PlotType = 'Points', SetXDataLabelPos('plotin') ?

[Timothy Edgar]

Is it possible to set XDataLabelPos to 'plotin' in a 'points' graph? I tried using SetYDataLabelPos to 'plotin', but this just labeled the points with their Y values. I want the points labeled with the text name associated with the point in the array.

~~~~~~~~~~~~
// Make a points plot using the above data:
$plot = new PHPlot($height, $width);
$plot->SetDataType('data-data');
$plot->SetDataValues($data);
$plot->SetPlotType('points');
$plot->SetTitle('Map');
$plot->SetPlotAreaWorld(-1 * $worldrow["size"], -1 * $worldrow["size"], $worldrow["size"], #$worldrow["size"]);

// Move axes and ticks to 0,0, but turn off tick labels:
$plot->SetXAxisPosition(0); # Is default
$plot->SetYAxisPosition(0);
$plot->SetXTickPos('xaxis');
$plot->SetXTickLabelPos('none');
$plot->SetYTickPos('yaxis');
$plot->SetYTickLabelPos('none');
$plot->SetXDataLabelPos('plotin');
~~~~~~~~~~~~~~~~~~~~~~~~~~~

[lbayuk]

Yes it is possible, but it takes a bit of work. Firstly, though, what you want are Y data labels, not X data labels. I know this sounds wrong, but by default these labels display the Y values at the data points, so they are called Y data labels.

Secondly, you will use a custom label formatting function to make the label text equal to the values from your data array. PHPlot-5.8.0 or higher is required in order to use the $row argument with custom label formatting.

More information is in the manual here and also see the reference for SetXDataLabelType

Here is a simple, complete example:

<?php
require_once "phplot.php";
// Y Data Labels above the points, showing the labels from the data array.

$data = array(
    array('Jan', 1, 0),
    array('Feb', 2, 10),
    array('Mar', 3, 20),
    array('Apr', 4, 25),
    array('May', 5, 18),
    array('Jun', 6, 12),
);

function get_label($ignored_label, $data, $row = NULL, $ignored_column = NULL)
{
    return $data[$row][0];
}

$plot = new PHPlot(600, 400);
$plot->SetDataType('data-data');
$plot->SetDataValues($data);
$plot->SetPlotType('points');
$plot->SetYDataLabelType('custom', 'get_label', $data);
$plot->SetYDataLabelPos('plotin');
$plot->SetXTickLabelPos('none');
$plot->SetXDataLabelPos('none');
$plot->DrawGraph();

[Timothy Edgar]

Awesome. Thank you! Works perfectly.