e_intersect.c File Reference
#include <stdlib.h>#include <math.h>#include <grass/gis.h>#include "e_intersect.h"
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Defines | |
| #define | SWAP(a, b) {t = a; a = b; b = t;} |
| #define | MIN(X, Y) ((X<Y)?X:Y) |
| #define | MAX(X, Y) ((X>Y)?X:Y) |
| #define | D (ax2-ax1)*(by1-by2) - (ay2-ay1)*(bx1-bx2) |
| #define | DA (bx1-ax1)*(by1-by2) - (by1-ay1)*(bx1-bx2) |
| #define | DB (ax2-ax1)*(by1-ay1) - (ay2-ay1)*(bx1-ax1) |
| #define | N 52 |
Functions | |
| int | segment_intersection_2d_tol (double ax1, double ay1, double ax2, double ay2, double bx1, double by1, double bx2, double by2, double *x1, double *y1, double *x2, double *y2, double tol) |
| int | segment_intersection_2d (double ax1, double ay1, double ax2, double ay2, double bx1, double by1, double bx2, double by2, double *x1, double *y1, double *x2, double *y2) |
| int | almost_equal (double a, double b, int bits) |
Define Documentation
| #define D (ax2-ax1)*(by1-by2) - (ay2-ay1)*(bx1-bx2) |
Definition at line 13 of file e_intersect.c.
| #define DA (bx1-ax1)*(by1-by2) - (by1-ay1)*(bx1-bx2) |
| #define DB (ax2-ax1)*(by1-ay1) - (ay2-ay1)*(bx1-ax1) |
| #define MAX | ( | X, | |||
| Y | ) | ((X>Y)?X:Y) |
Definition at line 11 of file e_intersect.c.
| #define MIN | ( | X, | |||
| Y | ) | ((X<Y)?X:Y) |
Definition at line 8 of file e_intersect.c.
| #define N 52 |
Definition at line 910 of file e_intersect.c.
| #define SWAP | ( | a, | |||
| b | ) | {t = a; a = b; b = t;} |
Function Documentation
| int almost_equal | ( | double | a, | |
| double | b, | |||
| int | bits | |||
| ) |
| int segment_intersection_2d | ( | double | ax1, | |
| double | ay1, | |||
| double | ax2, | |||
| double | ay2, | |||
| double | bx1, | |||
| double | by1, | |||
| double | bx2, | |||
| double | by2, | |||
| double * | x1, | |||
| double * | y1, | |||
| double * | x2, | |||
| double * | y2 | |||
| ) |
Definition at line 677 of file e_intersect.c.
References D, DA, DB, MAX, MIN, and SWAP.
Referenced by find_all_intersections().
| int segment_intersection_2d_tol | ( | double | ax1, | |
| double | ay1, | |||
| double | ax2, | |||
| double | ay2, | |||
| double | bx1, | |||
| double | by1, | |||
| double | bx2, | |||
| double | by2, | |||
| double * | x1, | |||
| double * | y1, | |||
| double * | x2, | |||
| double * | y2, | |||
| double | tol | |||
| ) |
