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Magick::Geometry

Geometry provides a convenient means to specify a geometry argument. The object may be initialized from a C string or C++ string containing a geometry specification. It may also be initialized by more efficient parameterized constructors.

X11 Geometry Specifications

X11 geometry specifications are in the form "<width>x<height>{+-}<xoffset>{+-}<yoffset>" (where width, height, xoffset, and yoffset are numbers) for specifying the size and placement location for an object.

The width and height parts of the geometry specification are measured in pixels. The xoffset and yoffset parts are also measured in pixels and are used to specify the distance of the placement coordinate from the left and top and edges of the image, respectively. Both types of offsets are measured from the indicated edge of the object to the corresponding edge of the image. The X offset may be specified in the following ways:

The Y offset has similar meanings:

Offsets must be given as pairs; in other words, in order to specify either xoffset or yoffset both must be present.

ImageMagick Extensions To X11 Geometry Specifications

ImageMagick has added a number of qualifiers to the standard geometry string for use when resizing images. The form of an extended geometry string is "<width>x<height>{+-}<xoffset>{+-}<yoffset>{%}{!}{<}{>}". Extended geometry strings should only be used when resizing an image. Using an extended geometry string for other applications may cause the API call to fail. The available qualifiers are shown in the following table:

ImageMagick Geometry Qualifiers

Postscript Page Size Extension To Geometry Specifications

Any geometry string specification supplied to the Geometry constructor is considered to be a Postscript page size nickname if the first character is not numeric. The Geometry constructor converts these page size specifications into the equivalent numeric geometry string specification (preserving any offset component) prior to conversion to the internal object format. Postscript page size specifications are short-hand for the pixel geometry required to fill a page of that size. Since the 11x17 inch page size used in the US starts with a digit, it is not supported as a Postscript page size nickname. Instead, substitute the geometry specification "792x1224>" when 11x17 output is desired.

An example of a Postscript page size specification is "letter+43+43>".

Postscript Page Size Nicknames

Geometry Methods

Geometry provides methods to initialize its value from strings, from a set of parameters, or via attributes. The methods available for use in Geometry are shown in the following table:

Geometry Methods