ChartDirector Ver 4.1 (PHP Edition Edition)

Pattern Area Chart

This example demonstrates using a pattern for filling the area in an area chart, together with a number of chart formatting features.

- Create an XYChart object with background color and border using XYChart.XYChart.
- Set the background color of the title box using Box.setBackground. The background color is a pattern color created using BaseChart.patternColor.
- Enable both vertical and horizontal grid lines using XYChart.setPlotArea. The grid colors are dash line colors created using BaseChart.dashLineColor.
- Create a pattern color with a "snow pattern" loaded from an image file using BaseChart.patternColor2.
- Use DataSet.setDataColor to specify the area fill and border colors. Use the "snow pattern" as the area fill color.
- Use Layer.setLineWidth to increase the border width of the area to highlight it.

Source Code Listing

[File: phpdemo/patternarea.php]

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

    # The data for the area chart
    $data = array(3.0, 2.8, 4.0, 5.5, 7.5, 6.8, 5.4, 6.0, 5.0, 6.2, 7.5, 6.5, 7.5, 8.1,
        6.0, 5.5, 5.3, 3.5, 5.0, 6.6, 5.6, 4.8, 5.2, 6.5, 6.2);

    # The labels for the area chart
    $labels = array("0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12",
        "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24");

    # Create a XYChart object of size 300 x 180 pixels. Set the background to pale yellow
    # (0xffffa0) with a black border (0x0)
    $c = new XYChart(300, 180, 0xffffa0, 0x000000);

    # Set the plotarea at (45, 35) and of size 240 x 120 pixels. Set the background to
    # white (0xffffff). Set both horizontal and vertical grid lines to black (&H0&)
    # dotted lines (pattern code 0x0103)
    $c->setPlotArea(45, 35, 240, 120, 0xffffff, -1, -1, $c->dashLineColor(0x000000,
        0x000103), $c->dashLineColor(0x000000, 0x000103));

    # Add a title to the chart using 10 pts Arial Bold font. Use a 1 x 2 bitmap pattern
    # as the background. Set the border to black (0x0).
    $textBoxObj = $c->addTitle("Snow Percipitation (Dec 12)", "arialbd.ttf", 10);
    $textBoxObj->setBackground($c->patternColor(array(0xb0b0f0, 0xe0e0ff), 2), 0x000000);

    # Add a title to the y axis
    $c->yAxis->setTitle("mm per hour");

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

    # Display 1 out of 3 labels on the x-axis.
    $c->xAxis->setLabelStep(3);

    # Add an area layer to the chart
    $layer = $c->addAreaLayer();

    # Load a snow pattern from an external file "snow.png".
    $snowPattern = $c->patternColor2(dirname(__FILE__)."/snow.png");

    # Add a data set to the area layer using the snow pattern as the fill color. Use deep
    # blue (0x0000ff) as the area border line color (&H0000ff&)
    $dataSetObj = $layer->addDataSet($data);
    $dataSetObj->setDataColor($snowPattern, 0x0000ff);

    # Set the line width to 2 pixels to highlight the line
    $layer->setLineWidth(2);

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

© 2006 Advanced Software Engineering Limited. All rights reserved.