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NAME
     Tk_GetDash - convert from string to valid dash structure.

SYNOPSIS
     #include <tk.h>

     int
     Tk_GetDash(interp, string, dashPtr)

ARGUMENTS
     Tcl_Interp           *interp(in)
                                    Interpreter to use for  error
                                    reporting.

     CONST char *         string(in)
                                    Textual  value  to  be   con-
                                    verted.

     Tk_Dash   *dashPtr   (out)     Points to place to store  the
                                    dash  pattern value converted
                                    from string.
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DESCRIPTION
     These procedure parses the string and fills in the result in
     the  Tk_Dash structure. The string can be a list of integers
     or a character string containing only [.,-_] or  spaces.  If
     all  goes  well,  TCL_OK is returned. If string doesn't have
     the proper syntax then TCL_ERROR is returned, an error  mes-
     sage  is  left  in  the interpreter's result, and nothing is
     stored at *dashPtr.

     The first possible syntax is a list of integers.  Each  ele-
     ment represents the number of pixels of a line segment. Only
     the odd segments are drawn using the  "outline"  color.  The
     other segments are drawn transparent.

     The second possible syntax is a  character  list  containing
     only 5 possible characters [.,-_ ]. The space can be used to
     enlarge the space between other line elements, and  can  not
     occur as the first posibion in the string. Some examples:
         -dash .     = -dash {2 4}
         -dash -     = -dash {6 4}
         -dash -.    = -dash {6 4 2 4}
         -dash -..   = -dash {6 4 2 4 2 4}
         -dash {. }  = -dash {2 8}
         -dash ,     = -dash {4 4}


     The main difference of this syntax with the previous is that
     it  it  shape-conserving.  This means that all values in the
     dash list will  be  multiplied  by  the  line  width  before
     display. This assures that "." will always be displayed as a
     dot and "-" always as a dash regardless of the line width.

     On systems where only a limited set of  dash  patterns,  the
     dash  pattern  will be displayed as the most close dash pat-
     tern that is available. For example,  on  Windows  only  the
     first  4  of  the  above  examples are available. The last 2
     examples will be displayed identically as the first one.


KEYWORDS
     dash, conversion

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