function plotRecessionCurve()
{
$xlabel = array();
$bankfull = array();
$flood = array();
$oldday = 0;
for ($t = 0; $t < 240; $t = $t + 12) {
$newday = strftime("%d", $this->basets + $t * 900);
if ($t == 0 || intval($newday) != intval($oldday)) {
$fmt = "%d %b %I %p";
} else {
$fmt = "%I %p";
}
$xlabel[$t] = strftime($fmt, $this->basets + $t * 900);
$oldday = $newday;
}
for ($i = 0; $i < 240; $i++) {
$bankfull[$i] = 2650;
$flood[$i] = 3700;
}
global $rootpath;
include_once "{$rootpath}/include/jpgraph/jpgraph.php";
include_once "{$rootpath}/include/jpgraph/jpgraph_line.php";
$graph = new Graph(640, 480, "example1");
$graph->SetScale("textlin");
$graph->setmargin(60, 20, 50, 80);
$graph->tabtitle->Set("Hydrograph");
$graph->xaxis->SetTickLabels($xlabel);
$graph->xaxis->SetTextTickInterval(12);
$graph->xaxis->SetLabelAngle(90);
$graph->yaxis->SetTitle("Flow @ Gauge (cfs)");
$graph->yaxis->SetTitleMargin(45);
$graph->legend->Pos(0.01, 0.01);
$graph->legend->SetLayout(LEGEND_HOR);
$lineplot = new LinePlot($this->flow);
$lineplot->SetColor("red");
$lineplot->SetLegend("Predicted Flow");
$lineplot2 = new LinePlot($this->baseflow);
$lineplot2->SetColor("blue");
$lineplot2->SetLegend("Base Flow");
$lineplot3 = new LinePlot($bankfull);
$lineplot3->SetColor("brown");
$lineplot3->SetLegend("BankFull (2650)");
$lineplot3->SetWeight(3);
$lineplot4 = new LinePlot($flood);
$lineplot4->SetColor("green");
$lineplot4->SetLegend("Flood (3700)");
$lineplot4->SetWeight(3);
$lineplot5 = new LinePlot(array_slice($this->obflow, 0, 240));
$lineplot5->SetColor("black");
$lineplot5->SetLegend("Ob Flow");
$lineplot5->SetWeight(1);
$graph->Add($lineplot5);
$graph->Add($lineplot4);
$graph->Add($lineplot3);
$graph->Add($lineplot2);
$graph->Add($lineplot);
$fref = "/var/webtmp/10d_" . time() . ".png";
$graph->Stroke($fref);
return "/tmp/10d_" . time() . ".png";
}
