Surface Chart (2)

This example extends the Surface Chart (1) example by adding surface grid and contour lines, and using alternative view angles and continuous coloring.

The alternative view angles are set using ThreeDChart.setViewAngle.
The surface grid lines are added using SurfaceChart.setSurfaceAxisGrid.
The contour lines are added using SurfaceChart.setContourColor.
Note that for both the surface grid and contour lines, semi-transparent line colors are used to make the lines look thin and light.
Continuous coloring are configured using ColorAxis.setColorGradient.

[File: phpdemo/surface2.php]

<?php
require_once("../lib/phpchartdir.php");

# The x and y coordinates of the grid
$dataX = array(0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0);
$dataY = array(0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0);

# The values at the grid points. In this example, we will compute the values using
# the formula z = sin((x - 0.5) * 2 * pi) * sin((y - 0.5) * 2 * pi)
$dataZ = array_pad(array(), count($dataX) * count($dataY), 0);
for($yIndex = 0; $yIndex < count($dataY); ++$yIndex) {
    $y = ($dataY[$yIndex] - 0.5) * 2 * 3.1416;
    for($xIndex = 0; $xIndex < count($dataX); ++$xIndex) {
        $x = ($dataX[$xIndex] - 0.5) * 2 * 3.1416;
        $dataZ[$yIndex * count($dataX) + $xIndex] = sin($x) * sin($y);
    }
}

# Create a SurfaceChart object of size 720 x 540 pixels
$c = new SurfaceChart(720, 540);

# Add a title to the chart using 20 points Times New Roman Italic font
$c->addTitle("Quantum Wave Function", "timesi.ttf", 20);

# Set the center of the plot region at (360, 245), and set width x depth x height to
# 360 x 360 x 270 pixels
$c->setPlotRegion(360, 245, 360, 360, 270);

# Set the elevation and rotation angles to 20 and 30 degrees
$c->setViewAngle(20, 30);

# 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);

# Set surface grid lines to semi-transparent black (dd000000)
$c->setSurfaceAxisGrid(0xdd000000);

# 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 (645, 270).
# Set the length to 200 pixels and the labels on the right side. Use smooth gradient
# coloring.
$colorAxisObj = $c->setColorAxis(645, 270, Left, 200, Right);
$colorAxisObj->setColorGradient();

# Set the x, y and z axis titles using 10 points Arial Bold font
$c->xAxis->setTitle("x/L(x)", "arialbd.ttf", 10);
$c->yAxis->setTitle("y/L(y)", "arialbd.ttf", 10);
$c->zAxis->setTitle("Wave Function Amplitude", "arialbd.ttf", 10);

# Output the chart
header("Content-type: image/jpeg");
print($c->makeChart2(JPG));
?>