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mybb@mybb.ru (Merlin) — Wed, 29 Oct 2025 20:41:49 +0300

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

/* �� */
@media (min-width: 768px) {
.fog-container {
max-width: 60rem; /* ≈960px �� 16px �� */
margin-left: auto;
margin-right: auto;
}
}

.fog-container canvas {
display: block;
width: 100%;
height: 100%;
position: absolute;
left: 50%;
top: 0;
transform: translateX(-50%);
}

#brush {
opacity: 0;
}
</style>

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 } = {}) {
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.src = bgi;
this.bgi.onload = this._attachEvents.bind(this);

_attachEvents() {
const parent = this.parentElement;
parent.addEventListener('mousemove', this._onMouseMove.bind(this));
parent.addEventListener('mouseleave', this._onMouseLeave.bind(this));
parent.addEventListener('touchstart', this._onTouchStart.bind(this), { passive: false });
parent.addEventListener('touchmove', this._onTouchMove.bind(this), { passive: false });
parent.addEventListener('touchend', this._onTouchEnd.bind(this), { passive: false });
}

_onMouseMove(e) {
const currentPoint = this.utils.getMousePos(e);
this._drawStroke(currentPoint);
}

_onMouseLeave() {
this.lastPoint = null;
}

_onTouchStart(e) {
e.preventDefault();
const touch = e.touches[0];
const pos = this.utils.getTouchPos(touch);
this.lastPoint = pos;
}

_onTouchMove(e) {
e.preventDefault();
const touch = e.touches[0];
const currentPoint = this.utils.getTouchPos(touch);
this._drawStroke(currentPoint);
}

_onTouchEnd(e) {
e.preventDefault();
this.lastPoint = null;
}

_drawStroke(currentPoint) {
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(0.3, 'rgba(0, 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);
}
}

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 = 'https://atuin.ru/demo/i/fog-bg.webp';

// ��
function getFogDensity() {
if (window.innerWidth < 480) return 25; // ��
if (window.innerWidth < 768) return 35; // ��
return 60; // ��
}

function getEraserRadius() {
if (window.innerWidth < 480) return 40;
if (window.innerWidth < 768) return 55;
return 80;
}

function resize() {
// ��
new Fog({
selector: '#fog',
particle: 'https://atuin.ru/demo/i/fog-particle.png',
density: getFogDensity(),
bgi,
});
new Eraser({
bgCanvas: '#fog-bg',
brushCanvas: '#brush',
radius: getEraserRadius(),
bgi,
});
}

// ��
resize();
window.addEventListener("resize", resize);
</script>[/html]

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mybb@mybb.ru (Merlin) — Wed, 29 Oct 2025 15:59:21 +0300

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

/* ��: �� */
@media (min-width: 768px) {
.fog-container {
max-width: 60rem; /* ≈960px �� 16px */
/* ��, ��: max-width: 80vw; � 80% �� */
margin-left: auto;
margin-right: auto;
}
}
</style>

this.bgi = new Image();
this.bgi.src = bgi;
this.bgi.onload = this._attachEvents.bind(this);

_attachEvents() {
const parent = this.parentElement;

// ��
parent.addEventListener('mousemove', this._onMouseMove.bind(this));
parent.addEventListener('mouseleave', this._onMouseLeave.bind(this));

// ��
parent.addEventListener('touchstart', this._onTouchStart.bind(this), { passive: false });
parent.addEventListener('touchmove', this._onTouchMove.bind(this), { passive: false });
parent.addEventListener('touchend', this._onTouchEnd.bind(this), { passive: false });
}

_onMouseMove(e) {
const currentPoint = this.utils.getMousePos(e);
this._drawStroke(currentPoint);
}

_onMouseLeave() {
this.lastPoint = null;
}

_onTouchStart(e) {
e.preventDefault();
const touch = e.touches[0];
const pos = this.utils.getTouchPos(touch);
this.lastPoint = pos;
}

_onTouchMove(e) {
e.preventDefault();
const touch = e.touches[0];
const currentPoint = this.utils.getTouchPos(touch);
this._drawStroke(currentPoint);
}

_onTouchEnd(e) {
e.preventDefault();
this.lastPoint = null;
}

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);
}
}

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 };
};

// ⚠️ �� URL!
const bgi = 'https://atuin.ru/demo/i/fog-bg.webp';

function resize() {
// �� resize (��, �� )
new Fog({
selector: '#fog',
particle: 'https://atuin.ru/demo/i/fog-particle.png',
density: 60,
bgi,
});
new Eraser({
bgCanvas: '#fog-bg',
brushCanvas: '#brush',
radius: 80,
bgi,
});
}

resize();
window.addEventListener("resize", resize);
</script>[/html]

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