Use canvas instead of SVG for trace mini-map

[tiffon]

To improve performance on traces with many spans, use the canvas API to render the trace mini-map instead of SVG elements.

[NeoCN]

@tiffon tested on Google Chrome 61.0.3163.91 and Apple Safari 10.1.2 (12603.3.8), got the same result like the following image, the trace mini-map is blur

[tiffon]

@NeoCN Thanks for reporting this. I'll work on this under a separate ticket. Will keep you posted. On Sep 18, 2017 10:36 PM, "NeoCN" <notifications@github.com> wrote: @tiffon <https://github.com/tiffon> I got this render result after merge this [image: jietu20170919-101712] <https://user-images.githubusercontent.com/1180502/30573053-2fb827e0-9cb7-11e7-972d-f71dda714ede.png> — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <https://github.com/uber/jaeger-ui/issues/61#issuecomment-330411067>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ACMpUSsaGHUJ5JyPLkskuheT5DWgYrXGks5sjyiogaJpZM4O9QYR> .

[tiffon]

@NeoCN I created #76 to track this. Thanks for reporting!