matrix_introex.php
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<?php
require_once ('jpgraph/jpgraph.php');
require_once ('jpgraph/jpgraph_matrix.php');
require_once ('jpgraph/jpgraph_iconplot.php');
 
$data = array(
    array(0,1,2,3,4,5,6,7,8,9,10),
    array(10,9,8,7,6,5,4,3,2,1,0),
    array(0,1,2,3,4,5,6,7,8,9,10),
    array(10,9,8,17,6,5,4,3,2,1,0),
    array(0,1,2,3,4,4,9,7,8,9,10),
    array(8,1,2,3,4,8,3,7,8,9,10),
    array(10,3,5,7,6,5,4,3,12,1,0),
    array(10,9,8,7,6,5,4,3,2,1,0),
);
// Interpolate the data a factor of 4 to get some mroe 
// data points
doMeshInterpolate($data,4);
 
// Setup a timer
$timer = new JpgTimer();
$timer->Push();
 
//--------------------------------------------------------------
// Setup a basic matrix graph
//--------------------------------------------------------------
$width = 740; $height = 500;
$graph = new MatrixGraph($width,$height);
$graph->SetMargin(1,2,70,1);
$graph->SetColor('white');
$graph->SetMarginColor('#fafafa');
$graph->title->Set('Intro matrix graph');
$graph->title->SetFont(FF_ARIAL,FS_BOLD,14);
 
// Setup the background image
$graph->SetBackgroundImage('fireplace.jpg',BGIMG_FILLPLOT);
$graph->SetBackgroundImageMix(50);
 
// Setup the timer in the right footer
$graph->footer->SetTimer($timer);
$graph->footer->right->SetColor('white');
 
//--------------------------------------------------------------
// Create the 2 matrix plots
//--------------------------------------------------------------
$mp = array(); $n = 2;
for($i=0; $i < $n; ++$i){
    $mp[$i] = new MatrixPlot($data);
    $mp[$i]->colormap->SetMap($i);
    $mp[$i]->SetSize(300,250);    
    $mp[$i]->SetLegendLayout(1);
    $mp[$i]->SetAlpha(0.2);
    
    // Make the legend slightly longer than default
    $mp[$i]->legend->SetSize(20,280);
}
$mp[1]->colormap->SetMap(3);
 
$hor1 = new LayoutHor(array($mp[0],$mp[1]));
$hor1->SetCenterPos(0.5,0.5);
 
$graph->Add($hor1);
 
//--------------------------------------------------------------
// Add texts to the graph
//--------------------------------------------------------------
$txts = array( 
    array('Temperature gradient',$width/2,80),
    array('Heat color map',200,110),
    array('High contrast map',560,110));
 
$n=count($txts);
$t=array();
for($i=0; $i < $n; ++$i){
    $t[$i] = new Text($txts[$i][0],$txts[$i][1],$txts[$i][2]);
    $t[$i]->SetFont(FF_ARIAL,FS_BOLD,14);
    $t[$i]->SetColor('white');
    $t[$i]->SetAlign('center','top');
}
$graph->Add($t);
 
//--------------------------------------------------------------
// Add Jpgraph logo to top left corner
//--------------------------------------------------------------
$icon = new IconPlot('jpglogo.jpg',2,2,0.9,50);
$graph->Add($icon);
 
$graph->Stroke();
?>