kopia lustrzana https://github.com/Tldraw/Tldraw
81 wiersze
1.7 KiB
TypeScript
81 wiersze
1.7 KiB
TypeScript
import { Vec2d } from '@tldraw/primitives'
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import { Editor } from '../Editor'
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export class TickManager {
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constructor(public editor: Editor) {
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this.editor.disposables.add(this.dispose)
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this.start()
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}
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raf: any
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isPaused = true
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last = 0
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t = 0
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start = () => {
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this.isPaused = false
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cancelAnimationFrame(this.raf)
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this.raf = requestAnimationFrame(this.tick)
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this.last = Date.now()
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}
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tick = () => {
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if (this.isPaused) {
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return
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}
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const now = Date.now()
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const elapsed = now - this.last
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this.last = now
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this.t += elapsed
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this.editor.emit('frame', elapsed)
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if (this.t < 16) {
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this.raf = requestAnimationFrame(this.tick)
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return
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}
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this.t -= 16
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this.updatePointerVelocity(elapsed)
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this.editor.emit('tick', elapsed)
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this.raf = requestAnimationFrame(this.tick)
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}
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// Clear the listener
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dispose = () => {
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this.isPaused = true
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cancelAnimationFrame(this.raf)
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}
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private prevPoint = new Vec2d()
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private updatePointerVelocity = (elapsed: number) => {
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const {
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prevPoint,
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editor: {
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inputs: { currentScreenPoint, pointerVelocity },
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},
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} = this
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if (elapsed === 0) return
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const delta = Vec2d.Sub(currentScreenPoint, prevPoint)
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this.prevPoint = currentScreenPoint.clone()
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const length = delta.len()
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const direction = length ? delta.div(length) : new Vec2d(0, 0)
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// consider adjusting this with an easing rather than a linear interpolation
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const next = pointerVelocity.clone().lrp(direction.mul(length / elapsed), 0.5)
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// if the velocity is very small, just set it to 0
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if (Math.abs(next.x) < 0.01) next.x = 0
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if (Math.abs(next.y) < 0.01) next.y = 0
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if (!pointerVelocity.equals(next)) {
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this.editor.inputs.pointerVelocity = next
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}
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}
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}
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