Add starting radius to circle and sector

[LamprosPitsillos]

Having Circle and Sector accept an option like "initRadius" , where the circle or sector will start after that radius.

This can be easily done internally with the Misc.mask

Why to achieve something like a torus for circles and sectors really easily and conveniently

[LamprosPitsillos]

var radius = 5;
var bearing1 = 25;
var bearing2 = 45;


var A_center = turf.point([-75, 40]);
var B_center = turf.point([-75.02, 40.01]);

var A_sector = turf.sector(A_center, radius, bearing1, bearing2);
var A_sector_mask = turf.sector(A_center, radius-2, bearing1, bearing2);


var x = turf.difference(turf.featureCollection([A_sector, A_sector_mask]));

var B_sector = turf.sector(B_center, radius, bearing1, bearing2);
var B_sector_mask = turf.sector(B_center, radius-2, bearing1, bearing2);

const y = turf.mask(B_sector, B_sector_mask);
return turf.featureCollection([x,y]);

Turns out i cant achieve what i want using mask ( documented behavior ) "Returns Masked Polygon (exterior ring with holes)"
Nor using the turf difference, am i doing something wrong?

[smallsaucepan]

Hi @LamprosPitsillos. Is your issue the narrow sections running back to the center of your circle? If so, that might be because (due to some precision issues) your sector mask is slightly narrower than your sector when you call difference.

Instead, I would suggest making your mask the full circle. That way it will correctly chop off those lines as well:

// var A_sector_mask = turf.sector(A_center, radius-2, bearing1, bearing2);
var A_circle_mask = turf.circle(A_center, radius-2);

// var x = turf.difference(turf.featureCollection([A_sector, A_sector_mask]));
var x = turf.difference(turf.featureCollection([A_sector, A_circle_mask]));

Let us know if that helps!