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pst · #1 (**permalink**) 07-11-2005

Is it possible to extract the coordinates of a users drawn freeform shape?

Today I'm cheating, saving the map, and using a modified version of st2gpx to read back the coordinates.

There must be a "cleaner" solution.

(Using MFC/C++)

/Patrik

**Eric Frost** · #2 (**permalink**) 07-11-2005

Check out this code sample --

http://www.mp2kmag.com/importersub01.asp

This loops around all the vertices of a freeform and exports to a mif/mid. You should be able to make this work for you.

Eric

pst · #3 (**permalink**) 07-13-2005

I've been looking into that sample, but I have some problems translating the code to c++.

The real problem is that I can't seem to retreive the "Location objects" from the Shapes Vertices.

I use something like this:

Code:

	CMap0 m=m_Map.get_ActiveMap();
	CShapes myShapes=m.get_Shapes();
	long ns=myShapes.get_Count();
	if(ns>0)
	{
		VARIANT a; a.vt=VT_I4; a.lVal=1;

 		CShape myShape=myShapes.get_Item(&a);
		VARIANT v_coords=myShape.get_Vertices();

		??? HOWTO extract the CLocation objects from the Vertices array ???
	}

Any code samples available?

/Patrik

**Winwaed** · #4 (**permalink**) 07-13-2005

I'm not sure if it helps or not, but I have done the opposite (putting coords in shapes) in C++ in the following article:

http://www.mp2kmag.com/a113--plottin....mappoint.html

Note that I don't use MFC.

Richard

pst · #5 (**permalink**) 07-13-2005

After some trial & error coding with MFC variants and arrays, I finally got it working.

See below for a code sample.

/Patrik

Code:

void dlgZoneEdit::OnBnClickedShape()
{
	CMap0 m=m_Map.get_ActiveMap();
	CShapes myShapes=m.get_Shapes();
	long ns=myShapes.get_Count();
	if(ns>0)
	{
		VARIANT a; a.vt=VT_I4; a.lVal=1;

 		CShape myShape=myShapes.get_Item(&a);
		VARIANT v_coords=myShape.get_Vertices();
		COleSafeArray saRet(&v_coords);

    long iPoints;
    saRet.GetUBound(1, &iPoints);

		long index[1];
		for(int i=0;i<=iPoints;i++)
		{
			index[0]=i;
			COleVariant vData;
			saRet.GetElement(index,vData);
			
			double lat,lon;
			CLocation cl(vData.pdispVal);
			GetPos(m,cl,&lat,&lon);
		}
	}
}

[/code]

**Eric Frost** · #6 (**permalink**) 07-14-2005

Thanks for sharing.

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Getting the coordinates from a freeform shape

Getting the coordinates from a freeform shape

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Getting the coordinates from a freeform shape

Getting the coordinates from a freeform shape

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