Rendering on to Page object

[Vyas Bharghava]

Hi all,

I have written a server-side component that renders some
charts as images. I want to give the charting classes
(Pie, Bar etc.) the ability to render themselves onto any
active page object. I envisage my users calling my
component from Aspx pages like:

Pie pie = new Pie(configXml);
Pie.Render(this);

The below code

renderer.aspx
-------------
......Page_Load()...
Pie pie = new Pie(configXml);
Response.ContentType = "image/png";
Response.BinaryWrite(pie.GetChartImage());
Response.End();

when used as an image source:

show.aspx
---------
<img src="renderer.aspx" />

works fine. But I want to do the above from within my
component. I can't use the same mechanism as that would
mean changing the content-type, which is not the behavior
I want.

I can embed an aspx file inside my component and extract
it at runtime and even make it call a code-behind page
class inside my component. But I'm unable to figure out
how this mechanism could be hooked to what I want.

Please help.

Regards,

Vyas

[Alvin Bruney]

You will need to include a page holder control in your pie, bar chart pages.
Then you can easily render to the placeholder image.

"Vyas Bharghava" <vyas_b@yahoo.com> wrote in message
news:051a01c3504b$b1916150$a001280a@phx.gbl...

> Hi all,
>
> I have written a server-side component that renders some
> charts as images. I want to give the charting classes
> (Pie, Bar etc.) the ability to render themselves onto any
> active page object. I envisage my users calling my
> component from Aspx pages like:
>
> Pie pie = new Pie(configXml);
> Pie.Render(this);
>
> The below code
>
> renderer.aspx
> -------------
> .....Page_Load()...
> Pie pie = new Pie(configXml);
> Response.ContentType = "image/png";
> Response.BinaryWrite(pie.GetChartImage());
> Response.End();
>
> when used as an image source:
>
> show.aspx
> ---------
> <img src="renderer.aspx" />
>
> works fine. But I want to do the above from within my
> component. I can't use the same mechanism as that would
> mean changing the content-type, which is not the behavior
> I want.
>
> I can embed an aspx file inside my component and extract
> it at runtime and even make it call a code-behind page
> class inside my component. But I'm unable to figure out
> how this mechanism could be hooked to what I want.
>
> Please help.
>
> Regards,
>
> Vyas

[Kevin Spencer]

In a webv page, embedded images are requested individually as the tags are
parsed by the browser. You can't put anything INTO a web page other than
text.
--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
[url]http://www.takempis.com[/url]
Big things are made up of
lots of little things.

"Vyas Bharghava" <vyas_b@yahoo.com> wrote in message
news:051a01c3504b$b1916150$a001280a@phx.gbl...

> Hi all,
>
> I have written a server-side component that renders some
> charts as images. I want to give the charting classes
> (Pie, Bar etc.) the ability to render themselves onto any
> active page object. I envisage my users calling my
> component from Aspx pages like:
>
> Pie pie = new Pie(configXml);
> Pie.Render(this);
>
> The below code
>
> renderer.aspx
> -------------
> .....Page_Load()...
> Pie pie = new Pie(configXml);
> Response.ContentType = "image/png";
> Response.BinaryWrite(pie.GetChartImage());
> Response.End();
>
> when used as an image source:
>
> show.aspx
> ---------
> <img src="renderer.aspx" />
>
> works fine. But I want to do the above from within my
> component. I can't use the same mechanism as that would
> mean changing the content-type, which is not the behavior
> I want.
>
> I can embed an aspx file inside my component and extract
> it at runtime and even make it call a code-behind page
> class inside my component. But I'm unable to figure out
> how this mechanism could be hooked to what I want.
>
> Please help.
>
> Regards,
>
> Vyas