Continue vs. discrete functions

[Raymond Chui]

Currently if I have two point x1,y1 and x2,y2 plot on XYChart. I will
auto get a solid line draw between two points. That looks like the
continuous function. Is there an option I can set ture/false to turn
on/off that solid line make it just plot the points, looks like discrete
function or discontinue XY plot?

[David Gilbert]

This is controlled by the renderer object in the XYPlot. You can either use the createScatterPlot(...) method in the ChartFactory class, or change the renderer for an existing chart as follows:

XYPlot plot = myChart.getXYPlot();
XYItemRenderer renderer = new StandardXYItemRenderer(StandardXYItemRenderer.SHAPES, new StandardXYToolTipGenerator());
plot.setXYItemRenderer(renderer);

Regards,

DG.

[josh]

in method drawItem of class StandardXYItemRenderer do this to make it discrete:

// get the previous data point...
//Number x0 = data.getXValue(series, item-1);
//Number y0 = data.getYValue(series, item-1);
Number x0=x1; //added this
Number y0=new Double(verticalAxis.getMinimumAxisValue()); //added this