public static Color GetRelativeColor(this GradientStopCollection gsc, double offset)
{
var before = gsc.First(w => w.Offset == gsc.Min(m => m.Offset));
var after = gsc.First(w => w.Offset == gsc.Max(m => m.Offset));
foreach (var gs in gsc)
{
if (gs.Offset < offset && gs.Offset > before.Offset)
{
before = gs;
}
if (gs.Offset > offset && gs.Offset < after.Offset)
{
after = gs;
}
}
var color = new Color();
color.ScA = (float)((offset - before.Offset) * (after.Color.ScA - before.Color.ScA) / (after.Offset - before.Offset) + before.Color.ScA);
color.ScR = (float)((offset - before.Offset) * (after.Color.ScR - before.Color.ScR) / (after.Offset - before.Offset) + before.Color.ScR);
color.ScG = (float)((offset - before.Offset) * (after.Color.ScG - before.Color.ScG) / (after.Offset - before.Offset) + before.Color.ScG);
color.ScB = (float)((offset - before.Offset) * (after.Color.ScB - before.Color.ScB) / (after.Offset - before.Offset) + before.Color.ScB);
return(color);
}
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
double percentage = (double)value;
GradientStop start = GradientStops.First();
GradientStop stop = GradientStops.Last();
foreach (GradientStop gradientStop in GradientStops)
{
if (start.Offset < gradientStop.Offset && gradientStop.Offset < percentage)
{
start = gradientStop;
}
if (percentage < gradientStop.Offset && gradientStop.Offset < stop.Offset)
{
stop = gradientStop;
}
}
return(new SolidColorBrush(Color.FromScRgb((float)((percentage - stop.Offset) * (start.Color.ScA - stop.Color.ScA) / (start.Offset - stop.Offset) + stop.Color.ScA),
(float)((percentage - stop.Offset) * (start.Color.ScR - stop.Color.ScR) / (start.Offset - stop.Offset) + stop.Color.ScR),
(float)((percentage - stop.Offset) * (start.Color.ScG - stop.Color.ScG) / (start.Offset - stop.Offset) + stop.Color.ScG),
(float)((percentage - stop.Offset) * (start.Color.ScB - stop.Color.ScB) / (start.Offset - stop.Offset) + stop.Color.ScB))));
}
/// <summary>
/// Gets the color of the relative.
/// </summary>
/// <param name="gsc">
/// The GSC.
/// </param>
/// <param name="offset">
/// The offset.
/// </param>
/// <returns>
/// The <see cref="Color"/>.
/// </returns>
public static Color GetRelativeColor(this GradientStopCollection gsc, double offset)
{
GradientStop before = gsc.First(w => w.Offset == gsc.Min(m => m.Offset));
GradientStop after = gsc.First(w => w.Offset == gsc.Max(m => m.Offset));
foreach (GradientStop gs in gsc)
{
if (gs.Offset < offset && gs.Offset > before.Offset)
{
before = gs;
}
if (gs.Offset > offset && gs.Offset < after.Offset)
{
after = gs;
}
}
var a =
(float)
((offset - before.Offset) * (after.Color.ScA - before.Color.ScA) / (after.Offset - before.Offset)
+ before.Color.ScA);
var r =
(float)
((offset - before.Offset) * (after.Color.ScR - before.Color.ScR) / (after.Offset - before.Offset)
+ before.Color.ScR);
var g =
(float)
((offset - before.Offset) * (after.Color.ScG - before.Color.ScG) / (after.Offset - before.Offset)
+ before.Color.ScG);
var b =
(float)
((offset - before.Offset) * (after.Color.ScB - before.Color.ScB) / (after.Offset - before.Offset)
+ before.Color.ScB);
Color color = Color.FromArgb((int)(a * 255), (int)(r * 255), (int)(g * 255), (int)(b * 255));
return(color);
}
public LuaColor GetRelativeColor(Dictionary <LuaColor, double> gradientColors, double offset)
{
if (offset < 0)
{
offset = 0;
}
if (offset > 1)
{
offset = 1;
}
var gsc = new GradientStopCollection(gradientColors.Select(gc => new GradientStop(gc.Key.Color, gc.Value)));
var b = gsc.First(w => Math.Abs(w.Offset - gsc.Min(m => m.Offset)) < 0.01);
var a = gsc.First(w => Math.Abs(w.Offset - gsc.Max(m => m.Offset)) < 0.01);
foreach (var gs in gsc)
{
if (gs.Offset < offset && gs.Offset > b.Offset)
{
b = gs;
}
if (gs.Offset > offset && gs.Offset < a.Offset)
{
a = gs;
}
}
var color = new Color
{
ScA = (float)((offset - b.Offset) * (a.Color.ScA - b.Color.ScA) / (a.Offset - b.Offset) + b.Color.ScA),
ScR = (float)((offset - b.Offset) * (a.Color.ScR - b.Color.ScR) / (a.Offset - b.Offset) + b.Color.ScR),
ScG = (float)((offset - b.Offset) * (a.Color.ScG - b.Color.ScG) / (a.Offset - b.Offset) + b.Color.ScG),
ScB = (float)((offset - b.Offset) * (a.Color.ScB - b.Color.ScB) / (a.Offset - b.Offset) + b.Color.ScB)
};
return(new LuaColor(color));
}
