MAth-Cloud-3.0.0/www.ipsocloud.com/intimamedia.com/cpp/MAth-Plaque-Dll-1.0.0/LibPlaque/Object/regionEllipse.cpp

/*****************************************************************
    Fichier     : RegionEllipse.cpp
    Date        : 03/01/11
    Version     : 1.000
    Description : Classe de gestion des régions elliptiques
|*****************************************************************/
#include "regionEllipse.h"

#include <cstdlib>

RegionEllipse::RegionEllipse()
{
  top = 0; 
  bottom = 0; 
  left = 0; 
  right = 0; 
}

RegionEllipse::~RegionEllipse()    
{
}

bool RegionEllipse::PtInRegion0(int x, int y) 
{
	Point vPoint; 

	vPoint.x = x;
	vPoint.y = y; 

	return PtInRegion(&vPoint);
}

bool RegionEllipse::PtInRegion(Point *vPoint)
{
	double x, y, x0, y0, a, b; 
	bool c = false;  
	
	x0 = (left + right) / 2.0;
	y0 = (top + bottom) / 2.0;
  
	a = abs(right - left) / 2.0;
	b = abs(bottom - top) / 2.0; 
  
	x = vPoint->x;
	y = vPoint->y;

	if (((((x - x0) / a) * ((x - x0) / a)) + (((y - y0) / b) * ((y - y0) / b))) <= 1)
	{
		c = true; 
	}
  
	return c; 
}

bool RegionEllipse::CreateEllipticRgn(Rect rcDraw)
{ 
  top = rcDraw.top; 
  bottom = rcDraw.bottom; 
  left = rcDraw.left; 
  right = rcDraw.right; 
  
  return true;
}  

void RegionEllipse::DeleteObject()
{
  top = 0; 
  bottom = 0; 
  left = 0; 
  right = 0; 
}