| 1 |
(function() { |
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"use strict"; |
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const CONFIG = { |
| 4 |
/** Grid stride when sampling the logo PNG. Smaller → denser particle field → heavier frame cost. */ |
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sampleStride: 7, |
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/** Alpha threshold (0–255) for "this pixel is part of the logo." */ |
| 7 |
alphaThreshold: 128, |
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/** |
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* Target logo rendering width in CSS pixels. Capped at this value |
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* on huge screens; on normal screens we take 72% of the smaller |
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* shell axis so the logo reads as "hero-sized" without cropping. |
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*/ |
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targetLogoWidth: 1e3, |
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/** Fraction of the smaller shell dimension the logo is allowed to occupy. */ |
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logoShellFraction: 0.72, |
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/** |
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* Spring stiffness — how hard a particle pulls back to its home. |
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* Lower = slower, floatier return. At 0.015 the natural-frequency |
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* period is ~50 frames (~0.85 s at 60 fps), so particles visibly |
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* drift back after a cursor flick rather than snapping home. |
| 21 |
*/ |
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springK: 0.015, |
| 23 |
/** Velocity damping per tick. 1 = no damping, 0 = instant stop. */ |
| 24 |
damping: 0.86, |
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/** |
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* Velocity floor below which a particle is considered at rest — |
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* its position snaps to its home and its velocity zeroes out. Kills |
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* the subpixel jitter that made the resting logo flicker. |
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*/ |
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restVelocityEpsilon: 0.02, |
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/** |
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* Sand-drag brush radius in CSS pixels. Particles within this |
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* distance of the cursor pick up a fraction of the cursor's |
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* per-frame displacement — they're carried in the direction the |
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* cursor is moving, not pushed away from its position. Beyond |
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* the radius the cursor has no effect. |
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*/ |
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dragRadius: 150, |
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/** |
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* Base fraction of the cursor's per-frame displacement that a |
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* particle inherits when it's at the dead center of the brush. |
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* At 0.22 a particle in the brush core picks up roughly a |
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* quarter of the cursor's velocity per frame — enough to read |
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* as "dragged" without the particles chasing the cursor. |
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*/ |
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dragStrength: 0.22, |
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/** |
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* Super-linear speed boost. For every {@link dragBoostRefSpeed} |
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* pixels-per-frame of cursor speed, the applied drag force is |
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* additionally scaled by this factor. Kept gentle (0.3) so fast |
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* flicks feel a bit punchier than linear without flinging |
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* particles across the screen. |
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*/ |
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dragBoost: 0.3, |
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/** Reference cursor speed for the boost curve (CSS px / frame). */ |
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dragBoostRefSpeed: 40, |
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/** |
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* Cap on the mouse delta a single frame can accumulate. Prevents |
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* a wild delta from a stale pointer (e.g. first pointermove after |
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* the cursor entered from offscreen) from launching particles |
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* into orbit. A real fast mouse rarely exceeds 80 px/frame. |
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*/ |
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maxMouseDelta: 80, |
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/** |
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* Radial-gradient brush texture size. Larger = smoother edges at |
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* the cost of texture memory. 128px is plenty — sprites scale |
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* down to 10–30 px range for rendering so we have headroom. |
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*/ |
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brushSize: 128, |
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/** Min/max sprite scale relative to the brush texture size. */ |
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spriteScaleMin: 0.1, |
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spriteScaleMax: 0.26, |
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/** Min/max per-particle alpha. */ |
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spriteAlphaMin: 0.55, |
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spriteAlphaMax: 0.92 |
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}; |
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const PARTICLE_PALETTE = [ |
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// Rainbow six (higher weight — the flag's main body). |
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16726843, |
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16726843, |
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// red |
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16747562, |
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16747562, |
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// orange |
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16767293, |
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16767293, |
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// yellow |
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5036388, |
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5036388, |
