ChartDirector Ver 5.0 (PHP Edition)

Arbitrary XY Line Chart

This example demonstrates drawing a line chart with arbitrary x coordinates (not increasing or decreasing in one direction), and adding custom data labels to data points.
The x values of the data points are set into the chart using Layer.setXData. ChartDirector merely joins the points together with lines. It does not require the points to following any particular direction.
Note that this example has special labels for the start and end points of the lines. They are created using Layer.addCustomDataLabel.

Source Code Listing

[File: phpdemo/xyline.php]

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

    # The (x, y) data for the first line
    $dataX0 = array(20, 90, 40, 30, 12);
    $dataY0 = array(10, 40, 75, 54, 20);

    # The (x, y) data for the second line
    $dataX1 = array(10, 40, 75, 54, 60);
    $dataY1 = array(50, 90, 40, 30, 10);

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

    # Set the plotarea at (55, 65) and of size 350 x 300 pixels, with white background
    # and a light grey border (0xc0c0c0). Turn on both horizontal and vertical grid lines
    # with light grey color (0xc0c0c0)
    $c->setPlotArea(55, 65, 350, 300, 0xffffff, -1, 0xc0c0c0, 0xc0c0c0, -1);

    # Add a legend box at (50, 30) (top of the chart) with horizontal layout. Use 12 pts
    # Times Bold Italic font. Set the background and border color to Transparent.
    $legendObj = $c->addLegend(50, 30, false, "timesbi.ttf", 12);
    $legendObj->setBackground(Transparent);

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

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

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

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

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

    # Add a red (0xff3333) line layer using dataX0 and dataY0
    $layer1 = $c->addLineLayer($dataY0, 0xff3333, "Compound AAA");
    $layer1->setXData($dataX0);

    # Set the line width to 3 pixels
    $layer1->setLineWidth(3);

    # Use 9 pixel square symbols for the data points
    $dataSetObj = $layer1->getDataSet(0);
    $dataSetObj->setDataSymbol(SquareSymbol, 9);

    # Add custom text labels to the first and last point on the scatter plot using Arial
    # Bold font
    $layer1->addCustomDataLabel(0, 0, "Start", "arialbd.ttf");
    $layer1->addCustomDataLabel(0, 4, "End", "arialbd.ttf");

    # Add a green (0x33ff33) line layer using dataX1 and dataY1
    $layer2 = $c->addLineLayer($dataY1, 0x33ff33, "Compound BBB");
    $layer2->setXData($dataX1);

    # Set the line width to 3 pixels
    $layer2->setLineWidth(3);

    # Use 11 pixel diamond symbols for the data points
    $dataSetObj = $layer2->getDataSet(0);
    $dataSetObj->setDataSymbol(DiamondSymbol, 11);

    # Add custom text labels to the first and last point on the scatter plot using Arial
    # Bold font
    $layer2->addCustomDataLabel(0, 0, "Start", "arialbd.ttf");
    $layer2->addCustomDataLabel(0, 4, "End", "arialbd.ttf");

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

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