Captcha(bool createBuilder, Config config)
{
// the createBuilder is false when the object has been created from the builder
// and true when a public constructor is used instead
if (createBuilder)
{
if (config == null)
{
throw new ArgumentNullException("config", "Configuration object can't be null");
}
new Builder(this)
.Background(CreateDefaultBackground(config))
.Keygen(CreateDefaultKeygen(config))
.Drawer(CreateDefaultDrawer(config))
.Filters(CreateDefaultFilters(config))
.Build();
}
}
/// <summary>
/// Initializes a new instance using configuration.
/// </summary>
public Captcha(Config config)
: this(createBuilder: true, config: config)
{
}
static IKeygen CreateDefaultKeygen(Config config)
{
return new Keygen(NumberGenerator.Instance)
{
KeyLength = config.KeyLength,
Alphabet = config.BitmapFont.Alphabet
};
}
static IFilter[] CreateDefaultFilters(Config config)
{
if (config.WavesFilterEnabled)
{
var random = NumberGenerator.Instance;
// 0..2PI phase
var xWave = new WavesFilter.Wave(0.15f, 2, random.NextInt(0, 628) / 100f);
var bigYWave = new WavesFilter.Wave(0.040f, random.NextInt(6, 8), random.NextInt(0, 628) / 100f);
var smallYWave = new WavesFilter.Wave(0.1f, random.NextInt(2, 4), random.NextInt(0, 628) / 100f);
return new IFilter[]
{
new WavesFilter(
new WavesFilter.Wave[] { xWave },
new WavesFilter.Wave[] { bigYWave, smallYWave })
};
}
else
{
return new IFilter[0];
}
}
static IDrawer CreateDefaultDrawer(Config config)
{
return new Drawer(NumberGenerator.Instance)
{
Font = config.BitmapFont,
FontColor = config.ForegroundColor,
OverlayEnabled = config.OverlayEnabled,
OverlayPixels = 0
};
}
static Image CreateDefaultBackground(Config config)
{
var bg = new Bitmap(config.ImageWidth, config.ImageHeight);
using (Graphics graphics = Graphics.FromImage(bg))
using (SolidBrush brush = new SolidBrush(config.BackgroundColor))
{
graphics.FillRectangle(brush, 0, 0, config.ImageWidth, config.ImageHeight);
}
return bg;
}
public static Config Parse(object obj)
{
var config = new Config();
if (obj == null)
{
throw new ArgumentNullException("obj", "Can't parse null object");
}
PropertyInfo[] props = obj.GetType().GetProperties();
foreach (PropertyInfo prop in props)
{
object val = prop.GetValue(obj, null);
string type = prop.PropertyType.FullName;
string name = prop.Name.ToLower();
switch (name)
{
case "keylength":
config.keyLength = ParseInt(name, type, val);
break;
case "width":
config.imageWidth = ParseInt(name, type, val);
break;
case "height":
config.imageHeight = ParseInt(name, type, val);
break;
case "foreground":
config.foregroundColor = ParseColor(name, type, val);
break;
case "background":
config.backgroundColor = ParseColor(name, type, val);
break;
case "overlay":
config.overlayEnabled = ParseBool(name, type, val);
break;
case "waves":
config.wavesFilterEnabled = ParseBool(name, type, val);
break;
case "font":
config.fontPath = ParseString(name, type, val);
break;
}
}
config.InitValues();
return config;
}
