ImageViewerSpyGlassInteractiveMode Class

Summary

Draws and pans a spy glass on the viewer.

Syntax

Objective-C

C++/CLI

public class ImageViewerSpyGlassInteractiveMode : ImageViewerInteractiveMode

@interface LTImageViewerSpyGlassInteractiveMode : LTImageViewerInteractiveMode

public ref class ImageViewerSpyGlassInteractiveMode : ImageViewerInteractiveMode

Remarks

ImageViewerSpyGlassInteractiveMode derives from ImageViewerInteractiveMode and subscribes to the following events of the InteractiveService:

The mode will set InteractiveEventArgs.IsHandled to true under the normal conditions for these events.

The ImageViewerSpyGlassInteractiveMode interactive mode does not perform any action on the viewer (besides drawing the the spy glass). It is up to the user to implement any custom operation required, (for example, to implement a magnify glass). The ImageViewerMagnifyGlassInteractiveMode derives from the ImageViewerSpyGlassInteractiveMode and overrides the OnDrawImage method to draw a magnified version of the area under the spy glass.

The ImageViewerSpyGlassInteractiveMode also supports redirecting the output to an external control instead of the viewer surface. For an example, refer to RedirectControl.

For more information, refer to Image Viewer Interactive Modes.

Example

This example will use ImageViewerSpyGlassInteractiveMode to show an inverted portion of the image under the mouse.

Start with the ImageViewer example, remove all the code inside the example function (search for the "// TODO: add example code here" comment) and insert the following code:

using Leadtools; 
using Leadtools.Controls; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
 
public ImageViewerForm _form = new ImageViewerForm(); 
public ImageViewer _imageViewer; 
 
public void ImageViewerSpyGlassInteractiveModeExample() 
{ 
   // Get the ImageViewer control from the form 
   _imageViewer = _form.ImageViewer; 
 
   // Load an image 
   using (var codecs = new RasterCodecs()) 
      _imageViewer.Image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "image1.cmp")); 
 
   // Create the spyglass interactive mode 
   ImageViewerSpyGlassInteractiveMode spyGlass = new ImageViewerSpyGlassInteractiveMode(); 
   spyGlass.AutoItemMode = ImageViewerAutoItemMode.AutoSet; 
   spyGlass.BackgroundBrush = new SolidBrush(Color.FromArgb(128, Color.Yellow)); 
   spyGlass.BorderBackPen = new Pen(Color.Red); 
   spyGlass.BorderPen = new Pen(Color.Blue) { DashPattern = new float[] { 4.0F, 2.0F, 1.0F, 3.0F }}; 
   spyGlass.Crosshair = ImageViewerSpyGlassCrosshair.Fine; 
   spyGlass.CrosshairPen = new Pen(Color.Green); 
   spyGlass.EnsureVisible = false; 
   spyGlass.Offset = new LeadPoint(0, 0); 
   spyGlass.HideCursorWhileWorking = true; 
   spyGlass.IdleCursor = Cursors.Cross; 
   spyGlass.RoundRectangleRadius = new LeadSize(25, 25); 
   spyGlass.Shape = ImageViewerSpyGlassShape.RoundRectangle; 
   spyGlass.Size = new LeadSize(200, 200); 
 
   // Get inverted copy of the RasterImage in the Viewer control 
   RasterImage invertedRasterImage = _imageViewer.Image.Clone(); 
   InvertCommand invertCommand = new InvertCommand(); 
   invertCommand.Run(invertedRasterImage); 
 
   // Overlay the inverted image on the spy glass 
   spyGlass.DrawImage += (object sender, ImageViewerSpyGlassDrawImageEventArgs e) => 
   { 
      Image img = RasterImageConverter.ChangeToImage(invertedRasterImage, new ChangeToImageOptions()); 
      e.Context.DrawImage(img, Point.Empty); 
      _form.Text = 
      $"Destination Rectangle: (" + 
      $"{e.DestinationRectangle.X}, {e.DestinationRectangle.Y}, {e.DestinationRectangle.Width}, {e.DestinationRectangle.Height}), " + 
      $"Offset: {e.Offset.X}, {e.Offset.Y}"; 
   }; 
 
   // Add spyglass interactive mode 
   _imageViewer.InteractiveModes.BeginUpdate(); 
   _imageViewer.InteractiveModes.Add(spyGlass); 
   _imageViewer.InteractiveModes.EndUpdate(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

Requirements

Target Platforms

Reference

ImageViewerSpyGlassInteractiveMode Members

Leadtools.Controls Namespace

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Help Version 23.0.2024.2.29

Leadtools.Controls Assembly

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