2021-05-09 13:04:42 +00:00
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import React, { useEffect, useRef } from "react"
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import state from "state"
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2021-05-13 08:34:56 +00:00
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import inputs from "state/inputs"
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2021-05-09 13:04:42 +00:00
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import * as vec from "utils/vec"
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2021-05-28 13:08:51 +00:00
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import { usePinch } from "react-use-gesture"
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2021-05-09 13:04:42 +00:00
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2021-05-09 21:22:25 +00:00
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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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2021-05-09 13:04:42 +00:00
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export default function useZoomEvents(
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ref: React.MutableRefObject<SVGSVGElement>
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) {
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const rTouchDist = useRef(0)
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useEffect(() => {
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const element = ref.current
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if (!element) return
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function handleWheel(e: WheelEvent) {
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e.preventDefault()
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if (e.ctrlKey) {
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state.send("ZOOMED_CAMERA", {
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delta: e.deltaY,
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...inputs.wheel(e),
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})
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return
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}
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state.send("PANNED_CAMERA", {
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delta: [e.deltaX, e.deltaY],
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...inputs.wheel(e),
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})
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}
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function handleTouchMove(e: TouchEvent) {
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e.preventDefault()
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if (e.touches.length === 2) {
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const { clientX: x0, clientY: y0 } = e.touches[0]
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const { clientX: x1, clientY: y1 } = e.touches[1]
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const dist = vec.dist([x0, y0], [x1, y1])
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const point = vec.med([x0, y0], [x1, y1])
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2021-05-09 21:22:25 +00:00
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state.send("WHEELED", {
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delta: dist - rTouchDist.current,
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point,
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})
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rTouchDist.current = dist
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}
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}
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element.addEventListener("wheel", handleWheel)
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element.addEventListener("touchstart", handleTouchMove)
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element.addEventListener("touchmove", handleTouchMove)
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return () => {
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element.removeEventListener("wheel", handleWheel)
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element.removeEventListener("touchstart", handleTouchMove)
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element.removeEventListener("touchmove", handleTouchMove)
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}
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}, [ref])
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2021-05-28 13:08:51 +00:00
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const rPinchDa = useRef<number[] | undefined>(undefined)
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const rPinchAngle = useRef<number>(undefined)
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const rPinchPoint = useRef<number[] | undefined>(undefined)
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const bind = usePinch(({ 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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state.send("PINCHED", {
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delta: vec.sub(rPinchPoint.current, origin),
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point: 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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return { ...bind() }
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}
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