// Contour plot example 04 require_once 'jpgraph/jpgraph.php'; require_once 'jpgraph/jpgraph_contour.php'; $data = array(array(12, 12, 10, 10, 8, 4), array(10, 10, 8, 14, 10, 3), array(7, 7, 13, 17, 12, 8), array(4, 5, 8, 12, 7, 6), array(10, 8, 7, 8, 10, 4)); // Setup a basic graph context with some generous margins to be able // to fit the legend $graph = new Graph(500, 380); $graph->SetMargin(40, 140, 60, 40); $graph->title->Set("Example of interpolated contour plot"); $graph->title->SetFont(FF_ARIAL, FS_BOLD, 14); $graph->title->SetMargin(10); // For contour plots it is custom to use a box style ofr the axis $graph->legend->SetPos(0.05, 0.5, 'right', 'center'); $graph->SetScale('intint'); // Setup axis and grids $graph->SetAxisStyle(AXSTYLE_BOXOUT); $graph->xgrid->SetLineStyle('dashed'); $graph->xgrid->Show(true); $graph->ygrid->SetLineStyle('dashed'); $graph->ygrid->Show(true); // A simple contour plot with 10 isobar lines and flipped Y-coordinates // Make the data smoother by interpolate the original matrice by a factor of two // which will make each grid cell half the original size $cp = new ContourPlot($data, 10, 2); $cp->UseHighContrastColor(true); // Display the legend $cp->ShowLegend(); // Make the isobar lines slightly thicker $graph->Add($cp); // ... and send the graph back to the browser $graph->Stroke();