ximath.cpp

#include "ximage.h"
#include "ximath.h"
#include <math.h>

//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;
}