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// green |
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4104447, |
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4104447, |
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// blue |
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11037695, |
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11037695, |
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// purple |
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// Trans flag stripes. |
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16757703, |
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// pink |
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8380415, |
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// light blue |
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16777215, |
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// white |
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// POC inclusion stripe. |
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13140042 |
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// warm brown (boosted for visibility under additive) |
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]; |
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const BACKDROP_CSS = "radial-gradient(circle at 50% 50%, #1e40af 0%, #152a6b 45%, #0a1024 100%)"; |
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async function mountScene({ container, logoUrl, prefersReducedMotion }) { |
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const pixi = window.PIXI; |
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if (!pixi) { |
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throw new Error( |
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"[animated-logo-wallpaper] window.PIXI is undefined; declare `needs: ['pixijs']` on the wallpaper def so the shell loads it before mount." |
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); |
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} |
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const homes = await sampleLogoHomes(logoUrl); |
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const priorBackground = container.style.background; |
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container.style.background = BACKDROP_CSS; |
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const app = new pixi.Application(); |
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await app.init({ |
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resizeTo: container, |
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backgroundAlpha: 0, |
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antialias: true, |
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autoDensity: true, |
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resolution: Math.min(window.devicePixelRatio || 1, 2) |
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}); |
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container.appendChild(app.canvas); |
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applyCanvasLayout(app.canvas); |
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const brushTexture = buildBrushTexture(pixi); |
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const particleLayer = new pixi.Container(); |
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app.stage.addChild(particleLayer); |
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const n = homes.length; |
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const homeX = new Float32Array(n); |
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const homeY = new Float32Array(n); |
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const x = new Float32Array(n); |
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const y = new Float32Array(n); |
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const vx = new Float32Array(n); |
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const vy = new Float32Array(n); |
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const sprites = new Array(n); |
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for (let i = 0; i < n; i++) { |
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const sprite = new pixi.Sprite(brushTexture); |
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sprite.anchor.set(0.5); |
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sprite.blendMode = "add"; |
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sprite.tint = PARTICLE_PALETTE[Math.floor(Math.random() * PARTICLE_PALETTE.length)]; |
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const scale = CONFIG.spriteScaleMin + Math.random() * (CONFIG.spriteScaleMax - CONFIG.spriteScaleMin); |
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sprite.scale.set(scale); |
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sprite.alpha = CONFIG.spriteAlphaMin + Math.random() * (CONFIG.spriteAlphaMax - CONFIG.spriteAlphaMin); |
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particleLayer.addChild(sprite); |
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sprites[i] = sprite; |
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} |
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let logoScale = 1; |
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let logoOffsetX = 0; |
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let logoOffsetY = 0; |
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const computeLayout = () => { |
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const w = app.canvas.clientWidth; |
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const h = app.canvas.clientHeight; |
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const target = Math.min( |
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CONFIG.targetLogoWidth, |
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Math.min(w, h) * CONFIG.logoShellFraction |
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); |
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logoScale = target; |
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logoOffsetX = (w - target) / 2; |
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logoOffsetY = (h - target) / 2; |
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for (let i = 0; i < n; i++) { |
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homeX[i] = logoOffsetX + homes[i][0] * logoScale; |
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homeY[i] = logoOffsetY + homes[i][1] * logoScale; |
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if (x[i] === 0 && y[i] === 0) { |
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x[i] = homeX[i]; |
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y[i] = homeY[i]; |
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} |
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} |
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}; |
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computeLayout(); |
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const resizeObserver = new ResizeObserver(() => computeLayout()); |
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resizeObserver.observe(container); |
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let pointerX = -1e6; |
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let pointerY = -1e6; |
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let pointerActive = false; |
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let mouseDx = 0; |
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let mouseDy = 0; |
