how to know color of lines in TimeSeriesChart?

[fruit112358]

Hello,

How can I know the color of every line in a time series chart?

I know how to set the color by setSeriesPaint(), but I do not know how to get default color of all lines in time series chart without custom setting.

Any idea?

Jie

[paradoxoff]

If a renderer renders a data item of a series, and the paint for the series has not yet been specified, the renderer will ask a "drawing supplier" for the next paint (check AbstractRenderer.lookupSeriesPaint(int series) which is calling the abstract method getDrawingSupplier()). A renderer extending AbstractXYItemRenderer will return the DrawingSupplier of the XYPlot (see AbstractXYItemRenderer.getDrawingSupplier()) . By default, an XYPlot uses an instance of DefaultDrawingSupplier.
A DefaultDrawingSupplier will simply iterate over a list of predefined colors. You can check what colors are being used by looking at the source of DefaultDrawingSupplier.
If you need to control that behaviour, and if you do not want to set all colors explicitly, you can use an instance of DefaultDrawingSupplier and define the colors, shapes, strokes etc. in the constructor, or you can implement that interface on your own. In any case, call XYPlot.setDrawingSupplier(DrawingSupplier yourSupplier) before you draw the chart.

[fruit112358]

Thank you very much and the problem is solved:)

However, I found another interesting place. When I set legend of a chart to be visible, the sequence of lines' color is inverted compared with chart with invisible legend.

For example, for the same dataset with three series, their colors are red, blue and green when legend is not visible. However, when legend is visible, order of colors is changed to green, blue and red.

Although this do not effect my application, I still want to know the reason, does anyone have idea?

Jie

[paradoxoff]

Does is go away when you call

Code: Select all

xyplot.setSeriesRenderingOrder(SeriesRenderingOrder.FORWARD);

[aherz]

Hi,

I happened to run into the same problem.
Calling
xyplot.setSeriesRenderingOrder(SeriesRenderingOrder.FORWARD)

indeed fixed the problem of inverted color order (when drawing either with or without legend). Although, I would have expected that as default behavior (always same order unless explicitly specified otherwise).

Regards,
Alex