//---render the TITLE. If no title, this will return zero.
float chartTitleHeight = super.renderChartTitle( this.iRadarChartDataSet.
getChartTitle(), fontRenderContext );
this.radarChartDataProcessor = new RadarChartDataProcessor( this.iRadarChartDataSet );
this.radarChartDataProcessor.processData();
// set scale max value
if( Double.isNaN( props.getScaleMaxValue() ) )
this.scaleMax = radarChartDataProcessor.getMaxValue();