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Franz
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Support for selecting and highlighting chart regions
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We would like to adapt the xamDataChart control so that the user can highlight regions of the chart. In some kind the function is similar to the zoom / pan function, but instead of panning / zooming the selected region should be shown a little different (e.g. alpha-blended). The function should allow to select a specific region of the X-Axis, Y-Axis selection is not needed so the whole height of the plot can be used.

After looking at the source I think that re-using the zoom / pan thing would not be the best way and instead developing something new here is the better way.  My plan is:

  • Adding a path which represents the selected are
  • Registering for MouseLeftButtonDown, MouseMove and MouseLeftButtonUp which trigger the selection
  • Updating the added path upon a mouve move
  • Calling a custom event handler after the selection is finished

Now I have some questions:

  1. How do get access to the PlotAreaBorder from outside. Is the PlotAreaBackgroundContent right?
  2. How do I get the dimensions of the plot. Again: Is PlotAreaBackgroundContent right?
  3. How do I highlight the selected region afterwards. I thought about re-using the info-strips from the samples but these are in the background (meaning that the plot is in front of it). Or would I need to add a custom UI element such as a path which is used for the highlighting?

Kind regards

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    cgrill said:
    How do get access to the PlotAreaBorder from outside. Is the PlotAreaBackgroundContent right?

    I'm not sure what you mean by PlotAreaBorder.  Do you want to apply a border brush to the PlotArea?  If so, yes, you can assign a Border element to the PlotAreaBackgroundContent.

    cgrill said:
    How do I get the dimensions of the plot. Again: Is PlotAreaBackgroundContent right?

    If you assign something to the PlotAreaBackgroundContent, its bounds should match up with the dimensions of the plot.  Or, you can use the ViewportRect property.

    cgrill said:
    How do I highlight the selected region afterwards. I thought about re-using the info-strips from the samples but these are in the background (meaning that the plot is in front of it). Or would I need to add a custom UI element such as a path which is used for the highlighting?

    There are a number of ways to do this, but I would recommend writing a custom series for this purpose.

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