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public static Color GetBlendedColor(PaintLayer layer, Color rgbColor, float pressurePercent, ushort tileX, ushort tileY,
out Color?oldColor)
{
Color blendedColor;
float oldPressurePercent;
oldColor = layer.GetRawColorAt(tileX, tileY);
if (oldColor != null)
{
Color oldRgbColor = (Color)oldColor;
oldPressurePercent = oldRgbColor.A / 255f;
float oldPressurePercentOffset = (1f - pressurePercent) * oldPressurePercent;
blendedColor = Color.Lerp(rgbColor, oldRgbColor, oldPressurePercentOffset);
}
else
{
oldPressurePercent = 0f;
blendedColor = rgbColor;
}
blendedColor.A = (byte)(MathHelper.Lerp(oldPressurePercent, 1f, pressurePercent) * 255f);
return(blendedColor);
}
public static Color GetErasedColor(PaintLayer layer, float pressurePercent, ushort tileX, ushort tileY, out Color?oldColor)
{
oldColor = layer.GetRawColorAt(tileX, tileY);
if (oldColor == null)
{
return(Color.Transparent);
}
Color blendedColor = (Color)oldColor;
blendedColor.A = (byte)(MathHelper.Lerp(blendedColor.A, 0f, pressurePercent) * 255f);
return(blendedColor);
}