Specify this if you want this curve to be a clone of an existing curve. (note - this uses a shared underlying curve object, it does not make a copy)

The RGB color of this object as imported from an external format (e.g. IGES) or as specified in :display-controls. Defaults to the foreground color specified in *colors-default*. This message should not normally be overridden in user application code.

Indicates whether the object should effectively be a hidden-object even if specified in :objects. Default is nil.

Synonym for the layer.

Points to a pre-existing image file to be displayed instead of actual geometry for this object. Defaults to nil

The primary IGES-compatible level (layer) on which this object resides. Defaults to the first of the levels. This slot can be overridden in user code to specify a new layer which will be written out when this object is exported with the IGES output-format.

The IGES-compatible levels (layers) on which this object resides. GDL does not currently support writing out multiple levels (layers) through the IGES writer ; only the first of these will be output if the object is exported with the IGES output-format (please contact Genworks if you need all levels (layers) to be written out).

The left front bottom and right rear top corners, in global coordinates, of the rectangular volume bounding this geometric object.

This is synonymous with the orientation.

If non-nil, this function gets invoked when the user clicks the object in graphics front-ends which may or may not support this functionality (see viewport-html-div).

The root-level node in this object's ``tree'' (instance hierarchy).

All objects from the :objects specification, including elements of sequences as flat lists. Any children which throw errors come back as a plist with error information

Determines how the name of objects of this type will be printed in most places. This defaults to the name-for-display (generally the part's name as specified in its parent), followed by an index number if the part is an element of a sequence.

Additional objects to display in Tatu tree. Typically this would be a subset of hidden-children. Defaults to NIL.

Approximation tolerance for display purposes. Defaults to the tolerance of the built-from curve, if one exists, otherwise defaults to the *display-tolerance*.

Indicates in global coordinates where the center of the reference box of this object should be located.

May contain keywords and values indicating display characteristics for this object. The following keywords are recognized currently:

:color

color keyword from the *color-table* parameter, or an HTML-style hexidecimal RGB string value, e.g. "#FFFFFF" for pure white. Defaults to :black.

:line-thickness

an integer, defaulting to 1, indicating relative line thickness for wireframe representations of this object.

:dash-pattern

(currently PDF/PNG/JPEG only). This is a list of two or three numbers which indicate the length, in pixels, of the dashes and blank spaces in a dashed line. The optional third number indicates how far into the line or curve to start the dash pattern.

Z-axis dimension of the reference box. Defaults to zero.

Y-axis dimension of the reference box. Defaults to zero.

Indicates the absolute Rotation Matrix used to create the coordinate system of this object. This matrix is given in absolute terms (i.e. with respect to the root's orientation), and is generally created with the alignment function. It should be an orthonormal matrix, meaning each row is a vector with a magnitude of one (1.0).

X-axis dimension of the reference box. Defaults to zero.

The faces connected to this edge.

This represents the UV curve for this edge on the given surface. Note that you have to pass in the surface, which should be the basis-surface of a face connected to this edge. The GDL edge object will be supplemented with a sequence of faces which are connected with this edge.