rendering_engine::SceneComponent2D Class Reference

Represents a 2D transformable scene component with position, rotation, and scale. More...

#include <scene_component_2d.hpp>

Public Member Functions
	SceneComponent2D ()
	Constructs a SceneComponent2D at the origin, with zero rotation and unit scale.
virtual	~SceneComponent2D ()=default
	Destructor.
void	SetPosition (const glm::vec2 &position)
	Sets the position in 2D space.
void	SetRotation (float angleDegrees)
	Sets the rotation angle in degrees.
void	SetScale (const glm::vec2 &scale)
	Sets the scale in each dimension.
const glm::vec2 &	GetPosition () const
	Gets the current position.
float	GetRotation () const
	Gets the current rotation angle (in degrees).
const glm::vec2 &	GetScale () const
	Gets the current scale.
const glm::mat4 &	GetModelMatrix () const
	Gets the model matrix for this component.
void	UpdateModelMatrix ()
	Updates the model matrix from the current position, rotation, and scale.

Protected Attributes
glm::vec2	mPosition
float	mRotation
glm::vec2	mScale
glm::mat4	mModelMatrix

Detailed Description

Represents a 2D transformable scene component with position, rotation, and scale.

SceneComponent2D holds position (in 2D), rotation (in degrees, counterclockwise), and scale. It provides methods to set and get each component and maintains the current model matrix.

The engine uses a left-handed coordinate system:

• X+ : Right
• Y+ : Up

The model matrix is updated automatically after any property change, and can be used to transform object-local coordinates into world (scene) coordinates.

Transform order is: scale, then rotate, then translate (S→R→T), matching typical 2D graphics pipelines.

Definition at line 29 of file scene_component_2d.hpp.

Constructor & Destructor Documentation

SceneComponent2D()

rendering_engine::SceneComponent2D::SceneComponent2D

(

)

Constructs a SceneComponent2D at the origin, with zero rotation and unit scale.

Definition at line 8 of file scene_component_2d.cpp.

    :
    mPosition{ 0.0f, 0.0f },
    mRotation{ 0.0f },
    mScale{ 1.0f, 1.0f },
    mModelMatrix{ 1.0f }
{
    UpdateModelMatrix();
}

~SceneComponent2D()

virtual rendering_engine::SceneComponent2D::~SceneComponent2D ( )

virtualdefault

Destructor.

Member Function Documentation

GetModelMatrix()

const glm::mat4 & rendering_engine::SceneComponent2D::GetModelMatrix ( ) const

inline

Gets the model matrix for this component.

Returns

The model matrix as glm::mat4.

Note

Use this to transform object-local coordinates into world (scene) coordinates.

Definition at line 84 of file scene_component_2d.hpp.

{ return mModelMatrix; }

GetPosition()

const glm::vec2 & rendering_engine::SceneComponent2D::GetPosition ( ) const

inline

Gets the current position.

Returns

The position as glm::vec2.

Definition at line 64 of file scene_component_2d.hpp.

{ return mPosition; }

GetRotation()

float rendering_engine::SceneComponent2D::GetRotation ( ) const

inline

Gets the current rotation angle (in degrees).

Returns

The rotation angle (degrees).

Definition at line 70 of file scene_component_2d.hpp.

{ return mRotation; }

GetScale()

const glm::vec2 & rendering_engine::SceneComponent2D::GetScale ( ) const

inline

Gets the current scale.

Returns

The scale as glm::vec2.

Definition at line 76 of file scene_component_2d.hpp.

{ return mScale; }

SetPosition()

void rendering_engine::SceneComponent2D::SetPosition

(

const glm::vec2 &

position

)

Sets the position in 2D space.

Parameters

position

New position as glm::vec2.

Definition at line 18 of file scene_component_2d.cpp.

{
    mPosition = position;
    UpdateModelMatrix();
}

SetRotation()

void rendering_engine::SceneComponent2D::SetRotation

(

float

angleDegrees

)

Sets the rotation angle in degrees.

Parameters

angleDegrees

Angle in degrees (counterclockwise).

Definition at line 24 of file scene_component_2d.cpp.

{
    mRotation = angleDegrees;
    UpdateModelMatrix();
}

SetScale()

void rendering_engine::SceneComponent2D::SetScale

(

const glm::vec2 &

scale

)

Sets the scale in each dimension.

Parameters

scale

New scale as glm::vec2.

Definition at line 30 of file scene_component_2d.cpp.

{
    mScale = scale;
    UpdateModelMatrix();
}

UpdateModelMatrix()

void rendering_engine::SceneComponent2D::UpdateModelMatrix

(

)

Updates the model matrix from the current position, rotation, and scale.

Called automatically after property changes, but can be called manually if needed.

See also

SetPosition(), SetRotation(), SetScale()

Definition at line 36 of file scene_component_2d.cpp.

{
    const float r = glm::radians(mRotation);
 
    const glm::mat4 S = glm::scale(glm::mat4(1.0f), glm::vec3(mScale, 1.0f));
    const glm::mat4 R = glm::rotate(glm::mat4(1.0f), r, glm::vec3(0.0f, 0.0f, 1.0f));
    const glm::mat4 T = glm::translate(glm::mat4(1.0f), glm::vec3(mPosition, 0.0f));
 
    mModelMatrix = T * R * S;
}

Member Data Documentation

mModelMatrix

glm::mat4 rendering_engine::SceneComponent2D::mModelMatrix

protected

Definition at line 98 of file scene_component_2d.hpp.

mPosition

glm::vec2 rendering_engine::SceneComponent2D::mPosition

protected

Definition at line 94 of file scene_component_2d.hpp.

mRotation

float rendering_engine::SceneComponent2D::mRotation

protected

Definition at line 95 of file scene_component_2d.hpp.

mScale

glm::vec2 rendering_engine::SceneComponent2D::mScale

protected

Definition at line 96 of file scene_component_2d.hpp.

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The documentation for this class was generated from the following files:

• scene_component_2d.hpp
• scene_component_2d.cpp