ConvertPoint(ImageViewerItem,ImageViewerCoordinateType,ImageViewerCoordinateType,LeadPointD) Method

Summary

Converts a LeadPointD from one coordinates to the other.

Syntax

C++

public virtual LeadPointD ConvertPoint( 
   ImageViewerItem item, 
   ImageViewerCoordinateType fromType, 
   ImageViewerCoordinateType toType, 
   LeadPointD point 
)

Public Overridable Function ConvertPoint( 
   ByVal item As ImageViewerItem, 
   ByVal fromType As ImageViewerCoordinateType, 
   ByVal toType As ImageViewerCoordinateType, 
   ByVal point As LeadPointD 
) As LeadPointD

public:  
   virtual LeadPointD^ ConvertPoint( 
      ImageViewerItem^ item, 
      ImageViewerCoordinateType^ fromType, 
      ImageViewerCoordinateType^ toType, 
      LeadPointD^ point 
   )

Parameters

item

The reference item. This value can be null.

fromType

Original coordinates of point.

toType

Desired target coordinates.

point

The point to convert.

Return Value

The converted point

Remarks

For information on the various conversion types, refer to ConvertPoints.

For more information refer to Image Viewer Layouts, Image Viewer Appearance, Image Viewer Items, Image Viewer Transformation, and Image Viewer Bounds and Transform.

Example

using Leadtools; 
using Leadtools.Controls; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
using LeadtoolsExamples.Common; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
 
public void ImageViewerItemTransform_Example(int dy, LeadPoint position) 
{ 
   double total = _imageViewer.GetItemViewBounds(_imageViewer.ActiveItem, ImageViewerItemPart.Item, false).Height; 
   double factor; 
 
   if (total > 0) 
      factor = 1.0 - (dy * 2.0) / total; 
   else 
      factor = 1.0; 
 
   // Get the origin in image coordinate 
   var origin = _imageViewer.ConvertPoint(_imageViewer.ActiveItem, ImageViewerCoordinateType.Control, ImageViewerCoordinateType.Image, position).ToLeadPointD(); 
   // Convert it to whatever the current transform is 
   origin = _imageViewer.ActiveItem.Transform.Transform(origin); 
 
   var transform = LeadMatrix.Identity; 
   transform.ScaleAt(1 / factor, 1 / factor, origin.X, origin.Y); 
   _imageViewer.ActiveItem.Transform = LeadMatrix.Multiply(_imageViewer.ActiveItem.Transform, transform); 
}

Imports Leadtools 
Imports Leadtools.Controls 
Imports Leadtools.Codecs 
Imports Leadtools.Drawing 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Color 
Imports LeadtoolsControlsExamples.LeadtoolsExamples.Common 
 
Public Sub ImageViewerTransform_Example(ByVal dy As Integer, ByVal position As LeadPoint) 
   Dim total As Double = _imageViewer.GetItemViewBounds(_imageViewer.ActiveItem, ImageViewerItemPart.Item, False).Height 
   Dim factor As Double 
 
   If total > 0 Then 
      factor = 1.0 - (dy * 2.0) / total 
   Else 
      factor = 1.0 
   End If 
 
   ' Get the origin in image coordinate 
   Dim origin As LeadPointD = _imageViewer.ConvertPoint(_imageViewer.ActiveItem, ImageViewerCoordinateType.Control, 
                                                        ImageViewerCoordinateType.Image, position).ToLeadPointD() 
   ' Convert it to whatever the current transform is 
   origin = _imageViewer.ActiveItem.Transform.Transform(origin) 
 
   Dim transform As LeadMatrix = LeadMatrix.Identity 
   transform.ScaleAt(1 / factor, 1 / factor, origin.X, origin.Y) 
   _imageViewer.ActiveItem.Transform = LeadMatrix.Multiply(_imageViewer.ActiveItem.Transform, transform) 
End Sub

Requirements

Target Platforms

Reference

ImageViewer Class

ImageViewer Members

Leadtools.Controls Namespace

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Help Version 20.0.2020.4.3