Sanjay Bhangar batpad

## geojson-bonus-types.md

      
        
          
            
              
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                tmcw
                / geojson-bonus-types.md
            
            
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              July 18, 2022 15:14
            
          
        
      
        
  
      
    Bonus geometry types in GeoJSON

Basically two types:

Rectangles
Circles

Let's say you have a drawing tool that permits both. Both geometry types benefit from some non-standard drawing abilities: it would be nice to resize circles, and it would be nice to resize rectangles in a way that keeps them rectangular. However, GeoJSON does not have circle or rectangle types. Both are represented as polygons. This gives us two options:

"Detect" these shapes with a heuristic. This is doable for a rectangle by checking the corners, but much, much less doable for circles. Also, circles have an additional property that I will mention in the next bit.