Fix clock being real and not user clock

main_bounce.cpp

@@ -12,9 +12,14 @@ int main(int argc, char** argv) {
     GlutRender& render = GlutRender::get_instance();
     render.init(&argc, argv, 640, 480, "Bouncing stuff");
 
-    Ball ball(Point(0, 0, 10), 0, .25, 1, 1);
+    Ball ball(Point(0, 10, 0), 0.25, 0.25, 0, 1, 1);
+
+    Cuboid bbox = ball.get_surface()->max_bounding_box();
+    printf("%.2lf %.2lf %.2lf | %.2lf %.2lf %.2lf\n",
+            bbox.low(0), bbox.low(1), bbox.low(2),
+            bbox.high(0), bbox.high(1), bbox.high(2));
     render.add_surface(ball.get_surface(),
-            Cuboid(Point(-2, -2, -2), Point(2, 2, 2)));
+            ball.get_surface()->max_bounding_box());
 
     render.set_idle_func(periodic_update);
     init_periodic_static(&ball);

periodic_updates.cpp

@@ -1,24 +1,38 @@
 #include "periodic_updates.hpp"
 
 #include <ctime>
+#include <chrono>
 #include <GL/glut.h>
 
 static Ball* _ball = nullptr;
-static clock_t _last_time = 0;
-
-double time_of_clocks(clock_t time) {
-    return ((double)time) / ((double)CLOCKS_PER_SEC);
-}
+static std::chrono::time_point<std::chrono::steady_clock>
+    _last_time, _init_clocks;
 
 void init_periodic_static(Ball* ball) {
-    _last_time = clock();
+    _last_time = std::chrono::steady_clock::now();
+    _init_clocks = std::chrono::steady_clock::now();
     _ball = ball;
 }
 
-void periodic_update() {
-    clock_t now = clock();
-    _ball->update_pos(time_of_clocks(now - _last_time));
-    _last_time = now;
+double ellapsed_double(
+        std::chrono::time_point<std::chrono::steady_clock> beg,
+        std::chrono::time_point<std::chrono::steady_clock> end)
+{
+    std::chrono::duration<double> ellapsed_db = end - beg;
+    return ellapsed_db.count();
+}
 
+void periodic_update() {
+    auto now = std::chrono::steady_clock::now();
+    _ball->update_pos(ellapsed_double(_last_time, now));
+
+    fprintf(stderr, "dt = %lf, tot = %lf; center: %.2lf, %.2lf, %.2lf\n",
+            ellapsed_double(_last_time, now),
+            ellapsed_double(_init_clocks, now),
+            _ball->getCenter().x,
+            _ball->getCenter().y,
+            _ball->getCenter().z);
+
+    _last_time = now;
     glutPostRedisplay();
 }

render/GlutRender.cpp

@@ -103,8 +103,8 @@ void GlutRender::display() {
     // Camera position and orientation
     glLoadIdentity();
     //glTranslatef(1., 2., -10.);
-    gluLookAt(0, 0, -10,
-            0, 0, 10,
+    gluLookAt(0, 5, -20,
+            0, 5, 0,
             0, 1, 0);
 
     for(Mesh* mesh: meshes) {

spheroid.cpp

@@ -52,7 +52,7 @@ void Spheroid::check_vertical_plan_collision(double& abscissa) {
 }
 
 Cuboid Spheroid::max_bounding_box() const {
-    double max_radius = sqrt((3/4) * V / PI / min_p);
+    double max_radius = sqrt((3./4.) * V / PI / min_p);
     double max_height = init_p;
     Point _bd1(max_radius, max_radius, max_height);
     Point _bd2(-max_radius, -max_radius, -max_height);