Topics

1

General / Whats wrong with my collision detection?

« on: March 24, 2023, 04:44:29 pm »

So ive been re learning SFML and i really wanted to learn collision, and i understand it far better now, but im still having a few issues, here is my code, what am i doing wrong with my collision? its not working.

//============================================================================
// Name             : SFML Game
// Author           : Chay Hawk
// Version          : 0.0.14
// Version Date     : March 24th 2023 @ 11:27 AM
// Date Created     :
// Lines of Code    : 224
// Description      :
//============================================================================

#include <iostream>
#include <string>
#include <sstream>
#include <SFML/Graphics.hpp>

sf::Text CreateText(const sf::Font& font, int characterSize, const sf::Color& color, float posX, float posY, const std::string& str)
{
    sf::Text text;
    text.setCharacterSize(characterSize);
    text.setFont(font);
    text.setFillColor(color);
    text.setPosition(sf::Vector2f(posX, posY));
    text.setString(str);

    return text;
}

std::unique_ptr<sf::RectangleShape> CreateRectangle(float width, float height, const sf::Color& color, float setXPos, float setYPos)
{
    std::unique_ptr<sf::RectangleShape> rectangle(new sf::RectangleShape);

    rectangle->setSize(sf::Vector2f(width, height));
    rectangle->setFillColor(color);
    rectangle->setPosition(sf::Vector2f(setXPos, setYPos));
    rectangle->setOrigin(sf::Vector2f(rectangle->getSize().x / 2, rectangle->getSize().y / 2));

    return rectangle;
}


int main()
{
    sf::RenderWindow window(sf::VideoMode(1280, 720), "SFML Feature Testing");
    window.setFramerateLimit(60);

    sf::Font Arial;
    Arial.loadFromFile("Resources/Fonts/arial.ttf");

    std::ostringstream oss;
    std::istringstream iss;

    float windowCenterX{ window.getSize().x / 2.0f };
    float windowCenterY{ window.getSize().y / 2.0f };

    sf::Text MouseXText{ CreateText(Arial,  32, sf::Color::White, 0.0f, 0.0f, "Mouse X Position: ") };
    sf::Text MouseXValue{ CreateText(Arial, 32, sf::Color::White, 0.0f, 0.0f, "Mouse X Value: ") };
    sf::Text MouseYText{ CreateText(Arial,  32, sf::Color::White, 0.0f, 0.0f, "Mouse Y Pos: ") };
    sf::Text MouseYValue{ CreateText(Arial, 32, sf::Color::White, 204, 30,    "Mouse Y Value : ") };


    MouseXValue.setPosition(sf::Vector2f(MouseXText.getPosition().x + MouseXText.getGlobalBounds().width, 0.0f));
    MouseYText.setPosition(sf::Vector2f(0, MouseXText.getPosition().y + MouseXText.getGlobalBounds().height + 5));


    //Center Square
    auto square{ CreateRectangle(300, 300, sf::Color::White, windowCenterX, windowCenterY) };

    float squareLeft{ };
    float squareTop{ };
    float squareRight{ };
    float squareBottom{ };

    //Squares
    auto cornerSquare_1 { CreateRectangle(35, 35, sf::Color::Blue,  0, 0) };
    auto cornerSquare_2 { CreateRectangle(35, 35, sf::Color::Cyan,  0, 0) };
    auto cornerSquare_3 { CreateRectangle(35, 35, sf::Color::Green, 0, 0) };
    auto cornerSquare_4 { CreateRectangle(35, 35, sf::Color::Red,   0, 0) };


    int playerX{ 150 };
    int playerY{ 150 };

    //Player
    auto player{ CreateRectangle(32, 32, sf::Color::Yellow, playerX, playerY) };

    float playerLeft{ };
    float playerTop{ };
    float playerRight{ };
    float playerBottom{ };

    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
            {
                window.close();
            }

            if (event.type == sf::Event::Resized)
            {
                window.setView(sf::View(sf::FloatRect(0.0f, 0.0f, static_cast<float>(event.size.width), static_cast<float>(event.size.height))));
                square->setPosition(sf::Vector2f(window.getSize().x / 2, window.getSize().y / 2));
            }
        }

        oss << sf::Mouse::getPosition(window).x;

        MouseXValue.setString(oss.str());

        oss.str("");

        oss << sf::Mouse::getPosition(window).y;

        MouseYValue.setString(oss.str());

        oss.str("");


