uni/inf2440/hw4/Sequential.java

class Sequential extends Oblig4 {
	Sequential(NPunkter17 points) {
		super(points);
		name = "Sequential";
	}

	@Override
	void solve() {
		findMinMaxXY();
		MAX_X = x[maxX];
		MAX_Y = y[maxY];

		coHull = pointsRightOf(maxX, minX);
		coHull.append(pointsRightOf(minX, maxX));

		for (int i = 0; i < coHull.size(); ++i) {
			System.out.print(coHull.get(i)+" ");
		}
		System.out.println("");
	}

	void findMinMaxXY() {
		minX = 0;
		maxX = 0;
		minY = 0;
		maxY = 0;

		for (int i = 1; i < n; ++i) {
			int px = x[i];
			if (px < x[minX])
				minX = i;
			if (px > x[maxX])
				maxX = i;

			int py = y[i];
			if (py < y[minY])
				minY = i;
			if (py > y[maxY])
				maxY = i;
		}
	}

	IntList pointsRightOf(int p1, int p2) {
		int p3 = -1;
		double p3dist = 0;

		int a = lineA(p1, p2);
		int b = lineB(p1, p2);
		int c = lineC(p1, p2);

		for (int i = 0; i < n; ++i) {
			if (i == p1 || i == p2)
				continue;

			double line = lineEquation(a, b, c, i);
			if (line > 0)
				continue;

			double dist = Math.abs(dist(line, a, b));
			if (dist > p3dist) {
				p3dist = dist;
				p3 = i;
			}
		}

		if (p3 == -1) {
			IntList l = new IntList(2);
			l.add(p1);
			return l;
		}

		IntList l = pointsRightOf(p1, p3);
		l.append(pointsRightOf(p3, p2));
		return l;
	}
}