68 lines
1.7 KiB
TypeScript
68 lines
1.7 KiB
TypeScript
import { useRef } from 'react'
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import state from 'state'
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import inputs from 'state/inputs'
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import vec from 'utils/vec'
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import { useGesture } from 'react-use-gesture'
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import { fastPanUpdate, fastPinchCamera, fastZoomUpdate } from 'state/hacks'
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/**
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* Capture zoom gestures (pinches, wheels and pans) and send to the state.
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* @param ref
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* @returns
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*/
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export default function useZoomEvents() {
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const rPinchDa = useRef<number[] | undefined>(undefined)
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const rPinchPoint = useRef<number[] | undefined>(undefined)
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useGesture(
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{
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onWheel: ({ event, delta }) => {
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if (event.ctrlKey) {
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const { point } = inputs.wheel(event as WheelEvent)
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fastZoomUpdate(point, delta[1])
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return
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}
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if (state.isInAny('pointing', 'drawing')) {
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fastPanUpdate(delta)
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return
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}
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state.send('PANNED_CAMERA', {
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delta,
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...inputs.wheel(event as WheelEvent),
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})
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},
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onPinch: ({ pinching, da, origin }) => {
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if (!pinching) {
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state.send('STOPPED_PINCHING')
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rPinchDa.current = undefined
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rPinchPoint.current = undefined
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return
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}
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if (rPinchPoint.current === undefined) {
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state.send('STARTED_PINCHING')
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rPinchDa.current = da
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rPinchPoint.current = origin
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}
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const [distanceDelta, angleDelta] = vec.sub(rPinchDa.current, da)
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fastPinchCamera(
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origin,
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vec.sub(rPinchPoint.current, origin),
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distanceDelta,
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angleDelta
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)
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rPinchDa.current = da
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rPinchPoint.current = origin
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},
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},
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{
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domTarget: document.body,
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eventOptions: { passive: false },
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}
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)
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}
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