CrosshairType2.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.UI;

public class CrosshairType2 : MonoBehaviour
{
	[SerializeField] List<Image> _crosshairParts;
	[SerializeField] List<Image> _crosshairOutlineParts;

	[SerializeField] Image _crosshairDot;
	[SerializeField] Image _crosshairDotOutline;

	[SerializeField] protected int _crosshairLength = 20;
	[SerializeField] protected int _crosshairGap = 8;
	[SerializeField] protected int _crosshairThickness = 1;
	[SerializeField] protected int _crosshairOutlineThickness = 1;

	[SerializeField] protected Color _crosshairColor = Color.white;
	[SerializeField] protected Color _crosshairOutlineColor = Color.black;

	[SerializeField] protected int _dotSize = 1;
	[SerializeField] protected int _dotOutlineThickness = 1;

	[SerializeField] protected Color _dotColor = Color.white;
	[SerializeField] protected Color _dotOutlineColor = Color.black;


	[SerializeField] protected bool _renderCrosshairRight = true;
	[SerializeField] protected bool _renderCrosshairLeft = true;
	[SerializeField] protected bool _renderCrosshairTop = true;
	[SerializeField] protected bool _renderCrosshairBottom = true;

	// Use this for initialization
	protected void Awake ()
	{
		UpdateCrosshair();
	}


	protected void UpdateCrosshair()
	{
		_crosshairParts[0].gameObject.SetActive(_renderCrosshairRight);
		_crosshairParts[1].gameObject.SetActive(_renderCrosshairLeft);
		_crosshairParts[2].gameObject.SetActive(_renderCrosshairTop);
		_crosshairParts[3].gameObject.SetActive(_renderCrosshairBottom);

		_crosshairOutlineParts[0].gameObject.SetActive(_renderCrosshairRight);
		_crosshairOutlineParts[1].gameObject.SetActive(_renderCrosshairLeft);
		_crosshairOutlineParts[2].gameObject.SetActive(_renderCrosshairTop);
		_crosshairOutlineParts[3].gameObject.SetActive(_renderCrosshairBottom);

		_crosshairDot.color = _dotColor;
		_crosshairDotOutline.color = _dotOutlineColor;

		_crosshairDot.rectTransform.sizeDelta = new Vector2(_dotSize * 2, _dotSize * 2);
		_crosshairDotOutline.rectTransform.sizeDelta = new Vector2((_dotSize + _dotOutlineThickness) * 2, (_dotSize + _dotOutlineThickness) * 2);
		
		OutLineParts();
		FillParts();
	}

	void OutLineParts()
	{
		Texture2D texture = new Texture2D(200, 100, TextureFormat.ARGB32, false, true);
		texture.filterMode = FilterMode.Point;

		Color outlineColor = _crosshairOutlineColor;

		Color32[] newColors = Enumerable.Repeat(new Color32(0, 0, 0, 0), texture.width * texture.height).ToArray();
		texture.SetPixels32(newColors);

		for (int x = -_crosshairOutlineThickness; x < _crosshairLength + _crosshairOutlineThickness; x++)
		{
			for (int i = 0; i < _crosshairThickness + _crosshairOutlineThickness; i++)
			{
				int renderX = texture.width - 1 - _crosshairGap - x;
				int renderY1 = 49 - i;
				int renderY2 = 50 + i;

				if (renderX >= 0 && renderX < texture.width && renderY1 >= 0 && renderY1 < texture.height) 
					texture.SetPixel(renderX, renderY1, outlineColor);

				if (renderX >= 0 && renderX < texture.width && renderY1 >= 0 && renderY2 < texture.height)
					texture.SetPixel(renderX, renderY2, outlineColor);

			}
		}

		texture.Apply();

		var sprite = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), new Vector2(0.5f, 0.5f));


		foreach (var crosshairPart in _crosshairOutlineParts)
		{
			crosshairPart.sprite = sprite;
		}
	}

	void FillParts()
	{
		Texture2D texture = new Texture2D(200, 100, TextureFormat.ARGB32, false, true);
		texture.filterMode = FilterMode.Point;

		Color color = _crosshairColor;

		Color32[] newColors = Enumerable.Repeat(new Color32(0, 0, 0, 0), texture.width * texture.height).ToArray();
		texture.SetPixels32(newColors);

		for (int x = 0; x < _crosshairLength; x++)
		{
			for (int i = 0; i < _crosshairThickness; i++)
			{
				int renderX = texture.width - 1 - _crosshairGap - x;
				int renderY1 = 49 - i;
				int renderY2 = 50 + i;

				if (renderX >= 0 && renderX < texture.width && renderY1 >= 0 && renderY1 < texture.height)
					texture.SetPixel(renderX, renderY1, color);

				if (renderX >= 0 && renderX < texture.width && renderY1 >= 0 && renderY2 < texture.height)
					texture.SetPixel(renderX, renderY2, color);
			}
		}

		texture.Apply();

		var sprite = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), new Vector2(0.5f, 0.5f));


		foreach (var crosshairPart in _crosshairParts)
		{
			crosshairPart.sprite = sprite;
		}
	}

	//These are for showing spread
	void Grow()
	{
		_crosshairParts[0].transform.position += Vector3.right;
		_crosshairParts[1].transform.position -= Vector3.right;
		_crosshairParts[2].transform.position += Vector3.up;
		_crosshairParts[3].transform.position -= Vector3.up;
	}

	void UnGrow()
	{
		_crosshairParts[0].transform.position -= Vector3.right;
		_crosshairParts[1].transform.position += Vector3.right;
		_crosshairParts[2].transform.position -= Vector3.up;
		_crosshairParts[3].transform.position += Vector3.up;
	}
}