Source –> https://gist.github.com/chkn/4748252

using System;
using System.Linq;

public static class JSON 
{
    public static string Stringify (object obj)
    {
        string str;
        if (obj == null) return "null";
        if (obj is ValueType) return obj.ToString ().ToLowerInvariant ();
        if ((str = obj as string) != null) return System.Text.RegularExpressions.Regex.Escape (str);

        // assume it's a POCO
        return "{" + string.Join (",",
            from p in obj.GetType ().GetProperties ()
            let json = (JSONAttribute) p.GetCustomAttributes (typeof (JSONAttribute), true).FirstOrDefault ()
            where json != null
            select "\"" + (json.Key ?? p.Name) + "\":" + Stringify (p.GetValue (obj, null))
        ) + "}";
    }
}

public class JSONAttribute : Attribute
{
    public string Key { get; set; }
    public JSONAttribute () {}    
    public JSONAttribute (string key) { Key = key; }
}

        /// <summary>
        /// Determines if this rectangle intersects with rect.
        /// </summary>
        /// <param name="rect">
        /// The rectangle to test.
        /// </param>
        /// <returns>
        /// This method returns true if there is any intersection, otherwise false.
        /// </returns>
        public bool Intersects(RectangleF rect)
        {
            return !((this.X > rect.Right) || (this.Right < rect.Left) || (this.Y > rect.Bottom) || (this.Bottom < rect.Top));
        }

        /// <summary>
        /// Replaces this RectangleF with the intersection of itself and the specified RectangleF.
        /// </summary>
        /// <param name="rect">
        /// The RectangleF with which to intersect.
        /// </param>
        public void Intersect(RectangleF rect)
        {
            this.X = Math.Max(this.Left, rect.Left);
            this.Y = Math.Max(this.Top, rect.Top);
            this.Width = Math.Min(this.Right, rect.Right) - this.X;
            this.Height = Math.Min(this.Bottom, rect.Bottom) - this.Y;
        }

        /// <summary>
        /// Returns a third RectangleF structure that represents the intersection of two other RectangleF structures. 
        /// If there is no intersection, an empty RectangleF is returned.
        /// </summary>
        /// <param name="a">
        /// A rectangle to intersect.   
        /// </param>
        /// <param name="b">
        /// B rectangle to intersect.  
        /// </param>
        /// <returns>
        /// A RectangleF that represents the intersection of a and b.
        /// </returns>
        public static RectangleF Intersect(RectangleF a, RectangleF b)
        {
            float x = Math.Max((sbyte)a.X, (sbyte)b.X);
            float num2 = Math.Min(a.X + a.Width, b.X + b.Width);
            float y = Math.Max((sbyte)a.Y, (sbyte)b.Y);
            float num4 = Math.Min(a.Y + a.Height, b.Y + b.Height);
            if ((num2 >= x) && (num4 >= y))
            {
                return new RectangleF(x, y, num2 - x, num4 - y);
            }

            return Empty;
        }

I’ve recently come across what initially seems like a bug with the Unity 4 editor. it involves the use of the Resources.Load method from within a class marked InitializeOnLoad.

Take the fallowing example code …

namespace CBX.CoreProjectCode
{
    using UnityEditor;

    using UnityEngine;

    [InitializeOnLoad]
    public class EditorInitialization
    {
        static EditorInitialization()
        {
            LoadData(); // this will fail to see the test.txt file in the resource folder
        }     

        private static void LoadData()
        {
            // try to load data
            var data = Resources.Load("test", typeof(TextAsset)) as TextAsset;
            if (data == null)
            {
                Debug.LogWarning("No data found");
                return;
            }

            Debug.Log(data.text);
        }
    }
}

After Unity compiles the scripts it will invoke any static constructors of classes marked with InitializeOnLoad. But at this point I suspect that Unity has not yet identified assets you have within any Resources folders. When the class constructor calls the Resources.Load method it will fail to read the test.txt resource file and return a warning message out to the console.

What you could do at this point is right click the “Assets” folder in the project window and select “Reimport”. Unity will reimport the assets and again call classes marked with InitializeOnLoad. But this time Resources.load will successfully load the test.txt file resource and display it’s contents out to the Unity console window.

