Tasharen Entertainment Forum

Support => NGUI 3 Support => Topic started by: Ivan on February 06, 2017, 10:30:00 AM

Title: Find Bug in UI Widget code
Post by: Ivan on February 06, 2017, 10:30:00 AM
Find little but maybe imortant bug.

public Color color
   {
      get
      {
         return mColor;
      }
      set
      {
         if (mColor.a != value)
                        {
            bool alphaChange = Mathf.Abs(mColor.a - value.a)> Mathf.Epsilon;
            mColor = value;
            Invalidate(alphaChange);
         }
      }
   }

if (mColor.a != value) is always return true if using tween even if it change color from white to white. U cant use "==" to colors which are taken from different behaviours becuse its different structures.

thats my fix

public Color color
   {
      get
      {
         return mColor;
      }
      set
      {
         if (Mathf.Abs(mColor.a - value.a) > 0.005f || Mathf.Abs(mColor.r - value.r) > 0.005f || Mathf.Abs(mColor.b - value.b) > 0.005f || Mathf.Abs(mColor.g - value.g) > 0.005f)
            {
            bool alphaChange = Mathf.Abs(mColor.a - value.a)> Mathf.Epsilon;
            mColor = value;
            Invalidate(alphaChange);
         }
      }
   }
Title: Re: Find Bug in UI Widget code
Post by: ArenMook on February 08, 2017, 08:36:15 AM
Why would it be mColor.a != value? That's not even compile-able. I assume you mean mColor != value, which is what it is in NGUI.

  1.         public Color color
  2.         {
  3.                 get
  4.                 {
  5.                         return mColor;
  6.                 }
  7.                 set
  8.                 {
  9.                         if (mColor != value) // <-----
  10.                         {
  11.                                 bool alphaChange = (mColor.a != value.a);
  12.                                 mColor = value;
  13.                                 Invalidate(alphaChange);
  14.                         }
  15.                 }
  16.         }

The inequality is completely intentional the way it is (mColor != value). Even slightest inequality is still an inequality. Colors are floating point based in the shader. They are not byte-based.
Title: Re: Find Bug in UI Widget code
Post by: Ivan on February 08, 2017, 11:03:37 AM
Sorry, I certainly meant
  1. (mColor != value)
I have buttons without hover state (I just made it's normal and hover colors white), but when I move mouse over button its make button mark as changed. I think that's wrong.
So it seems to me wrong to compare floats that are in different structures.
Title: Re: Find Bug in UI Widget code
Post by: ArenMook on February 13, 2017, 11:14:36 AM
No, it's not wrong. When you compare a color, it has to compare each float individually, and if floats differ even slightly then they are different values. Identical colors will always match.

For example:
  1. var c0 = new Color(0.5f, 0.25f, 0.35f);
  2. var c1 = new Color(0.5f, 0.25f, 0.35f);
  3. Debug.Log(c0 == c1);
You will see 'true'.
Title: Re: Find Bug in UI Widget code
Post by: Ivan on February 14, 2017, 08:42:08 AM
My Visual Studio apparently decided to make a joke on me. This is what I see in debug mode (https://pp.vk.me/c636327/v636327353/5354a/CWahkdakYfQ.jpg) (https://pp.vk.me/c636327/v636327353/5354a/CWahkdakYfQ.jpg), and i decided that this is floating point inaccuracy.  But when i deside to look at additional info i found this. (https://pp.vk.me/c636327/v636327353/53551/ifstpCOWNA4.jpg). This is not floating point inaccuracy, this is 1 / 255. Sorry I go to kill my UI designer. He made all buttons hover state color (255,254,254,255).