←Select platform

MagnifyGlass Property

Summary

Gets or sets the RasterMagnifyGlass object used to perform Magnifying Glass operations for this RasterImageViewer.

Syntax

C++

[BrowsableAttribute(false)] 
public virtual Leadtools.Winforms.RasterMagnifyGlass MagnifyGlass {get; set;}

<BrowsableAttribute(False)> 
Public Overridable Property MagnifyGlass As Leadtools.Winforms.RasterMagnifyGlass

[BrowsableAttribute(false)] 
public: 
virtual property Leadtools.Winforms.RasterMagnifyGlass^ MagnifyGlass { 
   Leadtools.Winforms.RasterMagnifyGlass^ get(); 
   void set (    Leadtools.Winforms.RasterMagnifyGlass^ ); 
}

Property Value

The RasterMagnifyGlass object used to perform Magnifying Glass operations for this RasterImageViewer.

Remarks

Use the AutoInteractiveMagnifyGlass property to control whether the magnifying glass only appears when the current interactive button is down.

You can derive your own class from RasterMagnifyGlass, and then set this property to an instance of that class to perform your own Magnifying Glass processing (for example, change the way the crosshair is displayed).

Example

This sample lets create your own custom magnify glass. The custom magnify glass is drawn with a red "X" for the crosshair The border is a blue rectangle.

Imports Leadtools.WinForms 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Drawing 
 
Private Class MyRasterMagnifyGlass : Inherits RasterMagnifyGlass 
   Public Sub New() 
      Shape = RasterMagnifyGlassShape.Border3D 
   End Sub 
   Protected Overrides Sub OnPaintBorder(ByVal graphics As Graphics, ByVal centerPoint As Point) 
      Dim width As Integer = (Size.Width - 2) \ 2 
      Dim height As Integer = (Size.Height - 2) \ 2 
 
      Dim rc As Rectangle = New Rectangle(centerPoint.X - width, centerPoint.Y - height, 2 * width, 2 * height) 
      graphics.DrawRectangle(Pens.Blue, rc) 
   End Sub 
 
   Protected Overrides Sub OnPaintCrosshair(ByVal graphics As Graphics, ByVal centerPoint As Point) 
      Dim width As Integer = (Size.Width - 2) \ 2 
      Dim height As Integer = (Size.Height - 2) \ 2 
      Dim p1 As Point = New Point(centerPoint.X - width, centerPoint.Y - height) 
      Dim p2 As Point = New Point(centerPoint.X + width, centerPoint.Y + height) 
      graphics.DrawLine(Pens.Red, p1, p2) 
 
      p1 = New Point(centerPoint.X + width, centerPoint.Y - height) 
      p2 = New Point(centerPoint.X - width, centerPoint.Y + height) 
      graphics.DrawLine(Pens.Red, p1, p2) 
   End Sub 
End Class 
 
Private Sub viewer_MagnifyGlassChanged(ByVal sender As Object, ByVal e As EventArgs) 
   MessageBox.Show("Custom Magnify Glass being used -- red X for crosshair, blue for border") 
End Sub 
 
Public Sub RasterImageViewer_MagnifyGlass(ByVal viewer As RasterImageViewer) 
   AddHandler viewer.MagnifyGlassChanged, AddressOf viewer_MagnifyGlassChanged 
   viewer.MagnifyGlass = New MyRasterMagnifyGlass() 
   viewer.InteractiveMode = RasterViewerInteractiveMode.MagnifyGlass 
 
   RemoveHandler viewer.MagnifyGlassChanged, AddressOf viewer_MagnifyGlassChanged 
End Sub

using Leadtools.WinForms; 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Drawing; 
 
class MyRasterMagnifyGlass : RasterMagnifyGlass 
{ 
   public MyRasterMagnifyGlass() 
   { 
      Shape = RasterMagnifyGlassShape.Border3D; 
   } 
   protected override void OnPaintBorder(Graphics graphics, Point centerPoint) 
   { 
      int width = (Size.Width - 2) / 2; 
      int height = (Size.Height - 2) / 2; 
 
      Rectangle rc = new Rectangle(centerPoint.X - width, centerPoint.Y - height, 2*width, 2*height); 
      graphics.DrawRectangle(Pens.Blue, rc); 
   } 
 
   protected override void OnPaintCrosshair(Graphics graphics, Point centerPoint) 
   { 
      int width = (Size.Width - 2) / 2; 
      int height = (Size.Height - 2) / 2; 
      Point p1 = new Point(centerPoint.X - width, centerPoint.Y - height); 
      Point p2 = new Point(centerPoint.X + width, centerPoint.Y + height); 
      graphics.DrawLine(Pens.Red, p1, p2); 
 
      p1 = new Point(centerPoint.X + width, centerPoint.Y - height); 
      p2 = new Point(centerPoint.X - width, centerPoint.Y + height); 
      graphics.DrawLine(Pens.Red, p1, p2); 
   } 
} 
 
private void viewer_MagnifyGlassChanged(object sender, EventArgs e) 
{ 
   MessageBox.Show("Custom Magnify Glass being used -- red X for crosshair, blue for border"); 
} 
 
public void RasterImageViewer_MagnifyGlass(RasterImageViewer viewer) 
{ 
   viewer.MagnifyGlassChanged+= new EventHandler(viewer_MagnifyGlassChanged); 
   viewer.MagnifyGlass = new MyRasterMagnifyGlass(); 
   viewer.InteractiveMode = RasterViewerInteractiveMode.MagnifyGlass; 
 
   viewer.MagnifyGlassChanged -= new EventHandler(viewer_MagnifyGlassChanged); 
}