<?php
require_once("/usr/local/lib/php/20100525/phpchartdir.php");

# The data for the line chart
$data0 = array(70, 73, 80, 90, 95, 93, 82, 77, 82, 101, 111, 115);
$data1 = array(90, 96, 89, 77, 82, 96, 109, 109, 99, 108, 96, 91);
$data2 = array(58, 34, 25, 49, 64, 10, 16, 40, 25, 49, 40, 22);

# The labels for the line chart
$labels = array("2008-01", "2008-02", "2008-03", "2008-04", "2008-05", "2008-06",
    "2008-07", "2008-08", "2008-09", "2008-10", "2008-11", "2008-12");

# Create a XYChart object of size 450 x 450 pixels
$c = new XYChart(450, 450);

# Add a title to the chart using 15 pts Arial Italic font.
$title = $c->addTitle("Inter-line Coloring", "ariali.ttf", 15);

# Add a legend box where the top-center is anchored to the horizontal center of the
# chart, just under the title. Use horizontal layout and 10 points Arial Bold font,
# and transparent background and border. Use line style legend key.
$legendBox = $c->addLegend($c->getWidth() / 2, $title->getHeight(), false,
    "arialbi.ttf", 10);
$legendBox->setBackground(Transparent, Transparent);
$legendBox->setAlignment(TopCenter);
$legendBox->setLineStyleKey();

# Tentatively set the plotarea at (70, 65) and of (chart_width - 100) x (chart_height
# - 110) in size. Use light grey (c0c0c0) border and horizontal and vertical grid
# lines.
$plotArea = $c->setPlotArea(70, 65, $c->getWidth() - 100, $c->getHeight() - 110, -1,
    -1, 0xc0c0c0, 0xc0c0c0, -1);

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

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

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

# Set the labels on the x axis.
$c->xAxis->setLabels($labels);

# Use 8 points Arial rotated by 90 degrees as the x-axis label font
$c->xAxis->setLabelStyle("Arial", 8, TextColor, 90);

# Add a spline curve to the chart
$layer0 = $c->addSplineLayer($data0, 0xff0000, "Data Set 0");
$layer0->setLineWidth(2);

# Add a normal line to the chart
$layer1 = $c->addLineLayer($data1, 0x008800, "Data Set 1");
$layer1->setLineWidth(2);

# Color the region between the above spline curve and normal line. Use the
# semi-transparent red (80ff000000) if the spline curve is higher than the normal
# line, otherwise use semi-transparent green (80008800)
$c->addInterLineLayer($layer0->getLine(), $layer1->getLine(), 0x80ff0000, 0x80008800)
    ;

# Add another normal line to the chart
$layer2 = $c->addLineLayer($data2, 0x0000ff, "Data Set 2");
$layer2->setLineWidth(2);

# Add a horizontal mark line to the chart at y = 40
$mark = $c->yAxis->addMark(40, -1, "Threshold");
$mark->setLineWidth(2);

# Set the mark line to purple (880088) dash line. Use white (ffffff) for the mark
# label.
$mark->setMarkColor($c->dashLineColor(0x880088), 0xffffff);

# Put the mark label at the left side of the mark, with a purple (880088) background.
$mark->setAlignment(Left);
$mark->setBackground(0x880088);

# Color the region between the above normal line and mark line. Use the
# semi-transparent blue (800000ff) if the normal line is higher than the mark line,
# otherwise use semi-transparent purple (80880088)
$c->addInterLineLayer($layer2->getLine(), $mark->getLine(), 0x800000ff, 0x80880088);

# Layout the legend box, so we can get its height
$c->layoutLegend();

# Adjust the plot area size, such that the bounding box (inclusive of axes) is 10
# pixels from the left edge, just under the legend box, 25 pixels from the right
# edge, and 10 pixels from the bottom edge.
$c->packPlotArea(10, $legendBox->getTopY() + $legendBox->getHeight(), $c->getWidth()
     - 25, $c->getHeight() - 10);

# After determining the exact plot area position, we may adjust the legend box and
# the title positions so that they are centered relative to the plot area (instead of
# the chart)
$legendBox->setPos($plotArea->getLeftX() + ($plotArea->getWidth() -
    $legendBox->getWidth()) / 2, $legendBox->getTopY());
$title->setPos($plotArea->getLeftX() + ($plotArea->getWidth() - $title->getWidth()) /
    2, $title->getTopY());

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