[cairo] Drawing a thick path sans stroke()
donn.ingle at gmail.com
Fri Feb 12 00:35:18 PST 2010
I want to draw paths (curves and lines) without using strokes, but I
want them to have a width (from 1 upwards) -- in other words, I need to
draw a path from A to B and then turn at right angles, draw a thickness,
and then draw back along the same path and close.
Call it an outline of a thick curve -- which would then be filled by
My brain and maths just don't share the same space. I have been scraping
the tubes and all I see is a bunch of stuff that ruffles my hair as it
flies over my head.
I can't figure out how to determine what angle to turn at from a point
at the end of a line (or curve) that makes a nice "T" right-angle turn.
If I draw a curve by hand, my hand has no trouble drawing a line that
satisfies me, but I don't know how I do it!
Could anyone point me in the right direction?
BTW - I need this because I am working in Clutter and using their cogl
path thing. They do have a stroke() but it can't be wider than 1px (and
it crashes on pyClutter for some reason.) Their cogl API is alike to
Cairo, so I am asking here. Also, I will be moving from cogl to cairo
and back again all the time. cogl draws the 'pick' area (for hit
testing) and cairo will draw the visible paths.
Fonty Python and Things! -- http://otherwise.relics.co.za/wiki/Software
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