Elysian Shadows

Maevik wrote:If I have a class, and inside one of my class functions I wish to call a function that is part of my main code. How can I do this if my class is written as part of example.cpp and the function I want to call is part of main.cpp with the #include example.h ?

MarauderIIC wrote:I have something like

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class Game {
    Renderer renderer;
    vector<Object*> objects;
    void init();
    void handleInput();
    void update(); //Update positions
    void drawAll();
};

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class Object {
    int x, y;
    SDL_Surface* mySurface; //This is also an element in Renderer::loadedTextures
    public:
    SDL_Surface* getSurface();
};

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class Renderer {
    ...
    SDL_Surface* screen;
    SDL_Surface* background;
    const int SCREEN_WIDTH = 640;
    const int SCREEN_HEIGHT = 480;
    map<string, SDL_Surface*> loadedTextures;
    public:
    void draw(SDL_Surface* surf, int x, int y);
    void finishFrame();
    ~Renderer(); //This frees all the textures.
};

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void Game::drawAll() {
    for (vector<Object*>::iterator i = objects.begin(); i != objects.end(); ++i) {
        renderer.draw(i->getSurface(), i->getX(), i->getY());
    renderer.finishFrame();
}

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void Renderer::draw(SDL_Surface* surf, int x, int y) {
    SDL_Rect offset;
    offset.x = x;
    offset.y = y;

    SDL_BlitSurface(surf, NULL, screen, &offset);
}

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void Renderer::finishFrame() {
    SDL_Flip(screen);
    SDL_FillRect(screen, &screen->clip_rect, SDL_MapRGB(screen->format, 255, 255, 255)); //Reset
}

The game invokes the Renderer on all of its objects. Renderer does all the drawing. Then the game tells the renderer it's done sending objects, and the Renderer finishes. You could also pass the Renderer a list of objects and make it iterate through them, instead of one at a time, then it would know when it should wrap up the frame without the Game telling it to.

#pragma once
#include "SDL.h"
#include "SDL_image.h"
#include "SDL_ttf.h"
#include "SDL_mixer.h"
#include <string>
#include <vector>
#include "Renderer.h"

class Game
{
private:
	//Renderer rend;
public:
	Game(void);
	bool init();
	void input( SDL_Event* event , Renderer* rend );
	~Game(void);
};

error C2061: syntax error : identifier 'Renderer'	

Maevik wrote:So this just started working when I created a test class to see if it was happening with any other classes that I make members. So although I was still confused about what had happened and why, I continued on with my project. After about 10 minutes, it just stopped compiling again. The exact line I changed between successful compiles was adding this line ( and only this line ) to the Renderer class deconstructor

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SDL_FreeSurface( background );

Even after I removed the line it would not compile again. This doesn't make sense to me at all.

Ginto8 wrote:

Maevik wrote:So this just started working when I created a test class to see if it was happening with any other classes that I make members. So although I was still confused about what had happened and why, I continued on with my project. After about 10 minutes, it just stopped compiling again. The exact line I changed between successful compiles was adding this line ( and only this line ) to the Renderer class deconstructor

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SDL_FreeSurface( background );

Even after I removed the line it would not compile again. This doesn't make sense to me at all.

did you allocate background? That may be the problem.

Ginto8 wrote:

Maevik wrote:So this just started working when I created a test class to see if it was happening with any other classes that I make members. So although I was still confused about what had happened and why, I continued on with my project. After about 10 minutes, it just stopped compiling again. The exact line I changed between successful compiles was adding this line ( and only this line ) to the Renderer class deconstructor

Code: Select all

SDL_FreeSurface( background );

Even after I removed the line it would not compile again. This doesn't make sense to me at all.

did you allocate background? That may be the problem.