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remove.

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Bertram Felgenhauer 2005-08-22 16:52:40 +00:00
parent 9883104290
commit 23baafbaa8
3 changed files with 5 additions and 35 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2005-08-22 Bertram Felgenhauer <int-e@gmx.de>
* src/cairoint.h, src/cairo-matrix.c
(_cairo_matrix_compute_eigen_values): remove.
2005-08-22 Bertram Felgenhauer <int-e@gmx.de>
* src/cairo-arc.c (_arc_segments_needed): correct the calculation of

31
src/cairo-matrix.c
View file

@ -484,37 +484,6 @@ _cairo_matrix_compute_determinant (const cairo_matrix_t *matrix,
*det = a*d - b*c;
}
void
_cairo_matrix_compute_eigen_values (const cairo_matrix_t *matrix,
double *lambda1, double *lambda2)
{
/* The eigenvalues of an NxN matrix M are found by solving the polynomial:
det (M - lI) = 0
The zeros in our homogeneous 3x3 matrix make this equation equal
to that formed by the sub-matrix:
M = a b
c d
by which:
l^2 - (a+d)l + (ad - bc) = 0
l = (a+d +/- sqrt (a^2 + 2ad + d^2 - 4 (ad-bc))) / 2;
*/
double a, b, c, d, rad;
a = matrix->xx; b = matrix->yx;
c = matrix->xy; d = matrix->yy;
rad = sqrt (a*a + 2*a*d + d*d - 4*(a*d - b*c));
*lambda1 = (a + d + rad) / 2.0;
*lambda2 = (a + d - rad) / 2.0;
}
/* Compute the amount that each basis vector is scaled by. */
cairo_status_t
_cairo_matrix_compute_scale_factors (const cairo_matrix_t *matrix,

4
src/cairoint.h
View file

@ -1854,10 +1854,6 @@ _cairo_matrix_transform_bounding_box (const cairo_matrix_t *matrix,
cairo_private void
_cairo_matrix_compute_determinant (const cairo_matrix_t *matrix, double *det);
cairo_private void
_cairo_matrix_compute_eigen_values (const cairo_matrix_t *matrix,
double *lambda1, double *lambda2);
cairo_private cairo_status_t
_cairo_matrix_compute_scale_factors (const cairo_matrix_t *matrix,
double *sx, double *sy, int x_major);