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);