Vista - Using WPF to Generate an Image

I'm still trying to figure out how to do this simple task with WPF.
I need to draw a black circle using WPF and generate an image file. (gif or
png)

Any help is greatly appreciated.

Tem





I used the following but it resulted in a blank file. I cannot figure out
what is wrong with it.

RenderTargetBitmap rtb = new RenderTargetBitmap(200, 200, 96, 96,
PixelFormats.Pbgra32);

Ellipse cir = new Ellipse();
cir.Height = 50;
cir.Width = 50;
cir.Stroke = Brushes.Black;
cir.StrokeThickness = 1.0;

rtb.Render(cir);

PngBitmapEncoder png = new PngBitmapEncoder();
png.Frames.Add(BitmapFrame.Create(rtb));
using (Stream fs= File.Create("test.png"))
{
png.Save(fs);
}

"Tem" <tem1232@xxxxxx> wrote in message
news:u9g8U5ZHIHA.536@xxxxxx

You are missing something like:

cir.Arrange(new Rect(new Size(50, 50)));

Note that you might get quicker answers when you consult (and post) to the
msdn WPF forum first
http://forums.microsoft.com/MSDN/Sho...D=119&SiteID=1

Willy.

Thank you so much, I got it to work.

Another simple question:
I need to add another circle, slightly smaller, 45 in diameter to the same
image. the final image should be a ring.
What would be the command to add another shape?



Here's my code:

RenderTargetBitmap rtb = new RenderTargetBitmap(200, 200, 96,
96,PixelFormats.Pbgra32);

Ellipse cir = new Ellipse();
cir.Height = 50;
cir.Width = 50;
cir.Stroke = Brushes.Black;
cir.StrokeThickness = 1.0;

cir.Arrange(new Rect(new Size(50, 50)));

rtb.Render(cir);

PngBitmapEncoder png = new PngBitmapEncoder();
png.Frames.Add(BitmapFrame.Create(rtb));
using (Stream fs= File.Create("test.png"))
{
png.Save(fs);
}

"Tem" <tem1232@xxxxxx> wrote in message
news:OKfsEb0HIHA.1208@xxxxxx
Draw a new ellipse inside the first one and render.

...
rtb.Render(cir);
cir.Height = 45;
cir.Width = 45;
cir.Arrange(new Rect(new Size(50, 50)));
rtb.Render(cir);
....

Willy.

Hello,
What's the NNTP address for that forum?

(H) Serge

Hi,

Serge Baltic wrote:There is none. It's unfortunate, but Microsoft is slowly pulling out of
NNTP and keeping all the forums on the web. There is a RSS feed though.

HTH,
Laurent
--
Laurent Bugnion [MVP ASP.NET]
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