include stdlib include math include string include SDL include SDL_dra

#include <stdlib.h>
#include <math.h>
#include <string.h>
#include "SDL.h"
#include "SDL_draw.h"
#include "SDL_ttf.h"


const  int  width=1060, height=600, depth=16, beg_f=5 , end_f=15, ybeg=0, yend=3;

//график
void draw_func(SDL_Surface *screen, int diff){
    int x0=30 ,y0=400;
    double x=beg_f, res;

    for(int i=0; i<(width-60); i++){
        res=cos(x/12)/sin(x/12);
        y0=fabs(yend-res)*diff;
        x+=0.01;
        Draw_Pixel(screen,x0+i, y0+30,SDL_MapRGB(screen->format, 20,20,20));
    }
}

//рисуем график
void draw(SDL_Surface *screen, TTF_Font *fnt){
    int  n, diffx, diffy, x0=30, y0=30, x=beg_f;
    SDL_Surface *text_surface=NULL;
    char s[5];
    SDL_Color text_color{20, 20, 20};
    SDL_Rect dest{30,5, 1,1};

    n=end_f-beg_f;
    diffx=(width-60)/n;

    for(int i=0; i<=n; i++){
        Draw_VLine(screen,x0,y0, height-y0, SDL_MapRGB(screen->format, 200,200,200));
        x0+=diffx;
    }

    for(int i=0; i<=n; i++){
        itoa(x,s,10); // Преобразование  числа в  строку

        text_surface=TTF_RenderText_Solid(fnt,s, text_color);
        SDL_BlitSurface(text_surface, NULL, screen,&dest);
        dest.x+=diffx;
        x++;
    }


    n=yend-ybeg;
    diffy=(height - 60)/n;
    x0=30;

    for(int i=0; i<=n; i++){
        Draw_HLine(screen,x0,y0, width-x0, SDL_MapRGB(screen->format, 200,200,200));
        y0+=diffy;
    }

    x=ybeg;
    dest.x=15;
    dest.y=height-40;
    for(int i=0; i<=n; i++){
        itoa(x,s,10); // Преобразование  числа в  строку

        text_surface=TTF_RenderText_Solid(fnt,s, text_color);
        SDL_BlitSurface(text_surface, NULL, screen,&dest);
        dest.y-=diffy;
        x++;
    }


    draw_func(screen, diffy);
}
int main (int argc, char** argv)
{
    int  done=0;
    SDL_Event event;
    SDL_Rect rect={0,0,width, height};
    TTF_Font *fnt=NULL;


    if ( SDL_Init( SDL_INIT_VIDEO )< 0){
        printf( "Unable to init SDL: %s\n", SDL_GetError() );
        return 1;
    }

    if (TTF_Init()){
        printf( "Unable to init SDL_Font: %s\n", SDL_GetError() );
        return 1;
    }

    SDL_Surface* screen=SDL_SetVideoMode(width, height, depth,SDL_HWSURFACE|SDL_DOUBLEBUF);
    if (!screen ){
        printf("Unable to set SDL video: %s\n", SDL_GetError());
        TTF_Quit();
        SDL_Quit();
        return 1;
    }

    if(!(fnt=TTF_OpenFont("CharisSILR.ttf", 15))){
        printf("Unable to set Font: %s\n", SDL_GetError());
        TTF_Quit();
        SDL_Quit();
        return 3;
    }

    while (!done){
        while (SDL_PollEvent(&event)){
            switch (event.type){
                case SDL_QUIT:
                    done=1;
                    break;
                case SDL_KEYDOWN:{
                    if (event.key.keysym.sym==SDLK_ESCAPE)
                        done=1;
                    break;
                }
            }
        }

        SDL_FillRect(screen, &rect, SDL_MapRGB(screen->format, 255,255,255));
        draw(screen, fnt);

        SDL_Flip(screen);
    }

    SDL_FreeSurface(screen);
    TTF_CloseFont(fnt);
    TTF_Quit();
    SDL_Quit();
    return 0;
}