"use client"; import React from "react"; type PixelatedCanvasProps = { src: string; width?: number; height?: number; /** Size of each cell (in CSS pixels) used for sampling and spacing. */ cellSize?: number; /** Dot size as a fraction of cell size (0..1). */ dotScale?: number; /** Shape of the dot drawn for each sample. */ shape?: "circle" | "square"; /** Optional background color to clear the canvas with before drawing. */ backgroundColor?: string; /** Convert to grayscale before drawing. */ grayscale?: boolean; className?: string; /** Redraw on window resize using the provided width/height. */ responsive?: boolean; /** 0..1. Higher value removes more dots in low-contrast regions. */ dropoutStrength?: number; /** Enable interactive mouse distortion animation. */ interactive?: boolean; /** Max per-dot offset (px) due to distortion. */ distortionStrength?: number; /** Radius (px) around pointer influencing distortion. */ distortionRadius?: number; /** How pixels move near the pointer. */ distortionMode?: "repel" | "attract" | "swirl"; /** 0..1 smoothing factor for pointer follow. */ followSpeed?: number; /** Average multiple samples per cell instead of single center sample. */ sampleAverage?: boolean; /** Apply a color tint (e.g., "#0ea5e9" or "rgb(14,165,233)"). */ tintColor?: string; /** 0..1 tint mix amount with original colors. */ tintStrength?: number; /** Cap animation frame rate to improve perf on large canvases. */ maxFps?: number; /** Object-fit behavior for the source image within the canvas. */ objectFit?: "cover" | "contain" | "fill" | "none"; /** Random motion amplitude for dots near the pointer. */ jitterStrength?: number; /** Speed factor for the random motion. */ jitterSpeed?: number; /** Smoothly fade the distortion when the pointer leaves. */ fadeOnLeave?: boolean; /** 0..1 smoothing factor for leave fade. Higher = faster fade. */ fadeSpeed?: number; }; export const PixelatedCanvas: React.FC = ({ src, width = 400, height = 500, cellSize = 3, dotScale = 0.9, shape = "square", backgroundColor = "#000000", grayscale = false, className, responsive = false, dropoutStrength = 0.4, interactive = true, distortionStrength = 3, distortionRadius = 80, distortionMode = "swirl", followSpeed = 0.2, sampleAverage = true, tintColor = "#FFFFFF", tintStrength = 0.2, maxFps = 60, objectFit = "cover", jitterStrength = 4, jitterSpeed = 4, fadeOnLeave = true, fadeSpeed = 0.1, }) => { const canvasRef = React.useRef(null); const samplesRef = React.useRef< Array<{ x: number; y: number; r: number; g: number; b: number; a: number; drop: boolean; seed: number; }> >([]); const dimsRef = React.useRef<{ width: number; height: number; dot: number; } | null>(null); const targetMouseRef = React.useRef<{ x: number; y: number }>({ x: -9999, y: -9999, }); const animMouseRef = React.useRef<{ x: number; y: number }>({ x: -9999, y: -9999, }); const rafRef = React.useRef(null); const lastFrameRef = React.useRef(0); const pointerInsideRef = React.useRef(false); const activityRef = React.useRef(0); const activityTargetRef = React.useRef(0); React.useEffect(() => { let isCancelled = false; const canvas = canvasRef.current; if (!canvas) return; const img = new Image(); img.crossOrigin = "anonymous"; img.src = src; const compute = () => { if (!canvas) return; const dpr = typeof window !