ChartDirector 7.0 (Perl Edition)

Scattered Data Contour Chart




This example demonstrates using scattered data to create a ContourLayer.

In the previous Contour Chart example, the data points lie on a grid. ChartDirector also supports using scattered data points, which means the data points can be at irregular positions. To distinguish between the two case, if the number of z coordinates is equal to the product of the number of x and y coordinates, ChartDirector will assume the x and y coordinates define the grid and the z coordinates are values of the points on the grid. If the number of x, y and z coordinates are equal, ChartDirector will assume they represent scatter points.

In this example, in additional to a ContourLayer added using XYChart.addContourLayer, there is also a ScatterLayer added using XYChart.addScatterLayer to show the positions of the data points.

Source Code Listing

perldemo\scattercontour.pl
#!/usr/bin/perl # The ChartDirector for Perl module is assumed to be in "../lib" use File::Basename; use lib (dirname($0)."/../lib") =~ /(.*)/; use perlchartdir; # The (x, y, z) coordinates of the scattered data my $dataX = [0.5, 1.9, 4.9, 1.0, 8.9, 9.8, 5.9, 2.9, 6.8, 9.0, 0.0, 8.9, 1.9, 4.8, 2.4, 3.4, 7.9, 7.5, 4.8, 7.5, 9.5, 0.4, 8.9, 0.9, 5.4, 9.4, 2.9, 8.9, 0.9, 8.9, 10.0, 1.0, 6.8, 3.8, 9.0, 5.3, 6.4, 4.9, 4.5, 2.0, 5.4, 0.0, 10.0, 3.9, 5.4, 5.9, 5.8, 0.3, 4.4, 8.3]; my $dataY = [3.3, 3.0, 0.7, 1.0, 9.3, 4.5, 8.4, 0.1, 0.8, 0.1, 9.3, 1.8, 4.3, 1.3, 2.3, 5.4, 6.9, 9.0, 9.8, 7.5, 1.8, 1.4, 4.5, 7.8, 3.8, 4.0, 2.9, 2.4, 3.9, 2.9, 2.3, 9.3, 2.0, 3.4, 4.8, 2.3, 3.4, 2.3, 1.5, 7.8, 4.5, 0.9, 6.3, 2.4, 6.9, 2.8, 1.3, 2.9, 6.4, 6.3]; my $dataZ = [6.6, 12.5, 7.4, 6.2, 9.6, 13.6, 19.9, 2.2, 6.9, 3.4, 8.7, 8.4, 7.8, 8.0, 9.4, 11.9, 9.6, 15.7, 12.0, 13.3, 9.6, 6.4, 9.0, 6.9, 4.6, 9.7, 10.6, 9.2, 7.0, 6.9, 9.7, 8.6, 8.0, 13.6, 13.2, 5.9, 9.0, 3.2, 8.3, 9.7, 8.2, 6.1, 8.7, 5.6, 14.9, 9.8, 9.3, 5.1, 10.8, 9.8]; # Create a XYChart object of size 450 x 540 pixels my $c = new XYChart(450, 540); # Add a title to the chart using 15 points Arial Italic font $c->addTitle(" Contour Chart with Scattered Data", "Arial Italic", 15); # Set the plotarea at (65, 40) and of size 360 x 360 pixels. Use semi-transparent black (c0000000) # for both horizontal and vertical grid lines $c->setPlotArea(65, 40, 360, 360, -1, -1, -1, 0xc0000000, -1); # Set x-axis and y-axis title using 12 points Arial Bold Italic font $c->xAxis()->setTitle("X-Axis Title Place Holder", "Arial Bold Italic", 10); $c->yAxis()->setTitle("Y-Axis Title Place Holder", "Arial Bold Italic", 10); # Set x-axis and y-axis labels to use Arial Bold font $c->xAxis()->setLabelStyle("Arial Bold"); $c->yAxis()->setLabelStyle("Arial Bold"); # When x-axis and y-axis color to transparent $c->xAxis()->setColors($perlchartdir::Transparent); $c->yAxis()->setColors($perlchartdir::Transparent); # Add a scatter layer to the chart to show the position of the data points. $c->addScatterLayer($dataX, $dataY, "", perlchartdir::Cross2Shape(0.2), 7, 0x000000); # Add a contour layer using the given data my $layer = $c->addContourLayer($dataX, $dataY, $dataZ); # Move the grid lines in front of the contour layer $c->getPlotArea()->moveGridBefore($layer); # Add a color axis (the legend) in which the top center is anchored at (245, 455). Set the length to # 330 pixels and the labels on the top side. my $cAxis = $layer->setColorAxis(245, 455, $perlchartdir::TopCenter, 330, $perlchartdir::Top); # Add a bounding box to the color axis using the default line color as border. $cAxis->setBoundingBox($perlchartdir::Transparent, $perlchartdir::LineColor); # Add a title to the color axis using 12 points Arial Bold Italic font $cAxis->setTitle("Color Legend Title Place Holder", "Arial Bold Italic", 10); # Set color axis labels to use Arial Bold font $cAxis->setLabelStyle("Arial Bold"); # Set the color axis range as 0 to 20, with a step every 2 units $cAxis->setLinearScale(0, 20, 2); # Output the chart $c->makeChart("scattercontour.png");