This example shows multiple plots tiled on a single image. To place multiple plots on an image, first disable automatic output with SetPrintImage(False). Then define each plot area using SetPlotAreaPixels and create the plot. Finish each plot with DrawGraph. At the end, PrintImage outputs the image containing all of the plots.
See Section 4.8, “Multiple Plots Per Image” for more information.
Example 5.18. Two Plots on One Image
<?php
# PHPlot Example: Two plots on one image
require_once 'phplot.php';
$data1 = array( # Data array for top plot: Imports
array('1981', 5996), array('1982', 5113), array('1983', 5051),
array('1984', 5437), array('1985', 5067), array('1986', 6224),
array('1987', 6678), array('1988', 7402), array('1989', 8061),
array('1990', 8018), array('1991', 7627), array('1992', 7888),
array('1993', 8620), array('1994', 8996), array('1995', 8835),
array('1996', 9478), array('1997', 10162), array('1998', 10708),
array('1999', 10852), array('2000', 11459),
);
$data2 = array( # Data array for bottom plot: Exports
array('1981', 595), array('1982', 815), array('1983', 739),
array('1984', 722), array('1985', 781), array('1986', 785),
array('1987', 764), array('1988', 815), array('1989', 859),
array('1990', 857), array('1991', 1001), array('1992', 950),
array('1993', 1003), array('1994', 942), array('1995', 949),
array('1996', 981), array('1997', 1003), array('1998', 945),
array('1999', 940), array('2000', 1040),
);
$plot = new PHPlot(800,600);
$plot->SetImageBorderType('plain');
# Disable auto-output:
$plot->SetPrintImage(0);
# There is only one title: it is outside both plot areas.
$plot->SetTitle('US Petroleum Import/Export');
# Set up area for first plot:
$plot->SetPlotAreaPixels(80, 40, 740, 350);
# Do the first plot:
$plot->SetDataType('text-data');
$plot->SetDataValues($data1);
$plot->SetPlotAreaWorld(NULL, 0, NULL, 13000);
$plot->SetDataColors(array('blue'));
$plot->SetXTickLabelPos('none');
$plot->SetXTickPos('none');
$plot->SetYTickIncrement(1000);
$plot->SetYTitle("IMPORTS\n1000 barrels/day");
$plot->SetPlotType('bars');
$plot->DrawGraph();
# Set up area for second plot:
$plot->SetPlotAreaPixels(80, 400, 740, 550);
# Do the second plot:
$plot->SetDataType('text-data');
$plot->SetDataValues($data2);
$plot->SetPlotAreaWorld(NULL, 0, NULL, 1300);
$plot->SetDataColors(array('green'));
$plot->SetXTickLabelPos('none');
$plot->SetXTickPos('none');
$plot->SetYTickIncrement(200);
$plot->SetYTitle("EXPORTS\n1000 barrels/day");
$plot->SetPlotType('bars');
$plot->DrawGraph();
# Output the image now:
$plot->PrintImage();