arc_8()

in assets/js/railroad.js [177:205]

• 28 lines of code
• 18 McCabe index (conditional complexity)

	arc_8(start, dir) {
		// 1/8 of a circle
		const arc = Options.AR;
		const s2 = 1/Math.sqrt(2) * arc;
		const s2inv = (arc - s2);
		let path = "a " + arc + " " + arc + " 0 0 " + (dir=='cw' ? "1" : "0") + " ";
		const sd = start+dir;
		const offset =
			sd == 'ncw'   ? [s2, s2inv] :
			sd == 'necw'  ? [s2inv, s2] :
			sd == 'ecw'   ? [-s2inv, s2] :
			sd == 'secw'  ? [-s2, s2inv] :
			sd == 'scw'   ? [-s2, -s2inv] :
			sd == 'swcw'  ? [-s2inv, -s2] :
			sd == 'wcw'   ? [s2inv, -s2] :
			sd == 'nwcw'  ? [s2, -s2inv] :
			sd == 'nccw'  ? [-s2, s2inv] :
			sd == 'nwccw' ? [-s2inv, s2] :
			sd == 'wccw'  ? [s2inv, s2] :
			sd == 'swccw' ? [s2, s2inv] :
			sd == 'sccw'  ? [s2, -s2inv] :
			sd == 'seccw' ? [s2inv, -s2] :
			sd == 'eccw'  ? [-s2inv, -s2] :
			sd == 'neccw' ? [-s2, -s2inv] : null
		;
		path += offset.join(" ");
		this.attrs.d += path;
		return this;
	}