volcano_2022/source/utils.cpp

#include "utils.h"

// Calcula el cuadrado de la distancia entre dos puntos
double distanceSquared(int x1, int y1, int x2, int y2)
{
    int deltaX = x2 - x1;
    int deltaY = y2 - y1;
    return deltaX * deltaX + deltaY * deltaY;
}

// Detector de colisiones entre dos circulos
bool checkCollision(circle_t &a, circle_t &b)
{
    // Calcula el radio total al cuadrado
    int totalRadiusSquared = a.r + b.r;
    totalRadiusSquared = totalRadiusSquared * totalRadiusSquared;

    // Si la distancia entre el centro de los circulos es inferior a la suma de sus radios
    if (distanceSquared(a.x, a.y, b.x, b.y) < (totalRadiusSquared))
    {
        // Los circulos han colisionado
        return true;
    }

    // En caso contrario
    return false;
}

// Detector de colisiones entre un circulo y un rectangulo
bool checkCollision(circle_t &a, SDL_Rect &b)
{
    // Closest point on collision box
    int cX, cY;

    // Find closest x offset
    if (a.x < b.x)
    {
        cX = b.x;
    }
    else if (a.x > b.x + b.w)
    {
        cX = b.x + b.w;
    }
    else
    {
        cX = a.x;
    }

    // Find closest y offset
    if (a.y < b.y)
    {
        cY = b.y;
    }
    else if (a.y > b.y + b.h)
    {
        cY = b.y + b.h;
    }
    else
    {
        cY = a.y;
    }

    // If the closest point is inside the circle_t
    if (distanceSquared(a.x, a.y, cX, cY) < a.r * a.r)
    {
        // This box and the circle_t have collided
        return true;
    }

    // If the shapes have not collided
    return false;
}

// Detector de colisiones entre un dos rectangulos
bool checkCollision(SDL_Rect &a, SDL_Rect &b)
{
    // Calculate the sides of rect A
    int leftA = a.x;
    int rightA = a.x + a.w;
    int topA = a.y;
    int bottomA = a.y + a.h;

    // Calculate the sides of rect B
    int leftB = b.x;
    int rightB = b.x + b.w;
    int topB = b.y;
    int bottomB = b.y + b.h;

    // If any of the sides from A are outside of B
    if (bottomA <= topB)
    {
        return false;
    }

    if (topA >= bottomB)
    {
        return false;
    }

    if (rightA <= leftB)
    {
        return false;
    }

    if (leftA >= rightB)
    {
        return false;
    }

    // If none of the sides from A are outside B
    return true;
}

// Carga un archivo de imagen en una textura
bool loadTextureFromFile(LTexture *texture, std::string path, SDL_Renderer *renderer)
{
    bool success = true;
    if (!texture->loadFromFile(path, renderer))
    {
        printf("Failed to load %s texture!\n", path.c_str());
        success = false;
    }
    return success;
}

// Devuelve un color_t a partir de un string
color_t stringToColor(std::string str)
{
    color_t color = {0x00, 0x00, 0x00};
    if (str == "black")
    {
        color = {0x00, 0x00, 0x00};
    }
    else if (str == "light_black")
    {
        color = {0x3C, 0x35, 0x1F};
    }
    else if (str == "blue")
    {
        color = {0x31, 0x33, 0x90};
    }
    else if (str == "light_blue")
    {
        color = {0x15, 0x59, 0xDB};
    }
    else if (str == "red")
    {
        color = {0xA7, 0x32, 0x11};
    }
    else if (str == "light_red")
    {
        color = {0xD8, 0x55, 0x25};
    }
    else if (str == "purple")
    {
        color = {0xA1, 0x55, 0x89};
    }
    else if (str == "light_purple")
    {
        color = {0xCD, 0x7A, 0x50};
    }
    else if (str == "green")
    {
        color = {0x62, 0x9A, 0x31};
    }
    else if (str == "light_green")
    {
        color = {0x9C, 0xD3, 0x3C};
    }
    else if (str == "cyan")
    {
        color = {0x28, 0xA4, 0xCB};
    }
    else if (str == "light_cyan")
    {
        color = {0x65, 0xDC, 0xD6};
    }
    else if (str == "yellow")
    {
        color = {0xE8, 0xBC, 0x50};
    }
    else if (str == "light_yellow")
    {
        color = {0xF1, 0xE7, 0x82};
    }
    else if (str == "white")
    {
        color = {0xBF, 0xBF, 0xBD};
    }
    else if (str == "light_white")
    {
        color = {0xF2, 0xF1, 0xED};
    }
    return color;
}