ballshoot.cs

		ballToMouse = new Ray (ballPos.transform.position, Vector3.zero);
		forceDir.z = 0f;

			if (Input.GetMouseButtonDown (0)) {
				mouseOrigin = Camera.main.ScreenToWorldPoint (Input.mousePosition);  
				mouseOrigin.z = 0f;
				isPanning = true;

			} else if (isPanning) {
				Vector2 mouseDist = currentPos - mouseOrigin;
				forceDir = mouseOrigin - currentPos;
				magnitude = Mathf.Clamp (forceDir.magnitude, 1f, maxStretch);
				currentPos = Camera.main.ScreenToWorldPoint (Input.mousePosition);
				currentPos.z = 0f;

					if (mouseDist.sqrMagnitude > maxStretchSqr) {
						ballToMouse.direction = forceDir;
						currentPos = ballToMouse.GetPoint (maxStretch);
						forceDir = ballToMouse.GetPoint (maxStretch);
						shotDir.SetPosition (0, ballPos.transform.position);
						shotDir.SetPosition (1, ballToMouse.GetPoint(maxStretch));
					} else {
						shotDir.SetPosition (0, ballPos.transform.position);
						shotDir.SetPosition (1, ballPos.transform.position + forceDir);
					}
			}