62 lines
2.0 KiB
PHP
62 lines
2.0 KiB
PHP
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<?php
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require_once("../lib/phpchartdir.php");
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# Use random table to generate a random series. The random table is set to 1 col x 51
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# rows, with 9 as the seed
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$rantable = new RanTable(9, 1, 51);
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# Set the 1st column to start from 100, with changes between rows from -5 to +5
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$rantable->setCol(0, 100, -5, 5);
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# Get the 1st column of the random table as the data set
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$data = $rantable->getCol(0);
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# Create a XYChart object of size 600 x 300 pixels
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$c = new XYChart(600, 300);
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# Set the plotarea at (50, 35) and of size 500 x 240 pixels. Enable both the
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# horizontal and vertical grids by setting their colors to grey (0xc0c0c0)
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$plotAreaObj = $c->setPlotArea(50, 35, 500, 240);
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$plotAreaObj->setGridColor(0xc0c0c0, 0xc0c0c0);
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# Add a title to the chart using 18 point Times Bold Itatic font.
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$c->addTitle("LOWESS Generic Curve Fitting Algorithm", "timesbi.ttf", 18);
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# Set the y axis line width to 3 pixels
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$c->yAxis->setWidth(3);
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# Add a title to the x axis using 12 pts Arial Bold Italic font
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$c->xAxis->setTitle("Server Load (TPS)", "arialbi.ttf", 12);
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# Set the x axis line width to 3 pixels
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$c->xAxis->setWidth(3);
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# Set the x axis scale from 0 - 50, with major tick every 5 units and minor tick
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# every 1 unit
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$c->xAxis->setLinearScale(0, 50, 5, 1);
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# Add a blue layer to the chart
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$layer = $c->addLineLayer2();
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# Add a red (0x80ff0000) data set to the chart with square symbols
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$dataSetObj = $layer->addDataSet($data, 0x80ff0000);
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$dataSetObj->setDataSymbol(SquareSymbol);
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# Set the line width to 2 pixels
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$layer->setLineWidth(2);
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# Use lowess for curve fitting, and plot the fitted data using a spline layer with
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# line width set to 3 pixels
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$curve = new ArrayMath($data);
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$curve->lowess();
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$splineLayerObj = $c->addSplineLayer($curve->result(), 0x0000ff);
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$splineLayerObj->setLineWidth(3);
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# Set zero affinity to 0 to make sure the line is displayed in the most detail scale
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$c->yAxis->setAutoScale(0, 0, 0);
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# output the chart
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header("Content-type: image/png");
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print($c->makeChart2(PNG));
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?>
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