openlayers 3 - Show area cover based on lineString -


what trying display area covered someone. example search team walks through field, person see 50m either way. want display polygon width of 100m , length of path has been walked. need both display graphically , in area measurement.

the best idea have implement create line string , create polygon somehow setting points 90 degrees line of point point b. this:

         |                 |          |                 | point  +-----------------+ point b          |                 |          |                 |

however, have no idea how angle line in order find coordinates create polygon. know of way this?

i found solution eventually. need use ol.geom.polygon.fromcircle. if set number of points 2 give horizontal line can rotate heading direction.

var thecircle = new ol.geom.circle(themarker.getcoordinates(), radius); var polycircle = new ol.geom.polygon.fromcircle(thecircle, 2, heading); var polycirclecoords = polycircle.getcoordinates();

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