Stacked area problem
lazarus / 55-TAChart

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loopbreaker · 2015-04-11 16:52

it looks like there is a problem in area series:
Always wrong stacking (not from same index) if chart is zoomed.
This can also be seen in multidemo after zooming.

I have an idea, could someone check this:
procedure drawSegment(AStart, AEnd: Integer);
replace "UpdateGraphPoints(j - 1, AStart, AEnd)"
with "UpdateGraphPoints(j - 1)"
The latter uses FLoBound, FUpBound

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wp · 2015-04-11 17:17

Seems that the stacked chart in multidemo zooms correctly here (Laz
trunk, fpc 2.6.4, Win). Please be more specific. Which version of
Lazarus/fpc are you using, which operating system?

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loopbreaker · 2015-04-11 17:33

Quote from: wp on April 11, 2015, 07:17:37 pmSeems that the stacked
chart in multidemo zooms correctly here (Laz trunk, fpc 2.6.4, Win).
Please be more specific.

Hi, the effect is easier seen if percentage = true,
the sum should be always 100% in the correct case.
The bottom stack segment uses data range [FLoBound, FUpBound],
the upper segments use data range [AStart, AEnd], this is not
compatible,
leads to wrong sums (totals) - a single sum uses different data
indices,
but should use the same index.

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wp · 2015-04-11 17:53

Ah, I see, thank you. Fixed in r48728 (will go into v1.4)