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Missing points handling

pChart can support data series with missing points. Points that have an undefined values must be declared with the VOID class constant. By default the chart rendering will break on this values and continue again when enough consistent values are found again. You may want to have a chart continuity even in the case of missing values. To do so you can use the BreakVoid option.

The BreakVoid option apply to line and spline charts it does not compute the missing points but will draw a straight dashed line to the last known value. If you need to compute the missing points, you‘ll have to call an external statistics library.

The following parameters can be tunned :

The size of the ticks can be set with VoidTicks.
The line color can be set with BreakR,BreakG,BreakB.


Example



Let‘s assume the following dataset :
$myData = new pData();
$myData->addPoints(array(10,-7,-43,VOID,-30,-20,-21,34),"Serie1");
$myData->setSerieDescription("Serie1","Serie 1");
You can turn on the missing point processing this way :
$Config = array("BreakVoid"=>FALSE, "BreakR"=>234, "BreakG"=>55, "BreakB"=>26);
$myPicture->drawSplineChart($Config);

The missing points will be drawn with red lines (RGB 234,55,26).
Last updated on 01/08/2011 
by Jean-Damien 
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