Transform.hpp

// Copyright (c) 2016-2018 Kiwano - Nomango
//
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// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
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// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// THE SOFTWARE.
 
#pragma once
#include <kiwano/math/Vec2.hpp>
#include <kiwano/math/Matrix.hpp>
 
namespace kiwano
{
namespace math
{
 
template <typename _Ty>
class TransformT
{
public:
    using ValueType = _Ty;
 
    float            rotation;  
    Vec2T<ValueType> position;  
    Vec2T<ValueType> scale;     
    Vec2T<ValueType> skew;      
 
public:
    TransformT();
 
    Matrix3x2T<ValueType> ToMatrix() const;
 
    bool IsFast() const;
 
    bool operator==(const TransformT& rhs) const;
};
 
template <typename _Ty>
inline TransformT<_Ty>::TransformT()
    : position()
    , rotation(0.f)
    , scale(1.f, 1.f)
    , skew(0.f, 0.f)
{
}
 
template <typename _Ty>
Matrix3x2T<_Ty> TransformT<_Ty>::ToMatrix() const
{
    if (!skew.IsOrigin())
    {
        return Matrix3x2T<_Ty>::Skewing(skew) * Matrix3x2T<_Ty>::SRT(position, scale, rotation);
    }
    return Matrix3x2T<_Ty>::SRT(position, scale, rotation);
}
 
template <typename _Ty>
inline bool TransformT<_Ty>::IsFast() const
{
    return skew.x == 0.f && skew.y == 0.f && scale.x == 1.f && scale.y == 1.f && rotation == 0.f;
}
 
template <typename _Ty>
bool TransformT<_Ty>::operator==(const TransformT& rhs) const
{
    return position == rhs.position && rotation == rhs.rotation && scale == rhs.scale && skew == rhs.skew;
}
 
}  // namespace math
}  // namespace kiwano