Flashnux

GNU/Linux man pages

Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :

ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)

GNU/Linux

CentOS 2.1AS

(Slurm)

Tk_GetDash(3)


Tk_GetDash

Tk_GetDash

NAME
SYNOPSIS
ARGUMENTS
DESCRIPTION
KEYWORDS

______________________________________________________________________________

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 doesn’t 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 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 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_GetDash(3)