Draw the border of the active region

Dear Leadtools specialists :-)
If I got an active region (or a non active drawing.region object) in my RasterImage, is there a possibilty to draw ONLY the border of the region? I mean something like the FillRegion method, but without filling. I just want a drawed border of the region (freehand, polygon, etc...).

I hope you understood me.

Can you maybe show me a little example for the use of "RasterImage.FrameRegion"? Would be very nice....

What LEADTOOLS version (14, 14.5, 15) do you have?
What is the programming language that you are using?

I'm using the newest evaluation version (15) of Leadtools and write in VB.net.

Thanks for any hints...

If
you create a region in the raster image viewer, it will automatically create an outline for the region. Here is a little example:

//------------------------

rasterImageViewer1.Image
= new RasterImage(RasterMemoryFlags.Conventional, 800, 600, 24, RasterByteOrder.Bgr, RasterViewPerspective.TopLeft, null, IntPtr.Zero, 0);

rasterImageViewer1.Image.AddEllipseToRegion(null, new Rectangle( 80, 90, 300, 220), RasterRegionCombineMode.Set);

//------------------------

Thank you, but this is not what I mean. My goal woul'd be to draw a line of the outlined region which stays displayed, also if I select another region. Maybe there is a method for this purpose?

What
do you mean by "stays displayed"? Do you want it to be part of the
pixel data? In other words, do you want to 'burn' such an outline on the image
itself, so that when you save the image and load it into any other viewer, the region outline becomes part of the image?

Also, what do you mean by "also if I select another region"? Can you please explain to me what is the behavior that you need.

Exactly, "burn" describes exactly what I mean.

Please try the code below and tell me if you face any problems:

 

//-------------------

rasterImageViewer2.Image = rasterImageViewer1.Image.Clone();

rasterImageViewer2.Image.MakeRegionEmpty();

RasterImageGdiPlusGraphicsContainer container = rasterImageViewer2.Image.CreateGdiPlusGraphics();

Graphics g = container.Graphics;

rasterImageViewer1.Image.FrameRegion(g, null, index);

MessageBox.Show(index.ToString());

codecs.Save(rasterImageViewer2.Image, @"c:\Temp\Region1.cmp", RasterImageFormat.Cmp, 24);
//-------------------

Thank you! This is more or less what I need. Is it maybe possible the set the color, and the style of the resulting line when we "burn" the region on the image. It's important for us, that we can differ the real, active region between the "burned" one.

Once, while experimenting, I found a method (but I do not remember the name anymore) which draw (or "burned") a red line out of the region an filled this new rectangle (or ellipse, depends on the kind of the region), with a transparent-red color. This without the filling, would be what I search.

Maybe you got some other hints? But thank you anyway for the help!

You
can try to define a new region based on the current region. The new region will
consist of a thin border at the boundaries of the old region, and when you have it, you fill it with red or any color you want.

To obtain this thin border region from the original region, do the following:

1. Take a copy of the original region using RasterImage.GetRegionData

2. Enlarge (or shrink) the original region using the ResizeRegionCommand Class

3. Combine the old region with the resized region using the  RasterImage.AddDataToRegion Method and the RasterRegionCombineMode.Xor flag.
 

After that, simply use the FillCommand Class to change the pixel colors inside the new thin region.