| Custom Axes and Line Plotting in the Chart API [message #1301196] |
Fri, 18 April 2014 02:03 |
 Wyatt Spear
Messages: 10
Registered: July 2009 |
Junior Member |
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Greetings. I'm using BIRT's charting API to visualize some data with some unusual requirements and I haven't yet found obvious approaches in the example plugins. My initial run at this is based on a modified stacked line chart but there are two significant differences I need to figure out.
First, my x axis is numerical but I need it scaled so the points are, for example,
1/4 - 1/2 - 1 - 2 - 4 - 8 - 16
With equal spacing between each. I can set this up as a category axis but my data can show up anywhere along that scale so a discrete number of categories won't work. As a bonus question, is there a way to show the fraction (1/4) rather than the decimal (.25) in a numeric axis's labels?
Second, I need to be able to display line charts for series that have just a couple points which may be anywhere along the x axis. If I work with categories that means non-continuous data, so the lines must continue smoothly between defined points, skipping the undefined points. I really need to be able to graph lines between arbitrary points on the plane but I don't see a way in the API. Any suggestions or pointers to more examples or resources would be greatly appreciated.
Thanks,
Wyatt
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