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////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2016 Laurent Gomila (laurent@sfml-dev.org)
//
// 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
{
////////////////////////////////////////////////////////////
Transformable::Transformable() :
m_origin (0, 0),
m_position (0, 0),
m_rotation (0),
m_scale (1, 1),
m_transform (),
m_transformNeedUpdate (true),
m_inverseTransform (),
m_inverseTransformNeedUpdate(true)
{
}
////////////////////////////////////////////////////////////
Transformable::~Transformable()
{
}
////////////////////////////////////////////////////////////
void Transformable::setPosition(float x, float y)
{
m_position.x = x;
m_position.y = y;
m_transformNeedUpdate = true;
m_inverseTransformNeedUpdate = true;
}
////////////////////////////////////////////////////////////
void Transformable::setPosition(const Vector2f& position)
{
setPosition(position.x, position.y);
}
////////////////////////////////////////////////////////////
void Transformable::setRotation(float angle)
{
m_rotation = static_cast<float>(fmod(angle, 360));
if (m_rotation < 0)
m_rotation += 360.f;
m_transformNeedUpdate = true;
m_inverseTransformNeedUpdate = true;
}
////////////////////////////////////////////////////////////
void Transformable::setScale(float factorX, float factorY)
{
m_scale.x = factorX;
m_scale.y = factorY;
m_transformNeedUpdate = true;
m_inverseTransformNeedUpdate = true;
}
////////////////////////////////////////////////////////////
void Transformable::setScale(const Vector2f& factors)
{
setScale(factors.x, factors.y);
}
////////////////////////////////////////////////////////////
void Transformable::setOrigin(float x, float y)
{
m_origin.x = x;
m_origin.y = y;
m_transformNeedUpdate = true;
m_inverseTransformNeedUpdate = true;
}
////////////////////////////////////////////////////////////
void Transformable::setOrigin(const Vector2f& origin)
{
setOrigin(origin.x, origin.y);
}
////////////////////////////////////////////////////////////
const Vector2f& Transformable::getPosition() const
{
return m_position;
}
////////////////////////////////////////////////////////////
float 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(float offsetX, float offsetY)
{
setPosition(m_position.x + offsetX, m_position.y + offsetY);
}
////////////////////////////////////////////////////////////
void Transformable::move(const Vector2f& offset)
{
setPosition(m_position.x + offset.x, m_position.y + offset.y);
}
////////////////////////////////////////////////////////////
void Transformable::rotate(float angle)
{
setRotation(m_rotation + angle);
}
////////////////////////////////////////////////////////////
void Transformable::scale(float factorX, float factorY)
{
setScale(m_scale.x * factorX, m_scale.y * factorY);
}
////////////////////////////////////////////////////////////
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)
{
float angle = -m_rotation * 3.141592654f / 180.f;
float cosine = static_cast<float>(std::cos(angle));
float sine = static_cast<float>(std::sin(angle));
float sxc = m_scale.x * cosine;
float syc = m_scale.y * cosine;
float sxs = m_scale.x * sine;
float sys = m_scale.y * sine;
float tx = -m_origin.x * sxc - m_origin.y * sys + m_position.x;
float ty = m_origin.x * sxs - m_origin.y * syc + m_position.y;
m_transform = Transform( sxc, sys, tx,
-sxs, syc, ty,
0.f, 0.f, 1.f);
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
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