One work around to this is to hook into the EditorApplication.update callback and make a call to the LoadData method from there.  An example is provided below …

namespace CBX.CoreProjectCode
{
    using UnityEditor;

    using UnityEngine;

    [InitializeOnLoad]
    public class EditorInitialization
    {
        private static bool ranOnce;

        static EditorInitialization()
        {
            EditorApplication.update += RunCallbacks;
        }

        private static void RunCallbacks()
        {
            if (!ranOnce)
            {
                // this will see the test.txt file in the Resource folder and display
                // its contents
                LoadData();
                ranOnce = true;

                // return or don't it’s up to you
                return;
            }

            // do some work here
        }

        private static void LoadData()
        {
            var data = Resources.Load("test", typeof(TextAsset)) as TextAsset;
            if (data == null)
            {
                Debug.LogWarning("No data found");
                return;
            }

            Debug.Log(data.text);
        }
    }
}

Again I am unsure whether this is an actual bug or not but I have submitted a Unity bug report anyway just in case. Here is a link to the my bug report https://fogbugz.unity3d.com/default.asp?525005_eroka98ru2v4netm

/// <summary>
/// Blends two colors together.
/// </summary>
/// <param name="color">
/// The source color.
/// </param>
/// <param name="src">
/// The blend color.
/// </param>
/// <returns>
/// Returns the result as a <see cref="Color"/> type.
/// </returns>
/// <remarks>
/// From Wikipedia https://en.wikipedia.org/wiki/Alpha_compositing -> "Alpha blending" 
/// </remarks>
public static Color Blend(this Color color, Color src)
{
    float sr = src.R / 255f;
    float sg = src.G / 255f;
    float sb = src.B / 255f;
    float sa = src.A / 255f;
    float dr = color.R / 255f;
    float dg = color.G / 255f;
    float db = color.B / 255f;
    float da = color.A / 255f;

    float oa = sa + (da * (1 - sa));
    float r = ((sr * sa) + ((dr * da) * (1 - sa))) / oa;
    float g = ((sg * sa) + ((dg * da) * (1 - sa))) / oa;
    float b = ((sb * sa) + ((db * da) * (1 - sa))) / oa;
    float a = oa;

    return new Color((byte)(r * 255), (byte)(g * 255), (byte)(b * 255), (byte)(a * 255));
}

The code below allows you to scale a GameObject transform to a specific size along the x & z axis by taking into account the GameObjects renderer bounds if a renderer component is attached.

/// <summary>
/// Scales a transform to specific dimensions along the x & z axis.
/// </summary>
/// <param name="transform">
/// Reference to the transform to scale.
/// </param>
/// <param name="width">The width along the x axis that represents the target size.</param>
/// <param name="height">The height along the z axis that represents the target size.</param>
public static void ScaleTransform(Transform transform, float width, float height)
{
    // get bounds of the prefab
    var bounds = new Bounds();
    var encapsulate = false;
    if (!Utilities.Helpers.GetBoundWithChildren(transform, ref bounds, ref encapsulate))
    {
        return;
    }

    // get minimum size from the size dimensions
    var min = Mathf.Min(width, height);

    // get the maximum x or z size of the transform
    var max = Mathf.Max(bounds.size.x, bounds.size.z);

    // calculate the scale factor 
    var scaleFactor = min / max;

    // apply scaling to the transform
    transform.localScale *= scaleFactor;
}

/// <summary>
/// Gets the rendering bounds of the transform.
/// </summary>
/// <param name="transform">The game object to get the bounding box for.</param>
/// <param name="pBound">The bounding box reference that will </param>
/// <param name="encapsulate">Used to determine if the first bounding box to be 
/// calculated should be encapsulated into the <see cref="pBound"/> argument.</param>
/// <returns>Returns true if at least one bounding box was calculated.</returns>
public static bool GetBoundWithChildren(Transform transform, ref Bounds pBound, ref bool encapsulate)
{
    var didOne = false;

    // get 'this' bound
    if (transform.gameObject.renderer != null)
    {
        var bound = transform.gameObject.renderer.bounds;
        if (encapsulate)
        {
            pBound.Encapsulate(bound.min);
            pBound.Encapsulate(bound.max);
        }
        else
        {
            pBound.min = bound.min;
            pBound.max = bound.max;
            encapsulate = true;
        }

        didOne = true;
    }

    // union with bound(s) of any/all children
    foreach (Transform child in transform)
    {
        if (GetBoundWithChildren(child, ref pBound, ref encapsulate))
        {
            didOne = true;
        }
    }

    return didOne;
}

Using the Undo.IncrementCurrentEventIndex allows your editor scripts to undo a single action rather then have unity undo many actions that may have occurred in rapid succession. Place the code below into a “Editor” folder for it to run.

