ChartDirector 7.0 (PHP Edition)

Surface Color Scale


      

This example demonstrates using various color scales for surface charts.

ChartDirector supports two ways to configure the color scale:

This example includes 4 charts to demonstrate both of the above methods.

Source Code Listing

[File: phpdemo/surfacecolor.php]
<?php require_once("../lib/phpchartdir.php"); function createChart($viewer, $chartIndex) { # The x and y coordinates of the grid $dataX = array(-4, -3, -2, -1, 0, 1, 2, 3, 4); $dataY = array(-4, -3, -2, -1, 0, 1, 2, 3, 4); # Use random numbers for the z values on the XY grid $r = new RanSeries(99); $dataZ = $r->get2DSeries(count($dataX), count($dataY), -0.9, 0.9); # Create a SurfaceChart object of size 460 x 460 pixels with white (0xffffff) background and # grey (0x888888) border $c = new SurfaceChart(460, 460, 0xffffff, 0x888888); # Set the surface data $c->setData($dataX, $dataY, $dataZ); # Add a color axis (the legend) in at the top center of the chart, with labels at the bottom. # Set the axis to flat style. $cAxis = $c->setColorAxis((int)($c->getWidth() / 2), 15, Top, 250, Bottom); $cAxis->setTitle("Color Axis"); $cAxis->setAxisBorder(Transparent, 0); # By default, the color axis is synchronized with the z-axis. The following code remove the # synchronization so that the color axis will auto-scale independently. Set the auto-scale # minimum tick spacing to 20 pixels. $cAxis->syncAxis(null); $cAxis->setTickDensity(20); if ($chartIndex == 1) { # Speicify a color gradient as a list of colors, and use it in the color axis. $colorGradient = array(0x0044cc, 0xffffff, 0x00aa00); $cAxis->setColorGradient(false, $colorGradient); } else if ($chartIndex == 2) { # Specify the color scale to use in the color axis $colorScale = array(-1.0, 0x1a9850, -0.75, 0x66bd63, -0.5, 0xa6d96a, -0.25, 0xd9ef8b, 0, 0xfee08b, 0.25, 0xfdae61, 0.5, 0xf46d43, 0.75, 0xd73027, 1); $cAxis->setColorScale($colorScale); } else if ($chartIndex == 3) { # Specify the color scale to use in the color axis. Also specify an underflow color 0x66ccff # (blue) for regions that fall below the lower axis limit. $colorScale = array(0, 0xffff99, 0.2, 0x80cdc1, 0.4, 0x35978f, 0.6, 0x01665e, 0.8, 0x003c30, 1); $cAxis->setColorScale($colorScale, 0x66ccff); } # Set the center of the plot region at (230, 250), and set width x depth x height to 240 x 240 x # 170 pixels $c->setPlotRegion(230, 250, 240, 240, 170); # Set the plot region wall thichness to 3 pixels $c->setWallThickness(3); # Set the elevation and rotation angles to 45 degrees $c->setViewAngle(45, 45); # Set the perspective level to 20 $c->setPerspective(20); # Spline interpolate data to a 50 x 50 grid for a smooth surface $c->setInterpolation(50, 50); # Set the axis title $c->xAxis->setTitle("X-Axis", "Arial Bold", 10); $c->yAxis->setTitle("Y-Axis", "Arial Bold", 10); $c->zAxis->setTitle("Z Axis", "Arial Bold", 10); # Output the chart $viewer->setChart($c, SVG); } # This example includes 4 charts $viewers = array(); for ($i = 0; $i < 4; ++$i) { $viewers[$i] = new WebChartViewer("chart$i"); createChart($viewers[$i], $i); } ?> <!DOCTYPE html> <html> <head> <title>Surface Color Scale</title> <!-- Include ChartDirector Javascript Library to support chart interactions --> <script type="text/javascript" src="cdjcv.js"></script> </head> <body style="margin:5px 0px 0px 5px"> <div style="font:bold 18pt verdana;"> Surface Color Scale </div> <hr style="border:solid 1px #000080; background:#000080" /> <div style="font:10pt verdana; margin-bottom:1.5em"> <a href="viewsource.php?file=<?=basename(__FILE__)?>">View Chart Source Code</a> </div> <!-- ****** Here are the chart images ****** --> <?php for ($i = 0; $i < count($viewers); ++$i) { echo $viewers[$i]->renderHTML(), " "; } ?> </body> </html>