        /*std::cout << "Player X Position: " << player->getPosition().x << &#39;\n&#39;;
        std::cout << "Player Y Position: " << player->getPosition().y << &#39;\n&#39;;*/

        std::cout << "Player X Left Side:  " << player->getPosition().x - player->getOrigin().x << &#39;\n&#39;;
        std::cout << "Player Y Top:        " << player->getPosition().y - player->getOrigin().y << &#39;\n&#39;;
        std::cout << "Player X Right Side: " << player->getPosition().x + player->getOrigin().x << &#39;\n&#39;;
        std::cout << "Player Y Bottom:     " << player->getPosition().y + player->getOrigin().y << &#39;\n&#39;;

        if (   sf::Mouse::getPosition(window).x >= square->getPosition().x - square->getOrigin().x
            && sf::Mouse::getPosition(window).x <= square->getPosition().x + square->getOrigin().x
            && sf::Mouse::getPosition(window).y >= square->getPosition().y - square->getOrigin().y
            && sf::Mouse::getPosition(window).y <= square->getPosition().y + square->getOrigin().y
            )
        {
            std::cout << "Within white square\n";
        }

        playerLeft = player->getPosition().x - player->getOrigin().x;
        playerTop = player->getPosition().y - player->getOrigin().y;
        playerRight = player->getPosition().x + player->getOrigin().x;
        playerBottom = player->getPosition().y + player->getOrigin().y;

        squareLeft = square->getPosition().x - square->getOrigin().x;
        squareTop = square->getPosition().y - square->getOrigin().y;
        squareRight = square->getPosition().x + square->getOrigin().x;
        squareBottom = square->getPosition().y + square->getOrigin().y;

        if (sf::Keyboard::isKeyPressed(sf::Keyboard::W))
        {
            if (playerTop >= squareBottom)
            {
                player->move(0, -5);
            }
        }

        if (sf::Keyboard::isKeyPressed(sf::Keyboard::A))
        {
            if (playerLeft <= squareRight)
            {
                player->move(-5, 0);
            }
        }

        if (sf::Keyboard::isKeyPressed(sf::Keyboard::S))
        {
            if (playerBottom <= squareTop)
            {
                player->move(0, 5);
            }
        }

        if (sf::Keyboard::isKeyPressed(sf::Keyboard::D))
        {
            if (playerRight >= squareLeft)
            {
                player->move(5, 0);
            }
        }

        //Set cornerSquare to one corner.
        //Bottom Right (Blue)
        cornerSquare_1->setPosition(sf::Vector2f(square->getPosition().x + square->getOrigin().x + cornerSquare_1->getOrigin().x, square->getPosition().y + square->getOrigin().y + cornerSquare_1->getOrigin().y));

        //Top Left (Cyan)
        cornerSquare_2->setPosition(sf::Vector2f(square->getPosition().x - square->getOrigin().x - cornerSquare_2->getOrigin().x, square->getPosition().y - square->getOrigin().y - cornerSquare_2->getOrigin().y));

        //Top Right (Green)
        cornerSquare_3->setPosition(sf::Vector2f(square->getPosition().x + square->getOrigin().x + cornerSquare_3->getOrigin().y, square->getPosition().y - square->getOrigin().y - cornerSquare_3->getOrigin().y));

        //Bottom Left (Red)
        cornerSquare_4->setPosition(sf::Vector2f(square->getPosition().x - square->getOrigin().x - cornerSquare_4->getOrigin().y, square->getPosition().y + square->getOrigin().y + cornerSquare_4->getOrigin().y));
       
        window.clear();
        window.draw(MouseXText);
        window.draw(MouseXValue);
        window.draw(MouseYText);
        window.draw(MouseYValue);
        window.draw(*player);
        window.draw(*square);
        window.draw(*cornerSquare_1);
        window.draw(*cornerSquare_2);
        window.draw(*cornerSquare_3);
        window.draw(*cornerSquare_4);
        window.display();
    }

    return 0;
}

2

General / Can this collision code be simplified?

« on: May 27, 2022, 01:20:15 pm »

So i have been watching tutorials on SFML and this guy made these tutorials for collision, so I followed along and he said there could be better alternatives out there so im wondering, is there better cleaner/easier to read collision code for everything under the General Collision section or is this pretty much it?

Heres the tutorials i was following:

Part 1:
Part 2:
Part 3:
Part 5:

#include <SFML/Graphics.hpp>
#include <iostream>
#include <vector>

using std::cout;
using std::vector;

int main()
{
    const unsigned WINDOW_WIDTH{ 800 };
    const unsigned WINDOW_HEIGHT{ 600 };

    sf::RenderWindow window(sf::VideoMode(WINDOW_WIDTH, WINDOW_HEIGHT), "SFML works!");
    window.setFramerateLimit(60);

    float dt;
    sf::Clock dtClock;

    const float gridSize = 50.0f;

    //Player
    const float movementSpeed = 100.f;
    sf::Vector2f velocity;
    sf::RectangleShape player;
    player.setFillColor(sf::Color::Green);
    player.setSize(sf::Vector2f(gridSize, gridSize));
    player.setPosition(sf::Vector2f(0, 0));

    //Walls
    std::vector<sf::RectangleShape> walls;

    sf::RectangleShape wall;
    wall.setFillColor(sf::Color::Red);
    wall.setSize(sf::Vector2f(gridSize, gridSize));
    wall.setPosition(gridSize * 5, gridSize * 2);

    walls.push_back(wall);

    //Collision
    sf::FloatRect nextPos;

    while (window.isOpen())
    {
        dt = dtClock.restart().asSeconds();

        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();

            //Prevents contents of window from being stretched
            if (event.type == sf::Event::Resized)
            {
                // update the view to the new size of the window
                sf::FloatRect visibleArea(0, 0, event.size.width, event.size.height);
                window.setView(sf::View(visibleArea));
            }
        }

