GRASS GIS 8 Programmer's Manual  8.5.0dev(2024)-cf81aadc39
Macros | Functions
gis/intersect.c File Reference

Go to the source code of this file.

Macros

#define D   ((ax2 - ax1) * (by1 - by2) - (ay2 - ay1) * (bx1 - bx2))
 
#define D1   ((bx1 - ax1) * (by1 - by2) - (by1 - ay1) * (bx1 - bx2))
 
#define D2   ((ax2 - ax1) * (by1 - ay1) - (ay2 - ay1) * (bx1 - ax1))
 
#define SWAP(x, y)
 

Functions

int G_intersect_line_segments (double ax1, double ay1, double ax2, double ay2, double bx1, double by1, double bx2, double by2, double *ra, double *rb, double *x, double *y)
 

Macro Definition Documentation

◆ D

#define D   ((ax2 - ax1) * (by1 - by2) - (ay2 - ay1) * (bx1 - bx2))

Definition at line 72 of file gis/intersect.c.

◆ D1

#define D1   ((bx1 - ax1) * (by1 - by2) - (by1 - ay1) * (bx1 - bx2))

Definition at line 73 of file gis/intersect.c.

◆ D2

#define D2   ((ax2 - ax1) * (by1 - ay1) - (ay2 - ay1) * (bx1 - ax1))

Definition at line 74 of file gis/intersect.c.

◆ SWAP

#define SWAP (   x,
  y 
)
Value:
{ \
double t; \
t = x; \
x = y; \
y = t; \
}
t
double t
Definition: r_raster.c:39
x
#define x

Definition at line 76 of file gis/intersect.c.

Function Documentation

◆ G_intersect_line_segments()

int G_intersect_line_segments ( double  ax1,
double  ay1,
double  ax2,
double  ay2,
double  bx1,
double  by1,
double  bx2,
double  by2,
double *  ra,
double *  rb,
double *  x,
double *  y 
)

Definition at line 84 of file gis/intersect.c.

Referenced by G_distance_between_line_segments().