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/*
* a = <canvas>
* b = <body>
* B = Bolt "class"
* c = context
* e = array of entities
* k = tick function
* m = mouse object
* r = scalar
* s = delta time
* S = Spark "class"
* t = current time
* v = isVisible?
* x = speed of time (starts at 1)
*/
/* eslint-disable no-undef */
/* Initial setup */
a.style.position = `absolute`
b.style.overflow = `hidden`
b.style.background = `#000`
e = []
r = Math.min(a.width, a.height)
m = {
x: a.width / 2,
y: a.height / 2
}
x = 1
// Is a point visible?
v = (point) => {
return (
(point.x > 0) &&
(point.x < a.width) &&
(point.y > 0) &&
(point.y < a.height)
)
}
// Bolt
B = () => {
// Calculate the list of points, starting at the mouse
let lastPoint = { x: m.x, y: m.y }
let points = [lastPoint]
let direction = Math.random() * Math.PI * 2
while (v(lastPoint)) {
let newLineLength = Math.random() * r / 6
direction += (Math.random() * Math.PI / 1.5) - (Math.PI / 3)
lastPoint = {
x: lastPoint.x + (Math.sin(direction) * newLineLength),
y: lastPoint.y + (Math.cos(direction) * newLineLength)
}
points.push(lastPoint)
}
points.reverse()
// Other startin values
let width = (Math.random() * r / 10) + (r / 20)
let red = Math.random() * 255
let green = Math.random() * 255
let blue = Math.random() * 255
let alpha = 1
let noSparksYet = 1 // used as true/false
let timeAlive = 0
let timeToFinish = (Math.random() * 200) + 100
// Jolt the screen
a.style.top = Math.round((Math.random() * 6) - 3) + `px`
a.style.left = Math.round((Math.random() * 6) - 3) + `px`
// Return value
let me = () => {
timeAlive += s
alpha -= s / 1000
if (alpha < 0) {
e.splice(e.indexOf(me), 1)
}
if (timeAlive > timeToFinish) {
c.lineWidth = width
width = Math.max(2, width - s)
if (noSparksYet) {
points.map((point) => e.push(S(point)))
noSparksYet = 0
}
} else {
c.lineWidth = 2
}
c.strokeStyle = `rgba(${[
red | 0,
green | 0,
blue | 0,
alpha
]})`
c.lineCap = `round`
c.beginPath()
c.moveTo(points[0].x, points[0].y)
points
.slice(0, timeAlive * points.length / timeToFinish)
.map((point) => c.lineTo(point.x, point.y))
c.stroke()
}
return me
}
// Spark
S = ({ x, y }) => {
let size = 10
let speed = Math.random() / 2
let direction = Math.random() * Math.PI * 2
let alpha = 1
let me = () => {
x += Math.sin(direction) * speed * s
y += Math.cos(direction) * speed * s
alpha -= s / 200
if (alpha < 0) {
e.splice(e.indexOf(me), 1)
}
c.fillStyle = `rgba(255,255,255,${alpha})`
c.fillRect(x - (size / 2), y - (size / 2), size, size)
}
return me
}
// Tick
let t = 0
requestAnimationFrame(k = (currentTime) => {
s = (currentTime - t) * x
t = currentTime
c.clearRect(0, 0, a.width, a.height)
if (Math.random() < (0.2 * x)) {
e.push(B())
}
e.map((entity) => entity())
requestAnimationFrame(k)
})
onmousemove = (event) => {
m.x = event.clientX
m.y = event.clientY
}
onkeydown = (event) => {
if (event.keyCode === 40) {
x = Math.max(0.1, x - 0.1)
}
if (event.keyCode === 38) {
x = Math.min(2, x + 0.1)
}
}
