Unix/Linux Go Back    


X11R7.4 - man page for xtextitem (x11r4 section 3)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)


XDrawText(3)				  XLIB FUNCTIONS			     XDrawText(3)

NAME
       XDrawText, XDrawText16, XTextItem, XTextItem16 - draw polytext text and text drawing
       structures

SYNTAX
       int XDrawText(Display *display, Drawable d, GC gc, int x, int y, XTextItem *items, int
	      nitems);

       int XDrawText16(Display *display, Drawable d, GC gc, int x, int y, XTextItem16 *items, int
	      nitems);

ARGUMENTS
       d	 Specifies the drawable.

       display	 Specifies the connection to the X server.

       gc	 Specifies the GC.

       items	 Specifies an array of text items.

       nitems	 Specifies the number of text items in the array.

       x
       y	 Specify the x and y coordinates, which are relative to the origin of the speci-
		 fied drawable and define the origin of the first character.

DESCRIPTION
       The XDrawText16 function is similar to XDrawText except that it uses 2-byte or 16-bit
       characters.  Both functions allow complex spacing and font shifts between counted strings.

       Each text item is processed in turn.  A font member other than None in an item causes the
       font to be stored in the GC and used for subsequent text.  A text element delta specifies
       an additional change in the position along the x axis before the string is drawn.  The
       delta is always added to the character origin and is not dependent on any characteristics
       of the font.  Each character image, as defined by the font in the GC, is treated as an
       additional mask for a fill operation on the drawable.  The drawable is modified only where
       the font character has a bit set to 1.  If a text item generates a BadFont error, the pre-
       vious text items may have been drawn.

       For fonts defined with linear indexing rather than 2-byte matrix indexing, each XChar2b
       structure is interpreted as a 16-bit number with byte1 as the most significant byte.

       Both functions use these GC components: function, plane-mask, fill-style, font, subwindow-
       mode, clip-x-origin, clip-y-origin, and clip-mask.  They also use these GC mode-dependent
       components: foreground, background, tile, stipple, tile-stipple-x-origin, and tile-stip-
       ple-y-origin.

       XDrawText and XDrawText16 can generate BadDrawable, BadFont, BadGC, and BadMatch errors.

STRUCTURES
       The XTextItem and XTextItem16 structures contain:

       typedef struct {
	    char *chars;	     /* pointer to string */
	    int nchars; 	     /* number of characters */
	    int delta;		     /* delta between strings */
	    Font font;		     /* Font to print it in, None don't change */
       } XTextItem;

       typedef struct {
	    XChar2b *chars;	     /* pointer to two-byte characters */
	    int nchars; 	     /* number of characters */
	    int delta;		     /* delta between strings */
	    Font font;		     /* font to print it in, None don't change */
       } XTextItem16;

       If the font member is not None, the font is changed before printing and also is stored in
       the GC.	If an error was generated during text drawing, the previous items may have been
       drawn.  The baseline of the characters are drawn starting at the x and y coordinates that
       you pass in the text drawing functions.

       For example, consider the background rectangle drawn by XDrawImageString.  If you want the
       upper-left corner of the background rectangle to be at pixel coordinate (x,y), pass the
       (x,y + ascent) as the baseline origin coordinates to the text functions.  The ascent is
       the font ascent, as given in the XFontStruct structure.	If you want the lower-left corner
       of the background rectangle to be at pixel coordinate (x,y), pass the (x,y - descent + 1)
       as the baseline origin coordinates to the text functions.  The descent is the font
       descent, as given in the XFontStruct structure.

DIAGNOSTICS
       BadDrawable
		 A value for a Drawable argument does not name a defined Window or Pixmap.

       BadFont	 A value for a Font or GContext argument does not name a defined Font.

       BadGC	 A value for a GContext argument does not name a defined GContext.

       BadMatch  An InputOnly window is used as a Drawable.

SEE ALSO
       XDrawImageString(3X11), XDrawString(3X11), XLoadFont(3X11)
       Xlib - C Language X Interface

X Version 11				   libX11 1.2.1 			     XDrawText(3)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums


All times are GMT -4. The time now is 03:37 AM.