// 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();
