Create polygonal mask

This function hides a layers, polygons etc. and shows only polygon(s) which you want.
  1. Double click a polygon layer to make it active
  2. Select a polygon(s) in the map (a green circle indicates the selected polygon(s))
  3. Click the Tools button



  1. Select the Create polygonal mask menu item



  1. A window appears with an edit color of polygonal mask
  2. You can change the mask color. Click on the button with 3 circles.



  1. A window appears with colors. Choose a color and click OK.



  1. You can see your color in the little square with RGB representation.
  2. Click OK.



  1. Check result. All layers, polygons etc. are covered by mask color (blue color), excepts the selected polygon(s)



  1. If you do not want the polygonal mask anymore then click the Tools button



  1. Select the Remove polygonal mask menu item



  1. Result. The polygonal mask has been removed