ChartDirector Ver 5.0 (PHP Edition)

Vector Chart

This example demonstrates a vector chart.
A vector chart is like a scatter chart, but the symbols are arrows which can be of arbitrary lengths pointing to arbitrary directions. Thus each symbol in a vector chart is specified by 4 values - the x and y coordinates, the length and the direction.
In ChartDirector, an XY vector layer is created using XYChart.addVectorLayer.

Source Code Listing

[File: phpdemo/vector.php]

    <?php
    require_once("../lib/phpchartdir.php");

    # The (x, y) coordinates of the starting point of the vectors
    $dataX = array(20, 40, 60, 80, 100, 20, 40, 60, 80, 100, 20, 40, 58, 62, 80, 100, 20,
        40, 60, 80, 100, 20, 40, 60, 80, 100);
    $dataY = array(20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 60, 60, 60, 60, 60, 60, 80,
        80, 80, 80, 80, 100, 100, 100, 100, 100);

    # The lengths (radii) and directions (angles) of the vectors
    $dataR = array(6, 6, 9, 6, 6, 6, 9, 12, 9, 6, 9, 12, 12, 12, 12, 9, 6, 9, 12, 9, 6,
        6, 6, 9, 6, 6);
    $dataA = array(-45, -30, 0, 30, 45, -60, -45, 0, 45, 60, -90, -90, -90, 90, 90, 90,
        -120, -135, 180, 135, 120, -135, -150, 180, 150, 135);

    # Create a XYChart object of size 450 x 390 pixels
    $c = new XYChart(450, 390);

    # Set the plotarea at (55, 40) and of size 350 x 300 pixels, with a light grey border
    # (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color
    # (0xc0c0c0)
    $c->setPlotArea(55, 40, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1);

    # Add a title to the chart using 18 pts Times Bold Itatic font.
    $c->addTitle("Vector Chart Demonstration", "timesbi.ttf", 18);

    # Add a title to the y axis using 12 pts Arial Bold Italic font
    $c->yAxis->setTitle("Y Axis Title", "arialbi.ttf", 12);

    # Add a title to the x axis using 12 pts Arial Bold Italic font
    $c->xAxis->setTitle("X Axis Title", "arialbi.ttf", 12);

    # Set the axes line width to 3 pixels
    $c->xAxis->setWidth(3);
    $c->yAxis->setWidth(3);

    # Add a vector layer to the chart using blue (0000CC) color, with vector arrow size
    # set to 11 pixels
    $vectorLayerObj = $c->addVectorLayer($dataX, $dataY, $dataR, $dataA, YAxisScale,
        0x0000cc);
    $vectorLayerObj->setArrowHead(11);

    # Output the chart
    header("Content-type: image/png");
    print($c->makeChart2(PNG));
    ?>

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