رسم خط در یونیتی با کد سیشارپ

منبع:gameover.blog.ir

using UnityEngine;
using System.Collections;

public class DrawLine : MonoBehaviour
{
 //reference to LineRenderer component
 private LineRenderer line; 
 //car to store mouse position on the screen
 private Vector3 mousePos;
 //assign a material to the Line Renderer in the Inspector
 public Material material;
 //number of lines drawn
 private int currLines = 0;

 void Update ()
 {
  //Create new Line on left mouse click(down)
  if(Input.GetMouseButtonDown(0))
  {
   //check if there is no line renderer created
   if(line == null){
    //create the line
    createLine();
   }
   //get the mouse position
   mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
   //set the z co ordinate to 0 as we are only interested in the xy axes
   mousePos.z = 0;
   //set the start point and end point of the line renderer
   line.SetPosition(0,mousePos);
   line.SetPosition(1,mousePos);
  }
  //if line renderer exists and left mouse button is click exited (up)
  else if(Input.GetMouseButtonUp(0) && line)
  {
   mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
   mousePos.z = 0;
   //set the end point of the line renderer to current mouse position
   line.SetPosition(1,mousePos);
   //set line as null once the line is created
   line = null;
   currLines++;
  }
  //if mouse button is held clicked and line exists
  else if(Input.GetMouseButton(0) && line)
  {
   mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
   mousePos.z = 0;
   //set the end position as current position but dont set line as null as the mouse click is not exited
   line.SetPosition(1, mousePos);
  }
 }
 
 //method to create line
 private void createLine()
 {
  //create a new empty gameobject and line renderer component
  line = new GameObject("Line"+currLines).AddComponent<LineRenderer>();
  //assign the material to the line
  line.material =  material;
  //set the number of points to the line
  line.SetVertexCount(2);
  //set the width
  line.SetWidth(0.15f,0.15f);
  //render line to the world origin and not to the object's position
  line.useWorldSpace = true;  

 }
}

منبع اصلی:
http://www.thegamecontriver.com/2015/05/how-to-draw-line-on-screen-in-unity-csharp.html