Re: Issue 1978 in google-visualization-api-issues: Bug: No tooltip appears for (covered) stepped area when used with Combo Chart

[google-visualiz...@googlecode.com]

Updates:
Summary: Bug: No tooltip appears for (covered) stepped area when used with
Combo Chart

Comment #1 on issue 1978 by dlalibe...@google.com: Bug: No tooltip appears
for (covered) stepped area when used with Combo Chart
https://code.google.com/p/google-visualization-api-issues/issues/detail?id=1978

The problem is not that stepped areas don't support tooltips, but that one
stepped area can cover up others, so the mouse is only seen for the
top-most layer. The same is true of 'area' as well. The series are drawn
in order from lowest column index to highest, with the higher numbered
columns potentially covering up lower numbered columns.

It is conceivable that we could draw the stepped areas in order from the
largest to the smallest, regardless of the column order, so the smallest
are always on top, but it would be problematic where values within a series
cross the values in another series. We would have to figure out where they
intersect and draw subdivided elements in the right order.

Another way to deal with this is to always draw the line at the top of
areas on top of areas, so they are never covered by areas. This could
work, except all lines would always be visible even if the opacity of
covering areas is such that you could not see the covered areas.

So this is problematic at best. We are open to suggestions for how to
better deal with this.

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