m_transform.c File Reference

#include <config.h>
#include <math.h>
#include <libgeda_priv.h>

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Functions
void	m_transform_combine (TRANSFORM *result, TRANSFORM *a, TRANSFORM *b)
	Combines two transformations.
void	m_transform_init (TRANSFORM *transform)
	Initialize a transform with the identity matrix.
void	m_transform_invert (TRANSFORM *transform, TRANSFORM *inverse)
	Calculates the inverse transform.
void	m_transform_line (TRANSFORM *transform, LINE *line)
	Transforms a line segment.
void	m_transform_lines (TRANSFORM *transform, GArray *lines)
	Transforms multiple line segments.
void	m_transform_point (TRANSFORM *transform, gint *x, gint *y)
	Transforms a point.
void	m_transform_points (TRANSFORM *transform, GArray *points)
	Transforms a polyline or polygon.
void	m_transform_rotate (TRANSFORM *transform, gdouble angle)
	Adds a rotation to the transformation.
void	m_transform_scale (TRANSFORM *transform, gdouble factor)
	Adds a scaling to the transformation.
void	m_transform_translate (TRANSFORM *transform, gdouble dx, gdouble dy)
	Adds a translation to the transformation.

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Function Documentation

void m_transform_combine	(	TRANSFORM *	result,
		TRANSFORM *	a,
		TRANSFORM *	b
	)

Combines two matricies using matrix multiplication: a*b.

Parameters:

result	[out] The resulting transformation. If either operand is NULL, the contents of the result remain unaltered.
a	[in] The second operand.
b	[in] The second operand.

Definition at line 33 of file m_transform.c.

void m_transform_init

(

TRANSFORM *

transform

)

Parameters:

transform

[out] The transform to initialize with the identity matrix.

Definition at line 51 of file m_transform.c.

void m_transform_invert	(	TRANSFORM *	transform,
		TRANSFORM *	inverse
	)

Parameters:

transform	[in] The given matrix
inverse	[out] The inverse of the given matrix.

Definition at line 68 of file m_transform.c.

void m_transform_line	(	TRANSFORM *	transform,
		LINE *	line
	)

Parameters:

transform	[in] The transform function.
line	[inout] The line to transform.

Definition at line 90 of file m_transform.c.

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void m_transform_lines	(	TRANSFORM *	transform,
		GArray *	lines
	)

Parameters:

transform	[in] The transform function.
lines	[inout] The GArray of LINE to transform.

Definition at line 104 of file m_transform.c.

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void m_transform_point	(	TRANSFORM *	transform,
		gint *	x,
		gint *	y
	)

Parameters:

x	[inout] The x coordinate to transform.
y	[inout] The y coordinate to transform.
transform	[in] The transform function.

Definition at line 123 of file m_transform.c.

void m_transform_points	(	TRANSFORM *	transform,
		GArray *	points
	)

Parameters:

transform	[in] The transform function.
points	[inout] The GArray of sPOINT to transform.

Definition at line 144 of file m_transform.c.

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void m_transform_rotate	(	TRANSFORM *	transform,
		gdouble	angle
	)

Parameters:

transform	[inout] The given matrix
angle	[in] The angle to rotate

Definition at line 162 of file m_transform.c.

void m_transform_scale	(	TRANSFORM *	transform,
		gdouble	factor
	)

Parameters:

transform	[inout] The given matrix
factor	[in] The amount to scale the transform. This parameter must not be zero, or the matrix becomes singular.

Definition at line 185 of file m_transform.c.

void m_transform_translate	(	TRANSFORM *	transform,
		gdouble	dx,
		gdouble	dy
	)

Parameters:

transform	[inout] The given matrix.
dx	[in] The amount to translate on the x axis.
dy	[in] The amount to translate on the y axis.

Definition at line 202 of file m_transform.c.