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

# The XY data of the first data series
$dataX0 = array(10, 35, 17, 4, 22, 29, 45, 52, 63, 39);
$dataY0 = array(2.0, 3.2, 2.7, 1.2, 2.8, 2.9, 3.1, 3.0, 2.3, 3.3);

# The XY data of the second data series
$dataX1 = array(30, 35, 17, 4, 22, 59, 43, 52, 63, 39);
$dataY1 = array(1.0, 1.3, 0.7, 0.6, 0.8, 3.0, 1.8, 2.3, 3.4, 1.5);

# The XY data of the third data series
$dataX2 = array(28, 35, 15, 10, 22, 60, 46, 64, 39);
$dataY2 = array(2.0, 2.2, 1.2, 0.4, 1.8, 2.7, 2.4, 2.8, 2.4);

# Create a XYChart object of size 540 x 480 pixels
$c = new XYChart(540, 480);

# Set the plotarea at (70, 65) and of size 400 x 350 pixels, with white background
# and a light grey border (0xc0c0c0). Turn on both horizontal and vertical grid lines
# with light grey color (0xc0c0c0)
$c->setPlotArea(70, 65, 400, 350, 0xffffff, -1, 0xc0c0c0, 0xc0c0c0, -1);

# Add a legend box with the top center point anchored at (270, 30). Use horizontal
# layout. Use 10 pts Arial Bold Italic font. Set the background and border color to
# Transparent.
$legendBox = $c->addLegend(270, 30, false, "arialbi.ttf", 10);
$legendBox->setAlignment(TopCenter);
$legendBox->setBackground(Transparent, Transparent);

# Add a title to the chart using 18 point Times Bold Itatic font.
$c->addTitle("Parametric Curve Fitting", "timesbi.ttf", 18);

# Add titles to the axes using 12 pts Arial Bold Italic font
$c->yAxis->setTitle("Axis Title Placeholder", "arialbi.ttf", 12);
$c->xAxis->setTitle("Axis Title Placeholder", "arialbi.ttf", 12);

# Set the axes line width to 3 pixels
$c->yAxis->setWidth(3);
$c->xAxis->setWidth(3);

# Add a scatter layer using (dataX0, dataY0)
$c->addScatterLayer($dataX0, $dataY0, "Polynomial", GlassSphere2Shape, 11, 0xff0000);

# Add a degree 2 polynomial trend line layer for (dataX0, dataY0)
$trend0 = $c->addTrendLayer2($dataX0, $dataY0, 0xff0000);
$trend0->setLineWidth(3);
$trend0->setRegressionType(PolynomialRegression(2));

# Add a scatter layer for (dataX1, dataY1)
$c->addScatterLayer($dataX1, $dataY1, "Exponential", GlassSphere2Shape, 11, 0x00aa00)
    ;

# Add an exponential trend line layer for (dataX1, dataY1)
$trend1 = $c->addTrendLayer2($dataX1, $dataY1, 0x00aa00);
$trend1->setLineWidth(3);
$trend1->setRegressionType(ExponentialRegression);

# Add a scatter layer using (dataX2, dataY2)
$c->addScatterLayer($dataX2, $dataY2, "Logarithmic", GlassSphere2Shape, 11, 0x0000ff)
    ;

# Add a logarithmic trend line layer for (dataX2, dataY2)
$trend2 = $c->addTrendLayer2($dataX2, $dataY2, 0x0000ff);
$trend2->setLineWidth(3);
$trend2->setRegressionType(LogarithmicRegression);

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