Category : Files from Magazines
Archive   : MICROCAD.ZIP
Filename : CADSHAPE.HPP

 
Output of file : CADSHAPE.HPP contained in archive : MICROCAD.ZIP
// Figure 4 for "A Little CAD with C++"
// Copyright 1988 Bruce Eckel
// Permission required to distribute source

// file: cadshape.hpp
/* A polymorphic base class for all shapes.
Almost all functions are virtual, so they
can be redefined in derived classes. Then
we can make a list of shapes and draw()
each shape in the list without knowing
exactly what it is. */
#ifndef CADSHAPE_HPP
#define CADSHAPE_HPP
class cadshape {
unsigned x_center, y_center;
public:
// virtual functions must have SOME
// definition in the base class, even
// if it's just empty:
virtual ~cadshape() {}
virtual void draw() {}
virtual void erase() {}
void
move(unsigned new_x, unsigned new_y ) {
x_center = new_x;
y_center = new_y;
draw(); // call proper virtual function
}
unsigned long
range( unsigned xr, unsigned yr ) {
// a measure of distance between a
// selected point and this object's center
unsigned long xx =
xr > x_center ?
xr - x_center : x_center - xr;
// (ternary if-then-else)
unsigned long yy =
yr > y_center ?
yr - y_center : y_center - yr;
xx *= xx;
yy *= yy;
// delta x squared + delta y squared:
return xx + yy;
}
};
#endif CADSHAPE_HPP


  3 Responses to “Category : Files from Magazines
Archive   : MICROCAD.ZIP
Filename : CADSHAPE.HPP

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