function drawTooltip(){
            tooltipTextContainer = svg.selectAll('.tooltip-group')
                .append('g')
                .classed('tooltip-text select-disable', true);

            tooltipBackground = tooltipTextContainer
              .append('rect')
                .classed('tooltip-background', true)
                .attr('width', width)
                .attr('height', height)
                .attr('rx', backgroundBorderRadius)
                .attr('ry', backgroundBorderRadius)
                .attr('y', - margin.top)
                .attr('x', - margin.left)
                .style('fill', bodyFillColor)
                .style('stroke', borderStrokeColor)
                .style('stroke-width', 1)
                .style('pointer-events', 'none')
                .style('opacity', 0.9);
        }
Draws the different elements of the Tooltip box
@return void