SFML/src/SFML/Graphics/Transformable.cpp at master · githubhy/SFML · GitHub

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////////////////////////////////////////////////////////////

// SFML - Simple and Fast Multimedia Library

// This software is provided 'as-is', without any express or implied warranty.

// In no event will the authors be held liable for any damages arising from the use of this software.

// Permission is granted to anyone to use this software for any purpose,

// including commercial applications, and to alter it and redistribute it freely,

// subject to the following restrictions:

// 1. The origin of this software must not be misrepresented;

// you must not claim that you wrote the original software.

// If you use this software in a product, an acknowledgment

// in the product documentation would be appreciated but is not required.

// 2. Altered source versions must be plainly marked as such,

// and must not be misrepresented as being the original software.

// 3. This notice may not be removed or altered from any source distribution.

////////////////////////////////////////////////////////////

// Headers

////////////////////////////////////////////////////////////

#include <SFML/Graphics/Transformable.hpp>

#include <cmath>

namespace sf

{

////////////////////////////////////////////////////////////

void Transformable::setPosition(const Vector2f& position)

{

m_position = position;

m_transformNeedUpdate = true;

m_inverseTransformNeedUpdate = true;

}

////////////////////////////////////////////////////////////

void Transformable::setRotation(Angle angle)

{

m_rotation = angle.wrapUnsigned();

m_transformNeedUpdate = true;

m_inverseTransformNeedUpdate = true;

}

////////////////////////////////////////////////////////////

void Transformable::setScale(const Vector2f& factors)

{

m_scale = factors;

m_transformNeedUpdate = true;

m_inverseTransformNeedUpdate = true;

}

////////////////////////////////////////////////////////////

void Transformable::setOrigin(const Vector2f& origin)

{

m_origin = origin;

m_transformNeedUpdate = true;

m_inverseTransformNeedUpdate = true;

}

////////////////////////////////////////////////////////////

const Vector2f& Transformable::getPosition() const

{

return m_position;

}

////////////////////////////////////////////////////////////

Angle Transformable::getRotation() const

{

return m_rotation;

}

////////////////////////////////////////////////////////////

const Vector2f& Transformable::getScale() const

{

return m_scale;

}

////////////////////////////////////////////////////////////

const Vector2f& Transformable::getOrigin() const

{

return m_origin;

}

////////////////////////////////////////////////////////////

void Transformable::move(const Vector2f& offset)

{

setPosition(m_position + offset);

}

////////////////////////////////////////////////////////////

void Transformable::rotate(Angle angle)

{

setRotation(m_rotation + angle);

}

////////////////////////////////////////////////////////////

void Transformable::scale(const Vector2f& factor)

{

setScale({m_scale.x * factor.x, m_scale.y * factor.y});

}

////////////////////////////////////////////////////////////

const Transform& Transformable::getTransform() const

{

// Recompute the combined transform if needed

if (m_transformNeedUpdate)

{

const float angle = -m_rotation.asRadians();

const float cosine = std::cos(angle);

const float sine = std::sin(angle);

const float sxc = m_scale.x * cosine;

const float syc = m_scale.y * cosine;

const float sxs = m_scale.x * sine;

const float sys = m_scale.y * sine;

const float tx = -m_origin.x * sxc - m_origin.y * sys + m_position.x;

const float ty = m_origin.x * sxs - m_origin.y * syc + m_position.y;

// clang-format off

m_transform = Transform( sxc, sys, tx,

-sxs, syc, ty,

0.f, 0.f, 1.f);

// clang-format on

m_transformNeedUpdate = false;

}

return m_transform;

}

////////////////////////////////////////////////////////////

const Transform& Transformable::getInverseTransform() const

{

// Recompute the inverse transform if needed

if (m_inverseTransformNeedUpdate)

{

m_inverseTransform = getTransform().getInverse();

m_inverseTransformNeedUpdate = false;

}

return m_inverseTransform;

}

} // namespace sf

SFML/src/SFML/Graphics/Transformable.cpp at master · githubhy/SFML · GitHub

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