[Sommaire] [Imprimer]

   1  <?php
   2  include  ("../jpgraph.php");
   3  include  ("../jpgraph_line.php");
   4  
   5  // Callback to negate the argument
   6  function _cb_negate($aVal) {
   7      return round(-$aVal);
   8  }
   9  
  10  // A fake depth curve
  11  $ydata = array(0,1,4,5,8,9,10,14,16,16,16,18,20,20,20,22,22.5,22,19,19,15,15,15,15,10,10,10,6,5,5,5,4,4,2,1,0);
  12  
  13  $n = count($ydata);
  14  $y2data = array();
  15  for( $i=0; $i< $n; ++$i ) {
  16      $y2data[] = $ydata[$i]+10;
  17  }
  18  
  19  // Negate all data
  20  $n = count($ydata);
  21  for($i=0; $i<$n; ++$i) {
  22      $ydata[$i] = round(-$ydata[$i]);
  23      $y2data[$i] = round(-$y2data[$i]);
  24  }
  25  
  26  // Basic graph setup
  27  $graph = new Graph(400,300,"auto");
  28  $graph->SetScale("linlin");
  29  $graph->SetY2Scale("lin");
  30  $graph->SetMargin(50,50,60,40);    
  31  $graph->SetMarginColor('darkblue');
  32  $graph->SetColor('darkblue');
  33  
  34  // Setup titles
  35  $graph->title->Set("Inverting both Y-axis");
  36  $graph->title->SetFont(FF_FONT1,FS_BOLD);
  37  $graph->title->SetColor("white");
  38  
  39  $graph->subtitle->Set("(Negated Y & Y2 axis)");
  40  $graph->subtitle->SetFont(FF_FONT1,FS_NORMAL);
  41  $graph->subtitle->SetColor("white");
  42  
  43  // Setup axis
  44  $graph->yaxis->SetLabelFormatCallback("_cb_negate");
  45  $graph->xaxis->SetColor("lightblue","white");
  46  $graph->yaxis->SetColor("lightblue","white");
  47  $graph->ygrid->SetColor("blue");
  48  
  49  // Setup Y2 axis
  50  $graph->y2axis->SetLabelFormatCallback("_cb_negate");
  51  $graph->y2axis->SetColor("darkred","white");
  52  $graph->y2scale->SetAutoMax(0); // To make sure it starts with 0
  53  
  54  // Setup plot 1
  55  $lp1 = new LinePlot($ydata);
  56  $lp1->SetColor("yellow");
  57  $lp1->SetWeight(2);
  58  $graph->Add($lp1);
  59  
  60  // Setup plot 2
  61  $lp2 = new LinePlot($y2data);
  62  $lp2->SetColor("darkred");
  63  $lp2->SetWeight(2);
  64  $graph->AddY2($lp2);
  65  
  66  $graph->Stroke();
  67  ?>
  68  
  69