Public Function ConvertLogicalToObjectPoints( _
   ByVal points() As AnnPoint _
) As AnnPoint()

Visual Basic (Usage)	Copy Code
Dim instance As AnnObject Dim points() As AnnPoint Dim value() As AnnPoint   value = instance.ConvertLogicalToObjectPoints(points)

public AnnPoint[] ConvertLogicalToObjectPoints( 
   AnnPoint[] points
)

public:
array<AnnPoint>^ ConvertLogicalToObjectPoints( 
   array<AnnPoint>^ points
) 

Parameters

points

An array points in logical coordinates.

Return Value

This example will offset all the line and rectangle objects to the left by 5 pixels

Visual Basic

Copy Code

Private Sub OffsetLinesAndRectangles(ByVal automation As AnnAutomation)    ' Loop through all the objects in the annotation container    For Each annObj As AnnObject In automation.Container.Objects       If (TypeOf annObj Is AnnLineObject) Then          Dim lineObj As AnnLineObject = DirectCast(annObj, AnnLineObject)          ' Move this line object to the left by 5 logical pixels          ' Convert the line points to logical (image coordinates)          Dim pts() As AnnPoint = {lineObj.StartPoint, lineObj.EndPoint}          pts = lineObj.ConvertObjectToLogicalPoints(pts)          ' Convert the points to pixels          Dim pt1Pixels As PointF = pts(0).ConvertTo(automation.Container.UnitConverter, AnnUnit.Pixel).ToPointF()          Dim pt2Pixels As PointF = pts(1).ConvertTo(automation.Container.UnitConverter, AnnUnit.Pixel).ToPointF()          ' Move them to the right          pt1Pixels.X -= 5          pt2Pixels.Y -= 5          ' Set it back to the line          pts(0) = New AnnPoint(pt1Pixels, AnnUnit.Pixel)          pts(1) = New AnnPoint(pt2Pixels, AnnUnit.Pixel)          pts = lineObj.ConvertLogicalToObjectPoints(pts)          lineObj.StartPoint = pts(0)          lineObj.EndPoint = pts(1)       ElseIf (TypeOf annObj Is AnnRectangleObject) Then          Dim rectObj As AnnRectangleObject = DirectCast(annObj, AnnRectangleObject)          ' Yes, get the bounds in pixels          ' Convert the rectangle bounds to logical (image coordinates)          Dim bounds As AnnRectangle = rectObj.ConvertObjectToLogicalRectangle(rectObj.Bounds)          ' Convert the bounds to pixels          Dim boundsPixels As RectangleF = bounds.ConvertTo(automation.Container.UnitConverter, AnnUnit.Pixel).ToRectangleF()          ' Move it to the right          boundsPixels.Offset(-5, 0)          ' Re-set to bounds          bounds = rectObj.ConvertLogicalToObjectRectangle(New AnnRectangle(boundsPixels, AnnUnit.Pixel))          rectObj.Bounds = bounds       End If    Next    ' Invalidate    automation.Viewer.Invalidate() End Sub

C#

Copy Code

private void OffsetLinesAndRectangles(AnnAutomation automation)  {     // Loop through all the objects in the annotation container     foreach(AnnObject annObj in automation.Container.Objects)     {        if(annObj is AnnLineObject)        {           AnnLineObject lineObj = annObj as AnnLineObject;           // Move this line object to the left by 5 logical pixels             // Convert the line points to logical (image coordinates)           AnnPoint[] pts = { lineObj.StartPoint, lineObj.EndPoint };             pts = lineObj.ConvertObjectToLogicalPoints(pts);             // Convert the points to pixels           PointF pt1Pixels = pts[0].ConvertTo(automation.Container.UnitConverter, AnnUnit.Pixel).ToPointF();           PointF pt2Pixels = pts[1].ConvertTo(automation.Container.UnitConverter, AnnUnit.Pixel).ToPointF();             // Move them to the right           pt1Pixels.X -= 5;           pt2Pixels.Y -= 5;             // Set it back to the line           pts[0] = new AnnPoint(pt1Pixels, AnnUnit.Pixel);           pts[1] = new AnnPoint(pt2Pixels, AnnUnit.Pixel);           pts = lineObj.ConvertLogicalToObjectPoints(pts);           lineObj.StartPoint = pts[0];           lineObj.EndPoint = pts[1];        }        else if(annObj is AnnRectangleObject)        {           AnnRectangleObject rectObj = annObj as AnnRectangleObject;             // Yes, get the bounds in pixels             // Convert the rectangle bounds to logical (image coordinates)           AnnRectangle bounds = rectObj.ConvertObjectToLogicalRectangle(rectObj.Bounds);             // Convert the bounds to pixels           RectangleF boundsPixels = bounds.ConvertTo(automation.Container.UnitConverter, AnnUnit.Pixel).ToRectangleF();             // Move it to the right           boundsPixels.Offset(-5, 0);             // Re-set to bounds           bounds = rectObj.ConvertLogicalToObjectRectangle(new AnnRectangle(boundsPixels, AnnUnit.Pixel));           rectObj.Bounds = bounds;        }     }       // Invalidate     automation.Viewer.Invalidate();  }

An AnnObject may contain various points, lines, curves and rectangles that denote the object coordinates and where it should be drawn on an image. Also, the AnnObject contains a Matrix object that may be updated with a transformation when the object is moved, rotated or sized. This transformation as well as the container's own transformation are used to translate an object point to image coordinates and then to the screen.

The coordinates stored in the object (for example, AnnLineObject.StartPoint or AnnRectangleObject.Bounds are called object coordinates. These coordinates do not translate 1 to 1 to pixel values on the image used in the annotations because of the transformation matrices involved.

The values corresponding to the object coordinates in pixels are called logical coordinates. For example, a logical coordinate of AnnLineObject.StartPoint is its pixel value (in top left-position) in the image it is annotating. Converting from object to logical coordinates is what happens when you call the AnnAutomation.Realize method.

To manipulate an object's position and size manually from outside the annotation framework, you need to first convert its coordinates to logical values, perform your own transformations, convert them back to object coordinates before setting them back to the object.

To convert a point or a group of points from object to logical coordinates, use the ConvertObjectToLogicalPoints method.

To convert a point or a group of points from logical to object coordinates, use the ConvertLogicalToObjectPoints method.

To convert a rectangle from object to logical coordinates, use the ConvertObjectToLogicalRectangle method.

To convert a rectangle from logical to object coordinates, use the ConvertLogicalToObjectRectangle method.

For an example on converting object to logical coordinates, refer to ConvertObjectToLogicalPoints.

Target Platforms: Microsoft .NET Framework 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family

Reference