| /* File : vector.c */ |
| |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include "vector.h" |
| |
| Vector *createv(double x, double y, double z, double w) { |
| |
| Vector *n; |
| n = (Vector *) malloc(sizeof(Vector)); |
| n->x = x; |
| n->y = y; |
| n->z = z; |
| n->w = w; |
| return n; |
| |
| } |
| |
| /* Destroy vector */ |
| |
| void destroyv(Vector *v) { |
| free(v); |
| } |
| |
| /* Print a vector */ |
| |
| void printv(Vector *v) { |
| |
| printf("x = %g, y = %g, z = %g, w = %g\n", v->x, v->y, v->z, v->w); |
| |
| } |
| |
| /* Do a transformation */ |
| void transform(double **m, Vector *v, Vector *r) { |
| |
| r->x = m[0][0]*v->x + m[0][1]*v->y + m[0][2]*v->z + m[0][3]*v->w; |
| r->y = m[1][0]*v->x + m[1][1]*v->y + m[1][2]*v->z + m[1][3]*v->w; |
| r->z = m[2][0]*v->x + m[2][1]*v->y + m[2][2]*v->z + m[2][3]*v->w; |
| r->w = m[3][0]*v->x + m[3][1]*v->y + m[3][2]*v->z + m[3][3]*v->w; |
| |
| } |
| |
| |
| |
