MAth-Cloud-3.0.0/api.ipsocloud.com/math-plaque/imt/region.cpp

/*******************************************************************
    Fichier     : Region.cpp
    Date        : 14/12/10
    Version     : 1.000
    Description : Classe de gestion des régions
|*******************************************************************/
#include "region.h"

#include <cstdlib>

Region::Region()
{
	m_tpoints = NULL;
	m_nbPoints = 0; 
}

Region::~Region()    
{
  if ( m_tpoints )
  {
    delete[] m_tpoints;
    m_tpoints = NULL;
	m_nbPoints = 0; 
  }
}

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

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

	return PtInRegion(&vPoint);
}

bool Region::PtInRegion(Point *vPoint)
{
	int i, j, vx, vy; 
	bool c = false;  

	vx = vPoint->x;
	vy = vPoint->y;

	for (i = 0, j = m_nbPoints - 1; i < m_nbPoints; j = i++) 
	{
		if ((m_tpoints[j].y - m_tpoints[i].y) != 0) // Contre les divisions par 0
		{
			if ((((m_tpoints[i].y <= vy) && (vy < m_tpoints[j].y))  
			|| ((m_tpoints[j].y <= vy) && (vy < m_tpoints[i].y))) && 
			(vx < (m_tpoints[j].x - m_tpoints[i].x) * (vy - m_tpoints[i].y) / (m_tpoints[j].y - m_tpoints[i].y) + m_tpoints[i].x))
			{
				c = !c;
			}
		}
	}

	return c; 
}

Rect Region::GetRgnBox()
{
	int minx, maxx, miny, maxy;
	int i; 
	Rect vRect; 

	minx = 32768;
	maxx = 0; 
	miny = 32768;
	maxy = 0; 

	for (i = 0; i < m_nbPoints; i++) 
	{
		if (m_tpoints[i].x <= minx)
		{
			minx = m_tpoints[i].x;
		}

		if (m_tpoints[i].x >= maxx)
		{
			maxx = m_tpoints[i].x;
		}

		if (m_tpoints[i].y <= miny)
		{
			miny = m_tpoints[i].y;
		}

		if (m_tpoints[i].y >= maxy)
		{
			maxy = m_tpoints[i].y;
		}
	}

	vRect.left = minx; 
	vRect.right = maxx;
	vRect.top = miny;
	vRect.bottom = maxy;

	return vRect;
}

bool Region::CreatePolygonRgn(Point *tabPoints, int n_points)
{
  int i; 
/*
  if ( !tabPoints )
  {
    return false;
  }
*/  
  m_nbPoints = n_points;
  m_tpoints = new Point[ n_points ];
  
/*  if ( !m_tpoints )
  {
    return false;
  } 
*/  	
  for (i = 0; i < m_nbPoints; i++) 
  {
	  m_tpoints[i].x = tabPoints[i].x;
  	  m_tpoints[i].y = tabPoints[i].y;
  }
   
  return true;
}  

void Region::DeleteObject()
{
  if ( m_tpoints )
  {
    delete[] m_tpoints;
    m_tpoints = NULL;
	  m_nbPoints = 0; 
  }
}