Inizializzazione

jpgraph-3.5.0b1/src/Examples/splineex1.php

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+<?php // content="text/plain; charset=utf-8"
+require_once ('jpgraph/jpgraph.php');
+require_once ('jpgraph/jpgraph_line.php');
+require_once ('jpgraph/jpgraph_scatter.php');
+require_once ('jpgraph/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();
+
+?>
+