1/*
2 * header file for transformed coordinate system.  No rotations
3 * supported, as ellipses cannot be rotated in X.
4 */
5
6typedef struct _transform {
7	double	mx, bx;
8	double	my, by;
9} Transform;
10
11typedef struct _TPoint {
12	double	x, y;
13} TPoint;
14
15typedef struct _TRectangle {
16	double	x, y, width, height;
17} TRectangle;
18
19# define Xx(x,y,t)	((int)((t)->mx * (x) + (t)->bx + 0.5))
20# define Xy(x,y,t)	((int)((t)->my * (y) + (t)->by + 0.5))
21# define Xwidth(w,h,t)	((int)((t)->mx * (w) + 0.5))
22# define Xheight(w,h,t)	((int)((t)->my * (h) + 0.5))
23# define Tx(x,y,t)	((((double) (x)) - (t)->bx) / (t)->mx)
24# define Ty(x,y,t)	((((double) (y)) - (t)->by) / (t)->my)
25# define Twidth(w,h,t)	(((double) (w)) / (t)->mx)
26# define Theight(w,h,t)	(((double) (h)) / (t)->my)
27
28extern void Trectangle (const Transform *t, const TRectangle *in, TRectangle *out);
29extern void SetTransform (Transform *t,
30                          int xx1, int xx2, int xy1, int xy2,
31                          double tx1, double tx2, double ty1, double ty2);
32