d3.mouse = function(container) {

return d3_mousePoint(container, d3_eventSource());

};

// https://bugs.webkit.org/show_bug.cgi?id=44083

var d3_mouse_bug44083 = /WebKit/.test(navigator.userAgent) ? -1 : 0;

function d3_mousePoint(container, e) {

var svg = container.ownerSVGElement || container;

if (svg.createSVGPoint) {

var point = svg.createSVGPoint();

if ((d3_mouse_bug44083 < 0) && (window.scrollX || window.scrollY)) {

svg = d3.select(document.body)

.append("svg")

.style("position", "absolute")

.style("top", 0)

.style("left", 0);

var ctm = svg[0][0].getScreenCTM();

d3_mouse_bug44083 = !(ctm.f || ctm.e);

svg.remove();

}

if (d3_mouse_bug44083) {

point.x = e.pageX;

point.y = e.pageY;

} else {

point.x = e.clientX;

point.y = e.clientY;

}

point = point.matrixTransform(container.getScreenCTM().inverse());

return [point.x, point.y];

}

var rect = container.getBoundingClientRect();

return [e.clientX - rect.left - container.clientLeft, e.clientY - rect.top - container.clientTop];

};