51 lines
1.5 KiB
C#
51 lines
1.5 KiB
C#
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using UnityEngine;
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using System.Collections;
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public static class Physics2DExtensions {
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public static Vector2 GetWorldPointVelocityEx(this Rigidbody2D body, Vector2 worldPoint) {
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var physics = body.GetComponent<Physics2DEx>();
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if (physics != null) {
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return physics.GetWorldPointVelocity(worldPoint);
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}
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return body.GetPointVelocity(worldPoint);
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}
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}
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[RequireComponent(typeof(Rigidbody2D))]
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public class Physics2DEx : MonoBehaviour {
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private Vector2 _velocity;
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private float _angularVelocity;
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public float AngularVelocity {
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get { return _angularVelocity; }
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}
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private Rigidbody2D _rigidBody;
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// Use this for initialization
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void Start () {
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_rigidBody = GetComponent<Rigidbody2D>();
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}
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void FixedUpdate() {
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_velocity = _rigidBody.velocity;
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_angularVelocity = _rigidBody.angularVelocity;
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}
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public Vector2 GetWorldPointVelocity(Vector2 worldPoint) {
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if (_rigidBody == null) {
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_rigidBody = GetComponent<Rigidbody2D>();
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if (_rigidBody == null) {
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Debug.LogErrorFormat(gameObject, "Physics2DEx requires component RigidBody2D! {0}", name);
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return Vector2.zero;
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}
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}
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var radiusVector = worldPoint - _rigidBody.worldCenterOfMass;
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return (Vector3)_velocity + Vector3.Cross(Vector3.forward * (_angularVelocity * Mathf.Deg2Rad), (Vector3)radiusVector);
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}
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// Update is called once per frame
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void Update () {
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}
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}
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