src/charts/stacked-area.js
/**
         * Draws an overlay element over the graph
         * @private
         */
Draws an overlay element over the graph
@private
Draws an overlay element over the graph @private
function drawHoverOverlay(){
            overlay = svg.select('.metadata-group')
                .append('rect')
                .attr('class', 'overlay')
                .attr('y1', 0)
                .attr('y2', chartHeight)
                .attr('height', chartHeight)
                .attr('width', chartWidth)
                .attr('fill', 'rgba(0,0,0,0)')
                .style('display', 'none');
        }
function drawHoverOverlay ( ) { overlay = svg . select ( '.metadata-group' ) . append ( 'rect' ) . attr ( 'class' , 'overlay' ) . attr ( 'y1' , 0 ) . attr ( 'y2' , chartHeight ) . attr ( 'height' , chartHeight ) . attr ( 'width' , chartWidth ) . attr ( 'fill' , 'rgba(0,0,0,0)' ) . style ( 'display' , 'none' ) ; }
Draws an overlay element over the graph
 @private
Draws an overlay element over the graph @private