32 lines
1.5 KiB
JavaScript
32 lines
1.5 KiB
JavaScript
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"use strict";
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// Layer: physics/projection-bridge
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// Shared tiny helpers for positional projection used by links, mechanical
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// bodies, and circle/circle collision code.
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(function (global) {
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function num(v, fallback = 0) { const n = Number(v); return Number.isFinite(n) ? n : fallback; }
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function markSpatialDirty(worldRef, item, reason = "projection", threshold = 0.35, minInterval = 0.065) {
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const world = worldRef || item?.world || null;
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if (!world || !item) return false;
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const now = Number(world.time || 0) || 0;
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const x = num(item.x), y = num(item.y), r = num(item.r || item.radius || 0);
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const lastX = Number(item._lastProjectionSpatialDirtyX);
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const lastY = Number(item._lastProjectionSpatialDirtyY);
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const lastR = Number(item._lastProjectionSpatialDirtyR);
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const missing = !Number.isFinite(lastX) || !Number.isFinite(lastY) || !Number.isFinite(lastR);
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const moved = missing || Math.hypot(x - lastX, y - lastY) > threshold || Math.abs(r - lastR) > threshold;
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const due = now >= Number(item._nextProjectionSpatialDirtyAt || 0);
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if (!moved && !due) return false;
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item._lastProjectionSpatialDirtyX = x;
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item._lastProjectionSpatialDirtyY = y;
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item._lastProjectionSpatialDirtyR = r;
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item._nextProjectionSpatialDirtyAt = now + Math.max(0.016, num(minInterval, 0.065));
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world.markSpatialDirty?.(reason);
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return true;
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}
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global.TarinaiPhysicsProjectionSystem = Object.freeze({
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markSpatialDirty,
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});
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})(typeof window !== "undefined" ? window : globalThis);
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