        //Player Movement

        velocity.x = 0.f;
        velocity.y = 0.f;

        if (sf::Keyboard::isKeyPressed(sf::Keyboard::W))
        {
            velocity.y += -movementSpeed * dt;
        }
        if (sf::Keyboard::isKeyPressed(sf::Keyboard::A))
        {
            velocity.x += -movementSpeed * dt;
        }
        if (sf::Keyboard::isKeyPressed(sf::Keyboard::S))
        {
            velocity.y += movementSpeed * dt;
        }
        if (sf::Keyboard::isKeyPressed(sf::Keyboard::D))
        {
            velocity.x += movementSpeed * dt;
        }

        //General Collision
        for (auto& wall : walls)
        {
            sf::FloatRect playerBounds = player.getGlobalBounds();
            sf::FloatRect wallBounds = wall.getGlobalBounds();

            nextPos = playerBounds;
            nextPos.left += velocity.x;
            nextPos.top += velocity.y;

            if (wallBounds.intersects(nextPos))
            {
                //Bottom Collision
                if (playerBounds.top < wallBounds.top
                    && playerBounds.top + playerBounds.height < wallBounds.top + wallBounds.height
                    && playerBounds.left < wallBounds.left + wallBounds.width
                    && playerBounds.left + playerBounds.width > wallBounds.left)
                {
                    velocity.y = 0;
                    player.setPosition(playerBounds.left, wallBounds.top - playerBounds.height);
                }

                //Top Collision
                if (playerBounds.top > wallBounds.top
                    && playerBounds.top + playerBounds.height > wallBounds.top + wallBounds.height
                    && playerBounds.left < wallBounds.left + wallBounds.width
                    && playerBounds.left + playerBounds.width > wallBounds.left)
                {
                    velocity.y = 0;
                    player.setPosition(playerBounds.left, wallBounds.top + wallBounds.height);
                }

                //Right Collision
                if (playerBounds.left < wallBounds.left
                    && playerBounds.left + playerBounds.width < wallBounds.left + wallBounds.width
                    && playerBounds.top < wallBounds.top + wallBounds.height
                    && playerBounds.top + playerBounds.height > wallBounds.top)
                {
                    velocity.x = 0;
                    player.setPosition(wallBounds.left - playerBounds.width, playerBounds.top);
                }

                //Left Collision
                if (playerBounds.left > wallBounds.left
                    && playerBounds.left + playerBounds.width > wallBounds.left + wallBounds.width
                    && playerBounds.top < wallBounds.top + wallBounds.height
                    && playerBounds.top + playerBounds.height > wallBounds.top)
                {
                    velocity.x = 0;
                    player.setPosition(wallBounds.left + wallBounds.width, playerBounds.top);
                }
            }
        }

        player.move(velocity);

        //Screen Collision

        //Left Collision
        if (player.getPosition().x < 0.0)
        {
            player.setPosition(0, player.getPosition().y);
        }

        //Top Collision
        if (player.getPosition().y < 0)
        {
            player.setPosition(player.getPosition().x, 0);
        }

        //Right Collision
        if (player.getPosition().x + player.getGlobalBounds().width > window.getSize().x)
        {
            player.setPosition(window.getSize().x - player.getGlobalBounds().width, player.getPosition().y);
        }

        //Bottom Collision
        //Right Collision
        if (player.getPosition().y + player.getGlobalBounds().height > window.getSize().y)
        {
            player.setPosition(player.getPosition().x, window.getSize().y - player.getGlobalBounds().height);
        }

        window.clear();
        window.draw(player);

        for (auto& i : walls)
        {
            window.draw(i);
        }

        window.display();

    }

    return 0;
}

3

General / How to set SFML up for VS and not per project

« on: May 20, 2022, 07:59:30 pm »

So when i want to create an SFML project, I have to setup all the locations of the files and modules and its a pain because I like creating a lot of different projects to test things out and learn so for example I will make an SFML project where i just play around with time and getting familiar with SFML's time interface, and maybe another where i practice with loading textures and fonts etc, I dont want to have to keep creating projects and setting all this up each time, is there a way I can set it up once and then when i create a project i can just start using SFML right away? I could have sworn that this feature was available in an older VS but maybe im thinking of code blocks. any help would be appreciated. I'm using VS 2022 btw.

4

General / Will SFML work with Visual Studio 2022?

« on: May 13, 2022, 10:19:05 pm »

Its been quite a long time since i played around with SFML but I would like t6o start learning again so I downloaded it and got it working with VS 2022, im just wondering if there are any issues that might arise from this or if i should download 2017 and use it with that? or will 2022 be fine?

5

General discussions / How up to date are the books in the Learn section?

« on: February 12, 2021, 05:27:25 pm »

So it's been years and years and years since I last got into SFML. I think it was like SFML version 1.3 when i last tried it. I just got it working on VS 2019 and would like to buy some books but I see the books in the learn section were written in 2013-2017, are they still relevant to SFML's current release? like will i have a lot of trouble following them with the current version of SFML? if so, what books would you recommend?