Magic_Game/core/math/Transform.cpp

// Copyright (c) 2016-2018 Easy2D - Nomango
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// 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
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#include "Transform.h"

namespace easy2d
{
	namespace math
	{
		Transform::Transform()
			: position()
			, size()
			, scale_x(1.f)
			, scale_y(1.f)
			, rotation(0)
			, skew_x(0)
			, skew_y(0)
			, pivot_x(0)
			, pivot_y(0)
		{
		}

		Matrix Transform::ToMatrix() const
		{
			auto pivot = Vector2(size.width * pivot_x, size.height * pivot_y);
			return Matrix().Scale(scale_x, scale_y, pivot)
				.Skew(skew_x, skew_y, pivot)
				.Rotate(rotation, pivot)
				.Translate(position - pivot);
		}

		bool Transform::operator==(const Transform & other) const
		{
			return position == other.position &&
				size == other.size &&
				scale_x == other.scale_x &&
				scale_y == other.scale_y &&
				skew_x == other.skew_x &&
				skew_y == other.skew_y &&
				rotation == other.rotation &&
				pivot_x == other.pivot_x &&
				pivot_y == other.pivot_y;
		}
	}
}