Unity 通过LineRenderer绘制两点之间的直线操作

private linerenderer line;
//画线
line = this.gameobject.addcomponent<linerenderer>();
//只有设置了材质 setcolor才有作用
line.material = new material(shader.find("particles/additive"));
line.setvertexcount(2);//设置两点
line.setcolors(color.yellow, color.red); //设置直线颜色
line.setwidth(0.01f, 0.01f);//设置直线宽度
//设置指示线的起点和终点
line.setposition(0, initposition);
line.setposition(1, newposition);

 public float r;//半径
 public int n;//不要超过45
 line.setvertexcount(n+1);//这里要加1,达成闭合曲线
 for (int i = 0; i < n + 1; i++)
{
  float x = r * mathf.cos((360 / n * i) * mathf.deg2rad) + transform.position.x; //确定x坐标
  float z = r * mathf.sin((360 / n * i) * mathf.deg2rad) + transform.position.z; //确定z坐标
  line.setposition(i, new vector3(x, transform.position.y, z));         
}

using system.collections;
using system.collections.generic;
using unityengine; 
public class drawlinebymouse : monobehaviour { 
    //画线组件预制体
    public transform gestureonscreenprefab; 
    private int strokeid = -1; 
    private vector3 virtualkeyposition = vector2.zero;
    private rect drawarea;
    private runtimeplatform platform;
    private int vertexcount = 0; 
    private list<linerenderer> gesturelinesrenderer = new list<linerenderer>();
    private linerenderer currentgesturelinerenderer; 
    //gui
    private string message="what is this ?";
    private bool recognized;
    private string newgesturename = ""; 
    void start()
    {
        platform = application.platform;
        drawarea = new rect(0, 0, screen.width - screen.width / 3, screen.height);
    } 
    void update()
    { 
        if (platform == runtimeplatform.android || platform == runtimeplatform.iphoneplayer)
        {
            if (input.touchcount > 0)
            {
                virtualkeyposition = new vector3(input.gettouch(0).position.x, input.gettouch(0).position.y);
            }
        }
        else
        {
            if (input.getmousebutton(0))
            {
                virtualkeyposition = new vector3(input.mouseposition.x, input.mouseposition.y);
            }
        }
 
        if (drawarea.contains(virtualkeyposition))
        {
 
            if (input.getmousebuttondown(0))
            {
               ++strokeid;
 
               // transform tmpgesture = instantiate(gestureonscreenprefab, transform.position, transform.rotation) as transform;
               // currentgesturelinerenderer = tmpgesture.getcomponent<linerenderer>();
 
                gameobject go = new gameobject("linerenderer");
                go.transform.position = camera.main.transform.position;
                go.transform.rotation = camera.main.transform.rotation;
                currentgesturelinerenderer = go.addcomponent<linerenderer>();              
                currentgesturelinerenderer.startwidth = 0.1f; 
                gesturelinesrenderer.add(currentgesturelinerenderer); 
                vertexcount = 0;
            }
 
            if (input.getmousebutton(0))
            {            
                currentgesturelinerenderer.setvertexcount(++vertexcount);
                currentgesturelinerenderer.setposition(vertexcount - 1, camera.main.screentoworldpoint(new vector3(virtualkeyposition.x, virtualkeyposition.y, 10)));
            }
        }
    } 
    void ongui()
    {
 
        gui.box(drawarea, "draw area"); 
        gui.label(new rect(10, screen.height - 40, 500, 50), message); 
        if (gui.button(new rect(screen.width - 100, 10, 100, 30), "clear line"))
        {
            foreach (linerenderer linerenderer in gesturelinesrenderer)
            {
                linerenderer.setvertexcount(0);
                destroy(linerenderer.gameobject);
            }
            gesturelinesrenderer.clear();
            recognized = true;
 
        }
    }
}