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  1. Qt
  2. QTBUG-31579

[REG]: QPainter::drawPolyline() will draw a polygon incorrectly in some cases if a pen width is 0 or 1.

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    • qtbase 319cbb7597100f3b65792dc6a0ce2885ce6c0e8c 4.8 6c3b032693acf86a894a8ea3a30c937a1d08ed7f

    Description

      With the attached example if you compare the output to what you get in 5.0.x and 4.8.x then you will see that the two lines should appear in the same place, whereas in Qt 5.1.0 and 4.8.5 the red one is a diagonal.

      This is a regression against Qt 5.0.2 and Qt 4.8.4.

      Attachments

        1. main.cpp
          0.7 kB
        2. main5.cpp
          0.7 kB
        3. main6.cpp
          1 kB

        Issue Links

          resulted in

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-33512 [REG]: Incorrect polygon rendering in 4.8.5

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed
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            People

              vgt Eirik Aavitsland
              andysh Andy Shaw
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              Dates

                Created:
                Updated:
                Resolved: