ChartDirector 7.0 (PHP Edition)

Heat Map Cell Symbols




This example demonstrates adding symbols and custom legend keys to the discrete heat map.

Source Code Listing

[File: phpdemo/heatmapcellsymbols.php]
<?php require_once("../lib/phpchartdir.php"); # The x-axis and y-axis labels $xLabels = array("Alpha", "Beta", "Gamma", "Delta", "Epsilon", "Zeta", "Eta", "Theta", "Iota", "Kappa"); $yLabels = array("Ant", "Bear", "Cat", "Dog", "Elephant", "Fox", "Goat", "Horse", "Insect", "Jellyfish"); # Random data for the 10 x 10 cells $rand = new RanSeries(2); $zData = $rand->getSeries(count($xLabels) * count($yLabels), 0, 10); # The coordinates for the first set of scatter symbols $symbolX = array(2.5, 6.5, 3.5, 8.5); $symbolY = array(4.5, 7.5, 9.5, 8.5); # The coordinates for the second set of scatter symbols $symbol2X = array(6.5, 3.5, 7.5, 1.5); $symbol2Y = array(0.5, 7.5, 3.5, 2.5); # Create an XYChart object of size 600 x 500 pixels. $c = new XYChart(600, 500); # Set the plotarea at (80, 80) and of size 400 x 400 pixels. Set the background, border, and grid # lines to transparent. $p = $c->setPlotArea(80, 80, 400, 400, -1, -1, Transparent, Transparent); # Add the first set of scatter symbols. Use grey (0x555555) cross shape symbols. $c->addScatterLayer($symbolX, $symbolY, "Disputed", Cross2Shape(0.2), 15, 0x555555 )->setHTMLImageMap("{disable}"); # Add the first set of scatter symbols. Use yellow (0xffff66) star shape symbols. $c->addScatterLayer($symbol2X, $symbol2Y, "Audited", StarShape(5), 19, 0xffff66)->setHTMLImageMap( "{disable}"); # Create a discrete heat map with 10 x 10 cells $layer = $c->addDiscreteHeatMapLayer($zData, count($xLabels)); # Set the x-axis labels. Use 10pt Arial Bold font rotated by 90 degrees. Set axis stem to # transparent, so only the labels are visible. Set 0.5 offset to position the labels in between the # grid lines. Position the x-axis at the top of the chart. $c->xAxis->setLabels($xLabels); $c->xAxis->setLabelStyle("Arial Bold", 10, TextColor, 90); $c->xAxis->setColors(Transparent, TextColor); $c->xAxis->setLabelOffset(0.5); $c->setXAxisOnTop(); # Set the y-axis labels. Use 10pt Arial Bold font. Set axis stem to transparent, so only the labels # are visible. Set 0.5 offset to position the labels in between the grid lines. Reverse the y-axis # so that the labels are flowing top-down instead of bottom-up. $c->yAxis->setLabels($yLabels); $c->yAxis->setLabelStyle("Arial Bold", 10); $c->yAxis->setColors(Transparent, TextColor); $c->yAxis->setLabelOffset(0.5); $c->yAxis->setReverse(); # Set the color stops and scale $colorScale = array(0, 0xff0000, 1, 0xff8800, 3, 0x4488cc, 7, 0x99ccff, 9, 0x00ff00, 10); $colorLabels = array("Poor", "Fair", "Good", "Very Good", "Excellent"); $layer->colorAxis->setColorScale($colorScale); # Position the legend box 20 pixels to the right of the plot area. Use 10pt Arial Bold font. Set the # key icon size to 15 x 15 pixels. Set vertical key spacing to 8 pixels. $b = $c->addLegend($p->getRightX() + 20, $p->getTopY(), true, "Arial Bold", 10); $b->setBackground(Transparent, Transparent); $b->setKeySize(15, 15); $b->setKeySpacing(0, 8); # Add the color scale label to the legend box for($i = count($colorLabels) - 1; $i >= 0; --$i) { $b->addKey($colorLabels[$i], (int)($colorScale[$i * 2 + 1])); } # Output the chart $viewer = new WebChartViewer("chart1"); $viewer->setChart($c, SVG); # Include tool tip for the chart $viewer->setImageMap($c->getHTMLImageMap("", "", "title='<*cdml*>({xLabel}, {yLabel}) = {z|2}'")); ?> <!DOCTYPE html> <html> <head> <title>Heat Map Cell Symbols</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;"> Heat Map Cell Symbols </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>