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"; status.textContent = "A frame could not load"; }; img.src = getURL(i); } } /* ========================= POINTER DOWN ========================= */ function pointerDown(e) { if (!ready) return; dragging = true; lastX = e.clientX; lastPointerTime = performance.now(); velocity = 0; targetVelocity = 0; hint.style.opacity = ".18"; try { stage.setPointerCapture( e.pointerId ); } catch (_) {} startLoop(); } /* ========================= POINTER MOVE ========================= */ function pointerMove(e) { if ( !dragging || !ready ) return; const now = performance.now(); const dx = e.clientX - lastX; const dt = Math.max( 8, now - lastPointerTime ); /* Finger directly controls sequence position. */ const frameMovement = dx / PIXELS_PER_FRAME; position += frameMovement; /* Calculate velocity for release/inertia. */ targetVelocity = frameMovement * (16.67 / dt); targetVelocity = Math.max( -MAX_SPEED, Math.min( MAX_SPEED, targetVelocity ) ); /* Smooth velocity measurement. */ velocity = velocity * 0.35 + targetVelocity * 0.65; lastX = e.clientX; lastPointerTime = now; draw(); updateBar(); } /* ========================= RELEASE ========================= */ function pointerUp() { if (!dragging) return; dragging = false; hint.style.opacity = "1"; startLoop(); } /* ========================= ANIMATION LOOP ========================= */ function startLoop() { if (raf !== null) return; lastRenderTime = performance.now(); raf = requestAnimationFrame( animate ); } function animate(now) { const dt = Math.min( 32, now - lastRenderTime ); lastRenderTime = now; const scale = dt / 16.67; if (!dragging) { position += velocity * scale; velocity *= Math.pow( FRICTION, scale ); if ( Math.abs(velocity) < STOP_SPEED ) { velocity = 0; } draw(); updateBar(); } if ( dragging || Math.abs(velocity) >= STOP_SPEED ) { raf = requestAnimationFrame( animate ); } else { raf = null; updateBar(); } } /* ========================= EVENTS ========================= */ stage.addEventListener( "pointerdown", pointerDown ); stage.addEventListener( "pointermove", pointerMove ); stage.addEventListener( "pointerup", pointerUp ); stage.addEventListener( "pointercancel", pointerUp ); /* Prevent image-style long press behavior around interactive area. */ stage.addEventListener( "contextmenu", e => e.preventDefault() ); /* ========================= START ========================= */ preload(); })(); Sensitive Content 🔞
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