jpgraph demo

<?php // content="text/plain; charset=utf-8"
require_once ('jpgraph/jpgraph.php');
require_once ('jpgraph/jpgraph_line.php');

function scaleNumber($val, $in_min, $in_max, $out_min, $out_max) {
  return intval(($val - $in_min) * ($out_max - $out_min) / ($in_max - $in_min) + $out_min);
}

$l1datay = [];
$datax = [];
$maxData = 266;

for($i = 0; $i <= $maxData; ++$i) {
  // demodaten erzeugen
  $l1datay[] = $i % 35 == 0 ? rand(0, 200) : rand(10,100);
  // label erzeugen und auf interval [0,25] runterrechnen.
  $datax[] = scaleNumber($i, 0, $maxData, 0, 24);
}
$l1datay[$maxData] = 200; // letzten Datenpunkt als Ausreißer um zu sehen ob er noch im Bild ist

// Create the graph.
$graph = new Graph(800,400);
$graph->clearTheme();
$graph->SetScale("textlin");

// Label nur alle /24 anzeigen
$graph->xaxis->SetTextLabelInterval(266/24);
// Label array setzen
$graph->xaxis->SetTickLabels($datax);

// Create the linear error plot
$l1plot=new LinePlot($l1datay);
$l1plot->SetColor("red");
$l1plot->SetWeight(2);
$l1plot->SetLegend("Prediction");

//Center the line plot in the center of the bars
$l1plot->SetBarCenter();

// Add the plots to t'he graph
$graph->Add($l1plot);

$graph->title->Set("Linie");
$graph->xaxis->title->Set("X-title");
$graph->yaxis->title->Set("Y-title");

$graph->title->SetFont(FF_FONT1,FS_BOLD);
$graph->yaxis->title->SetFont(FF_FONT1,FS_BOLD);
$graph->xaxis->title->SetFont(FF_FONT1,FS_BOLD);

// Display the graph
$graph->Stroke();