add helper functions moveToCenterOfElement and moveToCenterOfBounds

[Illyism]

const DOMElemRef = document.querySelector('.some-element')
moveToCenterOfElement(DOMElemRef) // moves viewport to the center of this element

const elemBounds = document.querySelector('.some-element').getBoundingClientRect()
moveToCenterOfBounds(elemBounds) // moves viewport to the center of this bounding box

moveToCenterOfBounds is useful to have separately so you can pass just the bounding box around. Or make your own one without having to use HTML, eg moveToCenterOfBounds({ left: 0, top: 0, width: 100, height: 100 })

[savtwo]

@anvaka This is very helpful. Any chance it can be merged?

[anvaka]

I'm not sure I understand this math can you please help?

😊

[anvaka]

is element part of the nested tree?

Note: panzoom works not only with dom elements, but also with canvas/svg/webgl - having element passed directly like this would likely make the API less generic. Ideal solution would delegate this logic into domController or svgController

Also note: panzoom uses older version of ES language. Having consts, destructuring, default values would break the minifier

[Jasonvdlee]

@anvaka I need this too.