#include "triangle.h"
#include "line.h"

triangle::triangle(const coordsys& s, const coordinate& _a,
                   const coordinate& _b, const coordinate& _c) :
          shape(s),ap(_a),bp(_b),cp(_c) { }


void triangle::draw(canvas& C) {
   coordinate a(ap),b(bp),c(cp);

   // calculate center
   coordinate o((ap.x()+bp.x()+cp.x())/3,(ap.y()+bp.y()+cp.y())/3);

   a =  system.rotate(a,o,center_angle);
   b =  system.rotate(b,o,center_angle);
   c =  system.rotate(c,o,center_angle);

   if (rotate) {
     a = system.rotate(a,rotation_center,rotation_angle);
     b = system.rotate(b,rotation_center,rotation_angle);
     c = system.rotate(c,rotation_center,rotation_angle);
     o = system.rotate(o,rotation_center,rotation_angle);
   }

   coordsys paper(0,0,C.width(),C.height());

   a = paper.map(system,a);
   b = paper.map(system,b);
   c = paper.map(system,c);

   C.draw_line(round(a.x()),round(a.y()),
      round(b.x()),round(b.y()),pen_color,id);
   C.draw_line(round(b.x()),round(b.y()),
      round(c.x()),round(c.y()),pen_color,id);
   C.draw_line(round(c.x()),round(c.y()),
      round(a.x()),round(a.y()),pen_color,id);

   if (filled) {
     o = paper.map(system,o);
     coordinate p;
     bool in = false;
     if (!inside(o,C)) {
        if (inside(a,C)) {
           o = find_in(a,o,C);
           in = true;
        } else if (inside(b,C)) {
           o = find_in(b,o,C);
           in = true;
        } else if (inside(c,C)) {
           o = find_in(c,o,C);
           in = true;
        } else if (intersects(a,b,C,p)) {
           o = find_in(p,o,C);
           in = true;
        } else if (intersects(a,c,C,p)) {
           o = find_in(p,o,C);
           in = true;
        } else if (intersects(b,c,C,p)) {
           o = find_in(p,o,C);
           in = true;
        }
     } else { // inside
       in = true;
     }
     if (in) C.fill_area(round(o.x()),round(o.y()),id,fill_color);
   }
}