pods::SDL::Color(3pm) User Contributed Perl Documentation pods::SDL::Color(3pm)NAME
SDL::Color - Format independent color description
CATEGORY
Core, Video, Structure
SYNOPSIS
my $black = SDL::Color->new(0, 0, 0);
my $color = SDL::Color->new(255, 0, 0);
my $r = $color->r; # 255
my $g = $color->g; # 0
my $b = $color->b; # 0
$color->g(255);
$color->b(255);
# $color is now white
DESCRIPTION
"SDL_Color" describes a color in a format independent way.
METHODS
new
my $color = SDL::Color->new(255, 0, 0);
The constructor creates a new color with the specified red, green and blue values.
r
my $r = $color->r;
$color->r(128);
If passed a value, this method sets the red component of the color; if not, it returns the red component of the color.
g
my $g = $color->g;
$color->g(128);
If passed a value, this method sets the green component of the color; if not, it returns the green component of the color.
b
my $b = $color->b;
$color->b(128);
If passed a value, this method sets the blue component of the color; if not, it returns the blue component of the color.
SEE ALSO
SDL::Surface
AUTHORS
See "AUTHORS" in SDL.
perl v5.14.2 2012-05-28 pods::SDL::Color(3pm)
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Convert::Color::RGB8(3pm) User Contributed Perl Documentation Convert::Color::RGB8(3pm)NAME
"Convert::Color::RGB8" - a color value represented as red/green/blue in 8-bit integers
SYNOPSIS
Directly:
use Convert::Color::RGB8;
my $red = Convert::Color::RGB8->new( 255, 0, 0 );
# Can also parse strings
my $pink = Convert::Color::RGB8->new( '255,192,192' );
# or
$pink = Convert::Color::RGB8->new( 'ffc0c0' );
Via Convert::Color:
use Convert::Color;
my $cyan = Convert::Color->new( 'rgb8:0,255,255' );
DESCRIPTION
Objects in this class represent a color in RGB space, as a set of three integer values in the range 0 to 255; i.e. as 8 bits.
For representations using floating point values, see Convert::Color::RGB. For representations using 16-bit integers, see
Convert::Color::RGB16.
CONSTRUCTOR
$color = Convert::Color::RGB8->new( $red, $green, $blue )
Returns a new object to represent the set of values given. These values should be integers between 0 and 255. Values outside of this range
will be clamped.
$color = Convert::Color::RGB8->new( $string )
Parses $string for values, and construct a new object similar to the above three-argument form. The string should be in the form
red,green,blue
containing the three integer values in decimal notation. It can also be given in the form of a hex encoded string, such as would be
returned by the "rgb8_hex" method:
rrggbb
METHODS
$r = $color->red
$g = $color->green
$b = $color->blue
Accessors for the three components of the color.
( $red, $green, $blue ) = $color->rgb8
Returns the individual red, green and blue color components of the color value in RGB8 space.
$str = $color->hex
Returns a string representation of the color components in the RGB8 space, in a convenient "RRGGBB" hex string, likely to be useful HTML,
or other similar places.
$mix = $color->alpha_blend( $other, [ $alpha ] )
Return a new color which is a blended combination of the two passed into it. The optional $alpha parameter defines the mix ratio between
the two colors, defaulting to 0.5 if not defined. Values closer to 0 will blend more of $color, closer to 1 will blend more of $other.
$mix = $color->alpha8_blend( $other, [ $alpha ] )
Similar to "alpha_blend" but works with integer arithmetic. $alpha should be an integer in the range 0 to 255.
$measure = $color->dst_rgb8( $other )
Return a measure of the distance between the two colors. This is the unweighted Euclidean distance of the three color components. Two
identical colors will have a measure of 0, pure black and pure white have a distance of 1, and all others will lie somewhere inbetween.
$measure = $color->dst_rgb8_cheap( $other )
Return a measure of the distance between the two colors. This is the sum of the squares of the differences of each of the color components.
This is part of the value used to calculate "dst_rgb8", but since it involves no square root it will be cheaper to calculate, for use in
cases where only the relative values matter, such as when picking the "best match" out of a set of colors. It ranges between 0 for
identical colours and 3*(255^2) for the distance between pure black and pure white.
SEE ALSO
o Convert::Color - color space conversions
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.12.3 2011-06-15 Convert::Color::RGB8(3pm)