32 lines
1018 B
C
32 lines
1018 B
C
/*
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* header file for transformed coordinate system. No rotations
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* supported, as elipses cannot be rotated in X.
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*/
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typedef struct _transform {
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double mx, bx;
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double my, by;
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} Transform;
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typedef struct _TPoint {
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double x, y;
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} TPoint;
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typedef struct _TRectangle {
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double x, y, width, height;
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} TRectangle;
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# define Xx(x,y,t) ((int)((t)->mx * (x) + (t)->bx + 0.5))
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# define Xy(x,y,t) ((int)((t)->my * (y) + (t)->by + 0.5))
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# define Xwidth(w,h,t) ((int)((t)->mx * (w) + 0.5))
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# define Xheight(w,h,t) ((int)((t)->my * (h) + 0.5))
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# define Tx(x,y,t) ((((double) (x)) - (t)->bx) / (t)->mx)
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# define Ty(x,y,t) ((((double) (y)) - (t)->by) / (t)->my)
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# define Twidth(w,h,t) (((double) (w)) / (t)->mx)
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# define Theight(w,h,t) (((double) (h)) / (t)->my)
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extern void Trectangle (const Transform *t, const TRectangle *in, TRectangle *out);
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extern void SetTransform (Transform *t,
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int xx1, int xx2, int xy1, int xy2,
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double tx1, double tx2, double ty1, double ty2);
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