GRASS GIS 8 Programmer's Manual
8.5.0dev(2024)-57a646b4a4
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GIS Library - rotate. More...
#include <math.h>
Go to the source code of this file.
Macros | |
#define | RpD ((2 * M_PI) / 360.) /* radians/degree */ |
#define | D2R(d) (double)(d * RpD) /* degrees->radians */ |
#define | R2D(d) (double)(d / RpD) /* radians->degrees */ |
Functions | |
void | G_rotate_around_point (double X0, double Y0, double *X1, double *Y1, double angle) |
Rotate point (double version) More... | |
void | G_rotate_around_point_int (int X0, int Y0, int *X1, int *Y1, double angle) |
Rotate point (int version) More... | |
GIS Library - rotate.
(C) 2001-2014 by the GRASS Development Team
This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.
Definition in file rotate.c.
void G_rotate_around_point | ( | double | X0, |
double | Y0, | ||
double * | X1, | ||
double * | Y1, | ||
double | angle | ||
) |
Rotate point (double version)
Given a point, angle, and origin, rotate the point around the origin by the given angle. Coordinates and results are double prec floating point.
X0 | X component of origin (center of circle) | |
Y0 | Y component of origin (center of circle) | |
[out] | X1 | X component of point to be rotated (variable is modified!) |
[out] | Y1 | Y component of point to be rotated (variable is modified!) |
angle | in degrees, measured CCW from east |
Definition at line 33 of file rotate.c.
Referenced by G_rotate_around_point_int().
void G_rotate_around_point_int | ( | int | X0, |
int | Y0, | ||
int * | X1, | ||
int * | Y1, | ||
double | angle | ||
) |
Rotate point (int version)
Given a point, angle, and origin, rotate the point around the origin by the given angle. Coordinates are given in integer and results are rounded back to integer.
X0 | X component of origin (center of circle) | |
Y0 | Y component of origin (center of circle) | |
[out] | X1 | X component of point to be rotated (variable is modified!) |
[out] | Y1 | Y component of point to be rotated (variable is modified!) |
angle | in degrees, measured CCW from east |
Definition at line 60 of file rotate.c.
References G_rotate_around_point(), and x.