c# - 如何在一定时间内延长对角线渲染器线

Question

我通过将以下脚本附加到一个空的游戏对象来创建对角线渲染器。如何将线两端的长度延长一半，以及如何沿 x 轴将线延长 1 个单位？两者都在一定时期内。

public class DiagonalLine : MonoBehaviour {

bool firstLineComplete = false;
LineRenderer diagLine;

public Vector3 startPoint = new Vector3 (0, 0, 0);
public Vector3 endPoint = new Vector3 (1.0f, 1.0f, 0);

public float lineDrawSpeed;
// Use this for initialization
void Start () {

    diagLine = gameObject.AddComponent<LineRenderer>();
    diagLine.material = new Material (Shader.Find ("Sprites/Default"));
    diagLine.startColor = diagLine.endColor = Color.green;
    diagLine.startWidth = diagLine.endWidth = 0.15f;

    diagLine.SetPosition (0, startPoint);
    diagLine.SetPosition (1, endPoint);

    }
}

Answer 1

这是基本的矢量数学。

你有一行(从头到尾):

 Vector3 v = start - end;

如果出现以下情况，则每边延伸一半:

 extensionA = start + (v * 0.5f);
 extensionB = end + (v * -0.5f);

如果需要扩展 1，则归一化:

 Vector3 v = (start - end).normalized;
 extensionA = start + v;
 extensionB = end + (v * -1f);