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objects.h
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objects.h
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//Copyright 2010 Sindre Johansen
//
//This file is part of Gravsim.
//
//Gravsim is free software: you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation, either version 3 of the License, or
//(at your option) any later version.
//Gravsim is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
//GNU General Public License for more details.
//You should have received a copy of the GNU General Public License
//along with Gravsim. If not, see <http://www.gnu.org/licenses/>.
#ifndef GUARD_OBJECTS_H
#define GUARD_OBJECTS_H
#include <string>
#include <vector>
#include "SDL.h"
#include "SDL_image.h"
#include "SDL_ttf.h"
#include "engine.h"
struct Derivative { //Takk til http://gafferongames.com/game-physics/integration-basics/
double dx;
double dy;
double dvx;
double dvy;
};
struct State {
double x;
double y;
double VelX;
double VelY;
double masse;
};
struct Vec {
double x;
double y;
};
class Planet {
private:
//double x,y; //midtpunkt
//double VelX, VelY; //Fart
double aX, aY; //Akselerasjon
int radius;
Bilde* bilde;
public:
State state;
Planet(Bilde* bilde);
void setPos(double x, double y);
void setVel(double x, double y);
void setMasse(double masse);
void setRadius(int radius);
//timeDelta er i Simulerings-sekunder
void move(int timeDelta);
void render(SDL_Surface* screen, GameState* state);
bool pointIsIn(int x, int y, GameState* state);
//Derivasjon for å få fart slik riktig
/*void integrate(const std::vector<Planet*> planets, double gravConst, double dt);
Derivative evaluate(double dt, const Derivative &d, const std::vector<Planet*> planets, double gravConst);
Vec acceleration(double x, double y, double VelX, double VelY, const std::vector<Planet*> planets, double gravConst);*/
};
//Derivasjon
std::vector<Derivative> evaluate(const std::vector<State> &initial, double dt, const std::vector<Derivative> &d, double gravConst);
std::vector<Vec> acceleration(const std::vector<State> &state, double gravConst);
void integrate(const std::vector<Planet*> &planets, double gravConst, double dt);
#endif