Cropping an Image in elliptical shape

Hi,

Is it possible to crop an image in elliptical shape using leadtool 15 in C# .net,if so then how??

Thanks
Manju

Hello,

In general, there are no elliptical images. Images always have rectangular shape. There is no direct way to crop the image in elliptical shape.

However, you can get an elliptical shape for the image by adding an elliptical region on the image, and then fill the region outside the ellipse with black or white color.


Also, you may try to workaround this by creating an elliptical region on the image, convert this region to floater image and then copy or save the floater image.
You can do this by using the following code:
+-------------+
RasterCodecs.Startup()
Dim codecs As RasterCodecs = New RasterCodecs()

Dim image As RasterImage = RasterImageViewer1.Image.Clone()

Dim xform As RasterRegionXForm = New RasterRegionXForm()
xform.ViewPerspective = RasterViewPerspective.TopLeft
xform.XOffset = 0
xform.YOffset = 0
xform.XScalarDenominator = 1
xform.XScalarNumerator = 1
xform.YScalarDenominator = 1
xform.YScalarNumerator = 1

Dim rc As Rectangle = New Rectangle(image.ImageWidth \ 4, image.ImageHeight \ 4, image.ImageWidth \ 3, image.ImageHeight \ 3)

image.AddEllipseToRegion(xform, rc, RasterRegionCombineMode.Set)

RasterImageViewer1.EnableTimer = True
RasterImageViewer1.RegionToFloater()
RasterImageViewer1.FloaterVisible = True
RasterImageViewer1.AnimateFloater = True

RasterImageViewer1.Image.MakeRegionEmpty()
image = RasterImageViewer1.FloaterImage.Clone()
RasterImageViewer1.FloaterImage = Nothing
RasterImageViewer1.Image = image.Clone()

RasterCodecs.Shutdown()
+-------------+

Please let me know if this helps.

Thanks,
Maen Badwan
LEADTOOLS Technical Support

If i use above code i will get exception at
image = RasterImageViewer1.FloaterImage.Clone()

that object reference not set to an instance,value of RasterImageViewer1.FloaterImage remaince null
and if i set RasterImageViewer1.FloaterImage=image
before
image = RasterImageViewer1.FloaterImage.Clone()
this statement it works but only draws ellipse on image.
Tell me how to extract any region like ellipse or free hand region from an image in c# .net and leadtools 15.Please Reply ASAP

Thanks
Manju

Hello,

Try to use the following code:
+---------------------------+
RasterCodecs.Startup()
Dim codecs As RasterCodecs = New RasterCodecs()
Dim image As RasterImage = RasterImageViewer1.Image

Dim rc As Rectangle = New Rectangle(image.ImageWidth \ 4, image.ImageHeight \ 4, image.ImageWidth \ 3, image.ImageHeight \ 3)

image.AddEllipseToRegion(Nothing, rc, RasterRegionCombineMode.Set)

RasterImageViewer1.EnableTimer = True
RasterImageViewer1.RegionToFloater()
RasterImageViewer1.FloaterVisible = True
RasterImageViewer1.AnimateFloater = True

image = RasterImageViewer1.FloaterImage.Clone()
RasterImageViewer1.FloaterImage = Nothing

RasterImageViewer1.Image = image.Clone()

rc = RasterImageViewer1.Image.GetRegionBounds(Nothing)

RasterImageViewer1.Image.MakeRegionEmpty()
RasterImageViewer1.Image.AddEllipseToRegion(Nothing, rc, RasterRegionCombineMode.SetNot)

Dim command As FillCommand = New FillCommand()
command.Color = New RasterColor(0, 0, 255)
command.Run(RasterImageViewer1.Image)

RasterCodecs.Shutdown()
+---------------------------+

Thanks,
Maen Badwan
LEADTOOLS Technical Support

Hi,

Please check the attached form.cs file and screen shot,as show in image i want that only selected region will get displayed,so will you please tell me what changes i should do in code to get that result.
Please reply soon.

Thanks
Manju

Hello,

I checked your code with the screenshot image.
To display the selected region only on the RasterImageViewer, try to sue the following code:
+-----------------------+
Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click

RasterImageViewer1.InteractiveMode = RasterViewerInteractiveMode.Region
RasterImageViewer1.InteractiveRegionType = RasterViewerInteractiveRegionType.Freehand

End Sub

Private Sub Button10_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button10.Click

RasterImageViewer1.RegionToFloater()
RasterImageViewer1.FloaterVisible = True

RasterImageViewer1.InteractiveMode = RasterViewerInteractiveMode.Floater
RasterImageViewer1.Image.MakeRegionEmpty()

RasterImageViewer1.Image = Nothing
RasterImageViewer1.Image = RasterImageViewer1.FloaterImage

Dim rc As Rectangle = RasterImageViewer1.Image.GetRegionBounds(Nothing)
RasterImageViewer1.Image.MakeRegionEmpty()
RasterImageViewer1.Image.AddEllipseToRegion(Nothing, rc, RasterRegionCombineMode.SetNot)

Dim command As FillCommand = New FillCommand()
command.Color = New RasterColor(RasterImageViewer1.BackColor)
command.Run(RasterImageViewer1.Image)

RasterImageViewer1.FloaterImage = Nothing
RasterImageViewer1.Image.MakeRegionEmpty()

End Sub
+-----------------------+

Please let me know if this helps.

Thanks,
Maen Badwan
LEADTOOLS Technical Support