MagicMarker.cs

using UnityEngine;
using System.Collections;

public class MagicMarker : MonoBehaviour {
	private GameObject Block;
//	private float mouseX0;
//	private float mouseY0;
//	private float mouseX1;
//	private float mouseY1;
	private Vector3 mousePos1;
	private Vector3 mousePos2;
	private Vector3 blockRotation;
	private Vector3 blockDrawPos;
	private bool canDraw = true;
	private Component inkUsed;

	// Use this for initialization
	void Start () 
	{
		Block = Resources.Load("Block") as GameObject;
		inkUsed = GameObject.FindWithTag("MainCamera").GetComponent("InkLimit");
	
	}
	
	// Update is called once per frame
	void Update () 
	{
		//if(canDraw == true)
		//{
			if(Input.GetKeyDown(KeyCode.Mouse0))
			{
				StartCoroutine("DrawingBlocks");
			}
			if(Input.GetKeyUp (KeyCode.Mouse0))
			{
				StopCoroutine("DrawingBlocks");
			}
		//}
	
	}
	void DrawSwitchOff()
	{
		canDraw = false;
	}
	void DrawSwitchOn()
	{
		canDraw = true;
	}
	IEnumerator DrawingBlocks()
	{
		mousePos1 = Camera.main.ScreenToWorldPoint(Input.mousePosition);
		while(true)
		{
			
			yield return new WaitForSeconds(0.01f);
			mousePos2 = Camera.main.ScreenToWorldPoint(Input.mousePosition);
			blockDrawPos = new Vector3 ((mousePos1.x + mousePos2.x) / 2, (mousePos1.y + mousePos2.y) / 2, 0);
			blockRotation = new Vector3(mousePos2.x - mousePos1.x, mousePos2.y - mousePos1.y, 0);
			if(mousePos1 != mousePos2)
			{
				GameObject clone;
				if(canDraw == true)
				{
				clone = Instantiate(Block, blockDrawPos, Quaternion.LookRotation(blockRotation)) as GameObject;
				inkUsed.SendMessage("inkUsed",1);
				clone.gameObject.transform.localScale += new Vector3 (0, 0, Vector3.Distance(mousePos1, mousePos2));
				}
			}
			mousePos1 = mousePos2;
		}
		
	}
}