ChartDirector Ver 5.0 (PHP Edition)

Symbol Line Chart (2)

This example demonstrates using symbols to represent data points and using gradient color for plot area background.

- The gradient plot area background is configured by using BaseChart.linearGradientColor to define the gradient color, then use XYChart.setPlotArea to apply it to the plot area.
- The XYChart.setPlotArea also sets the plot area border and grid line colors to white.
- Use BaseChart.addLegend to add a legend at the top of the chart.
- Use DataSet.setDataSymbol to configure symbols for the data points.
- Set the line width for all lines in the layer using Layer.setLineWidth. (To set the line width for one particular line, use DataSet.setLineWidth.)

Source Code Listing

[File: phpdemo/symbolline2.php]

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

    # The data for the line chart
    $data0 = array(42, 49, 33, 38, 64, 56, 29, 41, 44, 57, 59, 42);
    $data1 = array(65, 75, 47, 34, 42, 49, 73, 62, 90, 69, 66, 78);
    $data2 = array(36, 28, 25, 28, 38, 20, 22, 30, 25, 33, 30, 24);
    $labels = array("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct",
        "Nov", "Dec");

    # Create a XYChart object of size 600 x 375 pixels
    $c = new XYChart(600, 375);

    # Add a title to the chart using 18 pts Times Bold Italic font
    $c->addTitle("Product Line Global Revenue", "timesbi.ttf", 18);

    # Set the plotarea at (50, 55) and of 500 x 280 pixels in size. Use a vertical
    # gradient color from light blue (f9f9ff) to sky blue (aaccff) as background. Set
    # border to transparent and grid lines to white (ffffff).
    $c->setPlotArea(50, 55, 500, 280, $c->linearGradientColor(0, 55, 0, 335, 0xf9fcff,
        0xaaccff), -1, Transparent, 0xffffff);

    # Add a legend box at (50, 28) using horizontal layout. Use 10pts Arial Bold as font,
    # with transparent background.
    $legendObj = $c->addLegend(50, 28, false, "arialbd.ttf", 10);
    $legendObj->setBackground(Transparent);

    # Set the x axis labels
    $c->xAxis->setLabels($labels);

    # Set y-axis tick density to 30 pixels. ChartDirector auto-scaling will use this as
    # the guideline when putting ticks on the y-axis.
    $c->yAxis->setTickDensity(30);

    # Set axis label style to 8pts Arial Bold
    $c->xAxis->setLabelStyle("arialbd.ttf", 8);
    $c->yAxis->setLabelStyle("arialbd.ttf", 8);

    # Set axis line width to 2 pixels
    $c->xAxis->setWidth(2);
    $c->yAxis->setWidth(2);

    # Add axis title using 10pts Arial Bold Italic font
    $c->yAxis->setTitle("Revenue in USD millions", "arialbi.ttf", 10);

    # Add a line layer to the chart
    $layer = $c->addLineLayer2();

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

    # Add the three data sets to the line layer, using circles, diamands and X shapes as
    # symbols
    $dataSetObj = $layer->addDataSet($data0, 0xff0000, "Quantum Computer");
    $dataSetObj->setDataSymbol(CircleSymbol, 9);
    $dataSetObj = $layer->addDataSet($data1, 0x00ff00, "Atom Synthesizer");
    $dataSetObj->setDataSymbol(DiamondSymbol, 11);
    $dataSetObj = $layer->addDataSet($data2, 0xff6600, "Proton Cannon");
    $dataSetObj->setDataSymbol(Cross2Shape(), 11);

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

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