Туман на фотографии

Пример:

HTML:

<div class="fog-container">
	<canvas id="fog"></canvas>
	<canvas id="fog-bg"></canvas>
	<canvas id="brush"></canvas>
</div>

</div>

CSS:

.fog-container {
	height: 540px;
	max-height: 90vh;
	position: relative;
	overflow: hidden;
	margin: 20px 0;
	border-radius: 6px;
}
.fog-container canvas {
	display: block;
	width: 100%;
	height: 100%;
	position: absolute;
	left: 50%;
	top: 0;
	transform: translate(-50%);
}
#brush {
	opacity: 0;
}

.fog-container {

height: 540px;

max-height: 90vh;

position: relative;

overflow: hidden;

margin: 20px 0;

border-radius: 6px;

}

.fog-container canvas {

display: block;

width: 100%;

height: 100%;

position: absolute;

left: 50%;

top: 0;

transform: translate(-50%);

}

#brush {

opacity: 0;

}

JS:

class FogParticle {
    constructor(ctx, canvasWidth, canvasHeight) {
        this.ctx = ctx
        this.canvasWidth = canvasWidth
        this.canvasHeight = canvasHeight
        this.x = 0
        this.y = 0
	}
    setPosition(x, y) {
        this.x = x
        this.y = y
	}
    setVelocity(x, y) {
        this.xVelocity = x
        this.yVelocity = y
	}
    setImage(image) {
        this.image = image
	}
    render() {
        if (!this.image) return
        this.ctx.drawImage(
            this.image,
            this.x - this.image.width / 2,
            this.y - this.image.height / 2,
            400,
            400
		)
        this.x += this.xVelocity
        this.y += this.yVelocity
        if (this.x >= this.canvasWidth) {
            this.xVelocity = -this.xVelocity
            this.x = this.canvasWidth
			} else if (this.x <= 0) {
            this.xVelocity = -this.xVelocity
            this.x = 0
		}
        if (this.y >= this.canvasHeight) {
            this.yVelocity = -this.yVelocity
            this.y = this.canvasHeight
			} else if (this.y <= 0) {
            this.yVelocity = -this.yVelocity
            this.y = 0
		}
	}
}
class Fog {
    constructor({ selector, density = 50, velocity = 2, particle, bgi } = {}) {
        const canvas = document.querySelector(selector)
        const bcr = canvas.parentElement.getBoundingClientRect()
        this.ctx = canvas.getContext('2d')
        this.canvasWidth = canvas.width = bcr.width
        this.canvasHeight = canvas.height = bcr.height
        this.particleCount = density
        this.maxVelocity = velocity
        this.particle = particle
        this.bgi = bgi
        this._createParticles()
        this._setImage()
        if (!this.bgi) return
        const img = new Image()
        img.onload = () => {
            const size = coverImg(img, this.canvasWidth, this.canvasHeight)
            this.bgi = { img, w: size.w, h: size.h }
            this._render()
		}
        img.src = this.bgi
	}
    _createParticles() {
        this.particles = []
        const random = (min, max) => Math.random() * (max - min) + min
        for (let i = 0; i < this.particleCount; i++) {
            const particle = new FogParticle(this.ctx, this.canvasWidth, this.canvasHeight)
            particle.setPosition(
                random(0, this.canvasWidth),
                random(0, this.canvasHeight)
			)
            particle.setVelocity(
                random(-this.maxVelocity, this.maxVelocity),
                random(-this.maxVelocity, this.maxVelocity)
			)
            this.particles.push(particle)
		}
	}
    _setImage() {
        if (!this.particle) return
        const img = new Image()
        img.onload = () => this.particles.forEach(p => p.setImage(img))
        img.src = this.particle
	}
    _render() {
        if (this.bgi) {
            this.ctx.drawImage(this.bgi.img, 0, 0, this.bgi.w, this.bgi.h)
			} else {
            this.ctx.fillStyle = "rgba(0, 0, 0, 1)"
            this.ctx.fillRect(0, 0, this.canvasWidth, this.canvasHeight)
		}
        this.particles.forEach(p => p.render())
        requestAnimationFrame(this._render.bind(this))
	}
}
class Eraser {
    constructor({ bgCanvas, brushCanvas, bgi, radius = 120 } = {}) {
        bgCanvas = this.bgCanvas = document.querySelector(bgCanvas)
        this.brushCanvas = document.querySelector(brushCanvas)
        this.bgCtx = this.bgCanvas.getContext('2d')
        this.brushCtx = this.brushCanvas.getContext('2d')
        this.parentElement = this.bgCanvas.parentElement
        const bcr = this.parentElement.getBoundingClientRect()
        this.canvasWidth = this.bgCanvas.width = this.brushCanvas.width = bcr.width
        this.canvasHeight = this.bgCanvas.height = this.brushCanvas.height = bcr.height
        this.brushRadius = radius
        this.bgi = new Image()
        this.bgi.onload = this._attachEvents.bind(this)
        this.bgi.src = bgi
        this.utils = {
            distanceBetween(point1, point2) {
                return Math.sqrt(Math.pow(point2.x - point1.x, 2) + Math.pow(point2.y - point1.y, 2))
			},
            angleBetween(point1, point2) {
                return Math.atan2(point2.x - point1.x, point2.y - point1.y)
			},
            getMousePos(e) {
                const bcr = bgCanvas.getBoundingClientRect()
                return {
                    x: e.clientX - bcr.left,
                    y: e.clientY - bcr.top
				}
			}
		}
	}
    _attachEvents() {
        this.parentElement.addEventListener('mousemove', this._onMouseMove.bind(this))
        this.parentElement.addEventListener('mouseleave', this._onMouseLeave.bind(this))
	}
    _onMouseMove(e) {
        const currentPoint = this.utils.getMousePos(e)
        this.lastPoint = this.lastPoint || currentPoint
        const dist = this.utils.distanceBetween(this.lastPoint, currentPoint)
        const angle = this.utils.angleBetween(this.lastPoint, currentPoint)
        for (let ii = 0; ii < dist; ii += 5) {
            const x = this.lastPoint.x + (Math.sin(angle) * ii)
            const y = this.lastPoint.y + (Math.cos(angle) * ii)
            const brush = this.brushCtx.createRadialGradient(x, y, 0, x, y, this.brushRadius)
            brush.addColorStop(0, 'rgba(0, 0, 0, 1)')
            brush.addColorStop(.3, 'rgba(0, 0, 0, .1)')
            brush.addColorStop(1, 'rgba(0, 0, 0, 0)')
            this.brushCtx.fillStyle = brush
            this.brushCtx.fillRect(
                x - this.brushRadius,
                y - this.brushRadius,
                this.brushRadius * 2,
                this.brushRadius * 2
			)
		}
        this.lastPoint = currentPoint
        this.bgCtx.globalCompositeOperation = 'source-over'
        const size = coverImg(this.bgi, this.canvasWidth, this.canvasHeight)
        this.bgCtx.drawImage(this.bgi, 0, 0, size.w, size.h)
        this.bgCtx.globalCompositeOperation = 'destination-in'
        this.bgCtx.drawImage(this.brushCanvas, 0, 0)
	}
    _onMouseLeave() {
        this.lastPoint = null
	}
}
const coverImg = (img, width, height) => {
    const ratio = img.width / img.height
    let w = width
    let h = w / ratio
    if (h < height) {
        h = height
        w = h * ratio
	}
    return { w, h }
}
const bgi = 'morning-forest-5.webp'

function resize() {
	new Fog({
		selector: '#fog',
		particle: 'textures/fog-particle.png',
		density: 60,
		bgi,
	})
	new Eraser({
		bgCanvas: '#fog-bg',
		brushCanvas: '#brush',
		radius: 80,
		bgi,
	})
}
resize();
window.addEventListener("resize", resize);

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class FogParticle {

constructor(ctx, canvasWidth, canvasHeight) {

this.ctx = ctx

this.canvasWidth = canvasWidth

this.canvasHeight = canvasHeight

this.x = 0

this.y = 0

}

setPosition(x, y) {

this.x = x

this.y = y

}

setVelocity(x, y) {

this.xVelocity = x

this.yVelocity = y

}

setImage(image) {

this.image = image

}

render() {

if (!this.image) return

this.ctx.drawImage(

this.image,

this.x - this.image.width / 2,

this.y - this.image.height / 2,

400,

400

)

this.x += this.xVelocity

this.y += this.yVelocity

if (this.x >= this.canvasWidth) {

this.xVelocity = -this.xVelocity

this.x = this.canvasWidth

} else if (this.x <= 0) {

this.xVelocity = -this.xVelocity

this.x = 0

}

if (this.y >= this.canvasHeight) {

this.yVelocity = -this.yVelocity

this.y = this.canvasHeight

} else if (this.y <= 0) {

this.yVelocity = -this.yVelocity

this.y = 0

}

class Fog {

constructor({ selector, density = 50, velocity = 2, particle, bgi } = {}) {

const canvas = document.querySelector(selector)

const bcr = canvas.parentElement.getBoundingClientRect()

this.ctx = canvas.getContext('2d')

this.canvasWidth = canvas.width = bcr.width

this.canvasHeight = canvas.height = bcr.height

this.particleCount = density

this.maxVelocity = velocity

this.particle = particle

this.bgi = bgi

this._createParticles()

this._setImage()

if (!this.bgi) return

const img = new Image()

img.onload = () => {

const size = coverImg(img, this.canvasWidth, this.canvasHeight)

this.bgi = { img, w: size.w, h: size.h }

this._render()

