source: trunk/xgraph/jpgraph/Examples/contour2_ex3.php

<?php // content="text/plain; charset=utf-8"

require_once ('jpgraph/jpgraph.php');
require_once ('jpgraph/jpgraph_contourf.php');

// Setup some data to use for the contour
$data = array(
    array (12,12,10,10),
    array (10,10,8,14),
    array (7,7,13,17),
    array (4,5,8,12),
    array (10,8,7,8));

// create a basic graph as a container
$graph = new Graph(300,300);
$graph->SetMargin(30, 30, 40, 30);
$graph->SetScale('intint');
$graph->SetMarginColor('white');

// Setup title of graph
$graph->title->Set('Filled contour plot');
$graph->title->SetFont(FF_VERDANA,FS_BOLD,12);

$graph->subtitle->Set('(Manual colors)');
$graph->subtitle->SetFont(FF_VERDANA,FS_ITALIC,10);

// Create a new contour plot with only 3 isobars
$cp = new FilledContourPlot($data,3);

// Specify the colors manually
$isobar_colors = array('lightgray','teal:1.3','orange','red');
$cp->SetIsobarColors($isobar_colors);

// Use only blue/red color schema
$cp->UseHighContrastColor(true);

// Flip visually 
$cp->SetInvert();

// Fill the contours
$cp->SetFilled(true);

// Display labels
$cp->ShowLabels(true);

// No lines
$cp->ShowLines(false);

// And add the plot to the graph
$graph->Add($cp);

// Send it back to the client
$graph->stroke();

?>