Unity Line-Renderer

绘制线条的组件

1. 参数列表

参数名	描述
大小	绘制线条关键点的数量，将点依次连接
颜色	绘制线条的颜色
角顶点	折点处顶点数量
末端顶点	末端处顶点数量

2. 代码参数列表

// 新建一条线
GameObject go = new GameObject();
go.AddComponent<LineRenderer>();

参数名	描述
material	材质
startWidth	起始宽度
endWidth	末端宽度
startColor	起始颜色
endColor	末端颜色
numCornerVertices	角顶点
numCapVertices	末端顶点
positionCount	顶点数量

2. 函数列表

参数名	描述
SetPositions(Vector3[])	顶点集合

3. 画笔示例

// 画笔颜色
[SerializeField] Color paintColor = Color.red;
// 画笔宽度
[SerializeField] float paintSize = 0.2f;
// 画笔材质
[SerializeField] Material lineMaterial;

LineRenderer currentLine;
List<Vector3> positions = new List<Vector3>();
bool IsMouseDown = false;

public void ChangeColor(int value)
{
    
    if(value == 0)
        paintColor = Color.red;
    if (value == 1)
        paintColor = Color.green;
    if (value == 2)
        paintColor = Color.blue;
}

public void ChangeSize(float pse)
{
    
    paintSize = pse;
}

private void Update()
{
    
    if (Input.GetMouseButtonDown(0))
    {
    
        GameObject go = new GameObject();
        go.transform.SetParent(this.transform);
        currentLine = go.AddComponent<LineRenderer>();
        currentLine.material = lineMaterial;
        currentLine.startWidth = paintSize;
        currentLine.endWidth = paintSize;
        currentLine.startColor = paintColor;
        currentLine.endColor = paintColor;
        currentLine.numCornerVertices = 5;
        currentLine.numCapVertices = 5;

        positions.Clear();
        AddPosition();
        IsMouseDown = true;
    }

    if(IsMouseDown)
    {
    
        AddPosition();
    }

    if (Input.GetMouseButtonUp(0))
    {
    
        IsMouseDown = false;
    }
}

void AddPosition()
{
    
    Vector3 position = GetMousePoint();
    positions.Add(position);
    currentLine.positionCount = positions.Count;
    currentLine.SetPositions(positions.ToArray());
}

Vector3 GetMousePoint()
{
    
    Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
    RaycastHit hit;
    bool flag = Physics.Raycast(ray, out hit);
    if(flag)
    {
    
        return hit.point - Vector3.forward / 100;
    }
    return Vector3.zero;
}