determining legend height

[alfonso]

I am making a timechart from previously unknown data. Sometimes there are 2 series, sometimes there are 20. Is it somehow possible to get the legend height? I got 0.0 anytime. I want to keep the same chart dimensions, independent form the legend height. it should be like that:

chart_height = DEFINED_CHART_HEIGHT + LEGEND_HEIGHT

but how to determine legend height?

ChartUtilities.saveChartAsPNG(..., chart, chart_width, chart_height).

Can anyone help?

ps. I am using jFreeChart 1.0rc

[david.gilbert]

It is generally not very easy to do this, because JFreeChart was designed to draw everything within the space allocated to it. You might be able to hack something using the arrange() method in the LegendTitle class (which returns the legend size, for given constraints). Once you know the legend size, you could increase the height of the chart by that amount. In theory that should work...I don't know what problems you'll run into in practice.

[alfonso]

Thank you very much for quick reply.

Code: Select all

Size2D size = chart.getLegend().arrange((Graphics2D) bfi.getGraphics(),
                     new RectangleConstraint(chartDimX, chartDimY));

No problems encountered.

Code: Select all

size.height

gives exact height of the legend, so I managed to solve my problem.

Best Regards,
alfonso

[david.gilbert]

Great! I'm glad it worked.

[BigDong]

Hey alfonso I am also interested by your code

What's bfi in : (Graphics2D) bfi.getGraphics() ?

How did you cast/convert your JFreeChart img to a graphics2d ?