ChartDirector 7.0 (PHP Edition)

Continuous Contour Coloring




This example demonstrates continuous coloring of the ContourLayer.

By default, a contour layer will be discretely colored, which means the color will change in discrete steps according to the z level. In continuous coloring, the color will change continuously according to the z level. Continuous coloring can be enabled using ColorAxis.setColorGradient or ColorAxis.setColorScale.

Source Code Listing

[File: phpdemo/smoothcontour.php]
<?php require_once("../lib/phpchartdir.php"); # The x and y coordinates of the grid $dataX = array(-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10); $dataY = array(-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10); # The values at the grid points. In this example, we will compute the values using the formula z = # Sin(x / 2) * Sin(y / 2). $dataZ = array_fill(0, count($dataX) * count($dataY), 0); for($yIndex = 0; $yIndex < count($dataY); ++$yIndex) { $y = $dataY[$yIndex]; for($xIndex = 0; $xIndex < count($dataX); ++$xIndex) { $x = $dataX[$xIndex]; $dataZ[$yIndex * count($dataX) + $xIndex] = sin($x / 2.0) * sin($y / 2.0); } } # Create a XYChart object of size 600 x 500 pixels $c = new XYChart(600, 500); # Add a title to the chart using 18 points Times New Roman Bold Italic font $c->addTitle("Nano Lattice Twister Field Intensity ", "Times New Roman Bold Italic", 18); # Set the plotarea at (75, 40) and of size 400 x 400 pixels. Use semi-transparent black (80000000) # dotted lines for both horizontal and vertical grid lines $c->setPlotArea(75, 40, 400, 400, -1, -1, -1, $c->dashLineColor(0x80000000, DotLine), -1); # Set x-axis and y-axis title using 12 points Arial Bold Italic font $c->xAxis->setTitle("Lattice X Direction (nm)", "Arial Bold Italic", 12); $c->yAxis->setTitle("Lattice Y Direction (nm)", "Arial Bold Italic", 12); # Set x-axis and y-axis labels to use Arial Bold font $c->xAxis->setLabelStyle("Arial Bold"); $c->yAxis->setLabelStyle("Arial Bold"); # When auto-scaling, use tick spacing of 40 pixels as a guideline $c->yAxis->setTickDensity(40); $c->xAxis->setTickDensity(40); # Add a contour layer using the given data $layer = $c->addContourLayer($dataX, $dataY, $dataZ); # Set the contour color to transparent $layer->setContourColor(Transparent); # Move the grid lines in front of the contour layer $c->getPlotArea()->moveGridBefore($layer); # Add a color axis (the legend) in which the left center point is anchored at (495, 240). Set the # length to 370 pixels and the labels on the right side. $cAxis = $layer->setColorAxis(495, 240, Left, 370, Right); # Add a bounding box to the color axis using light grey (eeeeee) as the background and dark grey # (444444) as the border. $cAxis->setBoundingBox(0xeeeeee, 0x444444); # Add a title to the color axis using 12 points Arial Bold Italic font $cAxis->setTitle("Twist Pressure (Twist-Volt)", "Arial Bold Italic", 12); # Set color axis labels to use Arial Bold font $cAxis->setLabelStyle("Arial Bold"); # Use smooth gradient coloring $cAxis->setColorGradient(true); # Output the chart $viewer = new WebChartViewer("chart1"); $viewer->setChart($c, SVG); # Include tool tip for the chart $viewer->setImageMap($c->getHTMLImageMap("", "", "title='<*cdml*>X: {x|2}<*br*>Y: {y|2}<*br*>Z: {z|2}'")); # Output Javascript chart model to support contour chart tooltips $viewer->setChartModel($c->getJsChartModel()); ?> <!DOCTYPE html> <html> <head> <title>Continuous Contour 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;"> Continuous Contour 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>