127 lines
3.1 KiB
C++
127 lines
3.1 KiB
C++
#ifndef POLYGONS_H_INCLUDED
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#define POLYGONS_H_INCLUDED
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#include "vec2d.h"
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#include <cmath>
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#include <gtk/gtk.h>
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#include <utility>
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#include <vector>
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typedef std::pair<vec2d, vec2d> rect;
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class polygon {
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private:
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void update_global_points();
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public:
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vec2d center;
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double angle;
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std::vector<vec2d> points;
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double inertia;
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double mass;
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std::string label;
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std::vector<vec2d> global_points = points;
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vec2d speed;
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double angular_speed;
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void draw(cairo_t* cr) const;
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void draw_bounding_rect(cairo_t* cr) const;
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rect get_bounding_box() const {
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vec2d tl{INFINITY, INFINITY}, tr{-INFINITY, -INFINITY};
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for (auto& point : this->global_points) {
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if (point.x < tl.x)
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tl.x = point.x;
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if (point.y < tl.y)
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tl.y = point.y;
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if (point.x > tr.x)
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tr.x = point.x;
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if (point.y > tr.y)
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tr.y = point.y;
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}
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return {tl, tr};
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}
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polygon& set_center(vec2d c) {
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center = c;
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update_global_points();
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return *this;
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}
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polygon& set_speed(vec2d s) {
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speed = s;
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return *this;
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}
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polygon& set_angular_speed(double as) {
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angular_speed = as;
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return *this;
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}
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polygon& set_angle(double a) {
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angle = a;
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update_global_points();
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return *this;
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}
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polygon& set_mass(double m) {
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mass = m;
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// TODO: This is pretty shit, but it's good to make stuff work now,
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// since the only time we change the mass of an object is the wall,
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// otherwise we take the area and the polygon_generator module handles
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// that. But what's to be done is to extract the intertia calcualtion to
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// a new module so that we can import it here, and recalculate the
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// intertia of the polygon if the mass changes.
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if (m == INFINITY)
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inertia = INFINITY;
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return *this;
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}
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polygon& translate(vec2d delta) {
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center += delta;
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update_global_points();
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return *this;
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}
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polygon& rotate(double delta) {
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angle += delta;
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update_global_points();
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return *this;
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}
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vec2d centroid() const {
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double x = 0, y = 0;
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for (auto& p : global_points)
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x += p.x, y += p.y;
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return vec2d{x, y} / points.size();
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}
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friend std::ostream& operator<<(std::ostream& os, polygon& p) {
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vec2d c = p.centroid();
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os << p.label << ": " << std::endl;
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os << " mass: " << p.mass << std::endl;
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os << " position: " << c << std::endl;
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os << " angle: " << p.angle << std::endl;
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os << " speed: " << p.speed << std::endl;
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os << " angular speed: " << p.angular_speed << std::endl;
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os << " intertia: " << p.inertia << std::endl;
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return os;
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}
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};
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extern polygon* polygons;
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extern uint n_polygons;
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extern void polygons_init_state();
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extern void polygons_update_state();
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extern void polygons_draw(cairo_t* cr);
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extern void polygons_destroy();
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#endif
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