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Added new polygons in polygons_init_state() and now drawing the point of

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impact and the normal vector in that point
This commit is contained in:
Karma Riuk 2023-04-25 12:05:39 +02:00
parent 02f60aaa8a
commit 6b049eb831
1 changed files with 38 additions and 14 deletions
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52
polygons.cc
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@ -36,11 +36,24 @@ void polygons_init_state() {
polygons[4] = poly_generate::rectangle(50, height / 2., INFINITY)
.set_center({25 + width * 1. / 2, height / 2.})
.set_angle(0);
polygons[5] = poly_generate::square(100, 1)
.set_center({200, 200})
.set_angle(-30)
.set_angular_speed(0)
.set_speed({200, -200});
.set_center({200, 180})
.set_angle(-60)
.set_speed({200, -10});
// .set_angle(45)
// .set_center({600, 650})
// .set_speed({-200, -10});
// .set_center({200, 160})
// .set_angle(-45)
// .set_speed({200, 10});
// polygons[5] = poly_generate::regular(100, 8)
// .set_angle(0)
// .set_center({600, 650})
// .set_speed({-200, 200});
}
static double to_rad(double angle_in_deg) {
@ -96,16 +109,17 @@ static void handle_collision(collision& c, polygon* a, polygon* b) {
// avoid the polygons getting stuck if, on the frame after the impact,
// the polygon a is still inside of b
// std::cout << "sign(v_a x n) = " << << std::endl;
// if (vec2d::dot(a->speed, c.n) > 0 &&
// vec2d::dot(a->speed, c.impact_point - a->centroid()) > 0 &&
// sign(vec2d::cross(c.n, a->speed)) == -sign(a->angular_speed))
// // might have to tweak this condition
// return;
if (vec2d::dot(a->speed, c.n) > 0 &&
vec2d::dot(a->speed, c.impact_point - a->centroid()) > 0 &&
sign(vec2d::cross(c.n, a->speed)) == -sign(a->angular_speed))
// might have to tweak this condition
return;
double omega_a1 = to_rad(a->angular_speed);
double omega_b1 = to_rad(b->angular_speed);
vec2d r_ap = c.impact_point - a->centroid();
vec2d v_ap1 = a->speed + vec2d::cross(omega_a1, r_ap);
std::cout << " p = " << c.impact_point << std::endl;
std::cout << " r_ap = " << r_ap << std::endl;
std::cout << " v_ap1 = " << v_ap1 << std::endl;
@ -149,6 +163,8 @@ static void handle_collision(collision& c, polygon* a, polygon* b) {
b->angular_speed = to_deg(omega_b2);
}
collision col; // tbd
static void check_collisions(polygon* current_p) {
rect cur_bound = current_p->get_bounding_box();
@ -159,9 +175,10 @@ static void check_collisions(polygon* current_p) {
rect other_bound = other_p->get_bounding_box();
if (bounding_rects_collide(cur_bound, other_bound) ||
bounding_rects_collide(other_bound, cur_bound)) {
std::cout << "Bounding boxes do collide" << std::endl;
// std::cout << "Bounding boxes do collide" << std::endl;
collision c = collides(*current_p, *other_p);
if (c.collides) {
col = c;
std::cout << "colliding" << std::endl;
std::cout << "speed before: " << current_p->speed << std::endl;
std::cout << "angular speed before: "
@ -233,8 +250,17 @@ void polygon::draw_bounding_rect(cairo_t* cr) const {
cairo_set_dash(cr, 0, 0, 0); // disable dashes
}
static void draw_circle(cairo_t* cr, vec2d p, double radius) {
cairo_translate(cr, p.x, p.y);
cairo_arc(cr, 0, 0, radius, 0, 2 * M_PI);
cairo_fill(cr);
cairo_translate(cr, -p.x, -p.y);
}
void polygon::draw(cairo_t* cr) const {
// this->draw_bounding_rect(cr);
draw_circle(cr, col.impact_point, 3); // tbd
col.n.draw(cr, col.impact_point); // tbd
cairo_set_source_rgb(cr, 1, 1, 1);
@ -244,12 +270,10 @@ void polygon::draw(cairo_t* cr) const {
cairo_line_to(cr, this->global_points[0].x, this->global_points[0].y);
cairo_stroke(cr);
// draw centroid
vec2d centroid = this->centroid();
cairo_translate(cr, centroid.x, centroid.y);
cairo_arc(cr, 0, 0, 1, 0, 2 * M_PI);
cairo_stroke(cr);
cairo_translate(cr, -centroid.x, -centroid.y);
draw_circle(cr, centroid, 1);
}
void polygons_draw(cairo_t* cr) {