MyPaintTransform Struct Reference

3x3 matrix of floats, row-major order. More...

#include <mypaint-matrix.h>

Public Member Functions
MyPaintTransform	mypaint_transform_unit ()
	3x3 unit matrix More...
MyPaintTransform	mypaint_transform_rotate_cw (const MyPaintTransform transform, const float angle_radians)
	Create a new transform by rotating the input transform clockwise. More...
MyPaintTransform	mypaint_transform_rotate_ccw (const MyPaintTransform transform, const float angle_radians)
	Create a new transform by rotating the input transform counterclockwise. More...
MyPaintTransform	mypaint_transform_reflect (const MyPaintTransform transform, const float angle_radians)
	Create a new transform by reflecting the input transform across a line crossing 0,0. More...
MyPaintTransform	mypaint_transform_translate (const MyPaintTransform transform, const float x, const float y)
	Create a new transform by reflecting the input transform across a line crossing 0,0. More...
void	mypaint_transform_point (const MyPaintTransform *const transform, float x, float y, float *x_out, float *y_out)
	Apply transformation to a (x, y) point, writing the resulting coordinates to out parameters. More...

Data Fields
float	rows [3][3]

Detailed Description

3x3 matrix of floats, row-major order.

Only used in MyPaintTiledSurface2 for symmetry calculations, not required for any calls to public functions.

The containing header should probably not have been made public.

Member Function Documentation

mypaint_transform_point()

void mypaint_transform_point	(	const MyPaintTransform *const	transform,
		float	x,
		float	y,
		float *	x_out,
		float *	y_out
	)

Apply transformation to a (x, y) point, writing the resulting coordinates to out parameters.

Parameters

	transform	Transform to apply
	x	x coordinate to transform
	y	y coordinate to transform
[out]	x_out	pointer to x coordinate of the transformed point
[out]	y_out	pointer to y coordinate of the transformed point

mypaint_transform_reflect()

MyPaintTransform mypaint_transform_reflect	(	const MyPaintTransform	transform,
		const float	angle_radians
	)

Create a new transform by reflecting the input transform across a line crossing 0,0.

Parameters

transform	input transform
angle_radians	the angle of the line to reflect across, in radians

Returns

the resulting transformation matrix

mypaint_transform_rotate_ccw()

MyPaintTransform mypaint_transform_rotate_ccw	(	const MyPaintTransform	transform,
		const float	angle_radians
	)

Create a new transform by rotating the input transform counterclockwise.

Parameters

transform	input transform
angle_radians	The amount of rotation to apply, in radians.

Returns

the resulting transformation matrix

mypaint_transform_rotate_cw()

MyPaintTransform mypaint_transform_rotate_cw	(	const MyPaintTransform	transform,
		const float	angle_radians
	)

Create a new transform by rotating the input transform clockwise.

Parameters

transform	input transform
angle_radians	The amount of rotation to apply, in radians.

Returns

a 3x3 unit matrix

mypaint_transform_translate()

MyPaintTransform mypaint_transform_translate	(	const MyPaintTransform	transform,
		const float	x,
		const float	y
	)

Create a new transform by reflecting the input transform across a line crossing 0,0.

Parameters

transform	Input transform
x,y	The translation to apply

Returns

the resulting transformation matrix

mypaint_transform_unit()

MyPaintTransform mypaint_transform_unit

(

)

3x3 unit matrix

1 0 0
0 1 0
0 0 1

Field Documentation

rows

float MyPaintTransform::rows[3][3]

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The documentation for this struct was generated from the following file:

• mypaint-matrix.h