0xa638cefe…1df7sent to0x6a4aa35b…a79e·#23,977,102·view on Etherscan
<!doctype html><html><head><meta charset="utf-8"><title>smear</title><style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body, html {
width: 100%;
height: 100%;
overflow: hidden;
background: #000;
}
smear-partition {
display: block;
width: 100%;
height: 100%;
position: relative;
}
smear-canvas {
display: block;
position: absolute;
}
smear-canvas canvas {
display: block;
width: 100%;
height: 100%;
image-rendering: pixelated;
image-rendering: -moz-crisp-edges;
image-rendering: crisp-edges;
-ms-interpolation-mode: nearest-neighbor;
}
.smear-container { position: absolute; overflow: hidden; }
.smear-container canvas { display: block; width: 100%; height: 100%; image-rendering: pixelated; image-rendering: crisp-edges; }
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class SmearCanvas {
constructor(c) {
this.container = c;
this.canvas = c.querySelector("canvas") || document.createElement("canvas");
if (!c.querySelector("canvas")) c.appendChild(this.canvas);
this.ctx = this.canvas.getContext("2d");
this.ctx.imageSmoothingEnabled = false;
this.imageData = null;
this.lastTime = 0;
this.animationId = null;
this.speed = parseInt(c.dataset.speed) || 50;
this.pixelSize = parseInt(c.dataset.pixelSize) || 2;
this.sourceInterval = parseInt(c.dataset.sourceInterval) || 1000;
this.colorFg = c.dataset.colorFg || "#FFFFFF";
this.colorBg = c.dataset.colorBg || "#000000";
this.sourceType = c.dataset.sourceType || "noise";
this.startEdge = c.dataset.startEdge || "top";
this.fgRGB = this.hexToRGB(this.colorFg);
this.bgRGB = this.hexToRGB(this.colorBg);
this.moveSpeed = (1000 / 60) / this.speed;
this.subPixelX = 0;
this.subPixelY = 0;
this.leadX = 0;
this.leadY = 0;
this.initDirection();
this.lastDirectionChange = 0;
this.nextDirectionInterval = this.randomInterval();
this.sourceParams = this.generateSourceParams();
this.lastSourceTime = 0;
this.resize();
this.initCanvas();
this.generateSourceEdge();
this.initLeadPosition();
this.startAnimation();
this.resizeObserver = new ResizeObserver(() => this.resize());
this.resizeObserver.observe(this.container);
}
generateSourceParams() {
return {
steps: 3 + Math.floor(Math.random() * 6),
stripeWidth: 2 + Math.floor(Math.random() * 8),
checkSize: 1 + Math.floor(Math.random() * 4),
phase: 0,
dashLength: 3 + Math.floor(Math.random() * 10),
gapLength: 2 + Math.floor(Math.random() * 6),
density: 0.05 + Math.random() * 0.25,
frequency: 1 + Math.random() * 4,
sinePhase: Math.random() * Math.PI * 2,
seed1: Math.random() * 100,
seed2: Math.random() * 100,
seed3: Math.random() * 100,
counter: Math.floor(Math.random() * 65536),
caRule: Math.random() > 0.5 ? 30 : 110
};
}
initDirection() {
switch (this.startEdge) {
case "top": this.dx = 0; this.dy = 1; break;
case "bottom": this.dx = 0; this.dy = -1; break;
case "left": this.dx = 1; this.dy = 0; break;
case "right": this.dx = -1; this.dy = 0; break;
default: this.dx = 0; this.dy = 1;
}
}
initLeadPosition() {
switch (this.startEdge) {
case "top": this.leadX = Math.floor(this.internalWidth / 2); this.leadY = 1; break;
