Function getSubtract

src/components/selections/select.js:1447–1461

(polygon, previousPolygons)

}

function getSubtract(polygon, previousPolygons) {
    var subtract = false;
    for(var i = 0; i < previousPolygons.length; i++) {
        var previousPolygon = previousPolygons[i];

        // find out if a point of polygon is inside previous polygons
        for(var k = 0; k < polygon.length; k++) {
            if(pointInPolygon(polygon[k], previousPolygon)) {
                subtract = !subtract;
                break;
            }
        }
    }
    return subtract;
}

function convert(ax, d) {
    if(ax.type === 'date') d = d.replace('_', ' ');