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本想做成火球形的，结果变成了火砖形。
代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width" />
<title>Fire</title>
<style>
html,
body,
canvas {
width: 100vw;
height: 100vh;
background: rgb(0, 0, 0);
overflow: hidden;
}
</style>
</head>
<body>
<canvas></canvas>
<script>
window.onload = function() {
var width = window.innerWidth
var height = window.innerHeight
var canvas = document.querySelector('canvas')
canvas.width = width
canvas.height = height
var ctx = canvas.getContext('2d')
ctx.globalCompositeOperation = 'lighter'
var fires = new Set()
var count = 0
function randomNUM(min, max) {
return Math.floor(Math.random() * (max - min) + min)
}
function F() {}
F.prototype.initState = function(x, y) {
this.x = x
this.y = y
this.vx = (Math.random() - 0.5) * 2
this.vy = (Math.random() - 1.5) * 4
this.opacity = 1
this.radius = 20
this.g = 0
}
F.prototype.render = function(x, y) {
this.x += this.vx
this.y += this.vy
this.radius -= 1
this.opacity -= 0.05
this.g += 10
this.draw()
if (
this.opacity <= 0 ||
this.radius <= 0 ||
this.g >= 255
) {
this.initState(x, y)
}
}
F.prototype.draw = function() {
var radgrad = ctx.createRadialGradient(
this.x,
this.y,
this.radius / 2,
this.x,
this.y * 2,
this.radius,
)
radgrad.addColorStop(
0,
'rgba(255,' + this.g + ',0,' + this.opacity + ')',
)
radgrad.addColorStop(0.5, 'rgb(255,0,0)')
radgrad.addColorStop(1, 'rgb(255,0,0)')
ctx.fillStyle = radgrad
ctx.beginPath()
ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false)
ctx.closePath()
ctx.fill()
}
function Fire() {
this.x = randomNUM(width / 3, (width / 5) * 6)
this.y = 0
this.speedX = randomNUM(4, 12)
this.speedY = this.speedX
this.fire = new Set()
this.isOver = false
}
Fire.prototype.makeFire = function() {
if (!this.isOver) {
var f = new F()
f.initState(this.x, this.y)
this.fire.add(f)
this.x -= this.speedX
this.y += this.speedY
this.speedX += 0.1
this.speedY += 0.1
if (this.y >= height + 200) this.isOver = true
}
}
function run() {
if (count < 10) {
fires.add(new Fire())
count += 1
}
fires.forEach(function(fe) {
fe.makeFire()
fe.fire.forEach(function(f) {
f.render(fe.x, fe.y)
})
if (fe.isOver) {
fires.delete(fe)
fires.add(new Fire())
}
})
}
;(function animate() {
ctx.clearRect(0, 0, width, height)
run()
requestAnimationFrame(animate)
})()
}
</script>
</body>
</html>
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970106_lzh 2年前 (2021-01-08)说：
huihui 2年前 (2020-10-20)说：
Satisfy 3年前 (2020-06-05)说：
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