vcmi/client/Gfx/Basic.cpp

#include "StdInc.h"
#include "Basic.h"

namespace Gfx
{

void Rect::addOffs_copySize(const Rect & r)
{
	x += r.x;
	y += r.y;
	w = r.w;
	h = r.h;
}


Rect Rect::operator&(const Rect &p) const //rect intersection
{
	bool intersect = true;

	if (
			leftX() > p.rightX() //rect p is on the left hand side of this
		||	rightX() < p.leftX() //rect p is on the right hand side of this
		||	topY() > p.bottomY() //rect p is above *this
		||	bottomY() < p.topY() //rect p is below *this
		)
	{
		return Rect();
	}
	else
	{
		Rect ret;
		ret.x = std::max(this->x, p.x);
		ret.y = std::max(this->y, p.y);
		Point bR; //bottomRight point of returned rect
		bR.x = std::min(this->w+this->x, p.w+p.x);
		bR.y = std::min(this->h+this->y, p.h+p.y);
		ret.w = bR.x - ret.x;
		ret.h = bR.y - ret.y;
		return ret;
	}
}

}