Require pChart 2.0.13

Linear bubble charts is a convenient way to draw data that got two parameters. In this approach, the 1st parameter is the Y axis value and the second one a value representing something link to this point. We can imagine the association "items in stock" / "items ordered" that would reflect the current status of your stock an it‘s forecast growth.




Let‘s assume that we got the data represented in the table bellow :



This will lead to the following declaration with the pData object structure :

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

 /* Provide this year data */
 $MyData->addPoints(array(34,55,15,62,38,42),"ThisYear");
 $MyData->addPoints(array(5,10,8,9,15,10),"ThisYearNeeds");
 $MyData->setSerieDescription("ThisYear","This year");

 /* Provide last year data */
 $MyData->addPoints(array(5,10,5,1,0,10),"LastYear");
 $MyData->addPoints(array(6,10,14,10,14,6),"LastYearNeeds");
 $MyData->setSerieDescription("LastYear","Last year");

 /* Give a name to the X axis */
 $MyData->setAxisName(0,"Current stock");

 $MyData->addPoints(array("Apple","Banana","Orange","Lemon","Peach","Strawberry"),"Product");
 $MyData->setAbscissa("Product");

You‘ll then have to update your scale before calling the drawScale() function :

 /* Scale up for the bubble chart */
 $bubbleDataSeries   = array("thisYear","LastYear");
 $bubbleWeightSeries = array("ThisYearNeeds","LastYearNeeds");
 $myBubbleChart->bubbleScale($bubbleDataSeries,$bubbleWeightSeries);

Finally, when the scale is drawn, just call the drawBubbleChart() function with the same arrays :

 $myBubbleChart->drawBubbleChart($bubbleDataSeries,$bubbleWeightSeries);