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greg |
2.1 |
/* Copyright (c) 1995 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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double |
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mx3d_adjoint(a, b) |
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register double a[3][3], b[3][3]; |
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{ |
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b[0][0] = ((a[1][1])*( a[2][2]) - ( a[1][2])*( a[2][1])); |
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b[1][0] = ((a[1][2])*( a[2][0]) - ( a[1][0])*( a[2][2])); |
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b[2][0] = ((a[1][0])*( a[2][1]) - ( a[1][1])*( a[2][0])); |
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b[0][1] = ((a[2][1])*( a[0][2]) - ( a[2][2])*( a[0][1])); |
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b[1][1] = ((a[2][2])*( a[0][0]) - ( a[2][0])*( a[0][2])); |
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b[2][1] = ((a[2][0])*( a[0][1]) - ( a[2][1])*( a[0][0])); |
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b[0][2] = ((a[0][1])*( a[1][2]) - ( a[0][2])*( a[1][1])); |
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b[1][2] = ((a[0][2])*( a[1][0]) - ( a[0][0])*( a[1][2])); |
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b[2][2] = ((a[0][0])*( a[1][1]) - ( a[0][1])*( a[1][0])); |
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return a[0][0]*b[0][0] + a[1][0]*b[0][1] + a[2][0]*b[0][2]; |
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} |
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mx3d_mul(a, b, c) |
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register double a[3][3], b[3][3], c[3][3]; |
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{ |
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c[0][0] = a[0][0]*b[0][0] + a[0][1]*b[1][0] + a[0][2]*b[2][0]; |
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c[0][1] = a[0][0]*b[0][1] + a[0][1]*b[1][1] + a[0][2]*b[2][1]; |
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c[0][2] = a[0][0]*b[0][2] + a[0][1]*b[1][2] + a[0][2]*b[2][2]; |
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c[1][0] = a[1][0]*b[0][0] + a[1][1]*b[1][0] + a[1][2]*b[2][0]; |
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c[1][1] = a[1][0]*b[0][1] + a[1][1]*b[1][1] + a[1][2]*b[2][1]; |
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c[1][2] = a[1][0]*b[0][2] + a[1][1]*b[1][2] + a[1][2]*b[2][2]; |
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c[2][0] = a[2][0]*b[0][0] + a[2][1]*b[1][0] + a[2][2]*b[2][0]; |
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c[2][1] = a[2][0]*b[0][1] + a[2][1]*b[1][1] + a[2][2]*b[2][1]; |
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c[2][2] = a[2][0]*b[0][2] + a[2][1]*b[1][2] + a[2][2]*b[2][2]; |
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} |
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mx3d_transform(p, a, q) |
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register double p[3], q[3]; |
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register double a[3][3]; |
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{ |
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q[0] = p[0]*a[0][0] + p[1]*a[1][0] + p[2]*a[2][0]; |
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q[1] = p[0]*a[0][1] + p[1]*a[1][1] + p[2]*a[2][1]; |
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q[2] = p[0]*a[0][2] + p[1]*a[1][2] + p[2]*a[2][2]; |
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} |
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double |
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mx3d_transform_div(p, a, q) |
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register double p[3], q[2]; |
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register double a[3][3]; |
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{ |
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double q2; |
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q2 = p[0]*a[0][2] + p[1]*a[1][2] + p[2]*a[2][2]; |
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if (q2!=0.) { |
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q[0] = (p[0]*a[0][0] + p[1]*a[1][0] + p[2]*a[2][0]) / q2; |
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q[1] = (p[0]*a[0][1] + p[1]*a[1][1] + p[2]*a[2][1]) / q2; |
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} |
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return q2; |
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} |
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mx3d_translate_mat(tx, ty, m) |
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double tx, ty; |
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register double m[3][3]; |
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{ |
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m[0][0] = 1.; m[0][1] = 0.; m[0][2] = 0.; |
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m[1][0] = 0.; m[1][1] = 1.; m[1][2] = 0.; |
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m[2][0] = tx; m[2][1] = ty; m[2][2] = 1.; |
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} |
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mx3d_translate(m, tx, ty) |
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register double m[3][3]; |
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double tx, ty; |
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{ |
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m[3][0] += tx*m[0][0]+ty*m[1][0]; |
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m[3][1] += tx*m[0][1]+ty*m[1][1]; |
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m[3][2] += tx*m[0][2]+ty*m[1][2]; |
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} |
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mx3d_scale_mat(sx, sy, m) |
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double sx, sy; |
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register double m[3][3]; |
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{ |
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m[0][0] = sx; m[0][1] = 0.; m[0][2] = 0.; |
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m[1][0] = 0.; m[1][1] = sy; m[1][2] = 0.; |
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m[2][0] = 0.; m[2][1] = 0.; m[2][2] = 1.; |
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} |
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mx3d_scale(m, sx, sy) |
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register double m[3][3]; |
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double sx, sy; |
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{ |
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m[0][0] *= sx; m[0][1] *= sx; m[0][2] *= sx; |
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m[1][0] *= sy; m[1][1] *= sy; m[1][2] *= sy; |
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} |
