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List:       haiku-bugs
Subject:    [haiku-bugs] Re: [Haiku] #12383: FillTrangle produces slightly different results if drawn in a BPict
From:       "Haiku" <trac () haiku-os ! org>
Date:       2018-08-30 11:59:12
Message-ID: 061.7403a25ac4bb9056a0d836a72ae670e3 () haiku-os ! org
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#12383: FillTrangle produces slightly different results if drawn in a BPict=
ure
----------------------------------+----------------------------
   Reporter:  jackburton          |      Owner:  nobody
       Type:  bug                 |     Status:  assigned
   Priority:  low                 |  Milestone:  Unscheduled
  Component:  Servers/app_server  |    Version:  R1/Development
 Resolution:                      |   Keywords:
 Blocked By:                      |   Blocking:
Has a Patch:  0                   |   Platform:  All
----------------------------------+----------------------------

Comment (by jackburton):

 I've noticed that Painter::_DrawTriangle() (which is called for the
 fill_triangle op), aligns the points using the "_Align()" function with
 the "centerOffset" parameter set to true, while Painter::DrawPolygon()
 (called for the fill_polygon op) calls _Align() with the centerOffset
 parameter set to false.
 _Align(), if centerOffset is set to true, increments the point coordinates
 by 0.5.
 I don't know which one is correct, but it's what's causing this bug.

-- =

Ticket URL: <https://dev.haiku-os.org/ticket/12383#comment:3>
Haiku <https://dev.haiku-os.org>
The Haiku operating system.

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