Graphing a Rotated Ellipse
So i have code to draw an Ellipse, but I need to modify it so i can rotate it about an angle (namely, 45 deg) but can't seem to figure it out. If you can show me how to do this, I would appreciate it.
Code:
struct Ellipse : Shape {
Ellipse(Point p, int w, int h) // center, min, and max distance from center
: w(w), h(h)
{
add(Point(p.x-w,p.y-h));
}
void draw_lines() const;
Point center() const { return Point(point(0).x+w,point(0).y+h); }
Point focus1() const { return Point(center().x+int(sqrt(double(w*w-h*h))),center().y); }
Point focus2() const { return Point(center().x-int(sqrt(double(w*w-h*h))),center().y); }
void set_major(int ww) { w=ww; }
int major() const { return w; }
void set_minor(int hh) { h=hh; }
int minor() const { return h; }
private:
int w;
int h;
};
Re: Graphing a Rotated Ellipse