Programmatically Draw Line

[darryl2001]

Is there a way to programmatically draw a line on the front panel of a VI?

[unclebump]

You can draw lines inside a picture control. You can make the background and the border transparent and you would not know the picture is present when you turn off the label.

[unclebump]

Here is a sample in 7.0 format.

[gwd]

Well there IS another way where you control the properties of a decoration (which can be a line).

Have a look at the attached, it could be modified to control the origin, etc. of the line.

[darryl2001]

Yes, this is the kind of thing I was looking for.  But is there a way to create the line (or any control for that matter) programmatically?

Thanks

[falkpl]

Outside of scripting (another topic all together) there is no methods for programatically creating controls as you could in a language such as c++ or c# with a constructor.  All control references are built at design time and are stored in the object[] properity of the owner vi.  This is because Labview is a managed memory language and is based on data flow (so all objects are known).  What exactly are you trying to do, if it is just drawing then I would suggest the embedded transparent picture control (much like having a 2d device context or a canvas to work with)  If you are doing something more static then a combination of visible/not visible objects and pictures might work.

Paul 

[darryl2001]

My customer wants to be able to create (at runtime) a "process map" where they can drag around icons (thermometer, tank, etc) and put lines between them to represent their plant process and have the data values change in the icons, etc.

[Ben]

Darryl wrote;

"

My customer wants to be able to create (at runtime) a "process map" where they can drag around icons (thermometer, tank, etc) and put lines between them to represent their plant process and have the data values change in the icons, etc.

"

I have done similar stuff in multiple apps using the picture control.

Check out this thread were I have collected posts about the Picture control.

http://forums.ni.com/ni/board/message?board.id=BreakPoint&message.id=14&jump=true

Warning:

There is NO "out-of-the-box" solution for this. It must all be coded. But, it can be done.

Ben

[gwd]

Interesting question. I don't see a way to do that. However, you CAN make an existing decoration visible or invisible, again using a property node.

[Jarrod_S.]

This thread might help you too. The premise is slightly different, but many of the suggestions are valid for your application.