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date: Sat, 27 Oct 2007 02:43:14 -0700,
group: microsoft.public.windows.developer.winfx.avalon
back
Re: Draw a circle in WPF
If you are generating a GIF file, then you are better off creating a new
Bitmap instance and then getting the Graphics instance for the bitmap
(through the static FromImage method on the Graphics class). Draw on that
using the Graphics instance, and then you can save the Bitmap (as a GIF of
course).
--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard.caspershouse.com
"Tem" wrote in message
news:uEKSP6NGIHA.5360@TK2MSFTNGP03.phx.gbl...
>I would like to use WPF because is the newer technology. However I could
>not find a code sample on how to do this.
> This is what I need to do
>
> The app has a button called generate circle
> when the buttons is clicked it generates a gif file of a circle in the
> local dir.
>
> From what I understand I don't need to use XAML, no UI here, just need to
> generate a gif file
>
> Thank you,
>
> Tem
>
>
> "Nicholas Paldino [.NET/C# MVP]" wrote
> in message news:EF26B6C7-FDF2-4E3A-85F4-4D9C608A85CE@microsoft.com...
>> Tem,
>>
>> This can be done in both WPF and in Windows Forms (through GDI). The
>> thing is, what are YOU using? If you are using Windows Forms, then in
>> the method you use to paint, you can use the DrawEllipse method on the
>> Graphics instance to draw a circle (just make sure to use a square for
>> the bounding coordinates and it will produce a circle).
>>
>> In WPF, you should just be able to add an Ellipse element into your
>> XAML with the same height and width.
>>
>> --
>> - Nicholas Paldino [.NET/C# MVP]
>> - mvp@spam.guard.caspershouse.com
>>
>> "Tem" wrote in message
>> news:eeG0X3HGIHA.3980@TK2MSFTNGP03.phx.gbl...
>>>I need to draw a black lined circle and save it as a gif file. Can this
>>>be done with wpf or do I need to use GDI+
>>> The examples I found seem to only apply to UI elements not a file.
>>>
>>> Thank you
>>>
>>> Tem
>>
>
date: Sat, 27 Oct 2007 19:19:06 -0400
author: Nicholas Paldino [.NET/C# MVP]
Re: Draw a circle in WPF
Hi,
Tem wrote:
> I would like to use WPF because is the newer technology. However I could
> not find a code sample on how to do this.
> This is what I need to do
>
> The app has a button called generate circle
> when the buttons is clicked it generates a gif file of a circle in the
> local dir.
>
> From what I understand I don't need to use XAML, no UI here, just need
> to generate a gif file
>
> Thank you,
>
> Tem
Saving any XAML scene to a picture is very easy. I prefer to use PNG, so
that's what this example is about, but I guess you can choose other formats:
using (FileStream fs = new FileStream(path, FileMode.OpenOrCreate))
{
PngBitmapEncoder enc = new PngBitmapEncoder();
enc.Frames.Add(
BitmapFrame.Create(CaptureScreenBitmap(this.RootImage)));
enc.Save(fs);
}
with:
private BitmapSource CaptureScreenBitmap(Panel panel)
{
return CaptureScreenBitmap(panel,
(int) panel.ActualWidth,
(int) panel.ActualHeight);
}
private BitmapSource CaptureScreenBitmap(Visual target,
int width,
int height)
{
Rect bounds = VisualTreeHelper.GetDescendantBounds(target);
RenderTargetBitmap renderBitmap
= new RenderTargetBitmap(width,
height,
96, 96,
PixelFormats.Pbgra32);
DrawingVisual visual = new DrawingVisual();
using (DrawingContext context = visual.RenderOpen())
{
VisualBrush brush = new VisualBrush(target);
context.DrawRectangle(brush,
null,
new Rect(new Point(), bounds.Size));
}
renderBitmap.Render(visual);
return renderBitmap;
}
HTH,
Laurent
--
Laurent Bugnion [MVP ASP.NET]
Software engineering, Blog: http://www.galasoft.ch
PhotoAlbum: http://www.galasoft.ch/pictures
Support children in Calcutta: http://www.calcutta-espoir.ch
date: Sun, 28 Oct 2007 01:56:59 +0200
author: Laurent Bugnion, MVP
Re: Draw a circle in WPF
Thank you for the example, there's one thing
what should i replace this.RootImage with?
Tem
"Laurent Bugnion, MVP" wrote in message
news:O$8YRUPGIHA.936@TK2MSFTNGP06.phx.gbl...
> Hi,
>
> Tem wrote:
>> I would like to use WPF because is the newer technology. However I could
>> not find a code sample on how to do this.
>> This is what I need to do
>>
>> The app has a button called generate circle
>> when the buttons is clicked it generates a gif file of a circle in the
>> local dir.
