geometry.h File Reference

(c9e89e9 on 26 Jul 2017)

#include "types.h"

Include dependency graph for geometry.h:

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Classes
struct	_Path
struct	_Transform

Typedefs
typedef struct _Path	Path
typedef struct _Transform	Transform

Functions
int	path_alloc (Path **ppath, u32 npts)
	Allocates a path with room for a given number of points. More...
void	path_map (Path *path, const Transform *mx)
	Transforms all the points in a path according to the given matrix. More...
bool	path_unmap (Path *path, const Transform *mx)
	Transforms all the points in a path according to the inverse of the given matrix. More...
void	matrix_clear (Transform *matrix)
	Resets the matrix to the identity matrix. More...
void	matrix_translate (Transform *matrix, double dx, double dy)
	Translates the matrix by a given amount. More...
void	matrix_rotate (Transform *matrix, double angle)
	Rotates the matrix counterclockwise around the origin by the given angle, in degrees. More...
void	matrix_rotate_point (Transform *matrix, double x, double y, double angle)
	Rotates the matrix counterclockwise around the given point by the given angle, in degrees. More...
void	matrix_scale (Transform *matrix, double sx, double sy)
	Scales the matrix by the given amount on each axis. More...
void	matrix_map (const Transform *matrix, const double *pts, double *opts, int count)
	Maps a contiguous set of points from one array to another. More...
bool	matrix_unmap (const Transform *matrix, const double *pts, double *opts, int count)
	Maps a contiguous set of points from one array to another, using the inverse of the provided matrix. More...
bool	matrix_invert (Transform *dest, const Transform *src)
	Replaces the destination matrix with the inverse of the source matrix. More...
void	matrix_dump (const Transform *mx)

Typedef Documentation

Path

typedef struct _Path Path

Transform

typedef struct _Transform Transform

Function Documentation

matrix_clear()

void matrix_clear

(

Transform *

matrix

)

Resets the matrix to the identity matrix.

matrix_dump()

void matrix_dump

(

const Transform *

mx

)

matrix_invert()

bool matrix_invert	(	Transform *	dest,
		const Transform *	src
	)

Replaces the destination matrix with the inverse of the source matrix.

Returns TRUE if successful, FALSE if the inversion failed because the source transform is singular.

matrix_map()

void matrix_map	(	const Transform *	matrix,
		const double *	pts,
		double *	opts,
		int	count
	)

Maps a contiguous set of points from one array to another.

The output array may overlap, or be the same, as the input array.

matrix_rotate()

void matrix_rotate	(	Transform *	matrix,
		double	angle
	)

Rotates the matrix counterclockwise around the origin by the given angle, in degrees.

matrix_rotate_point()

void matrix_rotate_point	(	Transform *	matrix,
		double	x,
		double	y,
		double	angle
	)

Rotates the matrix counterclockwise around the given point by the given angle, in degrees.

matrix_scale()

void matrix_scale	(	Transform *	matrix,
		double	sx,
		double	sy
	)

Scales the matrix by the given amount on each axis.

matrix_translate()

void matrix_translate	(	Transform *	matrix,
		double	dx,
		double	dy
	)

Translates the matrix by a given amount.

matrix_unmap()

bool matrix_unmap	(	const Transform *	matrix,
		const double *	pts,
		double *	opts,
		int	count
	)

Maps a contiguous set of points from one array to another, using the inverse of the provided matrix.

The output array may overlap, or be the same, as the input array. If the matrix is singular, FALSE is returned and no points are changed; otherwise all points will be mapped and TRUE is returned.

path_alloc()

int path_alloc	(	Path **	ppath,
		u32	npts
	)

Allocates a path with room for a given number of points.

The first parameter can be non-null for a preallocated Path structure, or nullptr to create a new structure on the heap.

path_map()

void path_map	(	Path *	path,
		const Transform *	mx
	)

Transforms all the points in a path according to the given matrix.

path_unmap()

bool path_unmap	(	Path *	path,
		const Transform *	mx
	)

Transforms all the points in a path according to the inverse of the given matrix.

Returns TRUE if the path was mapped, FALSE if the mapping failed due to a noninvertible matrix.