Color Class Reference

#include <color.hh>

Inheritance diagram for Color:

Collaboration diagram for Color:

Public Member Functions
	Color ()=default
	Color (double red_, double green_, double blue_, double alpha_=1.0)
	Color (double gray, double alpha_=1.0)
Color &	operator+= (const Color &rhs)
Color &	operator/= (double d)
Color &	operator*= (double d)
std::string	getHex () const
uint32_t	getRGB24 () const
uint32_t	getARGB32 () const
void	setColor (cairo_t *cr) const
GdkColor	getGdkColor () const
Color	getContrastingBlackOrWhite () const
Color &	setAlpha (double alpha_)
Color	setAlpha (double alpha_) const

Public Attributes
double	alpha {1.0}
double	red {0.0}
double	green {0.0}
double	blue {0.0}

Detailed Description

Represent a (ARGB) color

Constructor & Destructor Documentation

Color() [1/3]

Color::Color ( )

default

Default constructor. Create black

Referenced by getContrastingBlackOrWhite(), and setAlpha().

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Color() [2/3]

Color::Color ( double  red_, double  green_, double  blue_, double  alpha_ = 1.0  )

inline

Constructor. Use the given RGB values

    : alpha(alpha_)
    , red(red_)
    , green(green_)
    , blue(blue_)
  {
  }

Color() [3/3]

Color::Color ( double  gray, double  alpha_ = 1.0  )

inlineexplicit

Constructor. Create the given gray value

    : alpha(alpha_)
    , red(gray)
    , green(gray)
    , blue(gray)
  {
  }

Member Function Documentation

getARGB32()

uint32_t Color::getARGB32 ( ) const

inline

  {
    return byteFromDouble(alpha) << 24 | byteFromDouble(red) << 16 | byteFromDouble(green) << 8 | byteFromDouble(blue) << 0;
  }

Referenced by Operations8bpp::cache(), and OperationsColormapped::cache().

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getContrastingBlackOrWhite()

Color Color::getContrastingBlackOrWhite ( ) const

inline

  {
    // see http://stackoverflow.com/a/3943023
    const double L = 0.2126 * Detail::computeC(red) + 0.7152 * Detail::computeC(green) + 0.0722 * Detail::computeC(blue);
    return Color(L > 0.179 ? 0 : 1);
  }

Referenced by CommonOperations::drawPixelValue(), and anonymous_namespace{transparentoverlayviewinfo.cc}::setToggleButtonColor().

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getGdkColor()

GdkColor Color::getGdkColor ( ) const

inline

{ return {0, shortFromDouble(red), shortFromDouble(green), shortFromDouble(blue)}; }

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getHex()

std::string Color::getHex ( ) const

inline

  {
    std::stringstream ss;
 
    ss << std::hex << std::setfill('0');
 
 
    ss << std::hex << std::setw(2) << static_cast<int>(byteFromDouble(red));
    ss << std::hex << std::setw(2) << static_cast<int>(byteFromDouble(green));
    ss << std::hex << std::setw(2) << static_cast<int>(byteFromDouble(blue));
 
    return ss.str();
  }

Referenced by anonymous_namespace{transparentoverlayviewinfo.cc}::setToggleButtonColor().

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getRGB24()

uint32_t Color::getRGB24 ( ) const

inline

  {
    return 0xFF000000 | byteFromDouble(red) << 16 | byteFromDouble(green) << 8 | byteFromDouble(blue) << 0;
  }

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operator*=()

Color& Color::operator*= ( double  d )

inline

  {
    alpha *= d;
    red *= d;
    green *= d;
    blue *= d;
    return *this;
  }

operator+=()

Color& Color::operator+= ( const Color &  rhs )

inline

  {
    alpha += rhs.alpha;
    red += rhs.red;
    green += rhs.green;
    blue += rhs.blue;
    return *this;
  }

operator/=()

Color& Color::operator/= ( double  d )

inline

  {
    alpha /= d;
    red /= d;
    green /= d;
    blue /= d;
    return *this;
  }

setAlpha() [1/2]

Color& Color::setAlpha ( double  alpha_ )

inline

{ return *this *= alpha_; }

Referenced by MonochromeColormapHelper::regenerateColormap().

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setAlpha() [2/2]

Color Color::setAlpha ( double  alpha_ ) const

inline

{ return Color(*this).setAlpha(alpha_); }

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setColor()

void Color::setColor ( cairo_t *  cr ) const

inline

{ cairo_set_source_rgba(cr, red, green, blue, alpha); }

Referenced by CommonOperations::drawPixelValue(), drawRectangle(), and drawRectangleContour().

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Member Data Documentation

alpha

double Color::alpha {1.0}

Alpha value

Referenced by getARGB32(), anonymous_namespace{transparentoverlaypresentation.cc}::ColorComparer::operator()(), operator*=(), operator+=(), operator/=(), and setColor().

blue

double Color::blue {0.0}

B value

Referenced by BOOST_AUTO_TEST_CASE(), getARGB32(), getContrastingBlackOrWhite(), getGdkColor(), getHex(), getRGB24(), anonymous_namespace{transparentoverlaypresentation.cc}::ColorComparer::operator()(), operator*=(), operator+=(), operator/=(), and setColor().

green

double Color::green {0.0}

G value

Referenced by BOOST_AUTO_TEST_CASE(), getARGB32(), getContrastingBlackOrWhite(), getGdkColor(), getHex(), getRGB24(), anonymous_namespace{transparentoverlaypresentation.cc}::ColorComparer::operator()(), operator*=(), operator+=(), operator/=(), and setColor().

red

double Color::red {0.0}

R value

Referenced by BOOST_AUTO_TEST_CASE(), getARGB32(), getContrastingBlackOrWhite(), getGdkColor(), getHex(), getRGB24(), anonymous_namespace{transparentoverlaypresentation.cc}::ColorComparer::operator()(), operator*=(), operator+=(), operator/=(), and setColor().

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The documentation for this class was generated from the following file:

• inc/scroom/color.hh