case "bottom": this.leadX = Math.floor(this.internalWidth / 2); this.leadY = this.internalHeight - 2; break;
case "left": this.leadX = 1; this.leadY = Math.floor(this.internalHeight / 2); break;
case "right": this.leadX = this.internalWidth - 2; this.leadY = Math.floor(this.internalHeight / 2); break;
}
}
resize() {
var rect = this.container.getBoundingClientRect();
if (rect.width === 0 || rect.height === 0) return;
this.internalWidth = Math.ceil(rect.width / this.pixelSize);
this.internalHeight = Math.ceil(rect.height / this.pixelSize);
var oldImageData = this.imageData;
var oldWidth = this.canvas.width;
var oldHeight = this.canvas.height;
this.canvas.width = this.internalWidth;
this.canvas.height = this.internalHeight;
this.imageData = this.ctx.createImageData(this.internalWidth, this.internalHeight);
if (oldImageData && oldWidth > 0 && oldHeight > 0) {
var minW = Math.min(oldWidth, this.internalWidth);
var minH = Math.min(oldHeight, this.internalHeight);
for (var y = 0; y < minH; y++) {
for (var x = 0; x < minW; x++) {
var oi = (y * oldWidth + x) * 4;
var ni = (y * this.internalWidth + x) * 4;
this.imageData.data[ni] = oldImageData.data[oi];
this.imageData.data[ni + 1] = oldImageData.data[oi + 1];
this.imageData.data[ni + 2] = oldImageData.data[oi + 2];
this.imageData.data[ni + 3] = oldImageData.data[oi + 3];
}
}
}
}
hexToRGB(hex) {
var r = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
return r ? { r: parseInt(r[1], 16), g: parseInt(r[2], 16), b: parseInt(r[3], 16) } : { r: 255, g: 255, b: 255 };
}
lerpColor(t) {
return {
r: Math.round(this.bgRGB.r + (this.fgRGB.r - this.bgRGB.r) * t),
g: Math.round(this.bgRGB.g + (this.fgRGB.g - this.bgRGB.g) * t),
b: Math.round(this.bgRGB.b + (this.fgRGB.b - this.bgRGB.b) * t)
};
}
getSourceValue(pos, length) {
var t = pos / length;
switch (this.sourceType) {
case "noise": return Math.random() > 0.5 ? this.fgRGB : this.bgRGB;
case "linear-gradient": return this.lerpColor(t);
case "stepped-gradient":
var steps = this.sourceParams.steps || 5;
return this.lerpColor(Math.floor(t * steps) / (steps - 1));
case "random-gradient":
if (!this.gradientCache || this.gradientCache.length !== length) this.generateRandomGradient(length);
return this.lerpColor(this.gradientCache[pos]);
case "stripes":
return (Math.floor(pos / (this.sourceParams.stripeWidth || 4)) % 2 === 0) ? this.fgRGB : this.bgRGB;
case "checkerboard":
return ((Math.floor(pos / (this.sourceParams.checkSize || 2)) + (this.sourceParams.phase || 0)) % 2 === 0) ? this.fgRGB : this.bgRGB;
case "dashes":
var cycle = (this.sourceParams.dashLength || 6) + (this.sourceParams.gapLength || 3);
return (pos % cycle < (this.sourceParams.dashLength || 6)) ? this.fgRGB : this.bgRGB;
case "dots":
return Math.random() < (this.sourceParams.density || 0.15) ? this.fgRGB : this.bgRGB;
case "sine":
var sv = (Math.sin((t * (this.sourceParams.frequency || 2) * Math.PI * 2) + (this.sourceParams.sinePhase || 0)) + 1) / 2;
return this.lerpColor(sv);
case "perlin":
var p1 = Math.sin(t * 3.7 + this.sourceParams.seed1) * 0.5;
var p2 = Math.sin(t * 7.3 + this.sourceParams.seed2) * 0.25;
var p3 = Math.sin(t * 13.1 + this.sourceParams.seed3) * 0.125;