>>
>> From what I understand I don't need to use XAML, no UI here, just need
>> to generate a gif file
>>
>> Thank you,
>>
>> Tem
>
> Saving any XAML scene to a picture is very easy. I prefer to use PNG, so
> that's what this example is about, but I guess you can choose other
> formats:
>
> using (FileStream fs = new FileStream(path, FileMode.OpenOrCreate))
> {
> PngBitmapEncoder enc = new PngBitmapEncoder();
> enc.Frames.Add(
> BitmapFrame.Create(CaptureScreenBitmap(this.RootImage)));
> enc.Save(fs);
> }
>
> with:
>
> private BitmapSource CaptureScreenBitmap(Panel panel)
> {
> return CaptureScreenBitmap(panel,
> (int) panel.ActualWidth,
> (int) panel.ActualHeight);
> }
>
> private BitmapSource CaptureScreenBitmap(Visual target,
> int width,
> int height)
> {
> Rect bounds = VisualTreeHelper.GetDescendantBounds(target);
> RenderTargetBitmap renderBitmap
> = new RenderTargetBitmap(width,
> height,
> 96, 96,
> PixelFormats.Pbgra32);
>
> DrawingVisual visual = new DrawingVisual();
> using (DrawingContext context = visual.RenderOpen())
> {
> VisualBrush brush = new VisualBrush(target);
> context.DrawRectangle(brush,
> null,
> new Rect(new Point(), bounds.Size));
> }
> renderBitmap.Render(visual);
> return renderBitmap;
> }
>
> HTH,
> Laurent
> --
> Laurent Bugnion [MVP ASP.NET]
> Software engineering, Blog: http://www.galasoft.ch
> PhotoAlbum: http://www.galasoft.ch/pictures
> Support children in Calcutta: http://www.calcutta-espoir.ch
date: Sun, 28 Oct 2007 21:08:25 -0700
author: Tem
Re: Draw a circle in WPF
Hi,
Tem wrote:
> Thank you for the example, there's one thing
>
> what should i replace this.RootImage with?
>
>
> Tem
In my example, the RootImage is the panel containing the scene that you
want to capture to an image. It can be a grid, a canvas, etc...
Laurent
>
> "Laurent Bugnion, MVP" wrote in message
> news:O$8YRUPGIHA.936@TK2MSFTNGP06.phx.gbl...
>> Hi,
>>
>> Tem wrote:
>>> I would like to use WPF because is the newer technology. However I
>>> could not find a code sample on how to do this.
>>> This is what I need to do
>>>
>>> The app has a button called generate circle
>>> when the buttons is clicked it generates a gif file of a circle in
>>> the local dir.
>>>
>>> From what I understand I don't need to use XAML, no UI here, just
>>> need to generate a gif file
>>>
>>> Thank you,
>>>
>>> Tem
>>
>> Saving any XAML scene to a picture is very easy. I prefer to use PNG,
>> so that's what this example is about, but I guess you can choose other
>> formats:
>>
>> using (FileStream fs = new FileStream(path, FileMode.OpenOrCreate))
>> {
>> PngBitmapEncoder enc = new PngBitmapEncoder();
>> enc.Frames.Add(
>> BitmapFrame.Create(CaptureScreenBitmap(this.RootImage)));
>> enc.Save(fs);
>> }
>>
>> with:
>>
>> private BitmapSource CaptureScreenBitmap(Panel panel)
>> {
>> return CaptureScreenBitmap(panel,
>> (int) panel.ActualWidth,
>> (int) panel.ActualHeight);
>> }
>>
>> private BitmapSource CaptureScreenBitmap(Visual target,
>> int width,
>> int height)
>> {
>> Rect bounds = VisualTreeHelper.GetDescendantBounds(target);
>> RenderTargetBitmap renderBitmap
>> = new RenderTargetBitmap(width,
>> height,
>> 96, 96,
>> PixelFormats.Pbgra32);
>>
>> DrawingVisual visual = new DrawingVisual();
>> using (DrawingContext context = visual.RenderOpen())
>> {
>> VisualBrush brush = new VisualBrush(target);
>> context.DrawRectangle(brush,
>> null,
>> new Rect(new Point(), bounds.Size));
>> }
>> renderBitmap.Render(visual);
>> return renderBitmap;
>> }
>>
>> HTH,
>> Laurent
>> --
>> Laurent Bugnion [MVP ASP.NET]
>> Software engineering, Blog: http://www.galasoft.ch
>> PhotoAlbum: http://www.galasoft.ch/pictures
>> Support children in Calcutta: http://www.calcutta-espoir.ch
>
--
Laurent Bugnion [MVP ASP.NET]
Software engineering, Blog: http://www.galasoft.ch
PhotoAlbum: http://www.galasoft.ch/pictures
Support children in Calcutta: http://www.calcutta-espoir.ch
date: Mon, 29 Oct 2007 13:19:55 +0100
author: Laurent Bugnion, MVP
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