internal void OnColorPair(ColorPair newColorPair)
{
if (!countsOfSimilarPairs.ContainsKey(newColorPair))
{
countsOfSimilarPairs[newColorPair] = 1;
foreach (var colorPairEntry in countsOfSimilarPairs)
{
if (colorPairEntry.Key.IsVisiblySimilarTo(newColorPair))
{
countsOfSimilarPairs[newColorPair] = colorPairEntry.Value;
//All similar colors are kept in sync, so we only need ony match.
break;
}
}
}
var similarPairs = new List <ColorPair>(countsOfSimilarPairs.Keys.Where(x => x.IsVisiblySimilarTo(newColorPair)));
foreach (var colorPair in similarPairs)
{
countsOfSimilarPairs[colorPair] = countsOfSimilarPairs[colorPair] + 1;
}
if (!countsOfExactPairs.ContainsKey(newColorPair))
{
countsOfExactPairs[newColorPair] = 1;
}
else
{
countsOfExactPairs[newColorPair] = countsOfExactPairs[newColorPair] + 1;
}
}
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));
}
}
/**
* How confident we are that this result found the actual (or Visibly Similar)
* Text and Background color combination.
*
* Note: A value of HIGH can be depended on for a Rule.
*/
public Confidence ConfidenceValue()
{
if (countsOfSimilarPairs.Count == 0)
{
return(Confidence.Low);
}
var orderedByCountThenContrast = countsOfSimilarPairs
.OrderByDescending(x => x.Value)
.ThenByDescending(x => x.Key.ColorContrast());
int lastCount = 0;
ColorPair lastColorPair = null;
if (orderedByCountThenContrast.First().Value >= ColorContrastConfig.MinNumberColorTransitions)
{
foreach (var entry in orderedByCountThenContrast)
{
var colorPair = entry.Key;
if (lastColorPair != null)
{
if (lastColorPair.IsVisiblySimilarTo(colorPair))
{
continue;
}
else
{
if (lastCount > entry.Value * ColorContrastConfig.TextColorPairDominanceValue)
{
return(Confidence.High);
}
}
}
lastColorPair = entry.Key;
lastCount = entry.Value;
}
return(Confidence.Mid);
}
return(Confidence.Low);
}
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));
}
/**
* 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));
}