Function calcLineOverlap

test/jasmine/tests/hover_label_test.js:1995–2001

(minA, maxA, minB, maxB)

        }

        function calcLineOverlap(minA, maxA, minB, maxB) {
            expect(minA).toBeLessThan(maxA);
            expect(minB).toBeLessThan(maxB);

            var overlap = Math.min(maxA, maxB) - Math.max(minA, minB);
            return Math.max(0, overlap);
        }

        function labelCount() {
            return d3Select(gd).selectAll('g.hovertext').size();