public virtual void TryGetNearlyPreferredPosition(int distance)
{
Check();
Point spriteSize = SpriteColorSize;
HashSet <Point> points = new HashSet <Point>();
foreach (WeightedPoint weightedPoint in PreferredPosition)
{
foreach (Point point in ShiftPosition.EnumItNearly(EffectSpriteColorSize, spriteSize, weightedPoint.Position, distance))
{
points.Add(point);
}
}
PreferredPosition.Clear();
EffectiveArea = GetEffectiveArea();
Value[,] valueMap = new Value[spriteSize.X, spriteSize.Y];
foreach (Point point in points)
{
foreach (Point selectPoint in EffectiveArea)
{
JPColor effectColor = EffectSpriteColor[point.X + selectPoint.X, point.Y + selectPoint.Y];
JPColor spriteColor = SpriteColor[selectPoint.X, selectPoint.Y];
valueMap[selectPoint.X, selectPoint.Y] = GetDeltaValue(effectColor, spriteColor);
}
if (ValueMapIsBetter(valueMap, out float averageValue))
{
PreferredPosition.Add(new WeightedPoint(point, averageValue));
}
}
}
protected virtual Point[] GetEffectiveArea()
{
List <Point> result = new List <Point>();
IEnumerable <Point> enumPoints;
int count = EffectSpriteColor.Length;
if (count < ZipCount)
{
enumPoints = ShiftPosition.EnumIt(SpriteColorSize, Point.One, ShiftPositionPropensity.LineByLine);
}
else if (count < ZipCount * 3)
{
enumPoints = ShiftPosition.EnumIt(SpriteColorSize, Point.One, ShiftPositionPropensity.Random512);
}
else if (count < ZipCount * 6)
{
enumPoints = ShiftPosition.EnumIt(SpriteColorSize, Point.One, ShiftPositionPropensity.Interval2);
}
else
{
enumPoints = ShiftPosition.EnumIt(SpriteColorSize, Point.One, ShiftPositionPropensity.Interval3);
}
foreach (Point enumPoint in enumPoints)
{
JPColor enumPointColor = SpriteColor[enumPoint.X, enumPoint.Y];
if (enumPointColor.A > 0.25)
{
result.Add(enumPoint);
}
}
return(result.ToArray());
}
protected virtual IEnumerable <Point> GetShiftPosition() => ShiftPosition.EnumIt(EffectSpriteColorSize, SpriteColorSize, Propensity);
