Constructing with Color

cube::cube(float x)

{

length = x;

}

cube::cube(float x, Color *c)

: body(c)

{

length = x;

}

cube and cylinder get a new constructor:

cylinder::cylinder(float r, float h)

{

radius = r;

height = h;

}

cylinder::cylinder(float r, float h, Color *c)

: body(c)

{

radius = r;

height = h;

}

They pass the color on to the constructor for body which takes care of things.

The first constructor calls (by default) body() without parameters; this constructor assigns the default color (black) to the body.

What we see:

• each constructed cube and cylinder just lets the parent class deal with the color attributes; there is no need to duplicate that functionality.

• the cube & cylinder classes inherit the functionality from their parents

• the parent (body) maintains the color as an associated class.

• we can change the color attribute at run time.

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