# Make some pseudo-random data. mt_srand(1); $data = array(); $value = 10; for ($i = 0; $i < 500; $i++) { $data[] = array('', $i, $value); $value = max(0, $value + mt_rand(-9, 10)); } # Make a color gradient array of blue: $colors = array(); for ($b = 32; $b <= 255; $b += 2) { $colors[] = array(0, 0, $b); } for ($b = 255; $b >= 32; $b -= 2) { $colors[] = array(0, 0, $b); } # Use a truecolor plot image in order to get more colors. $plot = new PHPlot_truecolor(800, 600); $plot->SetImageBorderType('plain'); // Improves presentation in the manual $plot->SetPlotType('thinbarline'); $plot->SetDataType('data-data'); $plot->SetDataValues($data); $plot->SetLineWidths(2); $plot->SetDataColors($colors); $plot->SetXTickPos('none'); $plot->SetPlotAreaWorld(0, 0, 500, NULL); $plot->SetTitle('Meaningless Data with Color Gradient'); # Establish the function 'getcolor' as a data color selection callback. $plot->SetCallback('data_color', 'getcolor'); $plot->DrawGraph();
// Y range $max_z = 100; // Z range $alpha = 80; // Alpha (transparency) for data colors. 0=opaque, 127=clear. $data = array(); mt_srand(1); for ($x = 0; $x < $n_x; $x++) { $row = array('', mt_rand(0, $max_x - 1)); // Label and X value for ($y = 0; $y < $n_y; $y++) { $row[] = mt_rand(0, $max_y - 1); // Y value $row[] = mt_rand(0, $max_z - 1); // Z value } $data[] = $row; } $legend = array(); for ($y = 0; $y < $n_y; $y++) { $legend[] = "Data Set {$y}"; } $p = new PHPlot_truecolor(800, 600); $p->SetTitle("Bubble Plot - Random data, Truecolor\nTranslucent (alpha={$alpha}) bubbles"); $p->SetDataColors(NULL, NULL, $alpha); $p->SetDataType('data-data-xyz'); $p->SetPlotType('bubbles'); $p->SetDataValues($data); $p->SetLegend($legend); $p->SetPlotAreaWorld(0, 0, $max_x, $max_y); $p->DrawGraph();