[SOLVED] Two series overwriting; labels overwriting points
lazarus / 55-TAChart

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trev · 2021-01-21 07:31

1. My CPU temperature series is overwriting my fan RPM series - is
there a way to avoid this?

2. My CPU point labels are overwriting my point triangles - is their a
way to avoid this?

See attached chart pic.

(Be gentle - it's the first time I've used TAchart

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wp · 2021-01-21 09:02

To begin with: TAChart has no built-in mechanism to detect overlapping
series labels between series. But you have some options to control
label positioning:
Play with the MarkPositions property of each series. When the values
of the first series are consistently displayed higher than the values
of the second series you could set the MarkPositions of the first
series to lmpPositive which will draw all labels of this series above
the data points, and you could set the MarkPositions of the second
series to lmpNegative which will draw these labels below the data
points. You can also adjust the Marks.Distance for both series which
is the distance between label and data point.Use a paned presentation
of the data, i.e. show the first series in the upper, and the second
series in the lower half of the chart. There are tutorials in the wiki
on how to achieve this effect.Do not use chart labels at all. My
favorite since it avoids the chart to becomes too crowded. If you
absolutely need to know the exact value of a data point you can use a
TDataPointHintTool which displays the desired information in a popup
window when the mouse is moved over this point.

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trev · 2021-01-21 11:00

I tried the TDataPointHintTool but every hint is obscured by the
cursor pointer, so I went with a paned presentation of the data.

Thanks!

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wp · 2021-01-21 11:06

Quote from: trev on January 21, 2021, 12:00:48 pmI tried the
TDataPointHintTool but every hint is obscured by the cursor pointer
You can use the OnHintLocation event of the HintTool to move the hint
window relative to the cursor.