mitchellhansen/flappy-bird-sfml
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A proper loop

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MitchellHansen
2015-11-23 16:21:09 -08:00
parent e9627b80dc
commit a4695838d9
1 changed files with 98 additions and 48 deletions
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70
Flappy/main.cpp
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@@ -2,12 +2,28 @@
#include <SFML/Graphics.hpp>
#include <iostream>
#include <random>
#include <windows.h>
const float g = 7.8;
const int WINDOW_X = 600;
const int WINDOW_Y = 800;
const int pipe_dist = 300;
float elap_time() {
static __int64 start = 0;
static __int64 frequency = 0;
if (start == 0) {
QueryPerformanceCounter((LARGE_INTEGER*)&start);
QueryPerformanceFrequency((LARGE_INTEGER*)&frequency);
return 0.0f;
}
__int64 counter = 0;
QueryPerformanceCounter((LARGE_INTEGER*)&counter);
return (float)((counter - start) / double(frequency));
}
int main()
{
std::mt19937 rng(time(NULL));
@@ -38,10 +54,24 @@ int main()
double momentum = 0;
int r = 0;
float step_size = 0.005f;
double current_time = 0.0;
double frame_time = 0.0;
double instant_fps = 0.0;
double accumulator_time = 0.0;
int render_frame_count = 0;
double render_fps = 0;
int physics_frame_count = 0;
double physics_fps = 0;
double elapsed_time = 0;
double delta_time = 0;
while (window.isOpen())
{
std::cout << r++ << std::endl;
sf::Event event;
while (window.pollEvent(event)) {
if (event.type == sf::Event::Closed) {
@@ -49,31 +79,43 @@ int main()
}
}
// Move pipes, background
elapsed_time = elap_time();
delta_time = elapsed_time - current_time;
current_time = elapsed_time;
if (delta_time > 0.02f)
delta_time = 0.02f;
accumulator_time += delta_time;
while ((accumulator_time - step_size) >= step_size) {
accumulator_time -= step_size;
// Update logic
// Move pipes, background, floor
if (pipe_down_sprite.getPosition().x < -pipe_down_sprite.getGlobalBounds().width) {
pipe_down_sprite.setPosition(WINDOW_X, rgen(rng));
pipe_up_sprite.setPosition(WINDOW_X, pipe_down_sprite.getPosition().y + pipe_dist);
}
else {
pipe_up_sprite.setPosition(pipe_up_sprite.getPosition().x - 0.2, pipe_up_sprite.getPosition().y);
pipe_down_sprite.setPosition(pipe_down_sprite.getPosition().x - 0.2, pipe_down_sprite.getPosition().y);
pipe_up_sprite.setPosition(pipe_up_sprite.getPosition().x - step_size * 100, pipe_up_sprite.getPosition().y);
pipe_down_sprite.setPosition(pipe_down_sprite.getPosition().x - step_size * 100, pipe_down_sprite.getPosition().y);
}
if (background_sprite.getPosition().x + background_sprite.getGlobalBounds().width < WINDOW_X) {
background_sprite.setPosition(0, 0);
}
else {
background_sprite.setPosition(background_sprite.getPosition().x - 0.1, background_sprite.getPosition().y);
background_sprite.setPosition(background_sprite.getPosition().x - step_size * 80, background_sprite.getPosition().y);
}
if (land_sprite.getPosition().x + 10 + land_sprite.getGlobalBounds().width < WINDOW_X) {
land_sprite.setPosition(14, land_sprite.getPosition().y);
}
else {
land_sprite.setPosition(land_sprite.getPosition().x - 0.2, land_sprite.getPosition().y);
land_sprite.setPosition(land_sprite.getPosition().x - step_size * 100, land_sprite.getPosition().y);
}
// Check collisions
if (flappy.getPosition().y > land_sprite.getPosition().y) {
flappy.setPosition(WINDOW_X / 2, WINDOW_Y / 2);
momentum = 0;
@@ -89,15 +131,22 @@ int main()
std::cout << "dead";
}
// Get input
if (sf::Keyboard::isKeyPressed(sf::Keyboard::Space)) {
momentum = -.4;
momentum = -2;
}
if (sf::Mouse::isButtonPressed(sf::Mouse::Left)) {
momentum = -2;
}
momentum += g / 10000;
momentum += g * step_size;
f_pos.y += momentum;
flappy.setPosition(f_pos);
physics_frame_count++;
}
window.clear(sf::Color::Black);
window.draw(background_sprite);
window.draw(land_sprite);
@@ -128,3 +177,4 @@ int main()
return 0;
}