Surface Chart (3)

perldemo\surface3.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 and y coordinates of the grid
my $dataX = [-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
my $dataY = [-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 * x / 128 - y * y / 256 + 3) * Cos(x / 4 + 1 - Exp(y / 8))
my $dataZ = [(0) x (scalar(@$dataX) * scalar(@$dataY))];
for(my $yIndex = 0; $yIndex < scalar(@$dataY); ++$yIndex) {
    my $y = $dataY->[$yIndex];
    for(my $xIndex = 0; $xIndex < scalar(@$dataX); ++$xIndex) {
        my $x = $dataX->[$xIndex];
        $dataZ->[$yIndex * scalar(@$dataX) + $xIndex] = sin($x * $x / 128.0 - $y * $y / 256.0 + 3) *
            cos($x / 4.0 + 1 - exp($y / 8.0));
    }
}

# Create a SurfaceChart object of size 750 x 600 pixels
my $c = new SurfaceChart(750, 600);

# Add a title to the chart using 20 points Times New Roman Italic font
$c->addTitle("Surface Energy Density       ", "Times New Roman Italic", 20);

# Set the center of the plot region at (380, 260), and set width x depth x height to 360 x 360 x 270
# pixels
$c->setPlotRegion(380, 260, 360, 360, 270);

# Set the elevation and rotation angles to 30 and 210 degrees
$c->setViewAngle(30, 210);

# Set the perspective level to 60
$c->setPerspective(60);

# Set the data to use to plot the chart
$c->setData($dataX, $dataY, $dataZ);

# Spline interpolate data to a 80 x 80 grid for a smooth surface
$c->setInterpolation(80, 80);

# Use semi-transparent black (c0000000) for x and y major surface grid lines. Use dotted style for x
# and y minor surface grid lines.
my $majorGridColor = 0xc0000000;
my $minorGridColor = $c->dashLineColor($majorGridColor, $perlchartdir::DotLine);
$c->setSurfaceAxisGrid($majorGridColor, $majorGridColor, $minorGridColor, $minorGridColor);

# Set contour lines to semi-transparent white (80ffffff)
$c->setContourColor(0x80ffffff);

# Add a color axis (the legend) in which the left center is anchored at (665, 280). Set the length
# to 200 pixels and the labels on the right side.
$c->setColorAxis(665, 280, $perlchartdir::Left, 200, $perlchartdir::Right);

# Set the x, y and z axis titles using 12 points Arial Bold font
$c->xAxis()->setTitle("X Title\nPlaceholder", "Arial Bold", 12);
$c->yAxis()->setTitle("Y Title\nPlaceholder", "Arial Bold", 12);
$c->zAxis()->setTitle("Z Title Placeholder", "Arial Bold", 12);

# Output the chart
$c->makeChart("surface3.jpg");