public int GetIndex(UInt32 input)
{
int i = 0;
int minDelta = int.MaxValue;
int index = 0;
foreach (UInt32 color in palette)
{
int deltaR = Math.Abs(Color32Util.GetR(color) - Color32Util.GetR(input));
int deltaG = Math.Abs(Color32Util.GetG(color) - Color32Util.GetG(input));
int deltaB = Math.Abs(Color32Util.GetB(color) - Color32Util.GetB(input));
int delta = deltaR + deltaG + deltaB;
if (delta < minDelta)
{
minDelta = delta;
index = i;
}
i++;
}
return(index);
}
public void RecalcCentroid()
{
centroid = Vector3.zero;
foreach (UInt32 color in colors)
{
centroid.x += Color32Util.GetR(color);
centroid.y += Color32Util.GetG(color);
centroid.z += Color32Util.GetB(color);
}
centroid.x = centroid.x / (float)colors.Count;
centroid.y = centroid.y / (float)colors.Count;
centroid.z = centroid.z / (float)colors.Count;
}
public static float ColorDistance(UInt32 a, UInt32 b)
{
Vector3 e1 = new Vector3(Color32Util.GetR(a), Color32Util.GetG(a), Color32Util.GetB(a));
Vector3 e2 = new Vector3(Color32Util.GetR(b), Color32Util.GetG(b), Color32Util.GetB(b));
Vector3 rel = e2 - e1;
Vector3 d1 = new Vector3(2, 3, 4) - e1;
Vector3 d2 = new Vector3(2, 3, 4) - e2;
d1.Normalize();
d2.Normalize();
double ang = 2.0 - Math.Abs(Vector3.Dot(d1, d2));
double length = rel.magnitude;
return((float)(length * ang));
}
public int MiddleDelta(UInt32 color)
{
int count = _colors.Count;
if (count == 0)
{
return(int.MaxValue);
}
UInt32 middleColor = _colors[count / 2];
int deltaR = Math.Abs(Color32Util.GetR(color) - Color32Util.GetR(middleColor));
int deltaG = Math.Abs(Color32Util.GetG(color) - Color32Util.GetG(middleColor));
int deltaB = Math.Abs(Color32Util.GetB(color) - Color32Util.GetB(middleColor));
return(deltaR + deltaG + deltaB);
}
public void SortColors(Color32 range)
{
byte channel = BiggestChannel(range);
if (range.r == channel)
{
_colors.Sort((a, b) => Color32Util.GetR(a).CompareTo(Color32Util.GetR(b)));
}
else if (range.g == channel)
{
_colors.Sort((a, b) => Color32Util.GetG(a).CompareTo(Color32Util.GetG(b)));
}
else
{
_colors.Sort((a, b) => Color32Util.GetB(a).CompareTo(Color32Util.GetB(b)));
}
}
private Texture2D CreatePaletteTexture(List <UInt32> colors, int shades)
{
Texture2D palette = new Texture2D(colors.Count, shades);
palette.filterMode = FilterMode.Point;
palette.wrapMode = TextureWrapMode.Clamp;
Color32[] data = palette.GetPixels32();
for (int x = 0; x < palette.width; x++)
{
for (int y = 0; y < palette.height; y++)
{
data[y * palette.width + x] = Color32Util.FromRGBAUint32(colors[x]);
}
}
palette.SetPixels32(data);
palette.Apply();
return(palette);
}
public void CalcRange(out Color32 range, out Color32 min, out Color32 max)
{
min = new Color32(byte.MaxValue, byte.MaxValue, byte.MaxValue, byte.MaxValue);
max = new Color32(byte.MinValue, byte.MinValue, byte.MinValue, byte.MinValue);
foreach (UInt32 c in colors)
{
Color32 color = Color32Util.FromRGBAUint32(c);
min.r = Math.Min(color.r, min.r);
min.g = Math.Min(color.g, min.g);
min.b = Math.Min(color.b, min.b);
max.r = Math.Max(color.r, max.r);
max.g = Math.Max(color.g, max.g);
max.b = Math.Max(color.b, max.b);
}
range = new Color32((byte)(max.r - min.r),
(byte)(max.g - min.g),
(byte)(max.b - min.b),
0);
}
private Dictionary <UInt32, UInt32> GetHistogram(Color32[] data)
{
Dictionary <UInt32, UInt32> histogram = new Dictionary <UInt32, UInt32>();
int i;
UInt32 color;
for (i = 0; i < data.Length; i++)
{
color = data[i].ToRGBAUInt32();
if (histogram.ContainsKey(color))
{
histogram[color]++;
}
else
{
histogram[color] = 0;
}
if (i % ProgressUpdateFreq == 0)
{
if (EditorUtility.DisplayCancelableProgressBar("Converting",
"Calculating unique colors",
(float)i / (float)data.Length))
{
EditorUtility.ClearProgressBar();
return(null);
}
}
}
int count = histogram.Count;
UInt32[] colors = new UInt32[count];
int[] hues = new int[count];
int[] sats = new int[count];
int[] vals = new int[count];
i = 0;
foreach (KeyValuePair <UInt32, UInt32> kv in histogram)
{
float h, s, v;
Color.RGBToHSV(Color32Util.FromRGBAUint32(kv.Key),
out h, out s, out v);
colors[i] = kv.Key;
hues[i] = (int)(h * 255.0f);
sats[i] = (int)(s * 255.0f);
vals[i] = (int)(v * 255.0f);
i++;
}
for (i = 0; i < count; i++)
{
int hueDelta = 0;
int satDelta = 0;
int valDelta = 0;
color = colors[i];
int hue = hues[i];
int sat = sats[i];
int val = vals[i];
for (int j = 0; j < count; j++)
{
hueDelta += Math.Abs(hues[j] - hue);
satDelta += Math.Abs(sats[j] - sat);
valDelta += Math.Abs(vals[j] - val);
}
histogram[color] = (UInt32)(hueDelta + valDelta + satDelta);
}
return(histogram);
}