65 lines
2.9 KiB
C
65 lines
2.9 KiB
C
#pragma once
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#ifndef _AFFINE_H_
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#define _AFFINE_H_
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#undef TNZAPI
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#ifdef TNZ_IS_RASTERLIB
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#define TNZAPI TNZ_EXPORT_API
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#else
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#define TNZAPI TNZ_IMPORT_API
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#endif
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typedef struct { /* to be PRE-multiplied with a COLUMN vector, i.e., */
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double a11, a12, a13; /* x = a11*u + a12*v + a13 */
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double a21, a22, a23; /* y = a21*u + a22*v + a23 */
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} AFFINE;
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#define AFF_M_V_1(AFF, V1, V2) ((AFF).a11 * (V1) + (AFF).a12 * (V2) + (AFF).a13)
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#define AFF_M_V_2(AFF, V1, V2) ((AFF).a21 * (V1) + (AFF).a22 * (V2) + (AFF).a23)
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static const AFFINE Aff_I = {1.0, 0.0, 0.0, 0.0, 1.0, 0.0};
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TNZAPI AFFINE aff_shift(double dx, double dy, AFFINE aff);
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TNZAPI AFFINE aff_shift_post(double dx, double dy, AFFINE aff);
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TNZAPI AFFINE aff_rot(double degrees, AFFINE aff);
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TNZAPI AFFINE aff_scale(double sx, double sy, AFFINE aff);
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TNZAPI AFFINE aff_shear(double shx, double shy, AFFINE aff);
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TNZAPI AFFINE aff_place(double u, double v, double x, double y, AFFINE aff);
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TNZAPI AFFINE aff_mult(AFFINE aff1, AFFINE aff2);
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TNZAPI AFFINE aff_inv(AFFINE aff);
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TNZAPI double aff_det(AFFINE aff);
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#define AFF_FILL(AFF, A11, A12, A13, A21, A22, A23) \
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{ \
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(AFF).a11 = A11; \
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(AFF).a12 = A12; \
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(AFF).a13 = A13; \
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(AFF).a21 = A21; \
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(AFF).a22 = A22; \
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(AFF).a23 = A23; \
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}
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#define AFF_EQ(A, B) \
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((A).a11 == (B).a11 && (A).a12 == (B).a12 && (A).a13 == (B).a13 && \
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(A).a21 == (B).a21 && (A).a22 == (B).a22 && (A).a23 == (B).a23)
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#define AFF_NE(A, B) \
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((A).a11 != (B).a11 || (A).a12 != (B).a12 || (A).a13 != (B).a13 || \
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(A).a21 != (B).a21 || (A).a22 != (B).a22 || (A).a23 != (B).a23)
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#define ROTATE(ang, cxin, cyin, cxout, cyout, aff) \
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aff_shift(cxout, cyout, aff_rot(ang, aff_shift(-cxin, -cyin, aff)))
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#define ROTATE_POST(ang, cxin, cyin, cxout, cyout, aff) \
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aff_mult(aff, aff_shift(cxout, cyout, \
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aff_rot(ang, aff_shift(-cxin, -cyin, Aff_I))))
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#define SCALE(sx, sy, cxin, cyin, cxout, cyout, aff) \
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aff_shift(cxout, cyout, aff_scale(sx, sy, aff_shift(-cxin, -cyin, aff)))
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#define SCALE_POST(sx, sy, cxin, cyin, cxout, cyout, aff) \
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aff_mult(aff, aff_shift(cxout, cyout, \
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aff_scale(sx, sy, aff_shift(-cxin, -cyin, Aff_I))))
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#endif
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