WPF Custom Drawing

I plan on implementing the equivalent of something along the lines of
the bandwidth meter or performance meter in task manager in a wpf
control and was wondering where I should start.

In the windows world, I'd inherit from UserControl, override onPaint,
get a graphics context and starting painting.

I'm having a bit of a problem grasping where to start in custom drawing
my own control from scratch and was wondering if anyone could give me a
few hints.

I dont mind writing my own code, I know the actual painting part, I'll
just change my pens stroke fill color etc... and draw the geometrys, but
I dont have a reference to a surface to draw.

Thanks in advance
Weston

karsten has already done this for you, and he updated it to latest bits.

http://blogs.msdn.com/karstenj/archi...08/622982.aspx



"Weston Weems" wrote:

> I plan on implementing the equivalent of something along the lines of
> the bandwidth meter or performance meter in task manager in a wpf
> control and was wondering where I should start.
>
> In the windows world, I'd inherit from UserControl, override onPaint,
> get a graphics context and starting painting.
>
> I'm having a bit of a problem grasping where to start in custom drawing
> my own control from scratch and was wondering if anyone could give me a
> few hints.
>
> I dont mind writing my own code, I know the actual painting part, I'll
> just change my pens stroke fill color etc... and draw the geometrys, but
> I dont have a reference to a surface to draw.
>
> Thanks in advance
> Weston
>

Well actually that was exactly along the lines of what I was looking
for, except I was looking to wrap this into my own custom control. So
equivalent of onRender or onPaint I dont need to worry abotu getting a
canvas and drawing everything manually by hand?

I can just take base element, get drawing context and then start drawing
geometry?

Thanks
Weston


TheRHogue wrote:
> karsten has already done this for you, and he updated it to latest bits.
>
> http://blogs.msdn.com/karstenj/archi...08/622982.aspx
>
>
>
> "Weston Weems" wrote:
>
>> I plan on implementing the equivalent of something along the lines of
>> the bandwidth meter or performance meter in task manager in a wpf
>> control and was wondering where I should start.
>>
>> In the windows world, I'd inherit from UserControl, override onPaint,
>> get a graphics context and starting painting.
>>
>> I'm having a bit of a problem grasping where to start in custom drawing
>> my own control from scratch and was wondering if anyone could give me a
>> few hints.
>>
>> I dont mind writing my own code, I know the actual painting part, I'll
>> just change my pens stroke fill color etc... and draw the geometrys, but
>> I dont have a reference to a surface to draw.
>>
>> Thanks in advance
>> Weston
>>

If you need to draw on a per frame level, like in DirectX, you would go this
route:

CompositionTarget.Rendering += new EventHandler(CompositeRendering);

The CompositeRendering callback is called on a per frame basis. You can draw
whatever you like into your canvas at this point using WPF geometry API's.

You should find SDK material on the API. I have a 3D sample that uses this
for per frame z-order sorting in my sample pack at
http://www.therhogue.com/WinFX .


"Weston Weems" wrote:

> Well actually that was exactly along the lines of what I was looking
> for, except I was looking to wrap this into my own custom control. So
> equivalent of onRender or onPaint I dont need to worry abotu getting a
> canvas and drawing everything manually by hand?
>
> I can just take base element, get drawing context and then start drawing
> geometry?
>
> Thanks
> Weston
>
>
> TheRHogue wrote:
> > karsten has already done this for you, and he updated it to latest bits.
> >
> > http://blogs.msdn.com/karstenj/archi...08/622982.aspx
> >
> >
> >
> > "Weston Weems" wrote:
> >
> >> I plan on implementing the equivalent of something along the lines of
> >> the bandwidth meter or performance meter in task manager in a wpf
> >> control and was wondering where I should start.
> >>
> >> In the windows world, I'd inherit from UserControl, override onPaint,
> >> get a graphics context and starting painting.
> >>
> >> I'm having a bit of a problem grasping where to start in custom drawing
> >> my own control from scratch and was wondering if anyone could give me a
> >> few hints.
> >>
> >> I dont mind writing my own code, I know the actual painting part, I'll
> >> just change my pens stroke fill color etc... and draw the geometrys, but
> >> I dont have a reference to a surface to draw.
> >>
> >> Thanks in advance
> >> Weston
> >>
>