8	Scale	Allows the user to change the current scale factor of the image using the mouse.
9	UserRectangle	User-defined rectangle. You should subscribe to the RasterImageViewer.InteractiveUserRectangle event to add your custom code to handle the rectangle drawn.
10	ZoomAt	Zooms the image at the mouse coordinates for the last user click. This will call the RasterImageViewer.ZoomAtPoint method with scaleFactor set to RasterImageViewer.CenterZoomAtPointScaleFactor.

Remarks

The RasterImageViewer.InteractiveMode property controls user interaction with the control's display.

Example

This example will set the viewer interactive mode to "ZoomAt", it will also alternate the scale factor used with each click between 2 and 0.5. When you run this example, the first click on the viewer will zoom in the image around that point twice. When you click again, the viewer will zoom out the image around that point twice. Subsequent clicks will repeat these operations.

Imports Leadtools.WinForms 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Drawing 
 
Private Shared Sub RasterViewerInteractiveModeExample(ByVal viewer As RasterImageViewer) 
   ' Make sure the viewer size mode is normal 
   viewer.SizeMode = RasterPaintSizeMode.Normal 
   ' Set interactive mode to ZoomAt 
   viewer.InteractiveMode = RasterViewerInteractiveMode.ZoomAt 
 
   ' Set the center at scale factor to 1, so zoom in twice with each click 
   viewer.CenterZoomAtPointScaleFactor = 2.0 
 
   AddHandler viewer.InteractiveModeEnded, AddressOf viewer_InteractiveModeEnded 
End Sub 
 
Private Shared Sub viewer_InteractiveModeEnded(ByVal sender As Object, ByVal e As EventArgs) 
   ' Check if this is the Center At interactive mode 
   Dim viewer As RasterImageViewer = CType(sender, RasterImageViewer) 
   If viewer.InteractiveMode = RasterViewerInteractiveMode.ZoomAt Then 
      If viewer.CenterZoomAtPointScaleFactor = 2.0 Then 
         ' Switch the scale factor to 0.5, so next time we click, it will zoom out twice 
         viewer.CenterZoomAtPointScaleFactor = 0.5 
      Else 
         ' Back to 2, so we zoom in 
         viewer.CenterZoomAtPointScaleFactor = 2.0 
      End If 
   End If 
End Sub

using Leadtools.WinForms; 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Drawing; 
 
private static void RasterViewerInteractiveModeExample(RasterImageViewer viewer) 
{ 
   // Make sure the viewer size mode is normal 
   viewer.SizeMode = RasterPaintSizeMode.Normal; 
   // Set interactive mode to ZoomAt 
   viewer.InteractiveMode = RasterViewerInteractiveMode.ZoomAt; 
 
   // Set the center at scale factor to 1, so zoom in twice with each click 
   viewer.CenterZoomAtPointScaleFactor = 2.0; 
 
   viewer.InteractiveModeEnded += viewer_ZoomAtInteractiveModeEnded; 
} 
private static void viewer_ZoomAtInteractiveModeEnded(object sender, EventArgs e) 
{ 
   // Check if this is the Center At interactive mode 
   RasterImageViewer viewer = sender as RasterImageViewer; 
   if (viewer.InteractiveMode == RasterViewerInteractiveMode.ZoomAt) 
   { 
      if (viewer.CenterZoomAtPointScaleFactor == 2.0) 
      { 
         // Switch the scale factor to 0.5, so next time we click, it will zoom out twice 
         viewer.CenterZoomAtPointScaleFactor = 0.5; 
      } 
      else 
      { 
         // Back to 2, so we zoom in 
         viewer.CenterZoomAtPointScaleFactor = 2.0; 
      } 
   } 
}