inyaxisex2.php

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

    // Negate all data
    $n = count($ydata);
    for($i=0; $i<$n; ++$i) {
        $ydata[$i] = round(-$ydata[$i]);
    }

    // Basic graph setup
    $graph = new Graph(400,300);
    $graph->SetScale("linlin");
    $graph->img->SetMargin(50,50,60,40);
    $graph->SetMarginColor('darkblue');
    $graph->SetColor('darkblue');
    $graph->SetAxisStyle(AXSTYLE_BOXOUT);
    $graph->SetBackgroundImage("blueblack400x300grad.png",1);
    //$graph->SetBackgroundImage("lightbluedarkblue400x300grad.png",1);

    $graph->title->Set("Depth curve. Dive #2");
    $graph->title->SetFont(FF_FONT1,FS_BOLD);
    $graph->title->SetColor("white");

    $graph->subtitle->Set("(Negated Y-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");

    $lp1 = new LinePlot($ydata);
    $lp1->SetColor("yellow");
    $lp1->SetWeight(2);

    $graph->Add($lp1);
    $graph->Stroke();
    ?>