ChartDirector 7.0 (PHP Edition)

X Zone Coloring




This example demonstrates using x zone colors - colors that change at certain x value thresholds.

In this example, a x zone colors are used as the color of the line, and as the fill color of the band surrounding the line.

The x zone color for the line is configured to change from solid blue color to a red dash line color upon reaching a certain x value threshold. The x zone color for the band is configured to change from semi-transparent blue to semi-transparent red upon reaching the same threshold.

X zone colors are created using Layer.xZoneColor. You can use a x zone color in any ChartDirector API that expects a color. For instance, you can use a x zone color as background color, fill color of data sets, line color, etc.

A single x zone color can support one threshold value and change between two colors. The two colors can be any colors, including another x zone color. You may create x zone colors with multiple thresholds by cascading multiple x zone colors this way.

Source Code Listing

[File: phpdemo/xzonecolor.php]
<?php require_once("../lib/phpchartdir.php"); # The data for the chart $data = array(50, 55, 47, 34, 42, 49, 63, 62, 73, 59, 56, 50, 64, 60, 67, 67, 58, 59, 73, 77, 84, 82, 80, 84, 89); # The error data representing the error band around the data points $errData = array(5, 6, 5.1, 6.5, 6.6, 8, 5.4, 5.1, 4.6, 5.0, 5.2, 6.0, 4.9, 5.6, 4.8, 6.2, 7.4, 7.1, 6.5, 9.6, 12.1, 15.3, 18.5, 20.9, 24.1); # The timestamps for the data $labels = array(chartTime(2001, 1, 1), chartTime(2001, 2, 1), chartTime(2001, 3, 1), chartTime(2001, 4, 1), chartTime(2001, 5, 1), chartTime(2001, 6, 1), chartTime(2001, 7, 1), chartTime(2001, 8, 1 ), chartTime(2001, 9, 1), chartTime(2001, 10, 1), chartTime(2001, 11, 1), chartTime(2001, 12, 1 ), chartTime(2002, 1, 1), chartTime(2002, 2, 1), chartTime(2002, 3, 1), chartTime(2002, 4, 1), chartTime(2002, 5, 1), chartTime(2002, 6, 1), chartTime(2002, 7, 1), chartTime(2002, 8, 1), chartTime(2002, 9, 1), chartTime(2002, 10, 1), chartTime(2002, 11, 1), chartTime(2002, 12, 1), chartTime(2003, 1, 1)); # Create a XYChart object of size 550 x 220 pixels $c = new XYChart(550, 220); # Set the plot area at (50, 10) and of size 480 x 180 pixels. Enabled both vertical and horizontal # grids by setting their colors to light grey (cccccc) $c->setPlotArea(50, 10, 480, 180)->setGridColor(0xcccccc, 0xcccccc); # Add a legend box (50, 10) (top of plot area) using horizontal layout. Use 8pt Arial font. Disable # bounding box (set border to transparent). $legendBox = $c->addLegend(50, 10, false, "", 8); $legendBox->setBackground(Transparent); # Add keys to the legend box to explain the color zones $legendBox->addKey("Historical", 0x9999ff); $legendBox->addKey("Forecast", 0xff9966); # Add a title to the y axis. $c->yAxis->setTitle("Energy Consumption"); # Set the labels on the x axis $c->xAxis->setLabels2($labels); # Set multi-style axis label formatting. Use Arial Bold font for yearly labels and display them as # "yyyy". Use default font for monthly labels and display them as "mmm". Replace some labels with # minor ticks to ensure the labels are at least 3 units apart. $c->xAxis->setMultiFormat(StartOfYearFilter(), "<*font=Arial Bold*>{value|yyyy}", StartOfMonthFilter(), "{value|mmm}", 3); # Add a line layer to the chart $layer = $c->addLineLayer2(); # Create the color to draw the data line. The line is blue (0x333399) to the left of x = 18, and # become a red (0xd04040) dash line to the right of x = 18. $lineColor = $layer->xZoneColor(18, 0x333399, $c->dashLineColor(0xd04040, DashLine)); # Add the data line $layer->addDataSet($data, $lineColor, "Average"); # We are not showing the data set name in the legend box. The name is for showing in tool tips only. $layer->setLegend(NoLegend); # Create the color to draw the err zone. The color is semi-transparent blue (0x809999ff) to the left # of x = 18, and become semi-transparent red (0x80ff9966) to the right of x = 18. $errColor = $layer->xZoneColor(18, 0x809999ff, 0x80ff9966); # Add the upper border of the err zone $upperBorder = new ArrayMath($data); $upperBorder->add($errData); $layer->addDataSet($upperBorder->result(), $errColor, "Upper bound"); # Add the lower border of the err zone $lowerBorder = new ArrayMath($data); $lowerBorder->sub($errData); $layer->addDataSet($lowerBorder->result(), $errColor, "Lower bound"); # Set the default line width to 2 pixels $layer->setLineWidth(2); # In this example, we are not showing the data set name in the legend box $layer->setLegend(NoLegend); # Color the region between the err zone lines $c->addInterLineLayer($layer->getLine(1), $layer->getLine(2), $errColor); # Output the chart $viewer = new WebChartViewer("chart1"); $viewer->setChart($c, SVG); # Include tool tip for the chart. $viewer->setImageMap($c->getHTMLImageMap("", "", "title='{dataSetName} on {xLabel|mmm yyyy}: {value} MJoule'")); ?> <!DOCTYPE html> <html> <head> <title>X Zone Coloring</title> <!-- Include ChartDirector Javascript Library to support chart interactions --> <script type="text/javascript" src="cdjcv.js"></script> </head> <body style="margin:5px 0px 0px 5px"> <div style="font:bold 18pt verdana;"> X Zone Coloring </div> <hr style="border:solid 1px #000080; background:#000080" /> <div style="font:10pt verdana; margin-bottom:1.5em"> <a href="viewsource.php?file=<?=basename(__FILE__)?>">View Chart Source Code</a> </div> <!-- ****** Here is the chart image ****** --> <?php echo $viewer->renderHTML(); ?> </body> </html>