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OverviewSuppose you use BitmapViewer control along with VobjectRubberband attached to it in your application to display an image and some overlaid vector objects. The users can edit these objects interactively: for example, move and resize them. After you finished this functionality you got a task to rotate the image and vector objects over it at 90 degrees. If you try to rotate the image loaded into BitmapViewer using Rotate method, vector objects are not rotated automatically. Resolution To rotate vector objects after the image is rotated you need to get each of them and perform the rotation by-hand. The rotation should be done around the center of image loaded into BitmapViewer. As you know each vector object has matrix that describes all transformations applied to this object. In terms of algebra to rotate an object around some point you should add two operations to this matrix: - Translate origin of coordinates to the specified point.
- Rotate the object.
The following code sample demonstrates how to perform these operations: Code:
Private Sub Form1_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
BitmapViewer1.Rubberband = VObjectsRubberband1
BitmapViewer1.Bitmap.Load("c:\1.tif")
End Sub
Private Sub AddText_Click(ByVal sender As System.Object, ByVal e As _
System.EventArgs) Handles Button1.Click
Dim recF As New RectangleF(0, 0, 100, 100)
Dim ff As New Aurigma.GraphicsMill.WinControls.TextVObject("Hello", _
"Tahoma", 20, recF)
VObjectsRubberband1.CurrentLayer.VObjects.Add(ff)
End Sub
Private Sub AddRectangle_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button2.Click
Dim recF As New RectangleF(250, 250, 150, 150)
Dim ff As New Aurigma.GraphicsMill.WinControls.RectangleVObject(recF)
ff.Brush = Brushes.Blue
VObjectsRubberband1.CurrentLayer.VObjects.Add(ff)
End Sub
Private Sub Rotate_Click(ByVal sender As System.Object, ByVal e As _
System.EventArgs) Handles Button3.Click
Dim w, h As Single
If BitmapViewer1.ScaleToActualSize Then
w = BitmapViewer1.WorkspaceWidth
h = BitmapViewer1.WorkspaceHeight
Else
w = Aurigma.GraphicsMill.UnitConverter.ConvertPixelsToUnits(96.0, _
BitmapViewer1.Bitmap.Width, Aurigma.GraphicsMill.Unit.Point)
h = Aurigma.GraphicsMill.UnitConverter.ConvertPixelsToUnits(96.0, _
BitmapViewer1.Bitmap.Height, Aurigma.GraphicsMill.Unit.Point)
End If
Dim i As Integer
For i = 0 To VObjectsRubberband1.CurrentLayer.VObjects.Count - 1
VObjectsRubberband1.CurrentLayer.VObjects.Item(i).Transform. _
RotateAt(90, New PointF(w/2, h/2), Drawing2D.MatrixOrder.Append)
VObjectsRubberband1.CurrentLayer.VObjects.Item(i).Update()
Next
BitmapViewer1.Bitmap.Transforms.Rotate(90)
For i = 0 To VObjectsRubberband1.CurrentLayer.VObjects.Count - 1
VObjectsRubberband1.CurrentLayer.VObjects.Item(i).Transform. _
Translate((h - w) / 2, (w - h) / 2, Drawing2D.MatrixOrder.Append)
VObjectsRubberband1.CurrentLayer.VObjects.Item(i).Update()
Next
End Sub
Edited by user Saturday, October 4, 2008 6:15:53 PM(UTC)
| Reason: Not specified |
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