Struct classes |
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Table Of Contents |
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Miscellaneous structuresThese 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 |
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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. |
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) |
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 |
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to_HSL | pixel.to_HSL -> anArray |
Description | Returns the array [hue, saturation, luminosity] corresponding the the pixel RGB values. |
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. |
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. |
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. |
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 | |
y1 | |
x2 | |
y2 |