junaidp - 2012-02-07

I have a spline in my chart

Series ser = chart.createSeries();
chart.addSeries(ser
.setName("Temperature")
.setType(Series.Type.SPLINE)
.setPoints(
new Number[][] {
{getTime("2010-09-05 06"), -3.8},
{getTime("2010-09-05 12"), 3.1},
{getTime("2010-09-05 18"), 2.4},
{getTime("2010-09-06 00"), 2.1},

                    })

                    .setPlotOptions(new ColumnPlotOptions()
                    .setZIndex(1)                                            
                    .setColor("#4572A7"))
        );

spline color is blue , Now i want this color to remain blue but when it goes to a negative value(e.g my first point) only that part of spline becomes red .

like this http://keepitcloud.com/meteograms/ (at the left top you can see a small part of spline is red)

Any idea how can i achieve this