plotutils-graph-patches-lloda/libplot/x_afftext.h

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/* This is a header file for the XAffText module, which was originally
   independent of libplot.  The module is in x_afftext.c.  It may be used
   independently of libplot.

   To use the module independently of libplot, simply do not specify
   "-DLIBPLOT" at compile time.

   The module supplies two external functions, which are generalizations of
   the core X11 function XDrawString: XAffDrawRotString and
   XAffDrawAffString.  They draw, respectively, a rotated text string and
   (more generally) a matrix-transformed text string, using a specified
   core X font.  The rotation angle and transformation matrix are specified
   by the user.  The matrix is passed as a 4-element array, with the
   element ordering convention, and sign conventions, being those of the
   Matrix XLFD extension.

   `XAffText' is an abbreviation of `X11 affinely transformed text'.  The
   module was inspired by Alan Richardson's xvertext module for displaying
   rotated text strings in X11, using the core X fonts.  It works in a
   similar way.  (It retrieves a bitmap from the X server into an XImage,
   transforms the XImage, monochrome pixel by pixel, and sends it back to a
   bitmap on the server, for use as a stipple.)  But it supports arbitrary
   transformation matrices, and pays extra attention to pixel-level
   accuracy.  It uses integer arithmetic when possible. */

#include <X11/Xlib.h>

#ifdef LIBPLOT
/* Change the names of the two external functions of the module by
   prepending "_x_" to them, for consistency with other internal (but
   externally visible) X11-related functions in libplot.  */
#define XAffDrawAffString _pl_XAffDrawAffString
#define XAffDrawRotString _pl_XAffDrawRotString
#endif

extern int XAffDrawAffString (Display *dpy, Drawable drawable, GC gc, XFontStruct *font, int x, int y, double a[4], const char *text);
extern int XAffDrawRotString (Display *dpy, Drawable drawable, GC gc, XFontStruct *font, int x, int y, double angle, const char *text);