Matrix2D Interface Reference

import"evg.idl";

Public Member Functions
	Matrix2D ()
	Matrix2D (Matrix2D from)
	Matrix2D (double coefs...)
Point2D	get_scale ()
Point2D	get_translate ()
double	get_rotate ()
Matrix2D	inverse ()
Matrix2D	copy ()
void	copy (Matrix2D from)
Matrix2D	add (Matrix2D mx, optional boolean premultiply=false)
Matrix2D	translate (double x, double y)
Matrix2D	translate (Point2D vec)
Matrix2D	rotate (double cx, double cy, double a)
Matrix2D	scale (double sx, double sy)
Matrix2D	scale (double sx, double sy, double cx, double cy, double angle)
Matrix2D	skew (double skew_x, double skew_y)
Matrix2D	skew_x (double skew)
Matrix2D	skew_y (double skew)
Point2D	apply (Point2D in)
Rect	apply (Rect in)

Data Fields
attribute double	xx
attribute double	xy
attribute double	tx
attribute double	yx
attribute double	yy
attribute boolean	identity
attribute const boolean	is3D = false

Detailed Description

2D matrix, see GF_Matrix2D the transformation of (x, y) into (x', y') is:

x' = x * m.xx + y * m.xy + m.tx;
y' = x * m.yx + y * m.yy + m.ty;

Most matrix functions return the path object itself, so that the operations can be chained:

mx.rotate(0).translate(10, 20).scale(2, 2);

All objects (Point2D, Rect) used in the API do not use constructors, their type is inferred if the expected attributes (eg x y, ...) are present in the object

let res = max.apply({x:0,y: 0});
print(`transformed ${res.x} ${res.y});`

Constructor & Destructor Documentation

Matrix2D() [1/3]

Matrix2D::Matrix2D

(

)

constructor

Matrix2D() [2/3]

Matrix2D::Matrix2D

(

Matrix2D

from

)

constructor

Parameters

from	the color matrix to use

Matrix2D() [3/3]

Matrix2D::Matrix2D

(

double

coefs...

)

constructor

Parameters

coefs

the matrix coeficients

Member Function Documentation

get_scale()

Point2D Matrix2D::get_scale

(

)

get scale part of the matrix after decomposition - see gf_mx2d_decompose

Returns

{x, y} object, or null if matrix cannot be decomposed

get_translate()

Point2D Matrix2D::get_translate

(

)

get translate part of the matrix after decomposition - see gf_mx2d_decompose

Returns

{x, y} object, or null if matrix cannot be decomposed

get_rotate()

double Matrix2D::get_rotate

(

)

get rotation part of the matrix after decomposition - see gf_mx2d_decompose

Returns

rotation, or null if matrix cannot be decomposed

inverse()

Matrix2D Matrix2D::inverse

(

)

inverse matrix - see gf_mx2d_inverse

Returns

the matrix

copy() [1/2]

Matrix2D Matrix2D::copy

(

)

copies the matrix

Returns

the new copy matrix

copy() [2/2]

void Matrix2D::copy

(

Matrix2D

from

)

copies from a matrix

Parameters

from	the matrix to copy from

add()

Matrix2D Matrix2D::add	(	Matrix2D	mx,
		optional boolean	premultiply = false
	)

adds a matrix - see gf_mx2d_add_matrix and gf_mx2d_pre_multiply

Parameters

mx	the matrix to multiply
premultiply	if true, performs mx * this , otherwise this * mx

Returns

the matrix

translate() [1/2]

Matrix2D Matrix2D::translate	(	double	x,
		double	y
	)

add a translation - see gf_mx2d_add_translation

Parameters

x	horizontal translation
y	vertical translation

Returns

the matrix

translate() [2/2]

Matrix2D Matrix2D::translate

(

Point2D

vec

)

add a translation - see gf_mx2d_add_translation

Parameters

vec	translation vector

Returns

the matrix

rotate()

Matrix2D Matrix2D::rotate	(	double	cx,
		double	cy,
		double	a
	)

add a rotation - see gf_mx2d_add_rotation

Parameters

cx	center x coordinate
cy	center y coordinate
a	rotation angle

Returns

the matrix

scale() [1/2]

Matrix2D Matrix2D::scale	(	double	sx,
		double	sy
	)

adds scale - see gf_mx2d_add_scale

Parameters

sx	horizontal scale factor
sy	vertical scale factor

Returns

the matrix

scale() [2/2]

Matrix2D Matrix2D::scale	(	double	sx,
		double	sy,
		double	cx,
		double	cy,
		double	angle
	)

adds scale - see gf_mx2d_add_scale_at

Parameters

sx	horizontal scale factor
sy	vertical scale factor
cx	horizontal scaling center coordinate
cy	vertical scaling center coordinate
angle	scale orienttion angle in radians

Returns

the matrix

skew()

Matrix2D Matrix2D::skew	(	double	skew_x,
		double	skew_y
	)

adds skew - see gf_mx2d_add_skew

Parameters

skew_x	horizontal skew factor
skew_y	vertical skew factor

Returns

the matrix

skew_x()

Matrix2D Matrix2D::skew_x

(

double

skew

)

adds horizontal skew - see gf_mx2d_add_skew_x

Parameters

skew	horizontal skew factor

Returns

the matrix

skew_y()

Matrix2D Matrix2D::skew_y

(

double

skew

)

adds vertical skew - see gf_mx2d_add_skew_y

Parameters

skew	vertical skew factor

Returns

the matrix

apply() [1/2]

Point2D Matrix2D::apply

(

Point2D

in

)

transforms a point with a matrix - see gf_mx2d_apply_point

Parameters

in	input point to transform

Returns

the transformed point

apply() [2/2]

Rect Matrix2D::apply

(

Rect

in

)

transforms a rectangle with a matrix - see gf_mx2d_apply_rect

Parameters

in	input rectangle to transform

Returns

the transformed rectangle

Field Documentation

xx

attribute double Matrix2D::xx

xx

xy

attribute double Matrix2D::xy

xy

tx

attribute double Matrix2D::tx

tx

ty

yx

attribute double Matrix2D::yx

yx

yy

attribute double Matrix2D::yy

yy

identity

attribute boolean Matrix2D::identity

matrix is identity

is3D

attribute const boolean Matrix2D::is3D = false

indicates matrix is a 2D matrix