Trace viewer clips rectangles when zooming in

[picksi]

If the rectangles used to displayed data in Trace Viewer get too large (generally from zooming) they stop rendering. This is very noticeable in counters (e.g. memory-use data) but also occurs when zooming in on tasks.

Any fix needs to be aware of potential performance impact - there can be a large number of items being rendered and the GUI needs to remain usable.

[dj2]

This can also be seen with instant events where they disappear as you zoom in.

[petrcermak]

#633 fixed this bug only for counter tracks. Clipping still occurs on other tracks (when zoomed in).

[dj2]

Sorry, autoclosed when I submitted the pull request. Re-opened.

[petrcermak]

No problem. It seems that this issue could be solved completely by drawing the plot manually (call dt.xWorldToView(x) repeatedly) rather than using transforms (call dt.applyTransformToCanvas(ctx) once). While the change appears to have no impact on performance when applied to counter tracks, someone would need to confirm this for the other tracks as well.

[catapult-bot]

Migrated to catapult-project/catapult#625