/// <summary>
/// Convert from HSL to RGB color space.
/// </summary>
///
/// <param name="hsl">Source color in <b>HSL</b> color space.</param>
/// <param name="rgb">Destination color in <b>RGB</b> color space.</param>
///
public static void ToRGB(HSL hsl, RGB rgb)
{
if (hsl.Saturation == 0)
{
// gray values
rgb.Red = rgb.Green = rgb.Blue = (byte)(hsl.Luminance * 255);
}
else
{
float v1, v2;
float hue = (float)hsl.Hue / 360;
v2 = (hsl.Luminance < 0.5) ?
(hsl.Luminance * (1 + hsl.Saturation)) :
((hsl.Luminance + hsl.Saturation) - (hsl.Luminance * hsl.Saturation));
v1 = 2 * hsl.Luminance - v2;
rgb.Red = (byte)(255 * Hue_2_RGB(v1, v2, hue + (1.0f / 3)));
rgb.Green = (byte)(255 * Hue_2_RGB(v1, v2, hue));
rgb.Blue = (byte)(255 * Hue_2_RGB(v1, v2, hue - (1.0f / 3)));
}
rgb.Alpha = 255;
}
// Gather statistics for the specified image
private unsafe void ProcessImage( UnmanagedImage image, byte* mask, int maskLineSize )
{
// get image dimension
int width = image.Width;
int height = image.Height;
pixels = pixelsWithoutBlack = 0;
int[] s = new int[256];
int[] l = new int[256];
int[] swb = new int[256];
int[] lwb = new int[256];
RGB rgb = new RGB( );
HSL hsl = new HSL( );
int pixelSize = ( image.PixelFormat == PixelFormat.Format24bppRgb ) ? 3 : 4;
int offset = image.Stride - width * pixelSize;
int maskOffset = maskLineSize - width;
// do the job
byte * p = (byte*) image.ImageData.ToPointer( );
if ( mask == null )
{
// for each line
for ( int y = 0; y < height; y++ )
{
// for each pixel
for ( int x = 0; x < width; x++, p += pixelSize )
{
rgb.Red = p[RGB.R];
rgb.Green = p[RGB.G];
rgb.Blue = p[RGB.B];
// convert to HSL color space
BestCS.Imaging.HSL.FromRGB( rgb, hsl );
s[(int) ( hsl.Saturation * 255 )]++;
l[(int) ( hsl.Luminance * 255 )]++;
pixels++;
if ( hsl.Luminance != 0.0 )
{
swb[(int) ( hsl.Saturation * 255 )]++;
lwb[(int) ( hsl.Luminance * 255 )]++;
pixelsWithoutBlack++;
}
}
p += offset;
}
}
else
{
// for each line
for ( int y = 0; y < height; y++ )
{
// for each pixel
for ( int x = 0; x < width; x++, p += pixelSize, mask++ )
{
if ( *mask == 0 )
continue;
rgb.Red = p[RGB.R];
rgb.Green = p[RGB.G];
rgb.Blue = p[RGB.B];
// convert to HSL color space
BestCS.Imaging.HSL.FromRGB( rgb, hsl );
s[(int) ( hsl.Saturation * 255 )]++;
l[(int) ( hsl.Luminance * 255 )]++;
pixels++;
if ( hsl.Luminance != 0.0 )
{
swb[(int) ( hsl.Saturation * 255 )]++;
lwb[(int) ( hsl.Luminance * 255 )]++;
pixelsWithoutBlack++;
}
}
p += offset;
mask += maskOffset;
}
}
// create histograms
saturation = new ContinuousHistogram( s, new Range( 0, 1 ) );
luminance = new ContinuousHistogram( l, new Range( 0, 1 ) );
saturationWithoutBlack = new ContinuousHistogram( swb, new Range( 0, 1 ) );
luminanceWithoutBlack = new ContinuousHistogram( lwb, new Range( 0, 1 ) );
}
// Gather statistics for the specified image
private unsafe void ProcessImage(UnmanagedImage image, byte *mask, int maskLineSize)
{
// get image dimension
int width = image.Width;
