Drawing back-ends for TAChart?
lazarus / 55-TAChart

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jwdietrich · 2012-05-13 23:01

What are the required steps to register a drawer for a chart?

This option is mentioned at the documentation wiki article and there
is a reference to an SVG example, but I cannot find any details (nor
the SVG demo).

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Ask · 2012-05-14 07:53

If you want to *register* your own drawer, you should create a class
implementing IChartDrawer interface.

If you just want to use an existing drawer, you should include
corresponding unit in the "uses" clause,
create an object of the drawer class, and pass it to the TChart.Draw
procedure.
Like this: https://github.com/graemeg/lazarus/blob/upstream/components
/tachart/demo/save/main.pas#L93

QuoteI cannot find any details (nor the SVG demoIt was a mistake in
the docs, SVG is in the "save" demo. I fixed the wiki.

By the way, make sure you have the latest Lazarus (1.0 or trunk) I do
not remember exactly which part
of the functionality is present in earlier versions.

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jwdietrich · 2012-05-14 10:09

Thank you, the "save" example is very perspicuous.