public double GetRelativeError(List <Color> colors, List <double> accumulatedDistances)
{
GradientEyedropper.GradientInterval gradientInterval = this.Prev;
if (gradientInterval == null)
{
return(double.MaxValue);
}
bool flag1 = this.R == colors.Count;
bool flag2 = gradientInterval.L == -1;
double num1 = accumulatedDistances[flag1 ? colors.Count - 1 : this.R];
double num2 = accumulatedDistances[flag2 ? 0 : gradientInterval.L];
Vector3D vector3D1 = GradientEyedropper.Subtract(colors[flag2 ? this.L : gradientInterval.L], colors[this.L]);
double x1 = accumulatedDistances[this.L] - num2;
Vector3D vector3D2 = GradientEyedropper.Subtract(colors[this.L], colors[flag1 ? this.L : this.R]);
double x2 = num1 - accumulatedDistances[this.L];
if (flag2)
{
return(Math.Max(2.0 * x1 * Math.Abs(vector3D2.X) + Math.Abs(Vector.CrossProduct(new Vector(0.0, vector3D2.X), new Vector(x2, vector3D2.X))), Math.Max(2.0 * x1 * Math.Abs(vector3D2.Y) + Math.Abs(Vector.CrossProduct(new Vector(0.0, vector3D2.Y), new Vector(x2, vector3D2.Y))), 2.0 * x1 * Math.Abs(vector3D2.Z) + Math.Abs(Vector.CrossProduct(new Vector(0.0, vector3D2.Z), new Vector(x2, vector3D2.Z))))));
}
if (flag1)
{
return(Math.Max(2.0 * x2 * Math.Abs(vector3D1.X) + Math.Abs(Vector.CrossProduct(new Vector(0.0, vector3D1.X), new Vector(x1, vector3D1.X))), Math.Max(2.0 * x2 * Math.Abs(vector3D1.Y) + Math.Abs(Vector.CrossProduct(new Vector(0.0, vector3D1.Y), new Vector(x1, vector3D1.Y))), 2.0 * x2 * Math.Abs(vector3D1.Z) + Math.Abs(Vector.CrossProduct(new Vector(0.0, vector3D1.Z), new Vector(x1, vector3D1.Z))))));
}
return(Math.Max(Math.Abs(Vector.CrossProduct(new Vector(-x1, -vector3D1.X), new Vector(x2, vector3D2.X))), Math.Max(Math.Abs(Vector.CrossProduct(new Vector(-x1, -vector3D1.Y), new Vector(x2, vector3D2.Y))), Math.Abs(Vector.CrossProduct(new Vector(-x1, -vector3D1.Z), new Vector(x2, vector3D2.Z))))));
}
private ICollection <GradientEyedropper.GradientInterval> GenerateMinimalIntervalSet(List <Color> colors, List <double> accumulatedDistances)
{
SortedDictionary <GradientEyedropper.GradientInterval, bool> intervals = new SortedDictionary <GradientEyedropper.GradientInterval, bool>((IComparer <GradientEyedropper.GradientInterval>) new GradientEyedropper.IntervalComparer(colors, accumulatedDistances));
GradientEyedropper.GradientInterval gradientInterval = (GradientEyedropper.GradientInterval)null;
for (int l = -1; l < colors.Count; ++l)
{
GradientEyedropper.GradientInterval key = new GradientEyedropper.GradientInterval(l, l + 1);
if (gradientInterval != null)
{
key.Prev = gradientInterval;
gradientInterval.Next = key;
}
intervals.Add(key, true);
gradientInterval = key;
}
while (intervals.Count > 2)
{
GradientEyedropper.GradientInterval best = this.FindBest(intervals, colors, accumulatedDistances);
if (best != null)
{
intervals.Remove(best);
GradientEyedropper.GradientInterval key1 = best.Prev;
intervals.Remove(key1);
GradientEyedropper.GradientInterval key2 = best.Next;
if (key2 != null)
{
intervals.Remove(key2);
}
GradientEyedropper.GradientInterval key3 = new GradientEyedropper.GradientInterval(key1.L, best.R);
if (key1.Prev != null)
{
key3.Prev = key1.Prev;
key1.Prev.Next = key3;
}
if (best.Next != null)
{
key3.Next = best.Next;
best.Next.Prev = key3;
intervals.Add(key2, true);
}
intervals.Add(key3, true);
}
else
{
break;
}
}
return((ICollection <GradientEyedropper.GradientInterval>)intervals.Keys);
}
public double GetAbsoluteError(List <Color> colors, List <double> accumulatedDistances)
{
GradientEyedropper.GradientInterval gradientInterval = this.Prev;
double num1 = 0.0;
bool flag1 = this.R == colors.Count;
bool flag2 = gradientInterval.L == -1;
Color a1 = colors[flag2 ? this.R : gradientInterval.L];
Color b = colors[flag1 ? gradientInterval.L : this.R];
double num2 = accumulatedDistances[flag1 ? colors.Count - 1 : this.R];
double num3 = accumulatedDistances[flag2 ? 0 : gradientInterval.L];
double num4 = num2 - num3;
Vector3D vector3D1 = GradientEyedropper.Subtract(a1, b);
for (int index = gradientInterval.L + 1; index < this.R; ++index)
{
Vector3D vector3D2 = vector3D1 * ((accumulatedDistances[index] - num3) / num4);
Color a2 = Color.FromArgb(byte.MaxValue, (byte)((double)a1.R + vector3D2.X), (byte)((double)a1.G + vector3D2.Y), (byte)((double)a1.B + vector3D2.Z));
num1 = Math.Max(num1, GradientEyedropper.Subtract(a2, colors[index]).LengthSquared);
}
return(Math.Sqrt(num1));
}
private LinearGradientBrush ReconstructGradient(List <Color> colors, List <double> accumulatedDistances, ICollection <GradientEyedropper.GradientInterval> intervals)
{
LinearGradientBrush brush = new LinearGradientBrush();
GradientEyedropper.GradientInterval gradientInterval = (GradientEyedropper.GradientInterval)null;
using (IEnumerator <GradientEyedropper.GradientInterval> enumerator = intervals.GetEnumerator())
{
if (enumerator.MoveNext())
{
gradientInterval = enumerator.Current;
}
}
while (gradientInterval.Prev != null)
{
gradientInterval = gradientInterval.Prev;
}
if (intervals.Count == 2)
{
this.AddGradientStop(brush, colors, 0, accumulatedDistances);
if (gradientInterval.R != 0 && gradientInterval.R != colors.Count - 1)
{
this.AddGradientStop(brush, colors, gradientInterval.R, accumulatedDistances);
}
this.AddGradientStop(brush, colors, colors.Count - 1, accumulatedDistances);
}
else
{
for (; gradientInterval != null; gradientInterval = gradientInterval.Next)
{
if (gradientInterval.L >= 0)
{
this.AddGradientStop(brush, colors, gradientInterval.L, accumulatedDistances);
}
}
}
return(brush);
}
