mertani szorg

/*********************
Author: Nemeth Balint
*********************/

#include <SDL2/SDL.h>
#include <SDL2/SDL2_gfxPrimitives.h>
#include <math.h>
#include <stdlib.h>
#include <stdbool.h>

typedef struct Pontok{
    int x;
    int y;
}Pontok;
double distance(int pX, int pY, int x, int y);
bool kb_egyenlo(double arg, int dist, int eps);

//InfoC
void sdl_init(char const *felirat, int szeles, int magas, SDL_Window **pwindow, SDL_Renderer **prenderer) {
    if (SDL_Init(SDL_INIT_EVERYTHING) < 0) {
        SDL_Log("Nem indithato az SDL: %s", SDL_GetError());
        exit(1);
    }
    SDL_Window *window = SDL_CreateWindow(felirat, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, szeles, magas, 0);
    if (window == NULL) {
        SDL_Log("Nem hozhato letre az ablak: %s", SDL_GetError());
        exit(1);
    }
    SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_SOFTWARE);
    if (renderer == NULL) {
        SDL_Log("Nem hozhato letre a megjelenito: %s", SDL_GetError());
        exit(1);
    }
    SDL_RenderClear(renderer);

    *pwindow = window;
    *prenderer = renderer;
}

int main(int argc, char *argv[]) {
    //vars
    Pontok pontok[6] = {
            {320, 240},
            {240, 200},
            {420, 280},
            {240, 240},
            {400, 240},

    };
    int eps = 5;
    double d1, d2;

    // ablak létrehozása
    SDL_Window *window;
    SDL_Renderer *renderer;
    sdl_init("Azon pontok mertani helye", 640, 480, &window, &renderer);

    for (int x = 0; x < 640; x++) {
        for (int y = 0; y < 480; y++) {

            //CIRCLE
            d1 = distance(pontok[0].x, pontok[0].y, x, y);
            if (kb_egyenlo(d1, 200, eps)) {
                pixelRGBA(renderer, x, y, 255, 0, 0, 255);
            }

            //ELLIPSE
            d1 = distance(pontok[1].x, pontok[1].y, x, y);
            d2 = distance(pontok[2].x, pontok[2].y, x, y);
            if (kb_egyenlo(d1+d2, 250, eps)) {
                pixelRGBA(renderer, x, y, 0, 255, 0, 255);
            }

            //HYPERBOLE
            d1 = distance(pontok[3].x, pontok[3].y, x, y);
            d2 = distance(pontok[4].x, pontok[4].y, x, y);
            if (kb_egyenlo(fabs(d1-d2), 100, eps)) {
                pixelRGBA(renderer, x, y, 0, 0, 255, 255);
            }

            //PARABOLE
            d1 = distance(pontok[0].x, pontok[0].y, x, y);
            d2 = 400 - x;
            if (kb_egyenlo(d1-d2, 0, eps)) {
                pixelRGBA(renderer, x, y, 255, 255, 255, 255);
            }
        }
    }

    //NAMES
    stringRGBA(renderer, 550, 10, "Kor", 255, 0, 0, 255);
    stringRGBA(renderer, 550, 30, "Elipszis", 0, 255, 0, 255);
    stringRGBA(renderer, 550, 50, "Hiperbola", 0, 0, 255, 255);
    stringRGBA(renderer, 550, 70, "Parabola", 255, 255, 255, 255);


    /* az elvegzett rajzolasok a kepernyore */
    SDL_RenderPresent(renderer);

    /* varunk a kilepesre */
    SDL_Event ev;
    while (SDL_WaitEvent(&ev) && ev.type != SDL_QUIT) {
    }

    /* ablak bezarasa */
    SDL_Quit();

    return 0;
}

double distance(int pX, int pY, int x, int y) {
    return sqrt(pow(pX - x, 2) + pow(pY - y, 2));
}

bool kb_egyenlo(double arg, int dist, int eps){
    return (arg + eps >= dist && arg - eps<= dist);
}