topic Re: WaveformGraph to Image in Measurement Studio for .NET Languages

WaveformGraph to Image

dprice — Wed, 17 Mar 2004 18:32:23 GMT

Hello,

I am interested in converting a WaveformGraph's System.Drawing.Graphics object used in the PrintPage handler to a System.Drawing.Image object. Here's what I'm trying to do:

Graphics g = e.Graphics;
Rectangle bounds = e.MarginBounds;
waveformGraph1.Draw( new ComponentDrawArgs( g, bounds ) ) ;

Image img = g.?? ;

Can this be done or is there a better method of doing this?

Thanks in advance!
Derek

Re: WaveformGraph to Image

Abhishek Ghuwalewala — Wed, 17 Mar 2004 18:59:38 GMT

Derek,

I am assuming e.Graphics is the Graphics object from the event arguments of the PrintPage handler.

I don't think there is a way to go from a Graphics object to an Image. You can create another Graphics object from an existing Image. For this example, assume that the Image that you are trying to create is a Bitmap. Then, your code would be modified to look something like this:

Graphics g = e.Graphics;
Rectangle bounds = e.MarginBounds;
waveformGraph1.Draw( new ComponentDrawArgs( g, bounds ) ) ;

// This will draw the printed output to an image
// of type bitmap. You can substitute Bitmap
// to be any other Image derived type.
Bitmap img = new Bitmap(bounds);
Graphics imgGraphics = Graphics.FromImage(img);
waveformGraph1.Draw( new
ComponentDrawArgs( imgGraphics, bounds ) );

Hope this helps.

Abhishek Ghuwalewala
Measurement Studio

Re: WaveformGraph to Image

Elton Wells — Wed, 17 Mar 2004 19:02:40 GMT

You don't convert a Graphics object to an image - the Graphics class provides the ability to draw to a device context where that context can be an image, the screen, a printer, etc. What you can do, though, is create an image, then get a Graphics object from the image, then drawing operations on that Graphics object will be directed to the image. So, for example, if you wanted to dynamically create an image and draw the WaveformGraph to it, you could do this:

using NationalInstruments.UI;
using System.Drawing.Imaging;

// ...

Size imageSize = new Size(300, 200);

using (Bitmap bitmap = new Bitmap(imageSize.Width, imageSize.Height, PixelFormat.Format32bppArgb))
using (Graphics g = Graphics.FromImage(bitmap))
{
waveformGraph1.Draw(new Compon
entDrawArgs(g, new Rectangle(new Point(0, 0), imageSize)));

// ...
}

- Elton

Re: WaveformGraph to Image

dprice — Wed, 17 Mar 2004 19:40:32 GMT

Hi Elton,

This is exactly what I want! I found a .NET Report Printing library that makes it very easy to print text, headers, footers, columns, tables, and images (via System.Image), but it does it separately from the PrintPage event handler. I couldn't figure out how to get the Image independently from this event.

Thanks again,
Derek

Re: WaveformGraph to Image

dprice — Mon, 26 Apr 2004 18:56:47 GMT

Hi Elton,

I finally had a chance to go back and work on this, but had a question. Your code does exactly what I need, but the image is not very good. I've attached an image of a portion of the app running and the print preview using your suggested method. It's very grainy. Any ideas on how to fix this?

Thanks,
Derek

Re: WaveformGraph to Image

dprice — Tue, 27 Apr 2004 13:52:00 GMT

Hi Elton,

I've attached a sample that demostrates this. The screenshots above don't really show the problem.

Thanks,
Derek

Re: WaveformGraph to Image

penewman — Wed, 01 Feb 2006 00:45:21 GMT

Has anyone found a better solution to this problem?

The print preview results are a little out-of-focus.

Re: WaveformGraph to Image

bilalD — Wed, 01 Feb 2006 15:38:20 GMT

Try making the size of the bitmap the same size as the graph control

private Image GetWaveformGraphImage()
        {
            Size imageSize = waveformGraph1.Size ;
            Image bitmap = new Bitmap( imageSize.Width, imageSize.Height, PixelFormat.Format32bppArgb ) ;
            using ( Graphics g = Graphics.FromImage( bitmap ) )
            {
                waveformGraph1.Draw( new ComponentDrawArgs( g, new Rectangle(new Point(0, 0), imageSize ) ) );
            }
            return bitmap;
        }

I think this should clear up the graph image.
Hope this helps.

Re: WaveformGraph to Image

penewman — Wed, 01 Feb 2006 15:49:10 GMT

great idea
thanks

a question

shir — Sun, 12 Mar 2006 02:10:59 GMT

hi everybody

I have used waveformGraph in my code and I can show the data I give on the screen ok but does anyone know how I can get data that is shown on the screen anytime?

I mean is there any function I can use the get the data of the waveformGraph?

thank you

Re: a question

drohacek — Sun, 12 Mar 2006 17:20:16 GMT

Use WaveformPlot.GetXData() and WaveformPlot.GetYData() to obtain the data for a particular plot.

thanks

shir — Sat, 18 Mar 2006 19:01:51 GMT

that really helped

thank you

Cursors in a WaveformGraph

shir — Wed, 29 Mar 2006 17:16:39 GMT

Hello everybody,

I have used cursors in the waveformGraph but when I move the cursors (while I have a signal running on the waveformGraph) the signals stop moving no matter on what mode the cursurs are.

is there a way I change the cursors position whitout interfering the signals plotting?

I really appreciate ane help.

thank you

a question

shir — Wed, 29 Mar 2006 19:18:07 GMT

Hi everyone,

could anyone please tell me how I can make an exe file of my project ?

thakx

Re: a question

Tyler T. — Thu, 30 Mar 2006 23:42:44 GMT

Shir,

Is your question how to distribute Measurement Studio applications, or simply how to build an exe. If your project target is a Windows Application, then you should already have an executable that is built whenever you hit the Run button in Visual Studio. Check your project files for a Debug or Release directory for the actual executable.

If your question pertains to the distribution of Measurement Studio applications, there is a section in the Measurement Studio help that discusses deployment. On the main Measurement Studio page there is a link to the Deploying Measurement Studio Applications help document.

For future reference, you may have better luck if you post unrelated questions in new threads. Many users may miss these questions because they are attached to an unrelated thread.

Please let me know if you have any further questions.

Thanks,

Tyler Tigue

thanks

shir — Sat, 01 Apr 2006 18:23:16 GMT

Thanks Tyler

I found the way.

Thank you for the answer