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cursors add comments.

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This commit is contained in:
Miroslav Šedivý 2021-11-14 19:16:19 +01:00
parent d3fa448eb4
commit 9daa8461bb
1 changed files with 10 additions and 6 deletions
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16
src/component/cursors.vue
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@ -63,6 +63,7 @@
this._overlay.width = width * CANVAS_SCALE this._overlay.width = width * CANVAS_SCALE
this._overlay.height = height * CANVAS_SCALE this._overlay.height = height * CANVAS_SCALE
// store last drawing points
this._last_points = {} this._last_points = {}
} }
@ -76,18 +77,21 @@
} }
// start as undefined to prevent jumping // start as undefined to prevent jumping
private _prev_time!: number private _last_animation_time!: number
// current animation progress (0-1)
private _percent!: number private _percent!: number
// points to be animated for each session
private _points!: SessionCursors[] private _points!: SessionCursors[]
// last points coordinates for each session
private _last_points!: Record<string, Cursor> private _last_points!: Record<string, Cursor>
canvasAnimate(now: number = NaN) { canvasAnimate(now: number = NaN) {
// request another frame // request another frame
if (this._percent <= 1) requestAnimationFrame(this.canvasAnimate) if (this._percent <= 1) window.requestAnimationFrame(this.canvasAnimate)
// calculate factor // calculate factor
const delta = (now - this._prev_time) / POS_INTERVAL_MS const delta = (now - this._last_animation_time) / POS_INTERVAL_MS
this._prev_time = now this._last_animation_time = now
// skip very first delta to prevent jumping // skip very first delta to prevent jumping
if (isNaN(delta)) return if (isNaN(delta)) return
@ -95,9 +99,8 @@
// set the animation position // set the animation position
this._percent += delta this._percent += delta
// clear & scale canvas
this.canvasClear() this.canvasClear()
// scale
this._ctx.setTransform(CANVAS_SCALE, 0, 0, CANVAS_SCALE, 0, 0) this._ctx.setTransform(CANVAS_SCALE, 0, 0, CANVAS_SCALE, 0, 0)
// draw current position // draw current position
@ -158,6 +161,7 @@
return return
} }
// draw inactive cursor tag
this._ctx.save() this._ctx.save()
this._ctx.font = '14px Arial, sans-serif' this._ctx.font = '14px Arial, sans-serif'
this._ctx.textBaseline = 'top' this._ctx.textBaseline = 'top'