Fixing positioning of optional mousemove tooltip

Author: zeroviscosity

step-5-adding-tooltips.html

@@ -108,8 +108,8 @@
 
           /* OPTIONAL 
           path.on('mousemove', function(d) {                            // NEW
-            tooltip.style('top', (d3.event.pageY + 10) + 'px')          // NEW
-              .style('left', (d3.event.pageX + 10) + 'px');             // NEW
+            tooltip.style('top', (d3.event.layerY + 10) + 'px')         // NEW
+              .style('left', (d3.event.layerX + 10) + 'px');            // NEW
           });                                                           // NEW
           */
 

step-6-animating-interactivity.html

@@ -120,8 +120,8 @@ <h1>Toronto Parking Tickets by Weekday in 2012</h1>             <!-- NEW -->
 
           /* OPTIONAL 
           path.on('mousemove', function(d) {
-            tooltip.style('top', (d3.event.pageY + 10) + 'px')
-              .style('left', (d3.event.pageX + 10) + 'px');
+            tooltip.style('top', (d3.event.layerY + 10) + 'px')
+              .style('left', (d3.event.layerX + 10) + 'px');
           });
           */