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plvect(3plplot) [debian man page]

PLVECT(3plplot) 						    PLplot API							   PLVECT(3plplot)

NAME

       plvect - Vector plot

SYNOPSIS

       plvect(u, v, nx, ny, scale, pltr, pltr_data)

DESCRIPTION

       Draws  a  vector  plot  of the vector (u[nx][ny],v[nx][ny]). The scaling factor for the vectors is given by scale. A transformation routine
       pointed to by pltr with a pointer pltr_data for additional data required by the transformation routine is used to map  indices  within  the
       array to the world coordinates. The style of the vector arrow may be set using plsvect(3plplot).

       Redacted form: plvect(u, v, scale, pltr, pltr_data)

       This function is used in example 22.

ARGUMENTS

       u, v (PLFLT **, input)
	      Pointers to a pair of vectored two-dimensional arrays containing the x and y components of the vector data to be plotted.

       nx, ny (PLINT, input)
	      Physical dimensions of the arrays u and v.

       scale (PLFLT, input)
	      Parameter  to  control  the scaling factor of the vectors for plotting. If scale = 0 then the scaling factor is automatically calcu-
	      lated for the data. If scale < 0 then the scaling factor is automatically calculated for the data and then multiplied by -scale.	If
	      scale > 0 then the scaling factor is set to scale.

       pltr (void (*) (PLFLT, PLFLT, PLFLT *, PLFLT *, PLPointer) , input)
	      Pointer to function that defines transformation between indices in array z and the world coordinates (C only).  Transformation func-
	      tions are provided in the PLplot library: pltr0(3plplot) for identity mapping, and pltr1(3plplot) and pltr2(3plplot)  for  arbitrary
	      mappings respectively defined by one- and two-dimensional arrays.  In addition, user-supplied routines for the transformation can be
	      used as well.  Examples of all of these approaches are given in the PLplot documentation. The transformation  function  should  have
	      the form given by any of pltr0(3plplot), pltr1(3plplot), or pltr2(3plplot).

       pltr_data (PLPointer, input)
	      Extra  parameter	to help pass information to pltr0(3plplot), pltr1(3plplot), pltr2(3plplot), or whatever routine that is externally
	      supplied.

AUTHORS

       Geoffrey Furnish and Maurice LeBrun wrote and maintain PLplot.  This man page was automatically generated from the DocBook  source  of  the
       PLplot documentation, maintained by Alan W. Irwin and Rafael Laboissiere.

SEE ALSO

       PLplot documentation at http://plplot.sourceforge.net/resources.

								   August, 2012 						   PLVECT(3plplot)

Check Out this Related Man Page

PLGRADIENT(3plplot)						    PLplot API						       PLGRADIENT(3plplot)

NAME

       plgradient - Draw linear gradient inside polygon

SYNOPSIS

       plgradient(n, x, y, angle)

DESCRIPTION

       Draw  a	linear	gradient using colour map 1 inside the polygon defined by the n points (x[i], y[i]).  Interpretation of the polygon is the
       same as for plfill(3plplot).  The polygon coordinates and the gradient angle are all expressed in world coordinates.  The angle from the  x
       axis  for  both	the  rotated coordinate system and the gradient vector is specified by angle.  The magnitude of the gradient vector is the
       difference between the maximum and minimum values of x for the vertices in the rotated coordinate system.  The origin of the gradient  vec-
       tor  can  be interpreted as being anywhere on the line corresponding to the minimum x value for the vertices in the rotated coordinate sys-
       tem.  The distance along the gradient vector is linearly transformed to the independent variable of colour map 1 which ranges  from  0.	at
       the  tail  of the gradient vector to 1. at the head of the gradient vector.  What is drawn is the RGBA colour corresponding to the indepen-
       dent variable of colour map 1.  For more information about colour map 1 (see the PLplot documentation).

       Redacted form: plgradient(x,y,angle)

       This function is used in examples 25,30.

ARGUMENTS

       n (PLINT, input)
	      Number of vertices in polygon.

       x (PLFLT *, input)
	      Pointer to array with x coordinates of vertices.

       y (PLFLT *, input)
	      Pointer to array with y coordinates of vertices.

       angle (PLFLT, input)
	      Angle (degrees) of gradient vector from x axis.

AUTHORS

       Geoffrey Furnish and Maurice LeBrun wrote and maintain PLplot.  This man page was automatically generated from the DocBook  source  of  the
       PLplot documentation, maintained by Alan W. Irwin and Rafael Laboissiere.

SEE ALSO

       PLplot documentation at http://plplot.sourceforge.net/resources.

								   August, 2012 					       PLGRADIENT(3plplot)
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