This is an old question, but since I had the same problem and solved it, I am posting this answer as a future reference.
My problem was in the order of the called methods. You MUST call Show after adding the schedule to the schedule. As an example:
$graph = new \Graph($width, $height); [... init graph ...] $plot = new \BarPlot($datay); $graph->Add($plot); $plot->value->Show(); $plot->value->SetColor("black","darkred"); $plot->value->SetFormat('%01.2f');
I hope this helps someone.
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