windrose_ex4.php

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    <?php
    require_once ('jpgraph/jpgraph.php');
    require_once ('jpgraph/jpgraph_windrose.php');

    // Data can be specified using both ordinal index of the axis
    // as well as the direction label
    $data = array(
        0 => array(1,1,2.5,4),
        1 => array(3,4,1,4),
        3 => array(2,7,4,4,3),
        5 => array(2,7,1,2));

    // First create a new windrose graph with a title
    $graph = new WindroseGraph(400,400);

    // Setup title
    $graph->title->Set('Windrose example 4');
    $graph->title->SetFont(FF_VERDANA,FS_BOLD,12);
    $graph->title->SetColor('navy');

    // Create the windrose plot.
    $wp = new WindrosePlot($data);

    // Adjust the font and font color for scale labels
    $wp->scale->SetFont(FF_TIMES,FS_NORMAL,11);
    $wp->scale->SetFontColor('navy');

    // Set the diameter and position for plot
    $wp->SetSize(190);

    // Set the size of the innermost center circle to 40% of the plot size
    // Note that we can have the automatic "Zero" sum appear in our custom text
    $wp->SetZCircleSize(0.38);
    $wp->scale->SetZeroLabel("Station 12\n(Calm %d%%)");

    // Adjust color and font for center circle text
    $wp->scale->SetZFont(FF_ARIAL,FS_NORMAL,9);
    $wp->scale->SetZFontColor('darkgreen');

    // Adjust the font and font color for compass directions
    $wp->SetFont(FF_ARIAL,FS_NORMAL,10);
    $wp->SetFontColor('darkgreen');

    // Adjust the margin to the compass directions
    $wp->SetLabelMargin(50);

    // Adjust grid colors
    $wp->SetGridColor('silver','blue');

    // Add (m/s) text to legend
    $wp->legend->SetText('(m/s)');
    $wp->legend->SetMargin(20,5);

    // Add and send back to client
    $graph->Add($wp);
    $graph->Stroke();
    ?>