Diffa Diffa → 0.8

Comments and changes to this ticket

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  Jonathan Lister September 29th, 2010 @ 12:58 AM

  • State changed from “new” to “open”
  • Milestone order changed from “4” to “0”

  Let's start with expanding or contracting by a factor of 2. Adding buttons to try.

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  Jonathan Lister September 29th, 2010 @ 01:36 AM

  Three ways of doing this:

  1. zoom all the elements (as this Raphael plugin does: http://github.com/wout/raphael-zoom)
     
  2. use the viewBox attr of the main SVG element - this does not work in IE (VML has no viewBox attr?)
     
  3. for IE, use the zoom attribute, see this thread: http://groups.google.com/group/raphaeljs/browse_thread/thread/811b0...

  Going to try out 3.

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  Jonathan Lister September 29th, 2010 @ 01:44 AM

  3 is cool, but it is zooming the labels as well as the x-axis. Didn't think about that... so I need to be more specific about what I want from zooming:

  • x-axis timescale zooms, altering the labels on the x-axis
  • blobs are recalculated based on the different window of time represented by one increment on the x-axis

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  Jonathan Lister September 29th, 2010 @ 02:29 AM

  • State changed from “open” to “resolved”

  I've done a two-level zoom, which you switch between with zoom buttons:
  http://img.skitch.com/20100929-bqsu64h9383dtiwb7yhtr16hna.jpg

  Things to watch out for:

  • when removing old elements, remove their events handlers first to make sure memory leaks don't pop up
  • need to add the last data point in at the end if there are an odd number of data points (as we're merging each pair together and the presence of "NOW" means there's always an odd number of x-axis increments) - you can see on the screenshot above how the last data point is missing
  • supporting more than two zoom levels would require calculating the new data points and x-axis points given a value for the zoom level
  • you couldn't zoom out beyond the default zoom level at this point -- if you wanted to do that using this same technique (say you had a load of points off screen) you would want to treat the default zoom as an intermediary zoom level
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  Ben Hood October 28th, 2010 @ 04:24 PM

  • State changed from “resolved” to “closed”

  [bulk edit]