return this.lerpColor(Math.max(0, Math.min(1, (p1 + p2 + p3 + 0.875) / 1.75)));
case "binary-counter":
return ((this.sourceParams.counter >> (pos % 16)) & 1) ? this.fgRGB : this.bgRGB;
case "cellular-automata":
if (!this.caState || this.caState.length !== length) this.initCellularAutomata(length);
return this.caState[pos] ? this.fgRGB : this.bgRGB;
default:
return Math.random() > 0.5 ? this.fgRGB : this.bgRGB;
}
}
generateRandomGradient(length) {
var np = 3 + Math.floor(Math.random() * 4);
var cp = [0];
for (var i = 1; i < np - 1; i++) cp.push(Math.random());
cp.push(1);
cp.sort((a, b) => a - b);
var cv = cp.map(() => Math.random());
this.gradientCache = [];
for (var i = 0; i < length; i++) {
var t = i / length;
var si = 0;
for (var j = 0; j < cp.length - 1; j++) {
if (t >= cp[j] && t <= cp[j + 1]) { si = j; break; }
}
var st = (t - cp[si]) / (cp[si + 1] - cp[si]);
this.gradientCache.push(cv[si] + (cv[si + 1] - cv[si]) * st);
}
}
initCellularAutomata(length) {
this.caState = [];
for (var i = 0; i < length; i++) this.caState.push(Math.random() > 0.5);
}
evolveCellularAutomata() {
if (!this.caState) return;
var rule = this.sourceParams.caRule || 30;
var os = [...this.caState];
var len = this.caState.length;
for (var i = 0; i < len; i++) {
var p = (os[(i - 1 + len) % len] ? 4 : 0) + (os[i] ? 2 : 0) + (os[(i + 1) % len] ? 1 : 0);
this.caState[i] = ((rule >> p) & 1) === 1;
}
}
updateSourceParams() {
switch (this.sourceType) {
case "checkerboard": this.sourceParams.phase = (this.sourceParams.phase + 1) % 2; break;
case "sine": this.sourceParams.sinePhase += 0.5; break;
case "binary-counter": this.sourceParams.counter++; break;
case "cellular-automata": this.evolveCellularAutomata(); break;
case "random-gradient": this.gradientCache = null; break;
case "perlin":
this.sourceParams.seed1 += 0.3;
this.sourceParams.seed2 += 0.2;
this.sourceParams.seed3 += 0.1;
break;
}
}
randomInterval() { return 100 + Math.random() * 900; }
changeDirection() {
var dirs = [[0, 1], [1, 1], [1, 0], [1, -1], [0, -1], [-1, -1], [-1, 0], [-1, 1]];
var idx = dirs.findIndex(d => d[0] === this.dx && d[1] === this.dy);
if (idx === -1) idx = 0;
idx = Math.random() > 0.5 ? (idx + 1) % 8 : (idx + 7) % 8;
this.dx = dirs[idx][0];
this.dy = dirs[idx][1];
}
initCanvas() {
if (!this.imageData) return;
var data = this.imageData.data;
var w = this.internalWidth, h = this.internalHeight;
var isH = (this.startEdge === "top" || this.startEdge === "bottom");
for (var y = 0; y < h; y++) {
for (var x = 0; x < w; x++) {
var idx = (y * w + x) * 4;
var col = this.getSourceValue(isH ? x : y, isH ? w : h);
data[idx] = col.r;
data[idx + 1] = col.g;
data[idx + 2] = col.b;
data[idx + 3] = 255;
}
}
this.ctx.putImageData(this.imageData, 0, 0);
}
generateSourceEdge() {
if (!this.imageData) return;
this.updateSourceParams();
var data = this.imageData.data;
var w = this.internalWidth, h = this.internalHeight;
var gen = (getIdx, len) => {
for (var i = 0; i < len; i++) {
var idx = getIdx(i);
var c = this.getSourceValue(i, len);
data[idx] = c.r;
data[idx + 1] = c.g;
data[idx + 2] = c.b;
data[idx + 3] = 255;
}
};
switch (this.startEdge) {
