SetDrawXDataLabelLines — Draw data lines
$plot->SetDrawXDataLabelLines($dxdl
)
SetDrawXDataLabelLines
enables drawing of data label
lines from the X axis up to the data point. To use data label lines, you
generally want to turn off ticks, tick labels, and X grid.
Data label lines only work with these plot types: lines, points, linepoints, and thinbarline. Data label lines don't work with these plot types: pie, area, squared, bars, and stackedbars, because the data label line would be covered or obscured by the data.
By default, data label lines are not drawn.