How do I get the width (in pixels) of a CWGraph with ComponentWorks 2.0 & VC++?

[he3dude]

I'm trying to move an X-axis cursor in a CWGraph by either clicking the mouse to the left or right of the cursor. The problem is when I use the class MouseDown the input position values (long x, long y) are in pixels & not to scale for the x-axis.

Thus, if I have 10 plotted points on a CWGraph that is XXX by YYY pixels I have to know ahead of time the dimension XXX in order to accurately determine where OnMouseDown occurs.

There has to be a member of CWGraph that returns this value but I'm having a real hard time finding what I need in the cryptic online help that is associated with ComponentWorks 2.0, which seems to cater to the VBasic crowd & not the VC++ programme
rs, of which I belong to.

[Chris Matthews]

If you want the size of the control in pixels, it's the same as for any control or window in Visual C++ whether ComponentWorks or otherwise. You just get the window rect with GetClientRect, then look at the size of the rect returned. If you want to get the size of the plot area (not the whole control), you can get that from getting the PlotAreaImage which will return a CWPictureDisp that you can get the width and height of.

Best Regards,

Chris Matthews
Measurement Studio Support Manager

[Joerg P]

Hi,
I still have a problem in geting
Window Coords for the Plot Area of a CNiGraph (under VC++) :

What I do (inside of CNiGraph derived) :
//
CNiImage image = Images("Plot Area");
image.SetUrl("C:\\WINDOWS\\Circles.bmp");
image.Reload();
CNiPicture Picture = image.GetPicture();
int width = Picture.GetWidth();
//
width is 847,
and that is, I think,
the Himetric (1/1000 m) width of the
bitmap ploted on my Display.

The width doesent change, if I
resize the CNiGraph Ctrl !

So, is there a nother way to calculate the
actual size of the Plot Area ??

Yours,
Joerg Peleikis

[Chris Matthews]

Actually, my previous response is incorrect. The plot area images is just used for setting the plot area background image, not retrieving the current size. This image only gets updated when you change to a different image, not on resizes. Unfortunately, this means there is no way to find out plot area size. I will file a report to add that functionality to the graph control in the future.

Best Regards,

Chris Matthews
Measurement Studio Support Manager