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InteractiveZoomTo Event

Summary

Occurs when the user performs interactive center of the image display.

Syntax

C++

public event EventHandler<RasterViewerRectangleEventArgs> InteractiveZoomTo

  
Public Event InteractiveZoomTo As EventHandler(Of RasterViewerRectangleEventArgs)

public: 
event EventHandler<RasterViewerRectangleEventArgs^>^ InteractiveZoomTo

Event Data

The event handler receives an argument of type RasterViewerRectangleEventArgs containing data related to this event. The following RasterViewerRectangleEventArgs properties provide information specific to this event.

Property	Description
Cancel (Inherited from Leadtools.WinForms.RasterViewerInteractiveEventArgs)	Gets or sets a value indicating whether the interactive mode should be canceled.
Rectangle	Returns the current interactive mode rectangle.
Status (Inherited from Leadtools.WinForms.RasterViewerInteractiveEventArgs)	Gets the current status of the interactive mode.

Remarks

Only occurs when the InteractiveMode property is set to RasterViewerInteractiveMode.ZoomTo.

Example

This sample zooms the image when dragging a rectangle on the image. Also, it displays the contents of the InteractiveZoomTo event in the console

using Leadtools.WinForms; 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Drawing; 
 
private void viewer_InteractiveZoomTo(object sender, RasterViewerRectangleEventArgs e) 
{ 
   Console.WriteLine("InteractiveZoomTo: e.Rectangle {0}, e.Status {1}, e.Cancel {2}", e.Rectangle, e.Status, e.Cancel); 
} 
 
public void RasterImageViewer_InteractiveZoomTo(RasterImageViewer viewer) 
{ 
   viewer.InteractiveMode = RasterViewerInteractiveMode.ZoomTo; 
   viewer.InteractiveZoomTo += new EventHandler<RasterViewerRectangleEventArgs>(viewer_InteractiveZoomTo); 
 
   MessageBox.Show("Draw a rectangle with the mouse to cause a zoom"); 
   // After you are done, you must remove the event handler as in below 
   // 
   // viewer.InteractiveZoomTo -= new EventHandler<RasterViewerRectangleEventArgs>(viewer_InteractiveZoomTo); 
}

Imports Leadtools.WinForms 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Drawing 
 
Private Sub viewer_InteractiveZoomTo(ByVal sender As Object, ByVal e As RasterViewerRectangleEventArgs) 
   Console.WriteLine("InteractiveZoomTo: e.Rectangle {0}, e.Status {1}, e.Cancel {2}", e.Rectangle, e.Status, e.Cancel) 
End Sub 
 
Public Sub RasterImageViewer_InteractiveZoomTo(ByVal viewer As RasterImageViewer) 
   viewer.InteractiveMode = RasterViewerInteractiveMode.ZoomTo 
   AddHandler viewer.InteractiveZoomTo, AddressOf viewer_InteractiveZoomTo 
 
   MessageBox.Show("Draw a rectangle with the mouse to cause a zoom") 
   ' After you are done, you must remove the event handler as in below 
   ' 
   ' viewer.InteractiveZoomTo -= new EventHandler<RasterViewerRectangleEventArgs>(viewer_InteractiveZoomTo); 
End Sub

Requirements

Target Platforms

Reference

RasterImageViewer Class

RasterImageViewer Members

Help Version 19.0.2017.10.27