ImageViewerCenterAtInteractiveMode Class

Summary

Centers (and optionally zooms) the image inside the viewer based on user mouse click or touch tap.

Syntax

Objective-C

C++/CLI

public class ImageViewerCenterAtInteractiveMode : ImageViewerInteractiveMode

@interface LTImageViewerCenterAtInteractiveMode : LTImageViewerInteractiveMode<NSCoding>

public ref class ImageViewerCenterAtInteractiveMode : ImageViewerInteractiveMode

Remarks

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

This interactive mode uses ImageViewer.CenterAtPoint to center the image inside the viewer based on the tap event. Additionally, if the value of ScaleFactor is anything other than the default value of 1, then this mode will zoom in (if the value is greater than 1) or zoom out (if the value is less than 0) the image as well around the same center point.

When responding to a tap event, this mode will set InteractiveEventArgs.IsHandled to true.

For more information, refer to Image Viewer Interactive Modes.

Example

using Leadtools; 
using Leadtools.Controls; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
 
 
public ImageViewer _imageViewer; 
 
public void ImageViewerExample() 
{ 
   // Create the image viewer 
   _imageViewer = new ImageViewer(); 
   _imageViewer.Dock = DockStyle.Fill; 
   _imageViewer.BackColor = SystemColors.AppWorkspace; 
   this.Controls.Add(_imageViewer); 
   _imageViewer.BringToFront(); 
 
   // Add Pan/Zoom interactive mode 
   // Click and drag to pan, CTRL-Click and drag to zoom in and out 
   _imageViewer.DefaultInteractiveMode = new ImageViewerPanZoomInteractiveMode(); 
 
   // Get each ImageViewerInteractiveMode. This should only return PanZoom 
   foreach (var mode in _imageViewer.InteractiveModes) 
   { 
      Debug.WriteLine(mode); 
   } 
 
   var intertiaOptions = ControlInertiaScrollOptions.CreateDefault(); 
   intertiaOptions.IsEnabled = true; 
 
   // Load an image 
   using (var codecs = new RasterCodecs()) 
      _imageViewer.Image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "image1.cmp")); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

Requirements

Target Platforms

Reference

ImageViewerCenterAtInteractiveMode Members

Leadtools.Controls Namespace

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Help Version 23.0.2024.2.29

Leadtools.Controls Assembly

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Leadtools.Controls Namespace

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