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transform.h

/* $XConsortium: transform.h,v 1.4 94/04/17 20:37:59 gildea Exp $ */
/*

Copyright (c) 1993  X Consortium

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from the X Consortium.

*/


/*
 * header file for transformed coordinate system.  No rotations
 * supported, as elipses cannot be rotated in X.
 */

typedef struct _transform {
      double      mx, bx;
      double      my, by;
} Transform;

typedef struct _TPoint {
      double      x, y;
} TPoint;

typedef struct _TRectangle {
      double      x, y, width, height;
} TRectangle;

# define Xx(x,y,t)      ((int)((t)->mx * (x) + (t)->bx + 0.5))
# define Xy(x,y,t)      ((int)((t)->my * (y) + (t)->by + 0.5))
# define Xwidth(w,h,t)  ((int)((t)->mx * (w) + 0.5))
# define Xheight(w,h,t) ((int)((t)->my * (h) + 0.5))
# define Tx(x,y,t)      ((((double) (x)) - (t)->bx) / (t)->mx)
# define Ty(x,y,t)      ((((double) (y)) - (t)->by) / (t)->my)
# define Twidth(w,h,t)  (((double) (w)) / (t)->mx)
# define Theight(w,h,t) (((double) (h)) / (t)->my)

XPoint *TranslatePoints (TPoint     *points, int n_points, Transform *t, int mode);
void TFillPolygon (Display *dpy, Drawable d, GC gc, Transform *t,
                 TPoint *points, int n_points, int shape, int mode);
void TDrawArc (Display *dpy, Drawable d, GC gc, Transform *t, double x,
             double y, double width, double height, int angle1, int angle2);
void TFillArc (Display *dpy, Drawable d, GC gc, Transform *t, double x,
             double y, double width, double height, int angle1, int angle2);
void SetTransform (Transform *t, int xx1, int xx2, int xy1, int xy2,
               double tx1, double tx2, double ty1, double ty2);

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