5.2. Example - Line Plot: Functions
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## 5.2. Example - Line Plot: Functions

This is a line plot showing the graph of sin(x) and cos(x). This uses quite a few of the PHPlot style control functions to tune the appearance of the plot.

Example 5.2. Line Plot: Functions

    <?php
    # PHPlot Example: Line graph, 2 lines
    require_once 'phplot.php';

    # Generate data for:
    #   Y1 = sin(x)
    #   Y2 = cos(x)
    $end = M_PI * 2.0;
    $delta = $end / 20.0;
    $data = array();
    for ($x = 0; $x <= $end; $x += $delta)
      $data[] = array('', $x, sin($x), cos($x));

    $plot = new PHPlot(800, 600);
    $plot->SetImageBorderType('plain');

    $plot->SetPlotType('lines');
    $plot->SetDataType('data-data');
    $plot->SetDataValues($data);

    # Main plot title:
    $plot->SetTitle('Line Plot, Sin and Cos');

    # Make a legend for the 2 functions:
    $plot->SetLegend(array('sin(t)', 'cos(t)'));

    # Select a plot area and force ticks to nice values:
    $plot->SetPlotAreaWorld(0, -1, 6.8, 1);

    # Even though the data labels are empty, with numeric formatting they
    # will be output as zeros unless we turn them off:
    $plot->SetXDataLabelPos('none');

    $plot->SetXTickIncrement(M_PI / 8.0);
    $plot->SetXLabelType('data');
    $plot->SetPrecisionX(3);

    $plot->SetYTickIncrement(0.2);
    $plot->SetYLabelType('data');
    $plot->SetPrecisionY(1);

    # Draw both grids:
    $plot->SetDrawXGrid(True);
    $plot->SetDrawYGrid(True);

    $plot->DrawGraph();

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