Subversion-Projekte lars-tiefland.php_share

<?php

include "../jpgraph.php";

include "../jpgraph_line.php";

include "../jpgraph_scatter.php";

include "../jpgraph_regstat.php";

// Original data points

$xdata = array(1,3,5,7,9,12,15,17.1);

$ydata = array(5,1,9,6,4,3,19,12);

// Get the interpolated values by creating

// a new Spline object.

$spline = new Spline($xdata,$ydata);

// For the new data set we want 40 points to

// get a smooth curve.

list($newx,$newy) = $spline->Get(50);

// Create the graph

$g = new Graph(300,200);

$g->SetMargin(30,20,40,30);

$g->title->Set("Natural cubic splines");

$g->title->SetFont(FF_ARIAL,FS_NORMAL,12);

$g->subtitle->Set('(Control points shown in red)');

$g->subtitle->SetColor('darkred');

$g->SetMarginColor('lightblue');

//$g->img->SetAntiAliasing();

// We need a linlin scale since we provide both

// x and y coordinates for the data points.

$g->SetScale('linlin');

// We want 1 decimal for the X-label

$g->xaxis->SetLabelFormat('%1.1f');

// We use a scatterplot to illustrate the original

// contro points.

$splot = new ScatterPlot($ydata,$xdata);

//

$splot->mark->SetFillColor('red@0.3');

$splot->mark->SetColor('red@0.5');

// And a line plot to stroke the smooth curve we got

// from the original control points

$lplot = new LinePlot($newy,$newx);

$lplot->SetColor('navy');

// Add the plots to the graph and stroke

$g->Add($lplot);

$g->Add($splot);

$g->Stroke();

?>