How to concatenate string containing a leading dash? Post: 302377749

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tk_getdash

Tk_GetDash(3)						       Tk Library Procedures						     Tk_GetDash(3)

__________________________________________________________________________________________________________________________________________________

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 converted.

       Tk_Dash *dashPtr (out)	      Points to place to store the dash pattern value converted from string.
_________________________________________________________________

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 does not have the proper syntax then TCL_ERROR	is
       returned, an error message is left in the interpreter's result, and nothing is stored at *dashPtr.

       The  first possible syntax is a list of integers. Each element 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 position 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 is 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 pattern 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

Tk									8.3							     Tk_GetDash(3)