The “create object” button will create 10 cubes and call Undo.RegisterCreatedObjectUndo for each of them. Click this button then press ctrl+z to undo all of the objects that were created.

The second button “create single object” will also create 10 cubes but will also call the Undo.IncrementCurrentEventIndex method notifying unity that each object that is created should have a separate undo action. Click “create single object” to create 10 cubes then press ctrl+z to undo each object creation individually.

NOTE: At the time of this writing the unity documentation does not have information on the Undo.IncrementCurrentEventIndex method and searching for it also comes back with zero results.

    using UnityEngine;
    using UnityEditor;

    public class UndoTest : EditorWindow
    {

        public void OnGUI()
        {
            if (GUILayout.Button("create object"))
            {
                this.Create(false);
            }
            if (GUILayout.Button("create single object"))
            {
                this.Create(true);
            }

            GUILayout.Label("use ctrl+z to undo each action");
        }

        private void Create(bool single)
        {
            for (int i = 0; i < 10; i++)
            {
                if (single)
                {
                    Undo.IncrementCurrentEventIndex();
                }

                var obj = GameObject.CreatePrimitive(PrimitiveType.Cube);
                obj.transform.position = new Vector3(Random.Range(-10, 10), Random.Range(-10, 10), Random.Range(-10, 10));

                Undo.RegisterCreatedObjectUndo(obj, "create " + obj.name);
            }
        }

        [MenuItem("CBX/UndoTest")]
        public static void ShowWindow()
        {
            GetWindow<UndoTest>("UndoTest").Show();
        }
    }

/// <summary>
/// Packs color components into a <see cref="uint"/> type.
/// </summary>
/// <param name="r">The red component.</param>
/// <param name="g">The green component.</param>
/// <param name="b">The blue component.</param>
/// <param name="a">The alpha component.</param>
/// <returns>Returns a uint representing the color.</returns>
public static uint Pack(int r, int g, int b, int a)
{
    return (((uint)r & 0xff)) | (((uint)g & 0xff) << 8) | (((uint)b & 0xff) << 16) | (((uint)a & 0xff) << 24);
}

/// <summary>
/// Unpacks a <see cref="uint"/> type into a color type.
/// </summary>
/// <param name="value">The packed color value to unpack.</param>
/// <returns>Returns a color type from the unpacked values.</returns>
public static Color Unpack(uint value)
{
    var r = (byte)(value);
    var g = (byte)(value >> 8);
    var b = (byte)(value >> 16);
    var a = (byte)(value >> 24);

    return new Color(r, g, b, a);
}

Today I was writing some C# code where I needed to manage a multidimensional array. Specifically I needed to store a items using Column, Row, & Depth as indexers. Instead I wrote a Array3D class that used generics to store any type and internally it uses a single dimensional array and a little bit of math to select the right index.

Not long after I started writing it Déjà vu set in. You know I could have swore I’ve written this class some time ago. Searching through hundreds of projects and tens of thousands of files dating back to 2001 ala .NET 1.0 I came up with nothing. I even went a little nuts and searched back further into my old Turbo Pascal and QBasic code but still found nothing.

Google, DuckDuckGo, & Bing searches were no help either. I could not shake the feeling I have written or have come across this code before. Maybe not in C# but in some other language. I’m sure I have …

This is not the first time I have started to write code and had a strong sense that I have written this code before as I’m sure many programmers do. Maybe it’s just me but with all our modern fancy IDE’s and add-ons archiving code for long periods of time, as in decades, does not seem to be something that has been readily addressed. If there is one thing I absolutely hate is having to repeat my self to the computer when it comes to coding. it’s also why I have visual studio set to auto save every 60 seconds.

Also hard to believe .NET is pushing 12+ years already. Hard to believe that the so called high tech industry essentially has not changed at all since the early 1960’s. Yes, 1960’s & 70’s that’s the era when the first high level languages were originally developed. And here we are 50+ years later and were still just an endless sea of primates spanking our hands on the keyboard just hoping for the best. But that is a rant for another time. :P

So to try and address the issue of code loss I have decided to start a “Code Snippets” series to archive various code snippets in an effort to make searching for them a little bit easier.

If you are submitting packages to the asset store and are including version changes that contain html links, remember to specify target="_blank" in your link attributes. Failure to do so can result in the asset store window being replaced by the web page that your link was pointing to. In some occasions it can also cause unity to crash.

I have been thinking that because texture atlases are so common Unity should have some build in support for generating them. Turns out it already does! Check out the Texture2D.PackTextures method.