Table Of Contents
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Miscellaneous structures
These structure classes are used to create objects
used as attribute and argument values in other RMagick
classes. Generally the classes define only attributes and
their accessor methods. The Pixel structure,
however, defines additional constructors and conversion
methods.
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class
AffineMatrix |
class methods
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new |
Magick::AffineMatrix.new(sx, rx,
ry, sy, tx, ty) ->
anAffineMatrix |
Description |
An AffineMatrix object describes a coordinate
transformation. This object is used as an argument to the
Frame#affine_transform,
Frame#composite_affine,
and Draw#affine=
methods. |
attributes
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sx |
The amount of scaling on the x-axis. |
rx |
The amount of rotation on the x-axis, in radians. |
ry |
The amount of rotation on the x-axis, in radians. |
sy |
The amount of scaling on the y-axis. |
tx |
The amount of translation on the x-axis, in
pixels. |
ty |
The amount of translation on the y-axis, in
pixels. |
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class
Chromaticity |
class methods
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new |
Magick::Chromaticity.new(red_primary,
green_primary, blue_primary,
white_point) -> anChromaticity |
Description |
A Chromaticity object represents chromaticity values
for the Frame#chromaticity
attribute. |
attributes
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The attribute values are Primary objects. |
red_primary |
Red primary point (e.g.
red_primary.x=0.64, red_primary.y=0.33) |
green_primary |
Green primary point (e.g.
green_primary.x=0.3, green_primary.y=0.6) |
blue_primary |
Blue primary point (e.g.
blue_primary.x=0.15, blue_primary.y=0.06) |
white_point |
White point (e.g. white_point.x=0.3127,
white_point.y=0.329) |
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class Pixel |
class methods
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new |
Magick::Pixel.new(red, green,
blue, opacity) -> aPixel |
Description |
Constructs a pixel object from the specified red,
green, blue, and opacity intensities. |
from_color |
Magick::Pixel.from_color(color_name)
-> aPixel |
Description |
Constructs a pixel object corresponding to the
specified color
name. Raises ArgumentError if the name is unknown. See
Pixel#to_color, below. |
from_HSL |
Magick::Pixel.from_HSL(hue,
saturation, luminosity) ->
aPixel |
Description |
Constructs a pixel object from the specified hue,
saturation, and luminosity values. See Pixel#to_HSL, below. |
attributes
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The attribute values are numbers between
0 and MaxRGB. If the image is in the CMYKColorspace, the
red, green, blue, and opacity attributes are interpreted as
cyan, magenta, yellow, and black intensities,
respectively. |
red |
The red intensity |
green |
The green intensity |
blue |
The blue intensity |
opacity |
The opacity level. You can use the TransparentOpacity
or OpaqueOpacity constants for this attribute as well as a
number. |
instance methods
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to_color |
pixel.to_color(compliance=AllCompliance,
matte=false , depth=8 or 16)
-> aString |
Description |
Returns the color
name corresponding the the pixel values. If there is no
such named color in the specified color standard, returns a
string in the form "#RRGGBBOO" or, if the depth is 16,
"#RRRRGGGGBBBBOOOO". |
Arguments |
- compliance
- A ComplianceType
constant. The default value of AllCompliance causes
to_color to search for a color name in any
of the 3 defined color standards.
- matte
- If false, the pixel's opacity attribute is
ignored.
- depth
- An image depth. The default is the quantum depth
used when ×Magick was compiled. The value 16 can
be used only when ×Magick was compiled with a
quantum depth of 16.
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to_HSL |
pixel.to_HSL -> anArray |
Description |
Returns the array [hue, saturation, luminosity]
corresponding the the pixel RGB values. |
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class Point |
class methods
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new |
Magick::Point.new(x, y) ->
aPoint |
Description |
An object of this Struct class is used as the value of
the pixels_per_em attribute in the TypeMetric
struct returned by Draw#get_type_metrics. |
attributes
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x |
Character width. |
y |
Character height. |
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class Primary |
class methods
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new |
Magick::Primary.new(x, y, z) ->
aPrimary |
Description |
See class
Chromaticity. |
attributes
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x |
X ordinate. |
y |
Y ordinate. |
z |
Z ordinate. This attribute is always
ignored. |
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class
Rectangle |
class methods
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new |
Magick::Rectangle.new(width, height,
x, y) -> aRectangle |
Description |
The value of the Image#tile_info and
Image#bounding_box
attributes. |
attributes
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width |
Rectangle width. |
height |
Rectangle height. |
x |
Offset from the left edge of the
image. |
y |
Offset from the top edge of the
image. |
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class Segment |
class methods
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new |
Magick::Segment.new(x1, y1, x2,
y2) -> aSegment |
Description |
The value of the bounds attribute in the TypeMetric
class. |
attributes
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x1 |
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y1 |
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x2 |
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y2 |
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