== "undefined" ? window.devicePixelRatio || 1 : 1; const displayWidth = width ?? img.naturalWidth; const displayHeight = height ?? img.naturalHeight; canvas.width = Math.max(1, Math.floor(displayWidth * dpr)); canvas.height = Math.max(1, Math.floor(displayHeight * dpr)); canvas.style.width = `${displayWidth}px`; canvas.style.height = `${displayHeight}px`; const ctx = canvas.getContext("2d"); if (!ctx) return; ctx.resetTransform(); ctx.scale(dpr, dpr); if (backgroundColor) { ctx.fillStyle = backgroundColor; ctx.fillRect(0, 0, displayWidth, displayHeight); } else { ctx.clearRect(0, 0, displayWidth, displayHeight); } const offscreen = document.createElement("canvas"); offscreen.width = Math.max(1, Math.floor(displayWidth)); offscreen.height = Math.max(1, Math.floor(displayHeight)); const off = offscreen.getContext("2d"); if (!off) return; const iw = img.naturalWidth || displayWidth; const ih = img.naturalHeight || displayHeight; let dw = displayWidth; let dh = displayHeight; let dx = 0; let dy = 0; if (objectFit === "cover") { const scale = Math.max(displayWidth / iw, displayHeight / ih); dw = Math.ceil(iw * scale); dh = Math.ceil(ih * scale); dx = Math.floor((displayWidth - dw) / 2); dy = Math.floor((displayHeight - dh) / 2); } else if (objectFit === "contain") { const scale = Math.min(displayWidth / iw, displayHeight / ih); dw = Math.ceil(iw * scale); dh = Math.ceil(ih * scale); dx = Math.floor((displayWidth - dw) / 2); dy = Math.floor((displayHeight - dh) / 2); } else if (objectFit === "fill") { dw = displayWidth; dh = displayHeight; } else { dw = iw; dh = ih; dx = Math.floor((displayWidth - dw) / 2); dy = Math.floor((displayHeight - dh) / 2); } off.drawImage(img, dx, dy, dw, dh); let imageData: ImageData; try { imageData = off.getImageData(0, 0, offscreen.width, offscreen.height); } catch { ctx.drawImage(img, 0, 0, displayWidth, displayHeight); return; } const data = imageData.data; const stride = offscreen.width * 4; const effectiveDotSize = Math.max(1, Math.floor(cellSize * dotScale)); dimsRef.current = { width: displayWidth, height: displayHeight, dot: effectiveDotSize, }; const luminanceAt = (px: number, py: number) => { const ix = Math.max(0, Math.min(offscreen.width - 1, px)); const iy = Math.max(0, Math.min(offscreen.height - 1, py)); const i = iy * stride + ix * 4; const rr = data[i]; const gg = data[i + 1]; const bb = data[i + 2]; return 0.2126 * rr + 0.7152 * gg + 0.0722 * bb; }; const hash2D = (ix: number, iy: number) => { const s = Math.sin(ix * 12.9898 + iy * 78.233) * 43758.5453123; return s - Math.floor(s); }; const samples: Array<{ x: number; y: number; r: number; g: number; b: number; a: number; drop: boolean; seed: number; }> = []; let tintRGB: [number, number, number] | null = null; if (tintColor && tintStrength > 0) { const parse = (c: string): [number, number, number] | null => { if (c.startsWith("#")) { const hex = c.slice(1); if (hex.length === 3) { const r = parseInt(hex[0] + hex[0], 16); const g = parseInt(hex[1] + hex[1], 16); const b = parseInt(hex[2] + hex[2], 16); return [r, g, b]; } const r = parseInt(hex.slice(0, 2), 16); const g = parseInt(hex.slice(2, 4), 16); const b = parseInt(hex.slice(4, 6), 16); return [r, g, b]; } const m = c.match(/rgb$(\d+)\s*,\s*(\d+)\s*,\s*(\d+)$/i); if (m) return [parseInt(m[1], 10), parseInt(m[2], 10), parseInt(m[3], 10)]; return null; }; tintRGB = parse(tintColor) as any; } for (let y = 0; y < offscreen.height; y += cellSize) { const cy = Math.min(offscreen.height - 1, y + Math.floor(cellSize / 2)); for (let x = 0; x < offscreen.width; x += cellSize) { const cx = Math.min( offscreen.width - 1, x + Math.floor(cellSize / 2), ); let r = 0; let g = 0; let b = 0; let a = 0; if (!sampleAverage) { const idx = cy * stride + cx * 4; r = data[idx]; g = data[idx + 1]; b = data[idx + 2]; a = data[idx + 3] / 255; } else { let count = 0; for (let oy = -1; oy <= 1; oy++) { for (let ox = -1; ox <= 1; ox++) { const sx = Math.max(0, Math.min(offscreen.width - 1, cx + ox)); const sy = Math.max(0, Math.min(offscreen.height - 1, cy + oy)); const sIdx = sy * stride + sx * 4; r += data[sIdx]; g += data[sIdx + 1]; b += data[sIdx + 2]; a += data[sIdx + 3] / 255; count++; } } r = Math.round(r / count); g = Math.round(g / count); b = Math.round(b / count); a = a / count; } if (grayscale) { const L = Math.round(0.2126 * r + 0.7152 * g + 0.0722 * b); r = L; g = L; b = L; } else if (tintRGB && tintStrength > 0) { const k = Math.max(0, Math.min(1, tintStrength)); r = Math.round(r * (1 - k) + tintRGB[0] * k); g = Math.round(g * (1 - k) + tintRGB[1] * k); b = Math.round(b * (1 - k) + tintRGB[2] * k); } const Lc = luminanceAt(cx, cy); const Lx1 = luminanceAt(cx - 1, cy); const Lx2 = luminanceAt(cx + 1, cy); const Ly1 = luminanceAt(cx, cy - 1); const Ly2 = luminanceAt(cx, cy + 1); const grad = Math.abs(Lx2 - Lx1) + Math.abs(Ly2 - Ly1) + Math.abs(Lc - (Lx1 + Lx2 + Ly1 + Ly2) / 4); const gradientNorm = Math.max(0, Math.min(1, grad / 255)); const dropoutProb = Math.max( 0, Math.min(1, (1 - gradientNorm) * dropoutStrength), ); const drop = hash2D(cx, cy) < dropoutProb; const seed = hash2D(cx, cy); samples.push({ x, y, r, g, b, a, drop, seed }); } } samplesRef.current = samples; }; img.onload = () => { if (isCancelled) return; compute(); const canvasEl = canvasRef.current; if (!canvasEl) return; if (!interactive) { const ctx = canvasEl.getContext("2d"); const dims = dimsRef.current; const samples = samplesRef.current; if (!ctx || !dims || !samples) return; if (backgroundColor) { ctx.fillStyle = backgroundColor; ctx.fillRect(0, 0, dims.width, dims.height); } else { ctx.clearRect(0, 0, dims.width, dims.height); } for (const s of samples) { if (s.drop || s.a <= 0) continue; ctx.globalAlpha = s.a; ctx.fillStyle = `rgb(${s.r}, ${s.g}, ${s.b})`; if (shape === "circle") { const radius = dims.dot / 2; ctx.beginPath(); ctx.arc( s.x + cellSize / 2, s.y + cellSize / 2, radius, 0, Math.PI * 2, ); ctx.fill(); } else { ctx.fillRect( s.x + cellSize / 2 - dims.dot / 2, s.y + cellSize / 2 - dims.dot / 2, dims.dot, dims.dot, ); } } ctx.globalAlpha = 1; return; } const onPointerMove = (e: PointerEvent) => { const rect = canvasEl.getBoundingClientRect(); targetMouseRef.current.x = e.clientX - rect.left; targetMouseRef.current.y = e.clientY - rect.top; pointerInsideRef.current = true; activityTargetRef.current = 1; }; const onPointerEnter = () => { pointerInsideRef.current = true; activityTargetRef.current = 1; }; const onPointerLeave = () => { pointerInsideRef.current = false; if (fadeOnLeave) { activityTargetRef.current = 0; } else { targetMouseRef.current.x = -9999; targetMouseRef.current.y = -9999; } }; canvasEl.addEventListener("pointermove", onPointerMove); canvasEl.addEventListener("pointerenter", onPointerEnter); canvasEl.addEventListener("pointerleave", onPointerLeave); const animate = () => { const now = performance.now(); const minDelta = 1000 / Math.max(1, maxFps); if (now - lastFrameRef.current < minDelta) { rafRef.current = requestAnimationFrame(animate); return; } lastFrameRef.current = now; const ctx = canvasEl.getContext("2d"); const dims = dimsRef.current; const samples = samplesRef.current; if (!ctx || !dims || !samples) { rafRef.current = requestAnimationFrame(animate); return; } animMouseRef.current.x = animMouseRef.current.x + (targetMouseRef.current.x - animMouseRef.current.x) * followSpeed; animMouseRef.current.y = animMouseRef.current.y + (targetMouseRef.current.y - animMouseRef.current.y) * followSpeed; if (fadeOnLeave) { activityRef.current = activityRef.current + (activityTargetRef.current - activityRef.current) * fadeSpeed; } else { activityRef.current = pointerInsideRef.current ? 