Hello,

after setting the `ZoomStep` in our project to something smaller than 1 (a feature we are very pleased to receive in the latest update) we encountered a problem when zooming in and out of our map view. I have attached screenshots and an example project to reproduce the issue. It occurs wether the renderer is set to SoftwareOnly or default.

Steps to reproduce:

1. Start the example project (MapZoomInitial.png)
   
2. Scroll the mouse wheel one click in to zoom in one step
3. Scroll the mouse wheel one click out to zoom out again
4. Artifacts appear (MapViewAfterZoomInAndOut.png)
   

Many tasks on RadMap require smooth zooming for the better user experience. For example, floor plans or facility layouts. Default zoom increments are too large for those tasks. We should provide a way to make zoom smooth while keeping zoom level as integer value.

Using wraparound True and Virtualization in VisualizationLayer.
When panning from left to right and placing rectangles over the requested regions, a gap could be seen on the left side. This is because the regions that get into viewport fire data request event when their top left point is inside the viewport. To cover the viewport, the topright point of the regions should be used instead.

If you update the Location of a map shape data object (for example, EllipseData, PolygonData, ect.) at run-time, while the clustering feature is enabled, the shape disappears.

To work this around, reset the clustering via the IsClusteringEnabled property when the Location changes.

this.ellipseShapeData = new Location(newLatitude, newLongitude);
this.visualizationLayer.ClusteringEnabled = false;
this.visualizationLayer.ClusteringEnabled = true;

Add support for digitizing complex wkt geometries.

Include support for adding, moving and deleting vertices.

/Brian

The behavior can be observed with the following setups:

new WmsTiledProvider("http://4maps.geo-solutions.it/geoserver/osm/wms")

            {
                Layers = "osm",
                Version = "1.3.0",
                Projection = "CRS:84" // WGS84, 1.3.0 Standard compatible
            };

and 

new WmsTiledProvider("http://4maps.geo-solutions.it/geoserver/osm/wms")

            {
                Layers = "osm",
                Version = "1.1.0",
                Projection = "EPSG:4326" // WGS84, 1.1.0 Standard compatible
            };