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General / Feedback on my projectile trajectory model.

« on: December 06, 2016, 08:49:14 pm »

Hello! I am trying to design a model for a projectile trajectory. This is my first time doing something like this so what i have done is probably not the best solution. I just applied my basic math knowledge from high school    The current flaws i know of is that its not very compatible with different screens (how could i solve this?) i also like to make the trajectory have a relation with a starting angle. (I am making a tank game where the goal is to be able to fire a projectile using a power and angle variable). This is the parabola that the projectile currently follows: https://www.wolframalpha.com/input/?i=y+%3D+-x%5E2%2F1800%2B2x and here is my code:

#include <SFML/Graphics.hpp>
#include "game.h"
#include <string>
#include <iostream>
#include <vector>
#include <math.h>

using namespace std;

int main() {

        sf::RenderWindow window(sf::VideoMode::getDesktopMode(),
                "Test", sf::Style::Fullscreen);

        window.setFramerateLimit(60);

        sf::CircleShape player(20, 5);
        player.setFillColor(sf::Color(150, 70, 250));
        player.setOutlineThickness(4);
        player.setOutlineColor(sf::Color(100, 50, 250));
        player.setPosition(200, window.getSize().y-400);
       
        bool shoot{ false };
        float yPos{};
        float timer{ 0 };
        float frametime = 1.0f / 60.0f;

        while (window.isOpen()) {
                sf::Event event;
                while (window.pollEvent(event)) {
                        if (sf::Keyboard::isKeyPressed(sf::Keyboard::Space)){
                                shoot = true;
                        }
                        else if(sf::Event::Closed){
                                window.close();
                        }
                }
                if (shoot) {
                        timer += frametime*1000;
                        yPos = -pow(timer, 2)/1800+2*timer;
                        player.setPosition(200+timer, window.getSize().y-yPos-400);
                        if (player.getPosition().y > window.getSize().y) {
                                player.setPosition(200, window.getSize().y - 400);
                                timer = 0;
                                shoot = false;
                        }
                }
                window.clear(sf::Color(16, 16, 16, 255));
                window.draw(player);
                window.display();
        }
}

EDIT: Added link to the function i am using.