This function allows you to bind a data serie to one ordinate axis. You can create as many axis as you want. If the axis ID you are specifying does not exists it will be created with it‘s default parameters. You can then name it, place it and specify how to display data on it.

It is important to create different axis to dispatch data series of different natures. You can‘t scale the same way temperatures (°C) and humidity values (%). Creating two axis, one for each kind of data will help you to display the link between this two entities on the same chart without stretching the scales.

setSerieOnAxis($Series,$AxisID);

Where :

 /* Create the pData object */
 $MyData = new pData(); 

 /* Create some dummy data */
 $myData->addPoints(array(10,11,14,13),"Temperature");
 $myData->addPoints(array(70,70,69,68),"Humidity");

 /* Dispatch the two data series on dedicated axis */
 $MyData->setSerieOnAxis("Temperature",0); // This one isn‘t needed as this is the default serie
 $MyData->setSerieOnAxis("Humidity",1);

 $MyData = new pData();  

 /* Prepare some nice data & axis config */
 $MyData->addPoints(array(24,-25,26,25,25),"Temperature");
 $MyData->addPoints(array(1,2,VOID,9,10),"Humidity 1");
 $MyData->addPoints(array(1,VOID,7,-9,0),"Humidity 2");
 $MyData->addPoints(array(-1,-1,-1,-1,-1),"Humidity 3");
 $MyData->addPoints(array(0,0,0,0,0),"Vide");
 $MyData->setSerieOnAxis("Temperature",0);
 $MyData->setSerieOnAxis("Humidity 1",1);
 $MyData->setSerieOnAxis("Humidity 2",1);
 $MyData->setSerieOnAxis("Humidity 3",1);
 $MyData->setSerieOnAxis("Vide",2);
 $MyData->setAxisPosition(2,AXIS_POSITION_RIGHT);
 $MyData->setAxisName(0,"Temperature");
 $MyData->setAxisName(1,"Humidity");
 $MyData->setAxisName(2,"Empty value");

 /* Bind a data serie to the X axis */
 $MyData->addPoints(array("Jan","Feb","Mar","Apr","May","Jun"),"Labels");
 $MyData->setSerieDescription("Labels","My labels");
 $MyData->setAbscissa("Labels");

 /* Define the graph area and do some makeup */
 $myPicture->setGraphArea(90,60,660,190);
 $myPicture->drawText(350,55,"My chart title",array("FontSize"=>20,"Align"=>TEXT_ALIGN_BOTTOMMIDDLE));
 $myPicture->drawFilledRectangle(90,60,660,190,array("R"=>255,"G"=>255,"B"=>255,"Surrounding"=>-200,"Alpha"=>10));

 /* Compute and draw the scale */
 $myPicture->drawScale(array("DrawYLines"=>array(0)));