TAChart: Add and AddXY methods
lazarus / 55-TAChart

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wp · 2011-10-19 12:52

Being a lazy person I would appreciate if the parameters of the
TSeries Add and AddXY methods would have default values, i.e. it
should be possible to call

Code: [Select]LineSeries1.AddXY(x,y,name)

instead of

Code: [Select]LineSeries1.AddXY(x,y,name,LineSeries.SeriesColor);


The same for the other series accordingly.

BTW: The multi-valued series (e.g. Box and Whisker series etc.) take
advantage of the YList of the source. Having an additonal overloaded
AddXY method with all required parameters would facilitate calling
with the correct count and order of parameters by means of code
completion:

Code: [Select]function TBoxAndWhiskerSeries.AddXY(x,
LWhisker,LBox,y,UBox,UWhisker:double) : integer; overload;

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Ask · 2011-10-19 15:04

Quoteparameters of the TSeries Add and AddXY methods would have
default values
I am actually unsure if it would be better to continue advertising
series' Add/AddXY
method or to refer users to the ListSource instead.
Anyway, added defaults in r32984.
(Note that the default color is clTAColor constant, not the
Series.Color, since in the latter
case the point will keep the color even if the Series.Color values
changes, which it should not do by default).

QuoteTBoxAndWhiskerSeries.AddXY
I generally agree, but since I am not actually using "complex" multi-
series myself,
it is hard for me to judge the preferred API.
Does your code actually have a place where you'd call this version of
AddXY?
Should it also include label/color parameters like original AddXY?
Maybe a general AddXYList(x, y: array of const) would be useful
also/instead?
Should the order of y values be user-controllable, like in
TOpenHighLowCloseSeries?

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wp · 2011-10-19 15:57

QuoteAnyway, added defaults in r32984.
Thank you

QuoteI am not actually using "complex" multi-series myself
Actually I don't use these series either. The posting came to my mind
because I am planning to write an ErrorbarSeries which will allow
drawing error bars in x and/or y directions. The error values will be
stored in the YList, and I just though it might be easier for the user
to have a single call where everything is passed at once.

QuoteShould it also include label/color parameters like original
AddXY?
Why not?

QuoteI am actually unsure if it would be better to continue
advertising series' Add/AddXY
method or to refer users to the ListSource instead.
I think having Add/AddXY as a method of the series helps when coming
from Delphi although I have to admit that the advantages of working
with the ListSource are buried to some degree.

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Ask · 2011-10-22 18:19

Added overload for box-and-whiskers as well as more general
AddXY(x, y, ylist) overload in r33026-33027.