Bubble chart is a little different from pie and bar charts because it represents three dimensional data. Data is passed in to a bubble chart as a series of [x, y, radius, ]. The optional fourth element of the data point can either be either a label string or an object having ‘label’ and/or ‘color’ properties to assign to the bubble.
The bubble chart requires plugin::BubbleRenderer .
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$pc -> set_series_default ( array (
'renderer' => 'plugin::BubbleRenderer' ,
'rendererOptions' => array (
'autoscalePointsFactor' =>- .15 , 'bubbleAlpha' => 0.6 , 'highlightAlpha' => 0.8 ) ,
'highlightMouseDown' => true , 'shadow' => true , 'shadowAlpha' => 0.05 ) ) ;
Complete reference to Bubble Chart plugin:http://www.jqplot.com/docs/files/plugins/jqplot-bubbleRenderer-js.html
Live demo
