Home » Developing U++ » UppHub » PlotCtrl
| Re: PlotCtrl [message #23517 is a reply to message #22884] |
Mon, 26 October 2009 09:22  |
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mirek
Messages: 14256
Registered: November 2005
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Ultimate Member |
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| pveach1 wrote on Mon, 24 August 2009 13:28 |
I would like to see this project expanded into a general charting library. It has a lot of potential especially when combined with the new headless drawing capabilities.
Google has an online charting service. But if they change it, a lot of programs will break.
One of the more confusing things is setting coordinate transformation/translation. I am currently using Win32 API to set xformations. Like this:
XFORM xm_ = { 1, 0, 0, -1, FLOAT(size.cx -100), FLOAT(Offset + size.cy+50)};
HDC hdc = w.GetHandle();
SetGraphicsMode ( hdc, GM_ADVANCED );
SetWorldTransform ( hdc, & xm );
// do something
SetWorldTransform ( hdc, & xm_default ) ; // restore coordinates
This is only valid for WIN2k or later.
I am unsure how U++ draw does xforms.
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Any plotting package IMHO should use Painter.
See PainterExamples, that is selfexplaining code covering all details, including transformation matrices.
Mirek
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