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const onPointerMove = (e) => { |
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const rect = app.canvas.getBoundingClientRect(); |
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const nx = e.clientX - rect.left; |
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const ny = e.clientY - rect.top; |
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if (pointerActive) { |
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const rawDx = nx - pointerX; |
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const rawDy = ny - pointerY; |
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const cap = CONFIG.maxMouseDelta; |
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mouseDx += Math.max(-cap, Math.min(cap, rawDx)); |
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mouseDy += Math.max(-cap, Math.min(cap, rawDy)); |
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} |
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pointerX = nx; |
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pointerY = ny; |
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pointerActive = true; |
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}; |
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const onPointerLeave = () => { |
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pointerX = -1e6; |
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pointerY = -1e6; |
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pointerActive = false; |
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mouseDx = 0; |
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mouseDy = 0; |
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}; |
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window.addEventListener("pointermove", onPointerMove, { passive: true }); |
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window.addEventListener("pointerleave", onPointerLeave); |
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let animating = !prefersReducedMotion; |
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const syncSprites = () => { |
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for (let i = 0; i < n; i++) { |
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sprites[i].x = x[i]; |
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sprites[i].y = y[i]; |
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} |
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}; |
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const tick = () => { |
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if (animating) { |
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step( |
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n, |
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homeX, |
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homeY, |
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x, |
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y, |
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vx, |
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vy, |
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pointerX, |
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pointerY, |
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pointerActive ? mouseDx : 0, |
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pointerActive ? mouseDy : 0 |
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); |
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} |
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mouseDx = 0; |
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mouseDy = 0; |
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syncSprites(); |
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}; |
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app.ticker.add(tick); |
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syncSprites(); |
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if (!animating) { |
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app.renderer.render(app.stage); |
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app.ticker.stop(); |
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} |
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return { |
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destroy() { |
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resizeObserver.disconnect(); |
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window.removeEventListener("pointermove", onPointerMove); |
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window.removeEventListener("pointerleave", onPointerLeave); |
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app.destroy(true, { |
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children: true, |
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texture: true, |
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textureSource: true, |
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context: true |
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}); |
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try { |
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brushTexture.destroy(true); |
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} catch { |
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} |
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container.style.background = priorBackground; |
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}, |
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setAnimating(playing) { |
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animating = playing && !prefersReducedMotion; |
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if (animating) { |
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app.ticker.start(); |
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} else { |
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app.ticker.stop(); |
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} |
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} |
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}; |
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} |
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function step(n, homeX, homeY, x, y, vx, vy, pointerX, pointerY, mouseDx, mouseDy) { |
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const { |
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springK, |
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damping, |
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dragRadius, |
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dragStrength, |
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dragBoost, |
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dragBoostRefSpeed, |
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restVelocityEpsilon |
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} = CONFIG; |
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const dragRadiusSq = dragRadius * dragRadius; |
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const restEpsSq = restVelocityEpsilon * restVelocityEpsilon; |
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const restPosEps = 0.25; |
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const restPosEpsSq = restPosEps * restPosEps; |
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const mouseSpeed = Math.sqrt(mouseDx * mouseDx + mouseDy * mouseDy); |
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const speedMultiplier = 1 + mouseSpeed / dragBoostRefSpeed * dragBoost; |
