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/*
* header file for transformed coordinate system. No rotations
* supported, as ellipses 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)
extern void Trectangle (const Transform *t, const TRectangle *in, TRectangle *out);
extern void SetTransform (Transform *t,
int xx1, int xx2, int xy1, int xy2,
double tx1, double tx2, double ty1, double ty2);
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