impulsex3.php

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

    $numpoints=50;
    $k=0.05;

    // Create some data points
    for($i=0; $i<$numpoints; ++$i) {
        $datay[$i]=exp(-$k*$i)*cos(2*M_PI/10*$i);
    }

    // A format callbakc function
    function mycallback($l) {
        return sprintf("%02.2f",$l);
    }

    // Setup the basic parameters for the graph
    $graph = new Graph(400,200);
    $graph->SetScale("intlin");
    $graph->SetShadow();
    $graph->SetBox();

    $graph->title->Set("Impuls Example 3");
    $graph->title->SetFont(FF_FONT1,FS_BOLD);

    // Set format callback for labels
    $graph->yaxis->SetLabelFormatCallback("mycallback");

    // Set X-axis at the minimum value of Y-axis (default will be at 0)
    $graph->xaxis->SetPos("min");    // "min" will position the x-axis at the minimum value of the Y-axis

    // Extend the margin for the labels on the Y-axis and reverse the direction
    // of the ticks on the Y-axis
    $graph->yaxis->SetLabelMargin(12);
    $graph->xaxis->SetLabelMargin(6);
    $graph->yaxis->SetTickSide(SIDE_LEFT);
    $graph->xaxis->SetTickSide(SIDE_DOWN);

    // Create a new impuls type scatter plot
    $sp1 = new ScatterPlot($datay);
    $sp1->mark->SetType(MARK_SQUARE);
    $sp1->mark->SetFillColor("red");
    $sp1->SetImpuls();
    $sp1->SetColor("blue");
    $sp1->SetWeight(1);
    $sp1->mark->SetWidth(3);

    $graph->Add($sp1);

    $graph->Stroke();

    ?>