LifeProject/LifeCore/math/Rectangle.h

#ifndef Rectangle_h__
#define Rectangle_h__

#include "math/Vector2D.h"

namespace LifeMath
{
	template<typename T>
	struct Rectangle
	{
		T x;
		T y;
		T width;
		T height;
		Rectangle()
		{
			x = y = width = height = 0;
		}
		Rectangle(T _width, T _height)
		{
			width = _width;
			height = _height;
			x = y = 0;
		}
		Rectangle(T _x, T _y, T _width, T _height)
		{
			width = _width;
			height = _height;
			x = _x;
			y = _y;
		}
		bool operator ==(const Rectangle<T>& other)
		{
			return ((x == other.x) && (y == other.y) && (width == other.width) && (height == other.height));
		}

		bool operator !=(const Rectangle<T>& other)
		{
			return ((x != other.x) || (y != other.y) || (width != other.width) || (height != other.height));
		}

		//get rectangle minimum corner coordinate
		Vector2D<T> GetMin() const
		{
			return Vector2D<T>(x, y);
		}
		//get rectangle maximum corner coordinate
		Vector2D<T> GetMax() const
		{
			return Vector2D<T>(x + (width), y + (height));
		}
		//get rectangle maximum X
		T GetMaxX() const
		{
			return x + (width);
		}
		//get rectangle maximum Y
		T GetMaxY() const
		{
			return y + (height);
		}
		//get rectangle square
		T GetSquare() const
		{
			return width * height;
		}
		//merge 2 rectangles into 1 bounding rectangle
		void Merge(const Rectangle<T>& other)
		{
			int minX = std::min<T>(x, other.x);
			int maxX = std::max<T>(this->GetMaxX(), other.GetMaxX());

			int minY = std::min<T>(y, other.y);
			int maxY = std::max<T>(this->GetMaxY(), other.GetMaxY());

			this->x = minX;
			this->y = minY;

			this->width = maxX - minX;
			this->height = maxY - minY;
		}
		//crop this rectangle by other rectangle
		void Crop(const Rectangle<T>& other)
		{
			if(this->x < other.x)
			{
				T diff = other.x - this->x;
				this->x += diff;
				this->width -= diff;
			}
			if(this->y < other.y)
			{
				T diff = other.y - this->y;
				this->y += diff;
				this->height -= diff;
			}
			if(this->GetMaxX() > other.GetMaxX())
			{
				T diff = this->GetMaxX() - other.GetMaxX();
				this->width -= diff;
			}
			if(this->GetMaxY() > other.GetMaxY())
			{
				T diff = this->GetMaxY() - other.GetMaxY();
				this->height -= diff;
			}

			if(width < 0)
				width = 0;
			if(height < 0)
				height = 0;
		}
		bool InRect(const T x, const T y)
		{
			return (x >= this->x && y >= this->y && x <= (this->x + width) && y <=(this->y + height));
		}
		bool InRect(const Vector2D<T>& point)
		{
			return InRect(point.X, point.Y);
		}
	};

	typedef Rectangle<int> Rect2i;
	typedef Rectangle<float> Rect2f;
	typedef Rectangle<double> Rect2d;
}
#endif // Rectangle_h__