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InteractiveScale Event

Summary

Occurs when the user performs interactive change of the current scale factor using the mouse.

Syntax

C++

public event EventHandler<RasterViewerLineEventArgs> InteractiveScale

  
Public Event InteractiveScale As EventHandler(Of RasterViewerLineEventArgs)

public: 
event EventHandler<RasterViewerLineEventArgs^>^ InteractiveScale

Event Data

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

Property	Description
Begin	Returns the beginning point for the current interactive mode line.
Cancel (Inherited from Leadtools.WinForms.RasterViewerInteractiveEventArgs)	Gets or sets a value indicating whether the interactive mode should be canceled.
End	Returns the end point for the current interactive mode line.
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.Scale.

Example

This sample lets you drag the mouse to scale an image. Also, it displays the contents of the InteractiveScale event in the console

using Leadtools.WinForms; 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Drawing; 
 
private void viewer_InteractiveScale(object sender, RasterViewerLineEventArgs e) 
{ 
   RasterImageViewer viewer = sender as RasterImageViewer; 
   if (e.Status == RasterViewerInteractiveStatus.Begin) 
      viewer.Cursor = Cursors.SizeAll; 
   else if (e.Status == RasterViewerInteractiveStatus.End) 
      viewer.Cursor = Cursors.Default; 
   Console.WriteLine("InteractiveScale: e.Begin {0}, e.End{1}, e.Status {2}, e.Cancel {3}", e.Begin, e.End, e.Status, e.Cancel); 
} 
 
public void RasterImageViewer_InteractiveScale(RasterImageViewer viewer) 
{ 
   viewer.InteractiveMode = RasterViewerInteractiveMode.Scale; 
   viewer.InteractiveScale += new EventHandler<RasterViewerLineEventArgs>(viewer_InteractiveScale); 
 
   // Drag mouse across image to scale the image 
   // After you are done, you must remove the event handler as in below 
   // 
   // viewer.InteractiveScale -= new EventHandler<RasterViewerLineEventArgs>(viewer_InteractiveScale); 
}

Imports Leadtools.WinForms 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Drawing 
 
Private Sub viewer_InteractiveScale(ByVal sender As Object, ByVal e As RasterViewerLineEventArgs) 
   Dim viewer As RasterImageViewer = CType(IIf(TypeOf sender Is RasterImageViewer, sender, Nothing), RasterImageViewer) 
   If e.Status = RasterViewerInteractiveStatus.Begin Then 
      viewer.Cursor = Cursors.SizeAll 
   ElseIf e.Status = RasterViewerInteractiveStatus.End Then 
      viewer.Cursor = Cursors.Default 
   End If 
   Console.WriteLine("InteractiveScale: e.Begin {0}, e.End{1}, e.Status {2}, e.Cancel {3}", e.Begin, e.End, e.Status, e.Cancel) 
End Sub 
 
Public Sub RasterImageViewer_InteractiveScale(ByVal viewer As RasterImageViewer) 
   viewer.InteractiveMode = RasterViewerInteractiveMode.Scale 
   AddHandler viewer.InteractiveScale, AddressOf viewer_InteractiveScale 
 
   ' Drag mouse across image to scale the image 
   ' After you are done, you must remove the event handler as in below 
   ' 
   ' viewer.InteractiveScale -= new EventHandler<RasterViewerLineEventArgs>(viewer_InteractiveScale); 
End Sub

Requirements

Target Platforms

Reference

RasterImageViewer Class

RasterImageViewer Members

Help Version 19.0.2017.10.27