Have you tried something this: 100+(15/39)*(140-100)
100 being Jan 1 balance
140 being Feb 8 balance
15 being the number of days from the first data provider date point
39 being the total number of days between the first and second data
provider date points
That should give you the y balance for the widget.
Aaron
Ryan wrote:
I've got a line chart showing a dollar value over time. Think of it as
the balance of a savings account. It goes up and down every month or
so. What I'm trying to do is overlay little widgets on top of that
line on the chart to represent events that may or may not have
affected the line's value. This is actually similar to the Yahoo
Finance stock chart with the event overlays.
Anyway, it's easy enough to add a CartesianDataCanvas as an annotation
element to my line chart and then add children to it. It has a nice
little addDataChild method that allows you to specify an x axis value
and a y axis value and it figures out what the corresponding x and y
coordinates are and places the child there. Great so far.
Say my line series data provider looks like this:
{date:new Date(2009, 1, 1), balance:100}
{date:new Date(2009, 2, 8), balance:140}
{date:new Date(2009, 3, 5), balance:95}
If I have an event for 1/1/2009, I can look up that the balance was
100 on that day and place the event widget at [1/1/2009, 100].
However, if I have an event on 1/15/2009, from looking at the data
provider above, I know that the balance was still 100, but because the
line is diagonally vectoring towards the next value of 140, my data
point is misplaced if I put it at [1/15/2009, 100].
Is there a way to get the line's y value given an x value?
or
Can I change my line chart to not draw diagonal lines and instead draw
square lines so I won't have this problem?
Ryan
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