/**
* True when a pair of colors have visibly similar pairs of colors.
*/
public Boolean IsVisiblySimilarTo(ColorPair otherPair)
{
if (otherPair == null)
{
throw new ArgumentNullException(nameof(otherPair));
}
return(LighterColor.IsSimilarColor(otherPair.LighterColor) &&
DarkerColor.IsSimilarColor(otherPair.DarkerColor));
}
/// <summary>
/// Counts up the ForegroundColor from each entry in _rowResults, then
/// combines similar colors to allow for things like antialiasing.
/// Candidate colors are evaluated, beginning at the highest contrast
/// from backgroundColor, until we find a candidate that seems to occur
/// frequently enough that we accept it as the foreground color.
/// </summary>
private ColorVoteInfo GetForegroundInfo(Color backgroundColor)
{
CountMap <Color> simpleForegroundColorBallots = new CountMap <Color>();
_rowResults.ForEach(r =>
{
Color foregroundColor = r.ForegroundColor;
Color testBackgroundColor = r.BackgroundColor;
if (foregroundColor != null && backgroundColor.Equals(testBackgroundColor))
{
simpleForegroundColorBallots.Increment(r.ForegroundColor, r.TransitionCount);
}
});
if (!simpleForegroundColorBallots.Any())
{
return(null);
}
var simpleForegroundBallotsSortedByContrast = simpleForegroundColorBallots.OrderByDescending(x =>
{
ColorPair cp = new ColorPair(backgroundColor, x.Key);
return(cp.ColorContrast());
});
CountMap <Color> aggregatedForegroundColorBallots = new CountMap <Color>();
foreach (var pair in simpleForegroundBallotsSortedByContrast)
{
// Remember counts so we can add them after we iterate the entire list
CountMap <Color> rememberedCounts = new CountMap <Color>();
foreach (var aggregateForegroundColorBallot in aggregatedForegroundColorBallots)
{
if (aggregateForegroundColorBallot.Key.IsSimilarColor(pair.Key))
{
rememberedCounts
.Increment(aggregateForegroundColorBallot.Key, pair.Value);
}
}
foreach (var countToAdd in rememberedCounts)
{
aggregatedForegroundColorBallots
.Increment(countToAdd.Key, countToAdd.Value);
}
aggregatedForegroundColorBallots.Increment(pair.Key, pair.Value);
}
var sortedForegroundColorBallots = aggregatedForegroundColorBallots
.OrderByDescending(x => x.Value);
return(BuildColorVoteInfo(sortedForegroundColorBallots, GetTotalVoteCountFromAllBallots));
}
public override bool Equals(Object obj)
{
//Check for null and compare run-time types.
if ((obj == null) || !this.GetType().Equals(obj.GetType()))
{
return(false);
}
else
{
ColorPair p = (ColorPair)obj;
return(p.ToString().Equals(ToString(), StringComparison.Ordinal));
}
}
private Color FindForegroundColor(Color backgroundColor)
{
var contrastingColors = _countExactColors.OrderByDescending(x =>
{
ColorPair cp = new ColorPair(backgroundColor, x.Key);
return(cp.ColorContrast());
});
// Assume that the foreground color has the greatest contrast from the background
var mostContrastingColor = contrastingColors.First().Key;
var foregroundColor = mostContrastingColor.Equals(backgroundColor) ?
null : mostContrastingColor;
return(foregroundColor);
}
internal ColorContrastResult Add(ColorPair newColorPair)
{
var newTextColor = newColorPair.foregroundColor;
var newBackgroundColor = newColorPair.backgroundColor;
if (mostContrastingPair == null ||
mostContrastingPair.ColorContrast() < newColorPair.ColorContrast())
{
mostContrastingPair = newColorPair;
}
foreach (var alternativePair in alternatives)
{
if (!alternativePair.IsVisiblySimilarTo(newColorPair))
{
numDifferentBackgroundColors++;
numVisiblyDifferentTextColors++;
}
}
if (numDifferentBackgroundColors > 3 || numVisiblyDifferentTextColors > 3)
{
confidence = Confidence.Low;
}
else if (numDifferentBackgroundColors > 1 || numVisiblyDifferentTextColors > 1)
{
confidence = Confidence.Mid;
}
else
{
this.confidence = Confidence.High;
}
alternatives.Add(newColorPair);
return(this);
}
/**
* True when a pair of colors have visibly similar pairs of colors.
*/
public Boolean IsVisiblySimilarTo(ColorPair otherPair)
{
return(LighterColor.IsSimilarColor(otherPair.LighterColor) &&
DarkerColor.IsSimilarColor(otherPair.DarkerColor));
}