www.pudn.com > cximage602_full.rar > ximath.cpp

#include "ximage.h" 
#include "ximath.h" 
#include  
 
//this module should contain some classes for geometrical transformations 
//usable with selections, etc... once it's done, that is. :) 
 
CxPoint2::CxPoint2() 
{ 
  x=y=0.0f; 
} 
 
CxPoint2::CxPoint2(float const x_, float const y_) 
{ 
  x=x_; 
  y=y_; 
} 
 
CxPoint2::CxPoint2(CxPoint2 const &p) 
{ 
  x=p.x; 
  y=p.y; 
} 
 
float CxPoint2::Distance(CxPoint2 const p2) 
{ 
  return (float)sqrt((x-p2.x)*(x-p2.x)+(y-p2.y)*(y-p2.y)); 
} 
 
float CxPoint2::Distance(float const x_, float const y_) 
{ 
  return (float)sqrt((x-x_)*(x-x_)+(y-y_)*(y-y_)); 
} 
 
CxRect2::CxRect2() 
{ 
} 
 
CxRect2::CxRect2(float const x1_, float const y1_, float const x2_, float const y2_) 
{ 
  botLeft.x=x1_; 
  botLeft.y=y1_; 
  topRight.x=x2_; 
  topRight.y=y2_; 
} 
 
CxRect2::CxRect2(CxRect2 const &p) 
{ 
  botLeft=p.botLeft; 
  topRight=p.topRight; 
} 
 
float CxRect2::Surface() const 
/* 
 * Returns the surface of rectangle. 
 */ 
{ 
  return (topRight.x-botLeft.x)*(topRight.y-botLeft.y); 
} 
 
CxRect2 CxRect2::CrossSection(CxRect2 const &r2) const 
/* 
 * Returns crossection with another rectangle. 
 */ 
{ 
  CxRect2 cs; 
  cs.botLeft.x=max(botLeft.x, r2.botLeft.x); 
  cs.botLeft.y=max(botLeft.y, r2.botLeft.y); 
  cs.topRight.x=min(topRight.x, r2.topRight.x); 
  cs.topRight.y=min(topRight.y, r2.topRight.y); 
  if (cs.botLeft.x<=cs.topRight.x && cs.botLeft.y<=cs.topRight.y) { 
    return cs; 
  } else { 
    return CxRect2(0,0,0,0); 
  }//if 
} 
 
CxPoint2 CxRect2::Center() const 
/* 
 * Returns the center point of rectangle. 
 */ 
{ 
  return CxPoint2((topRight.x+botLeft.x)/2.0f, (topRight.y+botLeft.y)/2.0f); 
} 
 
float CxRect2::Width() const 
//returns rectangle width 
{ 
  return topRight.x-botLeft.x; 
} 
 
float CxRect2::Height() const 
//returns rectangle height 
{ 
  return topRight.y-botLeft.y; 
}