Flow Line Development -- Thresholds: Color and Line Style
Bug Number: n/a
Release notes (y/n): no (not yet)
For Release Nums: 6.7

Task 1 in this project document is provisionally complete:
  Output Canvas / Flow Lines Development Plan / February 2015
  http://cadswes2.colorado.edu/~philw/2015/OutputCanvas/FlowLines/FlowLinesDevPlan-Feb2015.html

This includes the following major feature change and addition:
 (1) Flow Line Structure and Creation is based on Slots rather than Objects
 (2) Flow Line color and style indicate values exceeding user-defined 
      thresholds.

Up to nine (9) distinct value intervals for individual slots can be assigned 
distinct line colors and styles (e.g. solid, dotted, dashed).  The colors and 
styles for those nine intervals are defined at the Flow Line Group level.  
But the "threshold values" between those intervals (up to eight thresholds) 
are defined independently for each Flow Line instance.

This screenshot illustrates the interval configuration user interface, 
defined at the Group level:
http://cadswes2.colorado.edu/~philw/2015/OutputCanvas/FlowLines/2015-02-18/EditIntervalAttributes.png

Here is the interval display attribute configuration serialization for 
that example:

  <FlowIntervalAttribList>\
    <FlowIntervalAttribs label="Base" color="#000000" lineStyle="DashLine"/>\
    <FlowIntervalAttribs label="Intv One" color="#000099" lineStyle="SolidLine"/>\
    <FlowIntervalAttribs label="PURPLE" color="#9008ff" lineStyle="SolidLine"/>\
    <FlowIntervalAttribs label="Intv Two" color="#009900" lineStyle="SolidLine"/>\
    <FlowIntervalAttribs label="Intv Three" color="#990000" lineStyle="SolidLine"/>\
  </FlowIntervalAttribList>\

The threshold values defined at the Flow Line instance level are direct 
rwSettings on the Flow Line. (This provision required that we limited the 
number of intervals to a known constant).

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