ImageViewerZoomAtInteractiveMode Class

Summary

Zooms the image inside the viewer around the user mouse click or touch tap.

Syntax

C++/CLI

public class ImageViewerZoomAtInteractiveMode : ImageViewerInteractiveMode

public ref class ImageViewerZoomAtInteractiveMode : ImageViewerInteractiveMode

Remarks

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

When a valid Tap event occurs and InteractiveEventArgs.IsHandled is false, this interactive mode will start working and set InteractiveEventArgs.IsHandled to true.

This interactive mode uses ImageViewer.Zoom to zoom the image inside the viewer based on the tap event. If the value of ScaleFactor is greater than 1, then the viewer will zoom the image in. If the value of ScaleFactor is less than 1, then the viewer will zoom the image out.

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

ImageViewerZoomAtInteractiveMode Members

Leadtools.Controls Namespace

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Help Version 22.0.2023.1.24

Leadtools.Controls Assembly

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Getting Started

Namespaces

Leadtools.Controls Namespace

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