int height = image.Height;
pixels = pixelsWithoutBlack = 0;
int[] s = new int[256];
int[] l = new int[256];
int[] swb = new int[256];
int[] lwb = new int[256];
RGB rgb = new RGB( );
HSL hsl = new HSL( );
int pixelSize = (image.PixelFormat == PixelFormat.Format24bppRgb) ? 3 : 4;
int offset = image.Stride - width * pixelSize;
int maskOffset = maskLineSize - width;
// do the job
byte *p = (byte *)image.ImageData.ToPointer( );
if (mask == null)
{
// for each line
for (int y = 0; y < height; y++)
{
// for each pixel
for (int x = 0; x < width; x++, p += pixelSize)
{
rgb.Red = p[RGB.R];
rgb.Green = p[RGB.G];
rgb.Blue = p[RGB.B];
// convert to HSL color space
BestCS.Imaging.HSL.FromRGB(rgb, hsl);
s[(int)(hsl.Saturation * 255)]++;
l[(int)(hsl.Luminance * 255)]++;
pixels++;
if (hsl.Luminance != 0.0)
{
swb[(int)(hsl.Saturation * 255)]++;
lwb[(int)(hsl.Luminance * 255)]++;
pixelsWithoutBlack++;
}
}
p += offset;
}
}
else
{
// for each line
for (int y = 0; y < height; y++)
{
// for each pixel
for (int x = 0; x < width; x++, p += pixelSize, mask++)
{
if (*mask == 0)
{
continue;
}
rgb.Red = p[RGB.R];
rgb.Green = p[RGB.G];
rgb.Blue = p[RGB.B];
// convert to HSL color space
BestCS.Imaging.HSL.FromRGB(rgb, hsl);
s[(int)(hsl.Saturation * 255)]++;
l[(int)(hsl.Luminance * 255)]++;
pixels++;
if (hsl.Luminance != 0.0)
{
swb[(int)(hsl.Saturation * 255)]++;
lwb[(int)(hsl.Luminance * 255)]++;
pixelsWithoutBlack++;
}
}
p += offset;
mask += maskOffset;
}
}
// create histograms
saturation = new ContinuousHistogram(s, new Range(0, 1));
luminance = new ContinuousHistogram(l, new Range(0, 1));
saturationWithoutBlack = new ContinuousHistogram(swb, new Range(0, 1));
luminanceWithoutBlack = new ContinuousHistogram(lwb, new Range(0, 1));
}
/// <summary>
/// Convert from HSL to RGB color space.
/// </summary>
///
/// <param name="hsl">Source color in <b>HSL</b> color space.</param>
/// <param name="rgb">Destination color in <b>RGB</b> color space.</param>
///
public static void ToRGB( HSL hsl, RGB rgb )
{
if ( hsl.Saturation == 0 )
{
// gray values
rgb.Red = rgb.Green = rgb.Blue = (byte) ( hsl.Luminance * 255 );
}
else
{
float v1, v2;
float hue = (float) hsl.Hue / 360;
v2 = ( hsl.Luminance < 0.5 ) ?
( hsl.Luminance * ( 1 + hsl.Saturation ) ) :
( ( hsl.Luminance + hsl.Saturation ) - ( hsl.Luminance * hsl.Saturation ) );
v1 = 2 * hsl.Luminance - v2;
rgb.Red = (byte) ( 255 * Hue_2_RGB( v1, v2, hue + ( 1.0f / 3 ) ) );
rgb.Green = (byte) ( 255 * Hue_2_RGB( v1, v2, hue ) );
rgb.Blue = (byte) ( 255 * Hue_2_RGB( v1, v2, hue - ( 1.0f / 3 ) ) );
}
rgb.Alpha = 255;
}
/// <summary>
/// Convert from RGB to HSL color space.
/// </summary>
///
/// <param name="rgb">Source color in <b>RGB</b> color space.</param>
///
/// <returns>Returns <see cref="HSL"/> instance, which represents converted color value.</returns>
///
public static HSL FromRGB( RGB rgb )
{
HSL hsl = new HSL( );
FromRGB( rgb, hsl );
return hsl;
}
/// <summary>
/// Convert from RGB to HSL color space.
