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Thread: Bar chart colors dynamically changed based on data value. Along with JavaScript vars

  1. #11


    Another question, this is kinda a more in depth usecase for this scenario.

    So I can now return different colors based on the data values, but I just learned that sometimes these are not standard across the board. For instance the bars may have different cuttoffs.

    Bar 1: green = 0-2, yellow = 2.1-4, red = 4.1-6.0
    Bar 2: green = 0-1.5, yellow = 1.6-3.8 red = 3.9-6.0
    Bar 3: green = 6.0-4.0, yellow = 3.9-2.0, green = 1.9-0

    I feel like this would be easy for me to do if I could get the xaxis label for each bar, and than based on the name I would know how to evaluate the data. The problem is that I cannot for the life of me find the variable that would contain these labels. Any ideas?

  2. #12
    Join Date
    Jul 2007


    That's in something like this.scene.series
    Pedro Alves
    Meet us on ##pentaho, a FreeNode irc channel

  3. #13


    thanks for the direction, but am I missing something totally obvious? I am fairly new to Pentaho and saying something like "this.scene.series" means absolutely nothing to me at this point mostly because I dont know where to go from there. Is there any documentation where I could find more information about what this.scene.series contains? Its attributes and stuff, sort of like a javadocs. I feel like many people on this forum know a bunch of different variables to play around with in these things and I am always just lost with them.

  4. #14
    Join Date
    Mar 2012



    you can find some information about the scene structure here.

    Generally, when executing code in an extension point, you have a "scene" argument, that is the same as «this.scene».

    The scene contains a map of variables, named "vars", so you write «this.scene.vars».

    Variables are generally named after the visual roles of each chart type, so you'll have a "series" variable, a "category" variable, a "value" variable, for a typical categorical chart.

    A variable is itself an object cause you have, at the minimum, the variable's "value" and the variable's "label".

    So, summing it all up, for accessing the series value in an extension point, you write: «this.scene.vars.series.value».

    We're working on some sugar functions, accessible from «this» to make your and our wrists type less.

    Edit 2013-10-23: Added to master of CDF and CGG new sugar methods for this end.

    You can now use the following, from the pvc.visual.Context or the pvc.visual.Scene, to obtain the value of scene variables:

    • most charts (except, notably, the Pie chart): getSeries()
    • categorical charts: getCategory()
    • categorical charts and the legend scenes: getValue()
    • metric charts: getX(), getY()
    • cartesian axes panel scenes: getTick()

    There are also getSeriesLabel(), getCategoryLabel(), etc., versions of all these.

    For those variables/visual-roles for which no sugar method exist, or if you prefer/need a more dynamic approach, the new "get" method can be used as in the following example:
    • get("category") <=> getCategory()
    • get("category", "label") <=> getCategoryLabel()
    Last edited by duarte.leao; 04-10-2014 at 01:56 PM.

  5. #15


    Thanks, this post has been extremely helpful and I was able to get it to work using the vars.category.label. Thanks again!

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