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03-25-2009

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XMGRACE help

Dear all,

Im hoping you may be able to help with a little problem Im having using xmgrace.
I want to plot a dataset as a line curve e.g 1,2,3,4,5,6,15,16,17,18,19,20...

what i would like to do is not plot the missing bits of the sequence, i.e 1-6 would be a straight line then there would be a gap between 6 - 15 (NO line) followed by a line for 15-20... Xmgrace automatically joins the two bits up? is there away to stop it form doing this?

Mish

Mish_99

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glupwlcurve

GLUPWLCURVE(3G) 														   GLUPWLCURVE(3G)

NAME

       gluPwlCurve - describe a piecewise linear NURBS trimming curve

C SPECIFICATION

       void gluPwlCurve( GLUnurbs* nurb,
			 GLint count,
			 GLfloat* data,
			 GLint stride,
			 GLenum type )

PARAMETERS

       nurb    Specifies the NURBS object (created with gluNewNurbsRenderer).

       count   Specifies the number of points on the curve.

       data    Specifies an array containing the curve points.

       stride  Specifies the offset (a number of single-precision floating-point values) between points on the curve.

       type    Specifies the type of curve.  Must be either GLU_MAP1_TRIM_2 or GLU_MAP1_TRIM_3.

DESCRIPTION

       gluPwlCurve describes a piecewise linear trimming curve for a NURBS surface.  A piecewise linear curve consists of a list of coordinates of
       points in the parameter space for the NURBS surface to be trimmed. These points are connected with line segments to form a  curve.  If  the
       curve  is an approximation to a curve that is not piecewise linear, the points should be close enough in parameter space that the resulting
       path appears curved at the resolution used in the application.

       If type is GLU_MAP1_TRIM_2, then it describes a curve in two-dimensional (u and v) parameter space.  If	it  is	GLU_MAP1_TRIM_3,  then	it
       describes  a  curve in two-dimensional homogeneous (u, v, and w) parameter space.  See the gluBeginTrim reference page for more information
       about trimming curves.

NOTES

       To describe a trim curve that closely follows the contours of a NURBS surface, call gluNurbsCurve.

SEE ALSO

       gluBeginCurve(3G), gluBeginTrim(3G), gluNewNurbsRenderer(3G), gluNurbsCurve(3G)

																   GLUPWLCURVE(3G)

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