[42] | 1 | <?php // content="text/plain; charset=utf-8" |
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| 2 | require_once ('jpgraph/jpgraph.php'); |
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| 3 | require_once ('jpgraph/jpgraph_line.php'); |
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| 4 | require_once ('jpgraph/jpgraph_scatter.php'); |
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| 5 | require_once ('jpgraph/jpgraph_regstat.php'); |
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| 6 | |
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| 7 | // Original data points |
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| 8 | $xdata = array(1,3,12,15); |
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| 9 | $ydata = array(5,15,2,19); |
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| 10 | |
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| 11 | // Get the interpolated values by creating |
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| 12 | // a new Spline object. |
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| 13 | $bez = new Bezier($xdata,$ydata); |
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| 14 | |
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| 15 | // For the new data set we want 40 points to |
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| 16 | // get a smooth curve. |
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| 17 | list($newx,$newy) = $bez->Get(50); |
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| 18 | |
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| 19 | // Create the graph |
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| 20 | $g = new Graph(300,200); |
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| 21 | $g->SetMargin(30,20,40,30); |
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| 22 | $g->title->Set("Bezier interpolation"); |
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| 23 | $g->title->SetFont(FF_ARIAL,FS_NORMAL,12); |
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| 24 | $g->subtitle->Set('(Control points shown in red)'); |
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| 25 | $g->subtitle->SetColor('darkred'); |
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| 26 | $g->SetMarginColor('lightblue'); |
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| 27 | |
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| 28 | //$g->img->SetAntiAliasing(); |
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| 29 | |
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| 30 | // We need a linlin scale since we provide both |
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| 31 | // x and y coordinates for the data points. |
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| 32 | $g->SetScale('linlin'); |
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| 33 | |
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| 34 | // We want 1 decimal for the X-label |
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| 35 | $g->xaxis->SetLabelFormat('%1.1f'); |
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| 36 | |
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| 37 | // We use a scatterplot to illustrate the original |
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| 38 | // contro points. |
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| 39 | $bplot = new ScatterPlot($ydata,$xdata); |
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| 40 | $bplot->mark->SetFillColor('red@0.3'); |
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| 41 | $bplot->mark->SetColor('red@0.5'); |
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| 42 | |
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| 43 | // And a line plot to stroke the smooth curve we got |
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| 44 | // from the original control points |
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| 45 | $lplot = new LinePlot($newy,$newx); |
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| 46 | $lplot->SetColor('navy'); |
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| 47 | |
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| 48 | // Add the plots to the graph and stroke |
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| 49 | $g->Add($lplot); |
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| 50 | $g->Add($bplot); |
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| 51 | $g->Stroke(); |
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| 52 | |
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| 53 | ?> |
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| 54 | |
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