Method addFrame

packages/melonjs/src/physics/bounds.ts:315–355

* Expands this bounds to include the axis-aligned bounding box of * the given rect's four corners, optionally transformed through `m` * first. With a non-identity `m` (rotation, scale, etc.) the result * is the AABB of the transformed quad, not a transformed AABB. * @param x0 - The left x co

(
		x0: number,
		y0: number,
		x1: number,
		y1: number,
		m?: Matrix2d | Matrix3d,
	)

	 * @param [m] - An optional transform applied to each corner before inclusion.
	 */
	addFrame(
		x0: number,
		y0: number,
		x1: number,
		y1: number,
		m?: Matrix2d | Matrix3d,
	) {
		if (m === undefined || m.isIdentity()) {
			// no transform (or a no-op transform): fold the 4 corners'
			// min/max directly into the AABB without any Point or
			// `m.apply` work. Mirrors `addPoint` for each corner —
			// using Math.min/max so the caller may pass swapped corners
			// (x1 < x0 etc.) without breaking.
			const minX = Math.min(x0, x1);
			const maxX = Math.max(x0, x1);
			const minY = Math.min(y0, y1);
			const maxY = Math.max(y0, y1);
			if (minX < this.min.x) {
				this.min.x = minX;
			}
			if (maxX > this.max.x) {
				this.max.x = maxX;
			}
			if (minY < this.min.y) {
				this.min.y = minY;
			}
			if (maxY > this.max.y) {
				this.max.y = maxY;
			}
			return;
		}
		// transformed: walk the 4 corners through `m` via `addPoint`.
		// Reuse the module-level scratch — `m.apply` mutates in place
		// and `addPoint` reads x/y immediately after, so the same Point
		// can shuttle through all four corners.
		const v = _addFrameScratch;
		this.addPoint(v.set(x0, y0), m);
		this.addPoint(v.set(x1, y0), m);
		this.addPoint(v.set(x0, y1), m);
		this.addPoint(v.set(x1, y1), m);
	}

	/**
	 * Returns true if the bounds contain the given point or vector.