On Thu, Dec 5, 2019 at 7:30 AM Thorsten Behrens <thb@xxxxxxxxxxxxxxx> wrote:
Hey Chris,
Chris Sherlock wrote:
> I’m trying to work out how to implement the SETMETERLIMIT EMF record.
>
> Can anyone point me to the spot where we implement bevelling?
>
We discussed on IRC earlier this week, below the log for reference -
did that solve the question for you?
chris_wot: thorsten! hey, can you help me out?
chris_wot: do you know what does line mitering?
chris_wot: is it in basegfx?
quikee[m]: the vcl polyline accepts miter limit as an parameter
thorsten: yep, fwict the method noelgrandin gave does that
***chris_wot relooks at the code
chris_wot: you mean basegfx/source/polygon/b2dlinegeometry.cxx ?
thorsten: yep
chris_wot: thorsten how do I set the miter limit though?
thorsten: chris_wot: see vcl/headless/svpgdi.cxx: // convert miter minimum angle to miter limit for how to convert between the two related ways to express that
chris_wot: legend
chris_wot: thorsten is it the line double fMiterLimit = 1.0 / sin( fMiterMinimumAngle / 2.0);
chris_wot: as I want to do this indepently of the angle
chris_wot: which is what SETMITERLIMIT does...
chris_wot: thorsten something like this - https://www.partnersoftware.com/documentation/MP/v4.5.26/mp_wblegendlinestylemiterlimit.png
thorsten: chris_wot: indeed, that's the concept
Cheers,
-- Thorsten
That was helpful, but it didn't tell me how to get the meter limit independently of the angle.
I think that I will need to probably to add another miter limit parameter to createAreaGeometryForJoin() and then introduce an isosceles trapezoid instead of a triangle for the miter.
This is because you can actually specify the miter length, however, the example given doesn't show how just call on a basegfx function to produce a bevelled join based on the miter length itself - I did look for something that handles this but couldn't find anything.
Chris
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