EggTransform

from acron.egg import EggTransform

class EggTransform

Bases:

Bases: MemoryBase

This represents the <Transform> entry of a group or texture node: a list of component transform operations, applied in order, that describe a net transform matrix.

This may be either a 3-d transform, and therefore described by a 4x4 matrix, or a 2-d transform, described by a 3x3 matrix.

Inheritance diagram

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enum ComponentType

enumerator CT_invalid = 0

enumerator CT_translate2d = 1

enumerator CT_translate3d = 2

enumerator CT_rotate2d = 3

enumerator CT_rotx = 4

enumerator CT_roty = 5

enumerator CT_rotz = 6

enumerator CT_rotate3d = 7

enumerator CT_scale2d = 8

enumerator CT_scale3d = 9

enumerator CT_uniform_scale = 10

enumerator CT_matrix3 = 11

enumerator CT_matrix4 = 12

__init__()

add_matrix3()

Appends an arbitrary 3x3 matrix to the current transform.

add_matrix4()

Appends an arbitrary 4x4 matrix to the current transform.

add_rotate2d()

Appends a 2-d rotation to the current transform. The rotation angle is specified in degrees counterclockwise about the origin.

add_rotate3d()

Appends a 3-d rotation about an arbitrary axis to the current transform. The rotation angle is specified in degrees counterclockwise about the axis.

Appends an arbitrary 3-d rotation to the current transform, expressed as a quaternion. This is converted to axis-angle notation for the egg file.

add_rotx()

Appends a rotation about the X axis to the current transform. The rotation angle is specified in degrees counterclockwise about the axis.

add_roty()

Appends a rotation about the Y axis to the current transform. The rotation angle is specified in degrees counterclockwise about the axis.

add_rotz()

Appends a rotation about the Z axis to the current transform. The rotation angle is specified in degrees counterclockwise about the axis.

add_scale2d()

Appends a possibly non-uniform scale to the current transform.

add_scale3d()

Appends a possibly non-uniform scale to the current transform.

add_translate2d()

Appends a 2-d translation operation to the current transform.

add_translate3d()

Appends a 3-d translation operation to the current transform.

add_uniform_scale()

Appends a uniform scale to the current transform.

assign()

clear_transform()

Resets the transform to empty, identity.

get_component_mat3()

Returns the 3x3 matrix associated with the nth component. It is an error to call this if the component type is not CT_matrix3.

get_component_mat4()

Returns the 4x4 matrix associated with the nth component. It is an error to call this if the component type is not CT_matrix4.

get_component_number()

Returns the solitary number associated with the nth component. In the case of a rotation, this is the angle in degrees to rotate; in the case of uniform scale, this is the amount of the scale. Other types do not use this property.

get_component_type()

Returns the type of the nth component.

get_component_vec2()

Returns the 2-component vector associated with the nth component. This may be the translate vector, rotate axis, or non-uniform scale. It is an error to call this if the component type does not use a 2-d vector property.

get_component_vec3()

Returns the 3-component vector associated with the nth component. This may be the translate vector, rotate axis, or non-uniform scale. It is an error to call this if the component type does not use a 3-d vector property.

get_num_components()

Returns the number of components that make up the transform.

get_transform2d()

Returns the overall transform as a 3x3 matrix. It is an error to call this if has_transform3d() is true.

get_transform3d()

Returns the overall transform as a 4x4 matrix. It is valid to call this even if has_transform2d() is true; in this case, the 3x3 transform will be expanded to a 4x4 matrix.

has_transform()

Returns true if the transform is nonempty, false if it is empty (no transform components have been added). This is true for either a 2-d or a 3-d transform.

has_transform2d()

Returns true if the transform is specified as a 2-d transform, e.g. with a 3x3 matrix, or false if it is specified as a 3-d transform (with a 4x4 matrix), or not specified at all.

Normally, EggTextures have a 2-d matrix (but occasionally they use a 3-d matrix), and EggGroups always have a 3-d matrix.

has_transform3d()

Returns true if the transform is specified as a 3-d transform, e.g. with a 4x4 matrix, or false if it is specified as a 2-d transform (with a 2x2 matrix), or not specified at all.

Normally, EggTextures have a 3-d matrix (but occasionally they use a 3-d matrix), and EggGroups always have a 3-d matrix.

set_transform2d()

Sets the overall transform as a 3x3 matrix. This completely replaces whatever componentwise transform may have been defined.

set_transform3d()

Sets the overall transform as a 4x4 matrix. This completely replaces whatever componentwise transform may have been defined.

transform_is_identity()

Returns true if the described transform is identity, false otherwise.

write()

Writes the transform to the indicated stream in Egg format.