incomplete Circle drawn with classes from PPP

[ken williams]

I'm working through Programming Principles and Practice
and I'm stuck at drawing some Circles - which are drawn "fragmented".

Please see below.

The Circle c1 below should have nothing to do with the Point x,

yet when I change the Point x from {0,0} to {20,20} , {30,30} , 

{50,50} or {100,100} I get these incomplete circles.

==========================

int main()

{

    const Point x{0, 0};

    Simple_window win{x, 600, 400, "Ch 13 Circle"};

    Circle c1{Point{100, 200}, 50};

    win.attach(c1);

    win.wait_for_button();

}

=================

Any idea what the problem is?

Thanks!

[roscopik...@gmail.com]

ive just recreated your code, and the codes fine. x is the point where the window is to display on the screen, have you looked at the Circle class?

[roscopik...@gmail.com]

with all three circles

[ken williams]

Thanks!

What version of FLTK do you use?

(and from git or archive?)

I've checked the Circle class and it's just like in the book (2nd edition):

struct Circle : Shape

{

Circle(Point p, int rr) // center and radius

: r{rr}

{

add(Point{p.x - r, p.y - r}); // store top left corner

}

void draw_lines() const;

Point center() const // returns the actual center when you have a point stored in  (the top left corner)

{

return {point(0).x + r, point(0).y + r};

// return Point(point(0).x + r, point(0).y + r); // same results with this format

} 

int radius() const { return r; } // access the private data member r

void set_radius(int rr) 

{

set_point(0, Point{center().x - rr, center().y - rr}); 

r = rr;

}

private:

int r;

};

void Circle::draw_lines() const

{

if (fill_color().visibility())

{ // fill

fl_color(fill_color().as_int());

fl_pie(point(0).x, point(0).y, r + r - 1, r + r - 1, 0, 360);

fl_color(color().as_int()); // reset color

}

if (color().visibility())

{

fl_color(color().as_int());

fl_arc(point(0).x, point(0).y, r + r, r + r, 0, 360);

} 

}