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Title: qt backend has more draws than necessary by jrevans · Pull Request #4943 · matplotlib/matplotlib · GitHub

Open Graph Title: qt backend has more draws than necessary by jrevans · Pull Request #4943 · matplotlib/matplotlib

X Title: qt backend has more draws than necessary by jrevans · Pull Request #4943 · matplotlib/matplotlib

Description: Sometimes (such as at widget creation), Qt tries to paint itself before matplotlib has called 'draw'. It seems like someone the Agg draw here to solve this problem. We cannot and should not call this every time Qt wants to paint itself. That costs a huge hit in performance because then matplotlib would be refreshing the Agg backend twice for every call to 'draw'. This fixes it so that if Qt tries to paint itself before the Agg buffers have been updated, then it will cause Agg to update itself first. This addresses an issue in #4897.

Open Graph Description: Sometimes (such as at widget creation), Qt tries to paint itself before matplotlib has called 'draw'. It seems like someone the Agg draw here to solve this problem. We cannot and should n...

X Description: Sometimes (such as at widget creation), Qt tries to paint itself before matplotlib has called 'draw'. It seems like someone the Agg draw here to solve this problem. We cannot and ...

Opengraph URL: https://github.com/matplotlib/matplotlib/pull/4943

X: @github

direct link

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qt backend has more draws than necessary https://github.com/matplotlib/matplotlib/pull/4943/files#top
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c00bef1 Removed an extra matplotlib draw that was happening on every paintEvent. Aug 17, 2015 https://github.com/matplotlib/matplotlib/pull/4943/commits/c00bef1a4f2222a9e85665b2643c795cf6f566af
fb2e928 Updated to follow mpl style rules. Aug 17, 2015 https://github.com/matplotlib/matplotlib/pull/4943/commits/fb2e9286e6867f29dbfe576fdf250d0945e1dbad
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