# 2D Affine Transformsο

2D Transforms uses 2d suffix for naming. If there is no 2D suffix it is 3D function.

## Initialize Transform Matricesο

Functions with _make prefix expect you donβt have a matrix and they create a matrix for you. You donβt need to pass identity matrix.

But other functions expect you have a matrix and you want to transform them. If you didnβt have any existing matrix you have to initialize matrix to identity before sending to transform functions.

## Transforms Orderο

See Transforms Order to read similar section.

Functions:

void glm_translate2d(mat3 m, vec2 v)ο

translate existing 2d transform matrix by v vector and stores result in same matrix

Parameters:
[in, out] m 2d affine transform
[in] v translate vector [x, y]
void glm_translate2d_to(mat3 m, vec2 v, mat3 dest)ο

translate existing 2d transform matrix by v vector and store result in dest

Parameters:
[in] m 2d affine transform
[in] v translate vector [x, y]
[out] dest translated matrix
void glm_translate2d_x(mat3 m, float x)ο

translate existing 2d transform matrix by x factor

Parameters:
[in, out] m 2d affine transform
[in] x x factor
void glm_translate2d_y(mat3 m, float y)ο

translate existing 2d transform matrix by y factor

Parameters:
[in, out] m 2d affine transform
[in] y y factor
void glm_translate2d_make(mat3 m, vec2 v)ο

creates NEW translate 2d transform matrix by v vector

Parameters:
[in, out] m affine transform
[in] v translate vector [x, y]
void glm_scale2d_to(mat3 m, vec2 v, mat3 dest)ο

scale existing 2d transform matrix by v vector and store result in dest

Parameters:
[in] m affine transform
[in] v scale vector [x, y]
[out] dest scaled matrix
void glm_scale2d_make(mat3 m, vec2 v)ο

creates NEW 2d scale matrix by v vector

Parameters:
[in, out] m affine transform
[in] v scale vector [x, y]
void glm_scale2d(mat3 m, vec2 v)ο

scales existing 2d transform matrix by v vector and stores result in same matrix

Parameters:
[in, out] m affine transform
[in] v translate vector [x, y]
void glm_scale2d_uni(mat3 m, float s)ο

applies uniform scale to existing 2d transform matrix v = [s, s] and stores result in same matrix

Parameters:
[in, out] m affine transform
[in] s scale factor
void glm_rotate2d_make(mat3 m, float angle)ο

creates NEW rotation matrix by angle around Z axis

Parameters:
[in, out] m affine transform
void glm_rotate2d(mat3 m, float angle)ο

rotate existing 2d transform matrix around Z axis by angle and store result in same matrix

Parameters:
[in, out] m affine transform