Export zoomRect and make it more configurable #659
Merged
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As discussed in #608, normal zooming supports customizing zoom behavior using zoomFunctions, but the drag-to-zoom functionality that's implemented by zoomRect bypasses zoomFunctions and calls updateRange correctly.
I have a custom scale implementation that relies on zoomFunctions, so trying to enable drag-to-zoom causes problems. (Specifically, I'm breaking up the axis into viewports so that I can stack multiple series within this chart - somewhat like this example. The scales for the individual portions of the chart shouldn't be directly zoomed, because their layout is managed by a separate, controlling scale, so their zoomFunctions are no-ops.)
Zooming by rectangle appears to be a distinctly different interface than zooming by percentage and focal point, so this PR adds a zoomRectFunctions to let scales customize that behavior and cover this use case.
I'm also now exposing zoomRect as part of the public API, like zoom and zoomScale.