player.h

#include <SDL/SDL.h>
#include <SDL/SDL_thread.h>
#include <iostream>
#include <vector>
#include <cstdlib>
#include <ctime>
#include <cmath>


using namespace std;

class Monster{
    public:
        Monster(const char* typeOfMob,bool boss,int x, int y);
        int calcDamage();
        void update(int delta,int playerX, int playerY, int chanx,int chany);

        bool hitPlayer;
    private:
        float mobSpeed;
        double posX,posY;
        int damageMax;
        int damageMin;
        bool isBoss;
        int deltaTime;
        SDL_Surface* mobImage;
};

Monster::Monster(const char* typeOfMob, bool boss, int x, int y)
{
    isBoss = boss;
    posX = x;
    posY = y;
    hitPlayer = false;

    if(typeOfMob == "goblin")
    {
        damageMin = 5;
        damageMax = 10;
        mobSpeed = 1.f;
        mobImage = SDL_LoadBMP("Content/Images/Player/up.bmp");
    }else
    {
        damageMin = 5;
        damageMax = 10;
        mobSpeed = 1.f; //I increase the speed
        mobImage = SDL_LoadBMP("Content/Images/Mobs/goblin.bmp");
    }

}

void Monster::update(int delta,int playerX, int playerY, int chanx,int chany)
{
        //pointing to the player
    double x=SDL_GetVideoSurface()->w/2-(playerX+posX);
    double y=SDL_GetVideoSurface()->h/2-(playerY+posY);

    //normalize
    double length=sqrt(x*x+y*y);
    x/=length;
    y/=length;

    //move on the vector
    posX+=x*mobSpeed;
    posY+=y*mobSpeed;

    SDL_Rect tmprect = {posX+playerX,posY+playerY}; //make sure the monster is static on the screen, by adding the camera coordinate to it's position

    SDL_BlitSurface(mobImage,NULL,SDL_GetVideoSurface(),&tmprect);
}

int Monster::calcDamage()
{
    return rand()%damageMax+damageMin;
}