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

#===================================================================
#    For demo purpose, use random numbers as data for the chart
#===================================================================

# Use a random table to create the data. The random table contains 4 cols x 31 rows,
# using 9 as seed.
$rantable = new RanTable(9, 4, 31);

# Set the 1st col to be the series 1, 2, 3, ....
$rantable->setCol(0, 1, 1, 1);

# Set the 2nd, 3rd and 4th col to be random number starting from 40, 50 and 60. The
# change between rows is set to -5 to 5. The minimum value of any cell is 0.
$rantable->setCol(1, 40, -5, 5, 0);
$rantable->setCol(2, 50, -5, 5, 0);
$rantable->setCol(3, 60, -5, 5, 0);

# Use the 1st col as the axis label
$labels = $rantable->getCol(0);

# Use the 2nd, 3rd and 4th columns for 3 lines
$data0 = $rantable->getCol(1);
$data1 = $rantable->getCol(2);
$data2 = $rantable->getCol(3);

# Simulate some data points have no data value
for($i = 1; $i < 30; $i += 7) {
    $data0[$i] = NoValue;
    $data1[$i] = NoValue;
    $data2[$i] = NoValue;
}

#===================================================================
#    Now we have the data ready. Actually drawing the chart.
#===================================================================

# Create a XYChart object of size 600 x 220 pixels
$c = new XYChart(600, 220);

# Set the plot area at (100, 25) and of size 450 x 150 pixels. Enabled both vertical
# and horizontal grids by setting their colors to light grey (0xc0c0c0)
$plotAreaObj = $c->setPlotArea(100, 25, 450, 150);
$plotAreaObj->setGridColor(0xc0c0c0, 0xc0c0c0);

# Add a legend box (92, 0) (top of plot area) using horizontal layout. Use 8 pts
# Arial font. Disable bounding box (set border to transparent).
$legendObj = $c->addLegend(92, 0, false, "", 8);
$legendObj->setBackground(Transparent);

# Add a title to the y axis. Draw the title upright (font angle = 0)
$textBoxObj = $c->yAxis->setTitle("Average\nUtilization\n(MBytes)");
$textBoxObj->setFontAngle(0);

# Use manually scaling of y axis from 0 to 100, with ticks every 10 units
$c->yAxis->setLinearScale(0, 100, 10);

# Set the labels on the x axis
$c->xAxis->setLabels2($labels);

# Set the title on the x axis
$c->xAxis->setTitle("Jun - 2001");

# Add x axis (vertical) zones to indicate Saturdays and Sundays
for($i = 0; $i < 29; $i += 7) {
    $c->xAxis->addZone($i, $i + 2, 0xc0c0c0);
}

# Add a line layer to the chart
$layer = $c->addLineLayer();

# Set the default line width to 2 pixels
$layer->setLineWidth(2);

# Add the three data sets to the line layer
$layer->addDataSet($data0, 0xcf4040, "Server #1");
$layer->addDataSet($data1, 0x40cf40, "Server #2");
$layer->addDataSet($data2, 0x4040cf, "Server #3");

# Layout the chart to fix the y axis scaling. We can then use getXCoor and getYCoor
# to determine the position of custom objects.
$c->layout();

# Add the "week n" custom text boxes at the top of the plot area.
for($i = 0; $i < 4; ++$i) {
    # Add the "week n" text box using 8 pt Arial font with top center alignment.
    $textbox = $c->addText($layer->getXCoor($i * 7 + 2), 25, "Week $i",
        "arialbd.ttf", 8, 0x000000, TopCenter);

    # Set the box width to cover five days
    $textbox->setSize($layer->getXCoor($i * 7 + 7) - $layer->getXCoor($i * 7 + 2) +
        1, 0);

    # Set box background to pale yellow 0xffff80, with a 1 pixel 3D border
    $textbox->setBackground(0xffff80, Transparent, 1);
}

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