/// </summary>
///
/// <param name="rgb">Source color in <b>RGB</b> color space.</param>
/// <param name="hsl">Destination color in <b>HSL</b> color space.</param>
///
/// <remarks><para>See <a href="http://en.wikipedia.org/wiki/HSI_color_space#Conversion_from_RGB_to_HSL_or_HSV">HSL and HSV Wiki</a>
/// for information about the algorithm to convert from RGB to HSL.</para></remarks>
///
public static void FromRGB( RGB rgb, HSL hsl )
{
float r = ( rgb.Red / 255.0f );
float g = ( rgb.Green / 255.0f );
float b = ( rgb.Blue / 255.0f );
float min = Math.Min( Math.Min( r, g ), b );
float max = Math.Max( Math.Max( r, g ), b );
float delta = max - min;
// get luminance value
hsl.Luminance = ( max + min ) / 2;
if ( delta == 0 )
{
// gray color
hsl.Hue = 0;
hsl.Saturation = 0.0f;
}
else
{
// get saturation value
hsl.Saturation = ( hsl.Luminance <= 0.5 ) ? ( delta / ( max + min ) ) : ( delta / ( 2 - max - min ) );
// get hue value
float hue;
if ( r == max )
{
hue = ( ( g - b ) / 6 ) / delta;
}
else if ( g == max )
{
hue = ( 1.0f / 3 ) + ( ( b - r ) / 6 ) / delta;
}
else
{
hue = ( 2.0f / 3 ) + ( ( r - g ) / 6 ) / delta;
}
// correct hue if needed
if ( hue < 0 )
hue += 1;
if ( hue > 1 )
hue -= 1;
hsl.Hue = (int) ( hue * 360 );
}
}
/// <summary>
/// Paint the controls.
/// </summary>
///
/// <param name="pe">Paint event arguments.</param>
///
protected override void OnPaint( PaintEventArgs pe )
{
Graphics g = pe.Graphics;
Rectangle rc = this.ClientRectangle;
Rectangle rcPie;
Brush brush;
RGB rgb = new RGB( );
HSL hsl = new HSL( );
// get pie rectangle
rcPie = new Rectangle( 4, 4, System.Math.Min( rc.Right, rc.Bottom ) - 8, System.Math.Min( rc.Right, rc.Bottom ) - 8 );
// init HSL value
hsl.Luminance = 0.5f;
hsl.Saturation = 1.0f;
if ( type == HuePickerType.Value )
{
// draw HSL pie
for ( int i = 0; i < 360; i++ )
{
hsl.Hue = i;
// convert from HSL to RGB
BestCS.Imaging.HSL.ToRGB( hsl, rgb );
// create brush
brush = new SolidBrush( rgb.Color );
// draw one hue value
g.FillPie( brush, rcPie, -i, -1 );
brush.Dispose( );
}
}
else
{
// draw HSL pie
for ( int i = 0; i < 360; i++ )
{
if (
( ( min < max ) && ( i >= min ) && ( i <= max ) ) ||
( ( min > max ) && ( ( i >= min ) || ( i <= max ) ) ) )
{
hsl.Hue = i;
// convert from HSL to RGB
BestCS.Imaging.HSL.ToRGB( hsl, rgb );
// create brush
brush = new SolidBrush( rgb.Color );
}
else
{
brush = new SolidBrush( Color.FromArgb( 128, 128, 128 ) );
}
// draw one hue value
g.FillPie( brush, rcPie, -i, -1 );
brush.Dispose( );
}
}
//
double halfWidth = (double) rcPie.Width / 2;
double angleRad = -min * System.Math.PI / 180;
double angleCos = System.Math.Cos( angleRad );
double angleSin = System.Math.Sin( angleRad );
double x = halfWidth * angleCos;
double y = halfWidth * angleSin;
ptCenter.X = rcPie.Left + (int) ( halfWidth );
ptCenter.Y = rcPie.Top + (int) ( halfWidth );
ptMin.X = rcPie.Left + (int) ( halfWidth + x );
ptMin.Y = rcPie.Top + (int) ( halfWidth + y );
// draw MIN pointer
g.FillEllipse( blackBrush,
rcPie.Left + (int) ( halfWidth + x ) - 4,
rcPie.Top + (int) ( halfWidth + y ) - 4,
8, 8 );
g.DrawLine( blackPen, ptCenter, ptMin );
// check picker type
if ( type == HuePickerType.Range )
{
angleRad = -max * System.Math.PI / 180;
angleCos = System.Math.Cos( angleRad );
angleSin = System.Math.Sin( angleRad );
x = halfWidth * angleCos;
y = halfWidth * angleSin;
ptMax.X = rcPie.Left + (int) ( halfWidth + x );
ptMax.Y = rcPie.Top + (int) ( halfWidth + y );
// draw MAX pointer
g.FillEllipse( whiteBrush,
rcPie.Left + (int) ( halfWidth + x ) - 4,
rcPie.Top + (int) ( halfWidth + y ) - 4,
8, 8 );
g.DrawLine( whitePen, ptCenter, ptMax );
}
base.OnPaint( pe );
}