1 : 0; } if (backgroundColor) { ctx.fillStyle = backgroundColor; ctx.fillRect(0, 0, dims.width, dims.height); } else { ctx.clearRect(0, 0, dims.width, dims.height); } const mx = animMouseRef.current.x; const my = animMouseRef.current.y; const sigma = Math.max(1, distortionRadius * 0.5); const t = now * 0.001 * jitterSpeed; const activity = Math.max(0, Math.min(1, activityRef.current)); for (const s of samples) { if (s.drop || s.a <= 0) continue; let drawX = s.x + cellSize / 2; let drawY = s.y + cellSize / 2; const dx = drawX - mx; const dy = drawY - my; const dist2 = dx * dx + dy * dy; const falloff = Math.exp(-dist2 / (2 * sigma * sigma)); const influence = falloff * activity; if (influence > 0.0005) { if (distortionMode === "repel") { const dist = Math.sqrt(dist2) + 0.0001; drawX += (dx / dist) * distortionStrength * influence; drawY += (dy / dist) * distortionStrength * influence; } else if (distortionMode === "attract") { const dist = Math.sqrt(dist2) + 0.0001; drawX -= (dx / dist) * distortionStrength * influence; drawY -= (dy / dist) * distortionStrength * influence; } else if (distortionMode === "swirl") { const angle = distortionStrength * 0.05 * influence; const cosA = Math.cos(angle); const sinA = Math.sin(angle); const rx = cosA * dx - sinA * dy; const ry = sinA * dx + cosA * dy; drawX = mx + rx; drawY = my + ry; } if (jitterStrength > 0) { const k = s.seed * 43758.5453; const jx = Math.sin(t + k) * jitterStrength * influence; const jy = Math.cos(t + k * 1.13) * jitterStrength * influence; drawX += jx; drawY += jy; } } ctx.globalAlpha = s.a; ctx.fillStyle = `rgb(${s.r}, ${s.g}, ${s.b})`; if (shape === "circle") { const radius = dims.dot / 2; ctx.beginPath(); ctx.arc(drawX, drawY, radius, 0, Math.PI * 2); ctx.fill(); } else { ctx.fillRect( drawX - dims.dot / 2, drawY - dims.dot / 2, dims.dot, dims.dot, ); } } ctx.globalAlpha = 1; rafRef.current = requestAnimationFrame(animate); }; if (rafRef.current) cancelAnimationFrame(rafRef.current); rafRef.current = requestAnimationFrame(animate); const cleanup = () => { canvasEl.removeEventListener("pointermove", onPointerMove); canvasEl.removeEventListener("pointerenter", onPointerEnter); canvasEl.removeEventListener("pointerleave", onPointerLeave); if (rafRef.current) cancelAnimationFrame(rafRef.current); }; (img as any)._cleanup = cleanup; }; img.onerror = () => { console.error("Failed to load image for PixelatedCanvas:", src); }; if (responsive) { const onResize = () => { if (img.complete && img.naturalWidth) { compute(); } }; window.addEventListener("resize", onResize); return () => { isCancelled = true; window.removeEventListener("resize", onResize); if ((img as any)._cleanup) (img as any)._cleanup(); }; } return () => { isCancelled = true; if ((img as any)._cleanup) (img as any)._cleanup(); }; }, [ src, width, height, cellSize, dotScale, shape, backgroundColor, grayscale, responsive, dropoutStrength, interactive, distortionStrength, distortionRadius, distortionMode, followSpeed, sampleAverage, tintColor, tintStrength, maxFps, objectFit, jitterStrength, jitterSpeed, fadeOnLeave, fadeSpeed, ]); return (

Pixelated Canvas

Instalação