case "top": gen(x => x * 4, w); break;
case "bottom": gen(x => ((h - 1) * w + x) * 4, w); break;
case "left": gen(y => (y * w) * 4, h); break;
case "right": gen(y => (y * w + (w - 1)) * 4, h); break;
}
}
getSourceEdgeCoord(x, y) {
switch (this.startEdge) {
case "top": return y === 0;
case "bottom": return y === this.internalHeight - 1;
case "left": return x === 0;
case "right": return x === this.internalWidth - 1;
}
return false;
}
smear() {
if (!this.imageData) return;
var data = this.imageData.data;
var w = this.internalWidth, h = this.internalHeight;
this.subPixelX += this.dx * this.moveSpeed;
this.subPixelY += this.dy * this.moveSpeed;
var moveX = Math.trunc(this.subPixelX), moveY = Math.trunc(this.subPixelY);
if (moveX === 0 && moveY === 0) return;
this.subPixelX -= moveX;
this.subPixelY -= moveY;
this.leadX += moveX;
this.leadY += moveY;
if (this.leadX <= 0 || this.leadX >= w - 1) { this.dx = -this.dx; this.leadX = Math.max(0, Math.min(w - 1, this.leadX)); }
if (this.leadY <= 0 || this.leadY >= h - 1) { this.dy = -this.dy; this.leadY = Math.max(0, Math.min(h - 1, this.leadY)); }
var oldData = new Uint8ClampedArray(data);
for (var y = 0; y < h; y++) {
for (var x = 0; x < w; x++) {
if (this.getSourceEdgeCoord(x, y)) continue;
var srcX = Math.max(0, Math.min(w - 1, x - moveX));
var srcY = Math.max(0, Math.min(h - 1, y - moveY));
var dstIdx = (y * w + x) * 4, srcIdx = (srcY * w + srcX) * 4;
data[dstIdx] = oldData[srcIdx];
data[dstIdx + 1] = oldData[srcIdx + 1];
data[dstIdx + 2] = oldData[srcIdx + 2];
data[dstIdx + 3] = oldData[srcIdx + 3];
}
}
}
startAnimation() {
var fi = 1000 / 60;
var animate = (ts) => {
if (!this.lastTime) this.lastTime = ts;
if (!this.lastSourceTime) this.lastSourceTime = ts;
if (!this.lastDirectionChange) this.lastDirectionChange = ts;
if (ts - this.lastDirectionChange >= this.nextDirectionInterval) {
this.changeDirection();
this.lastDirectionChange = ts;
this.nextDirectionInterval = this.randomInterval();
}
if (ts - this.lastSourceTime >= this.sourceInterval) {
this.generateSourceEdge();
this.lastSourceTime = ts;
}
if (ts - this.lastTime >= fi) {
this.smear();
if (this.imageData) this.ctx.putImageData(this.imageData, 0, 0);
this.lastTime = ts;
}
this.animationId = requestAnimationFrame(animate);
};
this.animationId = requestAnimationFrame(animate);
}
}
function layoutSmears() {
var vw = window.innerWidth, vh = window.innerHeight;
document.querySelectorAll(".smear-container").forEach(function(div) {
var x = parseFloat(div.dataset.x || 0);
var y = parseFloat(div.dataset.y || 0);
var w = parseFloat(div.dataset.width || 0);
var h = parseFloat(div.dataset.height || 0);
div.style.left = (x * vw) + "px";
div.style.top = (y * vh) + "px";
div.style.width = (w * vw) + "px";
div.style.height = (h * vh) + "px";
});
}
function initSmears() {
document.querySelectorAll(".smear-container").forEach(function(c) {
if (!c._smearInstance) c._smearInstance = new SmearCanvas(c);
});
}
window.addEventListener("load", function() { layoutSmears(); initSmears(); });
window.addEventListener("resize", layoutSmears);
layoutSmears();
initSmears();
</script></body></html>