Function findPolygonOffset

src/plots/polar/helpers.js:178–189

(r, a0, a1, vangles)

}

function findPolygonOffset(r, a0, a1, vangles) {
    var minX = Infinity;
    var minY = Infinity;
    var vertices = makePolygon(r, a0, a1, vangles);

    for(var i = 0; i < vertices.length; i++) {
        var v = vertices[i];
        minX = Math.min(minX, v[0]);
        minY = Math.min(minY, -v[1]);
    }
    return [minX, minY];
}

/**
 * find vertex angles (in 'vangles') the enclose angle 'a'