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script.js
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script.js
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'use strict';
const PI2 = 2 * Math.PI
function map(s, a1, a2, b1, b2) {
return (b1 + (s - a1) * (b2 - b1) / (a2 - a1));
}
class Connect {
constructor() {
ctx.lineWidth = 0.1
this.connectArea = {
maxConnectionLength: 80,
connectAreaRadius: 130,
x: 0,
y: 0,
destX: 0,
destY: 0
};
this.bounds = {
top: 2,
left: 2,
right: 0,
bottom: 0
};
this.dots = []
this.resize()
this.connectArea.x = this.centerX
this.connectArea.y = this.centerY
}
resize() {
this.width = window.innerWidth
this.height = window.innerHeight
this.centerX = this.width / 2 | 0
this.centerY = this.height / 2 | 0
canvas.width = this.width
canvas.height = this.height
this.connectArea.destX = this.centerX
this.connectArea.destY = this.centerY
this.bounds.right = this.width - 2
this.bounds.bottom = this.height - 2
this.colorCounter = 0
this.dotCount = this.width * this.height / 3000 | 0
if (this.dotCount > this.dots.length) {
for (let i = this.dotCount - this.dots.length; i > 0; i--) {
this.dots.push(
new Dot(
this.width,
this.height,
(((this.colorCounter += 2) < 360) ? this.colorCounter : this.colorCounter = 0)
)
)
}
} else if (this.dotCount < this.dots.length) {
this.dots.splice(0, this.dotCount - this.dots.length)
for (let i = 0; i < this.dotCount; i++) {
if (this.dots[i].y < this.bounds.top ||
this.dots[i].y > this.bounds.bottom ||
this.dots[i].x < this.bounds.left ||
this.dots[i].x > this.bounds.right) {
this.dots[i].x = Math.random() * this.width | 0
this.dots[i].y = Math.random() * this.height | 0
}
}
}
}
onMove(evt) {
this.connectArea.destX = evt.clientX || evt.touches && evt.touches[0].pageX
this.connectArea.destY = evt.clientY || evt.touches && evt.touches[0].pageY
}
onLeave(evt) {
this.connectArea.destX = this.centerX
this.connectArea.destY = this.centerY
}
connectDots() {
for (let i = 0; i < this.dotCount; i++) {
for (let j = i + 1; j < this.dotCount; j++) {
let dot1 = this.dots[i]
let dot2 = this.dots[j]
let xDiff = Math.abs(dot1.x - dot2.x)
let yDiff = Math.abs(dot1.y - dot2.y)
let xDiffArea = Math.abs(dot1.x - this.connectArea.x)
let yDiffArea = Math.abs(dot1.y - this.connectArea.y)
if (xDiff < this.connectArea.maxConnectionLength && yDiff < this.connectArea.maxConnectionLength &&
xDiffArea < this.connectArea.connectAreaRadius && yDiffArea < this.connectArea.connectAreaRadius) {
let gradient = ctx.createLinearGradient(dot1.x, dot1.y, dot2.x, dot1.y)
gradient.addColorStop(0, dot1.color)
gradient.addColorStop(1, dot2.color)
ctx.beginPath()
ctx.moveTo(dot1.x, dot1.y)
ctx.lineTo(dot2.x, dot2.y)
ctx.strokeStyle = gradient
ctx.stroke()
}
}
}
}
update() {
ctx.globalCompositeOperation = 'hard-light'
ctx.fillStyle = 'rgba(20,20,20,0.2)'
ctx.fillRect(0, 0, this.width, this.height)
ctx.globalCompositeOperation = 'source-over'
// ctx.clearRect(0, 0, this.width, this.height)
let distX = this.connectArea.destX - this.connectArea.x
if (distX > 5 || distX < 5) this.connectArea.x += distX / 10 | 0
let distY = this.connectArea.destY - this.connectArea.y
if (distX > 5 || distX < 5) this.connectArea.y += distY / 10 | 0
for (let i = 0; i < this.dotCount; i++) this.dots[i].update(this.bounds)
this.connectDots()
for (let i = 0; i < this.dotCount; i++) this.dots[i].draw()
}
}
class Dot {
constructor(width, height, color) {
this.x = Math.random() * width | 0
this.y = Math.random() * height | 0
this.vx = (Math.random() - 0.7) / 2
this.vy = (Math.random() - 0.7) / 2
this.radius = Math.random() * 2 + 0.3
this.color = 'hsla(' + color + ',80%,50%,' + this.radius * .5 + ')'
}
draw() {
ctx.beginPath()
ctx.fillStyle = this.color
ctx.arc(this.x, this.y, this.radius, 0, PI2)
ctx.fill()
}
update(bounds) {
if (this.y < bounds.top || this.y > bounds.bottom) this.vy = -this.vy
else if (this.x < bounds.left || this.x > bounds.right) this.vx = -this.vx
this.x += this.vx
this.y += this.vy
}
}
let canvas = document.getElementById('connect')
let ctx = canvas.getContext('2d')
let connect = new Connect()
canvas.onmousemove = (evt) => connect.onMove(evt)
canvas.onmouseleave = (evt) => connect.onLeave(evt)
canvas.ontouchstart = (evt) => connect.onMove(evt)
canvas.ontouchmove = (evt) => connect.onLeave(evt)
window.onresize = () => connect.resize()
; (function update() {
requestAnimationFrame(update)
connect.update()
}());