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const dragFx = mouseDx * dragStrength * speedMultiplier; |
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const dragFy = mouseDy * dragStrength * speedMultiplier; |
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const cursorMoving = mouseDx !== 0 || mouseDy !== 0; |
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for (let i = 0; i < n; i++) { |
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const dhx = homeX[i] - x[i]; |
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const dhy = homeY[i] - y[i]; |
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let fx = dhx * springK; |
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let fy = dhy * springK; |
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const dx = x[i] - pointerX; |
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const dy = y[i] - pointerY; |
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const distSq = dx * dx + dy * dy; |
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let disturbed = false; |
| 293 |
if (cursorMoving && distSq < dragRadiusSq) { |
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const t = 1 - Math.sqrt(distSq) / dragRadius; |
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const falloff = t * t; |
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fx += dragFx * falloff; |
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fy += dragFy * falloff; |
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disturbed = true; |
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} |
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const nvx = (vx[i] + fx) * damping; |
| 301 |
const nvy = (vy[i] + fy) * damping; |
| 302 |
if (!disturbed && nvx * nvx + nvy * nvy < restEpsSq && dhx * dhx + dhy * dhy < restPosEpsSq) { |
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x[i] = homeX[i]; |
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y[i] = homeY[i]; |
| 305 |
vx[i] = 0; |
| 306 |
vy[i] = 0; |
| 307 |
continue; |
| 308 |
} |
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vx[i] = nvx; |
| 310 |
vy[i] = nvy; |
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x[i] += nvx; |
| 312 |
y[i] += nvy; |
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} |
| 314 |
} |
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function buildBrushTexture(pixi) { |
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const size = CONFIG.brushSize; |
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const canvas = document.createElement("canvas"); |
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canvas.width = size; |
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canvas.height = size; |
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const ctx = canvas.getContext("2d"); |
| 321 |
if (!ctx) { |
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throw new Error("[animated-logo-wallpaper] 2D canvas context unavailable."); |
| 323 |
} |
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const center = size / 2; |
| 325 |
const gradient = ctx.createRadialGradient( |
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center, |
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center, |
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0, |
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center, |
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center, |
| 331 |
center |
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); |
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gradient.addColorStop(0, "rgba(255, 255, 255, 1)"); |
| 334 |
gradient.addColorStop(0.18, "rgba(255, 255, 255, 0.85)"); |
| 335 |
gradient.addColorStop(0.42, "rgba(255, 255, 255, 0.28)"); |
| 336 |
gradient.addColorStop(0.75, "rgba(255, 255, 255, 0.06)"); |
| 337 |
gradient.addColorStop(1, "rgba(255, 255, 255, 0)"); |
| 338 |
ctx.fillStyle = gradient; |
| 339 |
ctx.fillRect(0, 0, size, size); |
| 340 |
return pixi.Texture.from(canvas); |
| 341 |
} |
| 342 |
async function sampleLogoHomes(url) { |
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const img = await loadImage(url); |
| 344 |
const maxSide = 400; |
| 345 |
const ratio = img.naturalWidth / img.naturalHeight; |
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const sampleWidth = ratio >= 1 ? maxSide : Math.round(maxSide * ratio); |
| 347 |
const sampleHeight = ratio >= 1 ? Math.round(maxSide / ratio) : maxSide; |
| 348 |
const off = document.createElement("canvas"); |
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off.width = sampleWidth; |
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off.height = sampleHeight; |
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const ctx = off.getContext("2d", { willReadFrequently: true }); |
| 352 |
if (!ctx) { |
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return []; |
| 354 |
} |
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ctx.drawImage(img, 0, 0, sampleWidth, sampleHeight); |
| 356 |
const data = ctx.getImageData(0, 0, sampleWidth, sampleHeight).data; |
| 357 |
const homes = []; |
| 358 |
const stride = CONFIG.sampleStride; |
| 359 |
const threshold = CONFIG.alphaThreshold; |
| 360 |
for (let row = 0; row < sampleHeight; row += stride) { |
| 361 |
const rowOffset = row / stride % 2 === 0 ? 0 : stride / 2; |
| 362 |
for (let col = 0; col < sampleWidth; col += stride) { |
| 363 |
const px = Math.min(sampleWidth - 1, Math.round(col + rowOffset)); |
| 364 |
const py = row; |
| 365 |
const alpha = data[(py * sampleWidth + px) * 4 + 3]; |
| 366 |
if (alpha > threshold) { |
| 367 |
homes.push([px / sampleWidth, py / sampleHeight]); |
| 368 |
} |
| 369 |
} |
| 370 |
} |
| 371 |
return homes; |
| 372 |
} |
| 373 |
function loadImage(url) { |
| 374 |
return new Promise((resolve, reject) => { |
| 375 |
const img = new Image(); |
| 376 |
img.crossOrigin = "anonymous"; |
| 377 |
img.onload = () => resolve(img); |
| 378 |
img.onerror = () => reject(new Error(`Failed to load logo: ${url}`)); |
| 379 |
img.src = url; |
| 380 |
}); |
| 381 |
} |
| 382 |
function applyCanvasLayout(canvas) { |
| 383 |
canvas.style.display = "block"; |
| 384 |
canvas.style.width = "100%"; |
| 385 |
canvas.style.height = "100%"; |
| 386 |
} |
| 387 |
const WALLPAPER_ID = "wp-animated-logo"; |
| 388 |
const PREVIEW = "radial-gradient(circle at 50% 50%, #1e3a8a 0%, #0b0f25 100%)"; |
| 389 |
const def = { |
| 390 |
id: WALLPAPER_ID, |
| 391 |
label: "Animated WordPress Logo", |
| 392 |
type: "canvas", |
| 393 |
preview: PREVIEW, |
| 394 |
needs: ["pixijs"], |
| 395 |
mount: async (container, ctx) => { |
| 396 |
const logoUrl = `${ctx.pluginUrl}/assets/images/wp-logo.png`; |
| 397 |
const scene = await mountScene({ |
| 398 |
container, |
| 399 |
logoUrl, |
| 400 |
prefersReducedMotion: ctx.prefersReducedMotion |
| 401 |
}); |
| 402 |
const NAMESPACE = "desktop-mode/animated-logo"; |
| 403 |
const HOOK = "desktop-mode.wallpaper.visibility"; |
| 404 |
const api = window.wp?.desktop; |
| 405 |
const visibilityHandler = (...args) => { |
| 406 |
const detail = args[0]; |
| 407 |
if (!detail || detail.id !== WALLPAPER_ID) { |
| 408 |
return; |
| 409 |
} |
| 410 |
scene.setAnimating(detail.state === "visible"); |
| 411 |
}; |
| 412 |
api?.hooks?.addAction( |
| 413 |
HOOK, |
| 414 |
`${NAMESPACE}/visibility`, |
| 415 |
visibilityHandler |
| 416 |
); |
| 417 |
return () => { |
| 418 |
api?.hooks?.removeAction(HOOK, `${NAMESPACE}/visibility`); |
| 419 |
scene.destroy(); |
| 420 |
}; |
| 421 |
} |
| 422 |
}; |
| 423 |
window.desktopModeWallpapers = window.desktopModeWallpapers || {}; |
| 424 |
window.desktopModeWallpapers[WALLPAPER_ID] = def; |
| 425 |
})(); |
| 426 |
|
