topic Re: ArcEngine 9.3 .Net Framework in ArcObjects SDK Questions

ArcEngine 9.3 .Net Framework

IdrissEL_Achabi — Wed, 18 Apr 2012 13:57:13 GMT

Hi !

I recover a point in pGeometry (type : Igeometry) , and I would like to draw it in the screen, but I have some troubles with the following code :

            Dim pGraphicsContainer As IGraphicsContainer
            pGraphicsContainer = Form1.AxMapControl1.Map.BasicGraphicsLayer
            Dim ppoint As IPoint
            ppoint = New Point
            ppoint = pGeometry !!!
            pGraphicsContainer.AddElement(pElement, 0)
            Form1.AxMapControl1.Refresh()

The cast is impossible between ppoint and pgeometry !!!

Re: ArcEngine 9.3 .Net Framework

GeorgeFaraj — Sat, 11 Dec 2021 07:05:06 GMT

Hi !

I recover a point in pGeometry (type : Igeometry) , and I would like to draw it in the screen, but I have some troubles with the following code :

            Dim pGraphicsContainer As IGraphicsContainer
            pGraphicsContainer = Form1.AxMapControl1.Map.BasicGraphicsLayer
            Dim ppoint As IPoint
            ppoint = New Point
            ppoint = pGeometry !!!
            pGraphicsContainer.AddElement(pElement, 0)
            Form1.AxMapControl1.Refresh()

The cast is impossible between ppoint and pgeometry !!!

Not exactly sure what you are trying to achieve (surely there is more code than this?) but if you want to construct a Point then:

        // in C#
        IPoint point = new PointClass();
        point.PutCoords( YourX, YourY );

this will do it.

Re: ArcEngine 9.3 .Net Framework

AlexanderGray — Thu, 19 Apr 2012 12:38:15 GMT

All points are geometries, not all geometries are points.
It is possible that the igeometry passed in is of a different type like line, polygon etc.
if you write something like this, a failed cast will return null.
ppoint = trycast( pGeometry, IPoint)
If ppoint isnot nothing then
'do something
else
'geometry is not point
end if

You may also consider using IGeometry.GeometryType