DELP(3g) — Subroutines
Name
DELP − Specifies the 2D, shorthand form of the filled ellipse primitive.
Operating States: PHOP, ∗, STOP, ∗
Digital PHIGS extension function
Creates a structure element
Syntax
DELP (PX, PY, MAJORX, MAJORY, MINORX, MINORY)
Argument Data Type Access Description
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PX, PY Real Read Center point of the ellipse, in
modeling coordinates
MAJORX, Real Read Vector that defines the x-axis
MAJORY
MINORX, Real Read Vector that defines the y-axis
MINORY
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Description
DELP specifies the two-dimensional (x and y), shorthand form of the filled ellipse primitive. The ellipse local coordinate system is the xy-plane as defined in the modeling coordinate system. Digital PHIGS assumes the z-coordinate is 0.
Depending on the edit mode, this function either inserts the new structure element directly after the element indicated by the pointer or replaces the element indicated by the pointer. The pointer then points to the new filled ellipse element. This primitive uses the interior attributes.
During structure traversal, Digital PHIGS generates a filled ellipse. Digital PHIGS binds the current values of the interior attributes as defined in the PHIGS traversal state list to the primitive, and renders it according to the current curve approximation criteria.
If the magnitudes of both axes are less than or equal to 0, Digital PHIGS displays a dot. If one of the axes is less than or equal to 0, Digital PHIGS displays a line of the correct magnitude. If the axes do not define the system (the vectors are parallel and nonzero), Digital PHIGS uses (1,0,0) for the major axis and (0,1,0) for the minor axis.
If Digital PHIGS is in immediate mode, it performs this function immediately, but the function does not create a structure element.
See Also
PADS
PQPLF
PRES
PSDCI
PSHRID
PSIASF
PSLN
PSLWSC
PSPKID
PSPLC
PSPLCI
PSPLI
PSPLSM
PSVWI