Unity 使用LineRenderer 画箭头

using UnityEngine;
using System.Collections;

public class LineRendererScript : MonoBehaviour
{
[SerializeField]
private LineRenderer BodyLineRenderer;
[SerializeField]
private LineRenderer HeadLineRenderer;

private bool IsFinished = false;
private bool IsReady = false;
private Vector3 StartPos;
private Vector3 EndPos;

private float zDepth = 10f;
private float headWidth = 0.4f;
private float bodyWidth = 0.3f;

void Awake()
{
if(BodyLineRenderer == null)
BodyLineRenderer = GetComponent<LineRenderer>();
}

void Update()
{
if(IsFinished)
return;

if(Input.GetMouseButtonDown(0))
{
IsReady = true;
StartPos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
StartPos.z = zDepth;
}
else if(Input.GetMouseButtonUp(0))
{
IsReady = false;
IsFinished = true;
}

if(IsReady)
{
EndPos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
EndPos.z = zDepth;

BodyLineRenderer.SetPosition(0, StartPos);
BodyLineRenderer.SetPosition(1, EndPos);

// 设置头部
Vector3 HeadStart = EndPos;
Vector3 HeadEnd = HeadStart;

Vector3 direction = EndPos - StartPos;

// 根据当前线的长短，适当的调整箭头的大小
if(direction.magnitude > 2)
{
headWidth = 0.4f;
bodyWidth = 0.2f;
}
else if(direction.magnitude > 1)
{
headWidth = 0.3f;
bodyWidth = 0.15f;
}
else
{
headWidth = 0.2f;
bodyWidth = 0.1f;
}
HeadLineRenderer.SetWidth(headWidth, 0);
BodyLineRenderer.SetWidth(0, bodyWidth);

direction.Normalize();
HeadEnd = HeadEnd + direction * headWidth;

HeadLineRenderer.SetPosition(0, HeadStart);
HeadLineRenderer.SetPosition(1, HeadEnd);
}
}

}