Method quadTo

src/main/java/field/graphics/FLine.java:299–310

draws a curve from the current position, towards (but not through) `q1x, q1y`, then onto `x, y`.

(double q1x, double q1y, double x, double y)

		double c1x = (at.x + q1x * 2) / 3;
		double c1y = (at.y + q1y * 2) / 3;
		double c2x = (at.x * 2 + q1x) / 3;
		double c2y = (at.y * 2 + q1y) / 3;

		return cubicTo(c1x, c1y, c2x, c2y, x, y);
	}

	/**
	 * draws a curve from the current position, towards (but not through) the relative position `q1x, q1y`, then onto + `x, y`.
	 */
	public FLine quadToRel(double q1x, double q1y, double x, double y) {
		if (nodes.size() == 0) return moveTo(x, y);

		Vec3 at = last().to;

		return quadTo(at.x + q1x, at.y + q1y, at.x + x, at.y + y);