| <?php |
| include ("../jpgraph.php"); |
| include ("../jpgraph_line.php"); |
| |
| // Callback to negate the argument |
| function _cb_negate($aVal) { |
| return round(-$aVal); |
| } |
| |
| // A fake depth curve |
| $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); |
| |
| $n = count($ydata); |
| $y2data = array(); |
| for( $i=0; $i< $n; ++$i ) { |
| $y2data[] = $ydata[$i]+10; |
| } |
| |
| // Negate all data |
| $n = count($ydata); |
| for($i=0; $i<$n; ++$i) { |
| $ydata[$i] = round(-$ydata[$i]); |
| $y2data[$i] = round(-$y2data[$i]); |
| } |
| |
| // Basic graph setup |
| $graph = new Graph(400,300,"auto"); |
| $graph->SetScale("linlin"); |
| $graph->SetY2Scale("lin"); |
| $graph->SetMargin(50,50,60,40); |
| $graph->SetMarginColor('darkblue'); |
| $graph->SetColor('darkblue'); |
| |
| // Setup titles |
| $graph->title->Set("Inverting both Y-axis"); |
| $graph->title->SetFont(FF_FONT1,FS_BOLD); |
| $graph->title->SetColor("white"); |
| |
| $graph->subtitle->Set("(Negated Y & Y2 axis)"); |
| $graph->subtitle->SetFont(FF_FONT1,FS_NORMAL); |
| $graph->subtitle->SetColor("white"); |
| |
| // Setup axis |
| $graph->yaxis->SetLabelFormatCallback("_cb_negate"); |
| $graph->xaxis->SetColor("lightblue","white"); |
| $graph->yaxis->SetColor("lightblue","white"); |
| $graph->ygrid->SetColor("blue"); |
| |
| // Setup Y2 axis |
| $graph->y2axis->SetLabelFormatCallback("_cb_negate"); |
| $graph->y2axis->SetColor("darkred","white"); |
| $graph->y2scale->SetAutoMax(0); // To make sure it starts with 0 |
| |
| // Setup plot 1 |
| $lp1 = new LinePlot($ydata); |
| $lp1->SetColor("yellow"); |
| $lp1->SetWeight(2); |
| $graph->Add($lp1); |
| |
| // Setup plot 2 |
| $lp2 = new LinePlot($y2data); |
| $lp2->SetColor("darkred"); |
| $lp2->SetWeight(2); |
| $graph->AddY2($lp2); |
| |
| $graph->Stroke(); |
| ?> |
| |
| |