ICEY/Assets/GameAssets/Games/icey/Scripts/Drawing.cs

using System;
using System.Reflection;
using UnityEngine;

public static class Drawing
{
	static Drawing()
	{
		Drawing.Initialize();
	}

	public static void DrawLine(Vector2 pointA, Vector2 pointB, Color color, float width, bool antiAlias)
	{
		float num = pointB.x - pointA.x;
		float num2 = pointB.y - pointA.y;
		float num3 = Mathf.Sqrt(num * num + num2 * num2);
		if (num3 < 0.001f)
		{
			return;
		}
		Texture2D texture;
		Material mat;
		if (antiAlias)
		{
			width *= 3f;
			texture = Drawing.aaLineTex;
			mat = Drawing.blendMaterial;
		}
		else
		{
			texture = Drawing.lineTex;
			mat = Drawing.blitMaterial;
		}
		float num4 = width * num2 / num3;
		float num5 = width * num / num3;
		Matrix4x4 identity = Matrix4x4.identity;
		identity.m00 = num;
		identity.m01 = -num4;
		identity.m03 = pointA.x + 0.5f * num4;
		identity.m10 = num2;
		identity.m11 = num5;
		identity.m13 = pointA.y - 0.5f * num5;
		GL.PushMatrix();
		GL.MultMatrix(identity);
		Graphics.DrawTexture(Drawing.lineRect, texture, Drawing.lineRect, 0, 0, 0, 0, color, mat);
		GL.PopMatrix();
	}

	public static void DrawCircle(Vector2 center, int radius, Color color, float width, int segmentsPerQuarter)
	{
		Drawing.DrawCircle(center, radius, color, width, false, segmentsPerQuarter);
	}

	public static void DrawCircle(Vector2 center, int radius, Color color, float width, bool antiAlias, int segmentsPerQuarter)
	{
		float num = (float)radius / 2f;
		Vector2 vector = new Vector2(center.x, center.y - (float)radius);
		Vector2 endTangent = new Vector2(center.x - num, center.y - (float)radius);
		Vector2 startTangent = new Vector2(center.x + num, center.y - (float)radius);
		Vector2 vector2 = new Vector2(center.x + (float)radius, center.y);
		Vector2 endTangent2 = new Vector2(center.x + (float)radius, center.y - num);
		Vector2 startTangent2 = new Vector2(center.x + (float)radius, center.y + num);
		Vector2 vector3 = new Vector2(center.x, center.y + (float)radius);
		Vector2 startTangent3 = new Vector2(center.x - num, center.y + (float)radius);
		Vector2 endTangent3 = new Vector2(center.x + num, center.y + (float)radius);
		Vector2 vector4 = new Vector2(center.x - (float)radius, center.y);
		Vector2 startTangent4 = new Vector2(center.x - (float)radius, center.y - num);
		Vector2 endTangent4 = new Vector2(center.x - (float)radius, center.y + num);
		Drawing.DrawBezierLine(vector, startTangent, vector2, endTangent2, color, width, antiAlias, segmentsPerQuarter);
		Drawing.DrawBezierLine(vector2, startTangent2, vector3, endTangent3, color, width, antiAlias, segmentsPerQuarter);
		Drawing.DrawBezierLine(vector3, startTangent3, vector4, endTangent4, color, width, antiAlias, segmentsPerQuarter);
		Drawing.DrawBezierLine(vector4, startTangent4, vector, endTangent, color, width, antiAlias, segmentsPerQuarter);
	}

	public static void DrawBezierLine(Vector2 start, Vector2 startTangent, Vector2 end, Vector2 endTangent, Color color, float width, bool antiAlias, int segments)
	{
		Vector2 pointA = Drawing.CubeBezier(start, startTangent, end, endTangent, 0f);
		for (int i = 1; i < segments + 1; i++)
		{
			Vector2 vector = Drawing.CubeBezier(start, startTangent, end, endTangent, (float)i / (float)segments);
			Drawing.DrawLine(pointA, vector, color, width, antiAlias);
			pointA = vector;
		}
	}

	private static Vector2 CubeBezier(Vector2 s, Vector2 st, Vector2 e, Vector2 et, float t)
	{
		float num = 1f - t;
		return num * num * num * s + 3f * num * num * t * st + 3f * num * t * t * et + t * t * t * e;
	}

	private static void Initialize()
	{
		if (Drawing.lineTex == null)
		{
			Drawing.lineTex = new Texture2D(1, 1, TextureFormat.ARGB32, false);
			Drawing.lineTex.SetPixel(0, 1, Color.white);
			Drawing.lineTex.Apply();
		}
		if (Drawing.aaLineTex == null)
		{
			Drawing.aaLineTex = new Texture2D(1, 3, TextureFormat.ARGB32, false);
			Drawing.aaLineTex.SetPixel(0, 0, new Color(1f, 1f, 1f, 0f));
			Drawing.aaLineTex.SetPixel(0, 1, Color.white);
			Drawing.aaLineTex.SetPixel(0, 2, new Color(1f, 1f, 1f, 0f));
			Drawing.aaLineTex.Apply();
		}
		Drawing.blitMaterial = (Material)typeof(GUI).GetMethod("get_blitMaterial", BindingFlags.Static | BindingFlags.NonPublic).Invoke(null, null);
		Drawing.blendMaterial = (Material)typeof(GUI).GetMethod("get_blendMaterial", BindingFlags.Static | BindingFlags.NonPublic).Invoke(null, null);
	}

	private static Texture2D aaLineTex = null;

	private static Texture2D lineTex = null;

	private static Material blitMaterial = null;

	private static Material blendMaterial = null;

	private static Rect lineRect = new Rect(0f, 0f, 1f, 1f);
}