using UnityEngine;
public class MouseTrack : MonoBehaviour
{
public LineRenderer lineRenderer;
private Vector3[] mouseTrackPositions = new Vector3[10];
private Vector3 headPosition;
private Vector3 lastPosition;
private int positionCount = 0;
[Header("设置多远举例记录一个位置")]
public float distanceOfPositions = 0.01f;
private bool firstMouseDown = false;
private bool mouseDown = false;
// Use this for initialization
void Start()
{
}
// Update is called once per frame
void Update()
{
if (Input.GetMouseButtonDown(0))
{
firstMouseDown = true;
mouseDown = true;
}
if (Input.GetMouseButtonUp(0))
{
mouseDown = false;
}
OnDrawLine();
firstMouseDown = false;
}
private void OnDrawLine()
{
if (firstMouseDown == true)
{
positionCount = 0;
headPosition = Camera.main.ScreenToWorldPoint(Input.mousePosition + Camera.main.transform.forward * 0);
lastPosition = headPosition;
}
if (mouseDown == true)
{
headPosition = Camera.main.ScreenToWorldPoint(Input.mousePosition + new Vector3(0, 0, 10));
if (Vector3.Distance(headPosition, lastPosition) > distanceOfPositions)
{
SavePosition(headPosition);
positionCount++;
}
lastPosition = headPosition;
}
else
{
mouseTrackPositions = new Vector3[10];
}
SetLineRendererPosition(mouseTrackPositions);
}
private void SavePosition(Vector3 pos)
{
pos.z = 0;
if (positionCount <= 9)
{
for (int i = positionCount; i < 10; i++)
{
mouseTrackPositions[i] = pos;
}
}
else
{
for (int i = 0; i < 9; i++)
{
mouseTrackPositions[i] = mouseTrackPositions[i + 1];
}
mouseTrackPositions[9] = pos;
}
}
private void SetLineRendererPosition(Vector3[] positions)
{
lineRenderer.SetPositions(positions);
}
}
