EasyGIS.NET
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wfletcher
Drawing Circles on SFMAP
Hello, is there a method of drawing circles on the EASYGIS.NET SFMAP Control? I would like to be able to draw a circle with a certain center point (lat/long) and a radius in Kilometers. Is there a way to accomplish this in easygis.net? I haven't seen an example that shows drawing circles with the SFmap.
The control does not include a method to do this, but you can add a paint event handler to do this using standard .net graphics operations. these methods will convert pixel coordinates to map gis coordinates. https://easygis.net/api/output/html/M_EGIS_Controls_SFMap_PixelCoordToGisPoint_2_4ac95b2b.htm https://easygis.net/api/output/html/M_EGIS_Controls_SFMap_GisPointToPixelCoord_1_cfca3a5a.htm
Another thing to consider. The SFMap control has functions to select features intersecting a rectangle or circle. Load a shapefile and set it’s RenderSettings.IsSelectable property to true. Then hold the Shift or Ctrl key down and then drag the mouse with the left or right mouse button down. A rectangle/circle will be drawn and features selected when you release the mouse button.
Is there a possibility to convert distance in KM to number of points which can be used on the graphics drawing event?
On Fri, Jul 30, 2021 at 5:41 PM wfletcher @.***> wrote:
Another thing to consider. The SFMap control has functions to select features intersecting a rectangle or circle. Load a shapefile and set it’s RenderSettings.IsSelectable property to true. Then hold the Shift or Ctrl key down and then drag the mouse with the left or right mouse button down. A rectangle/circle will be drawn and features selected when you release the mouse button.
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The circle is a "funny" object. Can not exist in reality as an SHP file. Using Paint to draw something out the scope of SFmap is fine, However, creating a polyline with 360 points works just perfect for me.
