ZoomOnScroll Property

Summary
Gets or sets the value that indicates whether to allow the user to change the zoom of the spy glass. The zoom is adjusted by scrolling the mouse wheel up or down while spy glass is active.
Syntax
C#
C++/CLI
public bool ZoomOnScroll { get; set; } 
            public: 
property bool ZoomOnScroll { 
   bool get(); 
   void set (    bool ); 
} 

Property Value

true to allow the zoom to change using the mouse wheel, false to prevent the user from changing the zoom of the spy glass.

Remarks
  • This feature works if the user clicks and holds the mouse down to display the spy glass. As the user holds the mouse button down, scrolling the wheel to zoom up or down will zoom the image in and out.
  • To fine tune the zoom, the user can hold the shift button to zoom in or out in smaller increments.
Example
C#
using Leadtools; 
using Leadtools.Dicom; 
using Leadtools.Medical3D; 
using Leadtools.Codecs; 
using Leadtools.MedicalViewer; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Annotations.Engine; 
using Leadtools.Annotations.Designers; 
 
class MedicalViewerSpyGlassForm : Form 
{ 
   private MedicalViewer _medicalViewer; 
 
   void MedicalViewerLocalizer_SizeChanged(object sender, EventArgs e) 
   { 
      _medicalViewer.Size = new Size(this.ClientRectangle.Right, this.ClientRectangle.Bottom); 
   } 
 
   public MedicalViewerSpyGlassForm() 
   { 
      DicomEngine.Startup(); 
      RasterCodecs _codecs = new RasterCodecs(); 
 
      this.SizeChanged += new EventHandler(MedicalViewerLocalizer_SizeChanged); 
 
      // Create the medical viewer and adjust the size and the location. 
      _medicalViewer = new MedicalViewer(1, 2); 
      _medicalViewer.Location = new Point(0, 0); 
      _medicalViewer.Size = new Size(this.ClientRectangle.Right, this.ClientRectangle.Bottom); 
 
      // Load an image and then add it to the control. 
      RasterImage _image = _codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "xa.dcm")); 
      MedicalViewerMultiCell cell = new MedicalViewerMultiCell(_image, true, 1, 1); 
 
      cell.FitImageToCell = false; 
 
      // add some actions that will be used to change the properties of the images inside the control. 
      cell.AddAction(MedicalViewerActionType.Scale); 
      cell.AddAction(MedicalViewerActionType.Offset); 
      cell.AddAction(MedicalViewerActionType.SpyGlass); 
 
      // assign the added actions to a mouse button, meaning that when the user clicks and drags the mouse button, the associated action will be activated. 
      cell.SetAction(MedicalViewerActionType.Scale, MedicalViewerMouseButtons.Middle, MedicalViewerActionFlags.Active); 
      cell.SetAction(MedicalViewerActionType.Offset, MedicalViewerMouseButtons.Right, MedicalViewerActionFlags.Active); 
      cell.SetAction(MedicalViewerActionType.SpyGlass, MedicalViewerMouseButtons.Left, MedicalViewerActionFlags.Active); 
 
      cell.SpyGlassStarted += new EventHandler<MedicalViewerSpyGlassStartedEventArgs>(cell_SpyGlassStarted); 
 
      // adjust some spy glass properties. 
      cell.SpyGlass.PositionText = MedicalViewerSpyGlassTextType.Actual; 
      cell.SpyGlass.ZoomText = MedicalViewerSpyGlassTextType.Percentage; 
      cell.SpyGlass.ZoomOnScroll = true; 
 
      _medicalViewer.Cells.Add(cell); 
      // adjust some properties of the cell and add some tags. 
      _medicalViewer.Cells[0].SetTag(2, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.UserData, "EX. ID 230-36-5448"); 
      _medicalViewer.Cells[0].SetTag(4, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.Frame); 
      _medicalViewer.Cells[0].SetTag(6, MedicalViewerTagAlignment.TopLeft, MedicalViewerTagType.Scale); 
      _medicalViewer.Cells[0].SetTag(2, MedicalViewerTagAlignment.BottomLeft, MedicalViewerTagType.WindowLevelData); 
      _medicalViewer.Cells[0].SetTag(1, MedicalViewerTagAlignment.BottomLeft, MedicalViewerTagType.FieldOfView); 
 
      cell.ScaleType = MedicalViewerScaleType.Dynamic; 
 
      Controls.Add(_medicalViewer); 
      _medicalViewer.Dock = DockStyle.Fill; 
      DicomEngine.Shutdown(); 
   } 
 
   void cell_SpyGlassStarted(object sender, MedicalViewerSpyGlassStartedEventArgs e) 
   { 
      if (e.Image != null) 
      { 
         Leadtools.ImageProcessing.Color.InvertCommand invert = new Leadtools.ImageProcessing.Color.InvertCommand(); 
         invert.Run(e.Image); 
      } 
   } 
 
   void MedicalViewerLocalizer_FormClosing(object sender, FormClosingEventArgs e) 
   { 
   } 
 
 
   public MedicalViewer Viewer 
   { 
      get { return _medicalViewer; } 
   } 
} 
 
MedicalViewerSpyGlassForm GetMedicalViewerSpyGlassForm() 
{ 
   MessageBox.Show("Hold down Left click to show the spy glass, \n move the mouse while you hold the mouse button down to move the spy glass. \n scroll while holding the mouse down to zoom in or out"); 
   return new MedicalViewerSpyGlassForm(); 
} 
 
// This example changes the default window level value by decrease the width by 100. Then resets the images based on the new value. 
public void MedicalViewerSpyGlassExample() 
{ 
   MedicalViewerSpyGlassForm myForm = GetMedicalViewerSpyGlassForm(); 
   MedicalViewer medicalViewer = myForm.Viewer; 
 
   myForm.ShowDialog(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
} 
Requirements

Target Platforms

Help Version 23.0.2024.2.29
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Leadtools.MedicalViewer Assembly

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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.