<?php // content="text/plain; charset=utf-8"
require_once('jpgraph/jpgraph.php');
require_once('jpgraph/jpgraph_matrix.php');

$data = array(
    array(0,null,2,3,4,5,6,7,8,9,10,8,6,4,2),
    array(10,9,8,7,6,5,4,3,2,1,0,8,5,9,2),
    array(0,1,2,3,4,5,6,7,8,9,10,2,4,5,7),
    array(10,9,8,17,6,5,4,3,2,1,0,8,6,4,2),
    array(0,1,2,3,4,4,9,7,8,9,10,3,2,7,2),
    array(8,1,2,3,4,8,3,7,8,9,10,5,3,9,1),
    array(10,3,5,7,6,5,4,3,12,1,0,6,5,10,2),
    array(10,9,8,7,6,5,4,3,2,1,null,8,6,4,2),
);

for ($i=0; $i < count($data[0]); ++$i) {
    $xlabels[$i] = sprintf('xlabel: %02d', $i);
}
for ($i=0; $i < count($data); ++$i) {
    $ylabels[$i] = sprintf('ylabel: %02d', $i);
}

// Setup a nasic matrix graph
$graph = new MatrixGraph(400, 250);
$graph->SetMarginColor('white');
$graph->title->Set('Adding labels on the edges');
$graph->title->SetFont(FF_ARIAL, FS_BOLD, 14);

// Create one matrix plot
$mp = new MatrixPlot($data, 1);
$mp->SetModuleSize(13, 15);
$mp->SetCenterPos(0.35, 0.45);
$mp->colormap->SetNullColor('gray');

// Setup column lablels
$mp->collabel->Set($xlabels);
$mp->collabel->SetSide('bottom');
$mp->collabel->SetFont(FF_ARIAL, FS_NORMAL, 8);
$mp->collabel->SetFontColor('darkgray');

// Setup row lablels
$mp->rowlabel->Set($ylabels);
$mp->rowlabel->SetSide('right');
$mp->rowlabel->SetFont(FF_ARIAL, FS_NORMAL, 8);
$mp->rowlabel->SetFontColor('darkgray');

// Move the legend more to the right
$mp->legend->SetMargin(90);

$graph->Add($mp);
$graph->Stroke();
