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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

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glubegincurve

GLUBEGINCURVE(3G)														 GLUBEGINCURVE(3G)

NAME

       gluBeginCurve, gluEndCurve - delimit a NURBS curve definition

C SPECIFICATION

       void gluBeginCurve( GLUnurbs* nurb )

       void gluEndCurve( GLUnurbs* nurb )

PARAMETERS

       nurb  Specifies the NURBS object (created with gluNewNurbsRenderer).

DESCRIPTION

       Use  gluBeginCurve to mark the beginning of a NURBS curve definition.  After calling gluBeginCurve, make one or more calls to gluNurbsCurve
       to define the attributes of the curve.  Exactly one of  the  calls  to  gluNurbsCurve  must  have  a  curve  type  of  GL_MAP1_VERTEX_3	or
       GL_MAP1_VERTEX_4.  To mark the end of the NURBS curve definition, call gluEndCurve.

       GL  evaluators  are  used  to  render  the  NURBS  curve  as a series of line segments.	Evaluator state is preserved during rendering with
       glPushAttrib(GL_EVAL_BIT) and glPopAttrib().  See the glPushAttrib reference page for details on exactly what state these calls preserve.

EXAMPLE

       The following commands render a textured NURBS curve with normals; texture coordinates and normals are also specified as NURBS curves:

       gluBeginCurve(nobj);
	  gluNurbsCurve(nobj, ..., GL_MAP1_TEXTURE_COORD_2);
	  gluNurbsCurve(nobj, ..., GL_MAP1_NORMAL);
	  gluNurbsCurve(nobj, ..., GL_MAP1_VERTEX_4); gluEndCurve(nobj);

SEE ALSO

       gluBeginSurface(3G), gluBeginTrim(3G), gluNewNurbsRenderer(3G), gluNurbsCurve(3G), glPopAttrib(3G), glPushAttrib(3G)

																 GLUBEGINCURVE(3G)

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