/// <summary>
///
/// </summary>
/// <param name="bitmap"></param>
/// <param name="distanceMap"></param>
/// <param name="glowDistance"></param>
/// <param name="glowColor"></param>
/// <param name="function"></param>
public static void DrawGlow(Bitmap bitmap, DistanceEntry[,] distanceMap, float glowDistance,
ArgbRev glowColor, Func <float, float> function = null)
{
var transparentColor = (ArgbRev)"#00000000";
if (function == null)
{
function = v => v;
}
bitmap.Shader((color, x, y) =>
{
var dist = (float)distanceMap[x, y].Distance;
// ReSharper disable once CompareOfFloatsByEqualityOperator
if (dist == 0f && color.A == 0xFF)
{
return(color);
}
if (dist > glowDistance)
{
return(new ArgbRev(0, 0, 0, 0));
}
var genColor = ArgbRev.Interpolate(glowColor, transparentColor, 1 - function(dist / glowDistance));
// ReSharper disable once CompareOfFloatsByEqualityOperator
return(dist == 0 ? ArgbRev.Mix(color, genColor) : genColor);
});
}
/// <summary>
///
/// </summary>
/// <param name="bitmap"></param>
/// <param name="distanceMap"></param>
/// <param name="glowDistance"></param>
/// <param name="glowColor"></param>
/// <param name="min"></param>
/// <param name="max"></param>
public static void DrawGlow(Bitmap bitmap, DistanceEntry[,] distanceMap, float glowDistance,
ArgbRev glowColor, float min, float max = 1.0f)
{
DrawGlow(bitmap, distanceMap, glowDistance, glowColor,
f => MathUtils.SmoothStep(min, max, f));
}
