1 files changed, 0 insertions, 71 deletions
diff --git a/collision.c b/collision.c
index 334256e..3890f66 100644
--- a/collision.c
+++ b/collision.c
@@ -8,74 +8,3 @@ iscollision(Point p, Point q) {
 	dy = p.y - q.y;
 	return (dx*dx + dy*dy) <= 4*RADIUS*RADIUS;
 }
-
-/* TODO: remove
-int
-collision(Ball b1, Ball b2, Point *p) {
-	Point l1, l2, d;
-	int dx, dy, closestdistsq, backdist, mvmtveclen;
-
-	l1 = b1.p;
-	l2 = Pt(b.p.x+b.v.x, b.p.y+b.v.y);
-	d = closestpointonline(L(l1, l2), b2.p));
-
-	dx = b2.p.x - d.x;
-	dy = b2.p.y - d.y;
-	closestdistsq = dx*dx + dy*dy;
-
-	if (closestdistsq > 4*RADIUS*RADIUS)
-		return 0;
-
-	backdist = sqrt(4*RADIUS*RADIUS - closestdistsq);
-	mvmtveclen = vlen(b1.v);
-	p->x = d.x - backdist * (b1.v.x / mvmtveclen);
-	p->y = d.y - backdist * (b1.v.y / mvmtveclen);
-	return 1;
-}
-
-Vec
-vpostcollision(Ball b1, Ball b2) {
-	Point c1, c2;
-	int dcx, dcy, d;
-	Vec n;
-
-	if (!collision(b1, b2, &c1)) {
-		printf("warning: vpostcollision called, but no collision\n");
-		return b1.v;
-	}
-	if (!collision(b2, b1, &c2)) {
-		printf("warning: vpostcollision called, but no collision\n");
-		return b1.v;
-	}
-
-	d = norm(vsub(c1, c2));
-	n = V(dcx/d, dcy/d);
-	p = 2 * (vdot(b1.v, n) - vdot(b2.v, n)) / (b1.m + b2.m);
-	
-	b1.v.x = b1.v.x - p * b1.m * n.x;
-	b1.v.y = b1.v.y - p * b1.m * n.y;
-	return b1.v;
-}
-
-Point
-closestpointonline(Line l, Point p) {
-	int a, b, c1, c2, d;
-	Point c;
-	
-	a = l.p2.y - l.p1.y;
-	b = l.p1.x - l.p2.x;
-
-	c1 = a*l.p1.x + b*l.p1.y;
-	c2 = -b*p.x + a*p.y;
-
-	d = a*a - -b*b;
-	if (d != 0) {
-		c.x = (a*c1 - b*c2) / d;
-		c.y = (a*c2 + b*c1) / d;
-	} else {
-		c = p;
-	}
-
-	return c;
-}
-*/