NAME

       NGDOTS - Draws filled circular dots at coordinate positions (X(I),Y(I),I=1,NUM) at size
       SIZE with color given by the color index ICOLOR.

SYNOPSIS

       CALL NGDOTS(X,Y,NUM,SIZE,ICOLOR)

C-BINDING SYNOPSIS

       #include <ncarg/ncargC.h>

       void c_ngdots(float *x, float *y, int num, float size,
       int icolor)

DESCRIPTION

       X           (an input array of type REAL) defining the X world coordinates where a
                   sequence of circular filled dots is to be drawn.

       Y           (an input array of type REAL) defining the Y world coordinates where a
                   sequence of circular filled dots is to be drawn.

       NUM         (an input parameter of type INTEGER) the value of which is the number of dots
                   to be drawn.

       SIZE        (an input parameter of type REAL) the value of which is the size, in world
                   coordinate Y-axis units, of the diameter of each dot to be drawn.

       ICOLOR      (an input parameter of type INTEGER) the value of which is the GKS color index
                   specifying what color the dots will be.

C-BINDING DESCRIPTION

       The C binding argument descriptions are the same as the FORTRAN argument descriptions.

USAGE

       The coordinates must be world coordinates and not user coordinates.  NGDOTS does not
       respect the log scaling or axis reversal options of the SET call and will report a warning
       if these are not set to their default values.

       The dots are scaled appropriately so that they will be circular when the normalization
       transformation does not preserve aspect ratio.

       The algorithm is to construct a single circle and then translate it to the various
       coordinate positions.  The original circle is computed by using trig functions to get
       points in the first octant, and then using symmetries to get the rest of the points on the
       circle.

       The number of points used for the circle is adjusted depending on the relative size of the
       circle.  The maximum number of points is 512 and the minimum is 8.

EXAMPLES

       Assuming that normalization transformation 0 is in effect and that color index 2 has been
       defined as red in a call to GSCR, then

               CALL NGDOTS(.5,.25,1,.1,2)

       would draw a single red dot at world coordinate position (.5,.25) with a diameter of .1 .

       Use the ncargex command to see the following relevant example: fngngdts.

ACCESS

       To use NGDOTS or c_ngdots, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c,
       preferably in that order.

MESSAGES

       Warning messages will be issued if one calls NGDOTS after having called SET with any final
       argument other than "1".

SEE ALSO

       Online: gpm(3NCARG), point(3NCARG), points(3NCARG), set(3NCARG), ncarg_cbind(3NCARG)

       Online URL: http://ngwww.ucar.edu/ngdoc/ng/gks/gkshome.html

       Hardcopy: NCAR Graphics Fundamentals, UNIX Version; "The Use of X/Y Coordinates in NCAR
       Graphics" SCD User Document

COPYRIGHT

       Copyright (C) 1987-2009
       University Corporation for Atmospheric Research
       The use of this Software is governed by a License Agreement.