/// <summary>
/// Shoot the specified start and target.
/// </summary>
/// <param name="chainsHolder">chain objects holder</param>
/// <param name="start">Start location where the silk is shoot </param>
/// <param name="target">The target location that the silk finally hangs on</param>
/// <returns>true if silking succeeeded, false otherwise</returns>
public bool Shoot(GameObject chainsHolder, Transform start, Transform target, int chainsNumber, Material silkMaterial)
{
_savedChainsHolder = chainsHolder;
Vector2 startPos = start.position;
Vector2 targetPos = target.position;
float distance = Vector2.Distance(startPos, targetPos);
if (distance < 0.1f)
{
Debug.LogWarning("too close to shoot a silk");
return(false);
}
_lineRenderer = chainsHolder.GetComponent <LineRenderer> ();
if (!_lineRenderer)
{
_lineRenderer = chainsHolder.AddComponent <LineRenderer> ();
}
float chainLength = distance / chainsNumber;
Debug.Log("chain length: " + chainLength);
Vector2 chainBoxColliderSize = new Vector2(chainLength, _lineWidth);
float angle = Utils.AngleFromX(start.position - target.position);
float angleRadian = angle * Mathf.Deg2Rad;
Vector2 chainOffset = new Vector2(chainLength * Mathf.Cos(angleRadian), chainLength * Mathf.Sin(angleRadian));
Vector2 currentPos = targetPos + 0.5f * chainOffset;
Quaternion rotation = Quaternion.AngleAxis(angle, Vector3.forward);
// chain objects in reverse order
for (int i = 0; i < chainsNumber; i++)
{
GameObject obj = new GameObject("Chain" + i);
ChainController chainController = obj.AddComponent <ChainController>();
chainController.SetSilk(this);
Rigidbody2D rb2D = obj.AddComponent <Rigidbody2D>();
//rb2D.mass = 1f;
BoxCollider2D box = obj.AddComponent <BoxCollider2D>();
box.size = chainBoxColliderSize;
HingeJoint2D joint = obj.AddComponent <HingeJoint2D>();
if (i == 0)
{
// joint.anchor is always in its local space
joint.anchor = new Vector2(-0.5f * chainLength, 0);
// joint.connectedAnchor in world space since not connected to other
// rigidbody for the first hinge
joint.connectedAnchor = targetPos;
}
else
{
// connect to parent rigid body if not the first chain
joint.connectedBody = _chains[i - 1].GetComponent <Rigidbody2D>();
// joint.anchor is always in my own local space
joint.anchor = new Vector2(-0.5f * chainLength, 0);
// joint.connectedBody now in other object’s local space
joint.connectedAnchor = new Vector2(0.5f * chainLength, 0);
}
obj.transform.SetParent(chainsHolder.transform);
obj.transform.position = currentPos;
obj.transform.rotation = rotation;
obj.transform.localScale = Vector3.one;
_chains.Add(obj);
currentPos += chainOffset;
}
_lineRenderer.SetVertexCount(chainsNumber);
_lineRenderer.SetWidth(_lineWidth, _lineWidth);
_lineRenderer.material = silkMaterial;
for (int i = 0; i < chainsNumber; i++)
{
_lineRenderer.SetPosition(i, _chains[i].transform.position);
}
_state = State.Completed;
return(true);
}
