ZoomAtPoint Method

C#
Visual Basic
Objective-C
Java
C++

public virtual void ZoomAtPoint( 
   Point pt,
   double scaleFactor
)

'Declaration
 
Public Overridable Sub ZoomAtPoint( _
   ByVal pt As Point, _
   ByVal scaleFactor As Double _
)

'Usage
 
Dim instance As RasterImageViewer
Dim pt As Point
Dim scaleFactor As Double
 
instance.ZoomAtPoint(pt, scaleFactor)

public:
virtual void ZoomAtPoint( 
   Point pt,
   double scaleFactor
)

Parameters

pt: The point at which to zoom the image display, in client coordinates.
scaleFactor: Scale factor to use. A value greater than 1 will zoom in the image and a value less than 1 will zoom out the image. Must be a value greater than 0.

If the value of scaleFactor was anything other than the default value of 1, then this method will zooms in (if the value is greater than 1) or zooms out (if the value is less than 0) the image as well around the point specified by pt.

This example shows to zoom the viewer around the point when the user clicks on the image.

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools.WinForms
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Drawing

Private Shared Sub ZoomAtPointExample(ByVal viewer As RasterImageViewer)
   ' Subscribe to the viewer click event
   AddHandler viewer.MouseClick, AddressOf viewer_MouseClick
End Sub
Private Shared Sub viewer_MouseClick(ByVal sender As Object, ByVal e As MouseEventArgs)
   ' Zoom in twice around the mouse coordinates
   Dim viewer As RasterImageViewer = CType(sender, RasterImageViewer)
   viewer.ZoomAtPoint(New Point(e.X, e.Y), 2.0)
End Sub

using Leadtools.WinForms;
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Color;
using Leadtools.Drawing;

private static void ZoomAtPointExample(RasterImageViewer viewer)
{
   // Subscribe to the viewer click event
   viewer.MouseClick += viewer_MouseClick;
}
private static void viewer_MouseClick(object sender, MouseEventArgs e)
{
   // Zoom in twice around the mouse coordinates
   RasterImageViewer viewer = sender as RasterImageViewer;
   viewer.ZoomAtPoint(new Point(e.X, e.Y), 2.0);
}

Target Platforms

Reference

RasterImageViewer Class
RasterImageViewer Members