mirror of
git://projects.qi-hardware.com/ben-scans.git
synced 2024-11-22 10:20:38 +02:00
898970b3dd
them once. - solidify/matrix.h, solidify/matrix.c: 2D matrix operations - solidify/Makefile (OBJS): added matrix.o - solidify/face.h (struct matrix): moved to solidify/matrix.h - solidify/overlap.c (point, merge_matrix, draw_map): precalculate a single vA+b transformation instead of stepwise transforming the vector inside the loop - solidify/overlap.c (do_shift): now that the math is right (or at least better), reverse the shift
67 lines
1.4 KiB
C
67 lines
1.4 KiB
C
/*
|
|
* matrix.c - 2D matrix operations
|
|
*
|
|
* Written 2010 by Werner Almesberger
|
|
* Copyright 2010 by Werner Almesberger
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
|
|
#include <assert.h>
|
|
|
|
#include "matrix.h"
|
|
|
|
|
|
void matrix_identity(struct matrix *m)
|
|
{
|
|
m->a[0][0] = m->a[1][1] = 1;
|
|
m->a[0][1] = m->a[1][0] = 0;
|
|
m->b[0] = m->b[1] = 0;
|
|
}
|
|
|
|
|
|
void matrix_invert(const double m[2][2], double res[2][2])
|
|
{
|
|
double det = m[0][0]*m[1][1]-m[0][1]*m[1][0];
|
|
|
|
assert(res != (void *) m);
|
|
res[0][0] = m[1][1]/det;
|
|
res[0][1] = -m[0][1]/det;
|
|
res[1][0] = -m[1][0]/det;
|
|
res[1][1] = m[0][0]/det;
|
|
}
|
|
|
|
|
|
void matrix_mult(double a[2][2], double b[2][2], double res[2][2])
|
|
{
|
|
assert(res != a);
|
|
assert(res != b);
|
|
res[0][0] = a[0][0]*b[0][0]+a[0][1]*b[1][0];
|
|
res[0][1] = a[0][0]*b[0][1]+a[0][1]*b[1][1];
|
|
res[1][0] = a[1][0]*b[0][0]+a[1][1]*b[1][0];
|
|
res[1][1] = a[1][0]*b[0][1]+a[1][1]*b[1][1];
|
|
}
|
|
|
|
|
|
void matrix_multv(const double v[2], double m[2][2], double res[2])
|
|
{
|
|
double tmp;
|
|
|
|
tmp = v[0]*m[0][0]+v[1]*m[0][1];
|
|
res[1] = v[0]*m[1][0]+v[1]*m[1][1];
|
|
res[0] = tmp;
|
|
}
|
|
|
|
|
|
void matrix_copy(double from[2][2], double to[2][2])
|
|
{
|
|
to[0][0] = from[0][0];
|
|
to[0][1] = from[0][1];
|
|
to[1][0] = from[1][0];
|
|
to[1][1] = from[1][1];
|
|
}
|