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 void ImageViewer_Example() 
{ 
   // Create the form that holds the ImageViewer 
   new MyForm().ShowDialog(); 
} 
 
class MyForm : Form 
{ 
   public MyForm() 
   { 
      this.Size = new Size(800, 800); 
   } 
 
   // LEADTOOLS ImageViewer to be used with this example 
   private ImageViewer _imageViewer; 
   // Information label 
   private Label _label; 
 
   protected override void OnLoad(EventArgs e) 
   { 
      // Create a panel to the top 
      var panel = new Panel(); 
      panel.Dock = DockStyle.Top; 
      panel.BorderStyle = BorderStyle.FixedSingle; 
      this.Controls.Add(panel); 
 
      // Add an "Example" button to the panel 
      var button = new Button(); 
      button.Text = "&Example"; 
      button.Click += (sender, e1) => Example(); 
      panel.Controls.Add(button); 
 
      // Add a label to the panel 
      _label = new Label(); 
      _label.Top = button.Bottom; 
      _label.Width = 800; 
      _label.Text = "Example..."; 
      panel.Controls.Add(_label); 
 
      // Create the image viewer taking the rest of the form 
      _imageViewer = new ImageViewer(); 
      _imageViewer.Dock = DockStyle.Fill; 
      _imageViewer.BackColor = Color.Bisque; 
      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(); 
 
      // Load an image 
      using (var codecs = new RasterCodecs()) 
         _imageViewer.Image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "image1.cmp")); 
 
      base.OnLoad(e); 
   } 
 
   private void Example() 
   { 
      // Example code goes here 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms

Reference

ImageViewerCenterAtInteractiveMode Members

Leadtools.Controls Namespace

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Help Version 22.0.2023.1.24

Leadtools.Controls Assembly

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