order of plotting series
lazarus / 55-TAChart

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mtanner · 2018-08-30 07:23

By order I mean which series appears on top of another series, not the
order of points within a series. I have a chart with an area series
(filled) and a line series. I  want the line to appear on top of the
area, but I'm not clear how to do this. Is it controlled by the order
of definition or activation of the series, or is there a parameter to
control this?APPEAR

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howardpc · 2018-08-30 07:32

Each series has a ZPosition property.
The series are drawn in order of deceasing ZPosition value.
So set the series' ZPosition to 0 for the one you want to be on top,
and the one immediately below to 1, etc. depending how many series you
have showing on the chart.
What TAChart calls ZPosition is more often termed "z order".

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mtanner · 2018-08-30 08:41

Thanks, although I think you mis-stated the rule. When I try it Z=1
appears over the top of Z=0.

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wp · 2018-08-30 08:50

ZPosition is correct. But it defines the order in which the elements
(series, axes, etc) are drawn. The drawing order is from smallest to
highest. Consider Z as a coordinate increasing from the screen towards
you. So, if you want a particular series to be on top of another one
give it the larger ZPosition.

I would not used 0: Elements with ZPosition are drawn in the order in
which they were created.