Théophile Bastian
baaa5e4057
Keys: space for toggle pause, < and > for speed control, 0 to reset speed
58 lines
1.4 KiB
C++
58 lines
1.4 KiB
C++
#include "periodic_updates.hpp"
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#include <ctime>
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#include <chrono>
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#include <GL/glut.h>
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static Ball* _ball = nullptr;
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static std::chrono::time_point<std::chrono::steady_clock>
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_last_time, _init_clocks;
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static bool is_paused = false;
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static double speed_factor = 1.;
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void init_periodic_static(Ball* ball) {
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_last_time = std::chrono::steady_clock::now();
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_init_clocks = std::chrono::steady_clock::now();
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_ball = ball;
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}
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double ellapsed_double(
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std::chrono::time_point<std::chrono::steady_clock> beg,
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std::chrono::time_point<std::chrono::steady_clock> end)
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{
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std::chrono::duration<double> ellapsed_db = end - beg;
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return ellapsed_db.count();
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}
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void periodic_update() {
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if(is_paused)
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return;
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printf("%lf\n", speed_factor);
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auto now = std::chrono::steady_clock::now();
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_ball->update_pos(speed_factor * ellapsed_double(_last_time, now));
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_last_time = now;
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glutPostRedisplay();
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}
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void periodic_kb_handler(unsigned char key, int, int) {
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if(key == ' ') {
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if(is_paused)
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_last_time = std::chrono::steady_clock::now();
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is_paused = !is_paused;
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}
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else if(key == '<') {
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speed_factor -= .1;
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if(speed_factor <= 0.05)
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speed_factor = .1;
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}
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else if(key == '>') {
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speed_factor += .1;
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}
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else if(key == '0') {
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speed_factor = 1.;
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}
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}
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