}

img.src = this.bgi

}

_createParticles() {

this.particles = []

const random = (min, max) => Math.random() * (max - min) + min

for (let i = 0; i < this.particleCount; i++) {

const particle = new FogParticle(this.ctx, this.canvasWidth, this.canvasHeight)

particle.setPosition(

random(0, this.canvasWidth),

random(0, this.canvasHeight)

)

particle.setVelocity(

random(-this.maxVelocity, this.maxVelocity),

random(-this.maxVelocity, this.maxVelocity)

)

this.particles.push(particle)

}

_setImage() {

if (!this.particle) return

const img = new Image()

img.onload = () => this.particles.forEach(p => p.setImage(img))

img.src = this.particle

}

_render() {

if (this.bgi) {

this.ctx.drawImage(this.bgi.img, 0, 0, this.bgi.w, this.bgi.h)

} else {

this.ctx.fillStyle = "rgba(0, 0, 0, 1)"

this.ctx.fillRect(0, 0, this.canvasWidth, this.canvasHeight)

}

this.particles.forEach(p => p.render())

requestAnimationFrame(this._render.bind(this))

}

class Eraser {

constructor({ bgCanvas, brushCanvas, bgi, radius = 120 } = {}) {

bgCanvas = this.bgCanvas = document.querySelector(bgCanvas)

this.brushCanvas = document.querySelector(brushCanvas)

this.bgCtx = this.bgCanvas.getContext('2d')

this.brushCtx = this.brushCanvas.getContext('2d')

this.parentElement = this.bgCanvas.parentElement

const bcr = this.parentElement.getBoundingClientRect()

this.canvasWidth = this.bgCanvas.width = this.brushCanvas.width = bcr.width

this.canvasHeight = this.bgCanvas.height = this.brushCanvas.height = bcr.height

this.brushRadius = radius

this.bgi = new Image()

this.bgi.onload = this._attachEvents.bind(this)

this.bgi.src = bgi

this.utils = {

distanceBetween(point1, point2) {

return Math.sqrt(Math.pow(point2.x - point1.x, 2) + Math.pow(point2.y - point1.y, 2))

angleBetween(point1, point2) {

return Math.atan2(point2.x - point1.x, point2.y - point1.y)

getMousePos(e) {

const bcr = bgCanvas.getBoundingClientRect()

return {

x: e.clientX - bcr.left,

y: e.clientY - bcr.top

}

_attachEvents() {

this.parentElement.addEventListener('mousemove', this._onMouseMove.bind(this))

this.parentElement.addEventListener('mouseleave', this._onMouseLeave.bind(this))

}

_onMouseMove(e) {

const currentPoint = this.utils.getMousePos(e)

this.lastPoint = this.lastPoint || currentPoint

const dist = this.utils.distanceBetween(this.lastPoint, currentPoint)

const angle = this.utils.angleBetween(this.lastPoint, currentPoint)

for (let ii = 0; ii < dist; ii += 5) {

const x = this.lastPoint.x + (Math.sin(angle) * ii)

const y = this.lastPoint.y + (Math.cos(angle) * ii)

const brush = this.brushCtx.createRadialGradient(x, y, 0, x, y, this.brushRadius)

brush.addColorStop(0, 'rgba(0, 0, 0, 1)')

brush.addColorStop(.3, 'rgba(0, 0, 0, .1)')

brush.addColorStop(1, 'rgba(0, 0, 0, 0)')

this.brushCtx.fillStyle = brush

this.brushCtx.fillRect(

x - this.brushRadius,

y - this.brushRadius,

this.brushRadius * 2,

this.brushRadius * 2

)

}

this.lastPoint = currentPoint

this.bgCtx.globalCompositeOperation = 'source-over'

const size = coverImg(this.bgi, this.canvasWidth, this.canvasHeight)

this.bgCtx.drawImage(this.bgi, 0, 0, size.w, size.h)

this.bgCtx.globalCompositeOperation = 'destination-in'

this.bgCtx.drawImage(this.brushCanvas, 0, 0)

}

_onMouseLeave() {

this.lastPoint = null

}

const coverImg = (img, width, height) => {

const ratio = img.width / img.height

let w = width

let h = w / ratio

if (h < height) {

h = height

w = h * ratio

}

return { w, h }

}

const bgi = 'morning-forest-5.webp'

function resize() {

new Fog({

selector: '#fog',

particle: 'textures/fog-particle.png',

density: 60,

bgi,

})

new Eraser({

bgCanvas: '#fog-bg',

brushCanvas: '#brush',

radius: 80,

bgi,

})

}

resize();

window.addEventListener("resize", resize);

В скрипте используются фоновое изображение morning-forest-5.webp и туман textures/fog-particle.png
На странице может использоваться только одно изображение с таким эффектом
Найдено на codepen.io у пользователя Maciej

Пример:

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CSS:

JS:

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