Messages

46

Graphics / Drawable.GetPosition()

« on: April 17, 2009, 05:37:39 am »

I've moved the initialization to the constructor, but now I'm not quite sure how to write this:

Code: [Select]


float GetX() {
    return ( self.GetPosition().x );
}

...considering it isn't returning a float type. I checked the source and it seems I should be using const Vector2f but it doesn't work.

47

Graphics / Drawable.GetPosition()

« on: April 17, 2009, 01:08:41 am »

Now, I'm getting the following error after trying to write the shape as a class:

Code: [Select]


C:\Users\BarrogaTravels\Desktop\Pong\Engine.h|6|error: `sf::Shape::Rectangle' cannot appear in a constant-expression|
C:\Users\BarrogaTravels\Desktop\Pong\Engine.h|6|error: a call to a constructor cannot appear in a constant-expression|
C:\Users\BarrogaTravels\Desktop\Pong\Engine.h|6|error: a function call cannot appear in a constant-expression|
C:\Users\BarrogaTravels\Desktop\Pong\Engine.h|6|error: invalid in-class initialization of static data member of non-integral type `const sf::Shape'|
C:\Users\BarrogaTravels\Desktop\Pong\Engine.h||In constructor `Paddle::Paddle(float, float)':|
C:\Users\BarrogaTravels\Desktop\Pong\Engine.h|11|error: `self' was not declared in this scope|
C:\Users\BarrogaTravels\Desktop\Pong\Engine.h|11|warning: unused variable 'self'|
C:\Users\BarrogaTravels\Desktop\Pong\Engine.h||In member function `void Paddle::Move(float, float)':|
C:\Users\BarrogaTravels\Desktop\Pong\Engine.h|15|error: `self' was not declared in this scope|
C:\Users\BarrogaTravels\Desktop\Pong\Engine.h|15|warning: unused variable 'self'|
C:\Users\BarrogaTravels\Desktop\Pong\Engine.h||In member function `void Paddle::SetX(float)':|
C:\Users\BarrogaTravels\Desktop\Pong\Engine.h|19|error: `self' was not declared in this scope|
C:\Users\BarrogaTravels\Desktop\Pong\Engine.h|19|warning: unused variable 'self'|
C:\Users\BarrogaTravels\Desktop\Pong\Engine.h||In member function `void Paddle::SetY(float)':|
C:\Users\BarrogaTravels\Desktop\Pong\Engine.h|23|error: `self' was not declared in this scope|
C:\Users\BarrogaTravels\Desktop\Pong\Engine.h|23|warning: unused variable 'self'|
C:\Users\BarrogaTravels\Desktop\Pong\main.cpp||In function `int main()':|
C:\Users\BarrogaTravels\Desktop\Pong\main.cpp|45|error: 'class Paddle' has no member named 'GetPosition'|
C:\Users\BarrogaTravels\Desktop\Pong\main.cpp|46|error: 'class Paddle' has no member named 'GetPosition'|
C:\Users\BarrogaTravels\Desktop\Pong\main.cpp|48|error: 'class Paddle' has no member named 'GetPosition'|
C:\Users\BarrogaTravels\Desktop\Pong\main.cpp|49|error: 'class Paddle' has no member named 'GetPosition'|
C:\Users\BarrogaTravels\Desktop\Pong\main.cpp|66|error: expected `)' before "App"|
C:\Users\BarrogaTravels\Desktop\Pong\main.cpp|67|error: no matching function for call to `sf::RenderWindow::Draw(Paddle&)'|
C:\Program Files\CodeBlocks\MinGW\bin\..\lib\gcc\mingw32\3.4.5\..\..\..\..\include\SFML\Graphics\RenderTarget.hpp|67|note: candidates are: virtual void sf::RenderTarget::Draw(const sf::Drawable&)|
C:\Users\BarrogaTravels\Desktop\Pong\main.cpp|68|error: no matching function for call to `sf::RenderWindow::Draw(Paddle&)'|
C:\Program Files\CodeBlocks\MinGW\bin\..\lib\gcc\mingw32\3.4.5\..\..\..\..\include\SFML\Graphics\RenderTarget.hpp|67|note: candidates are: virtual void sf::RenderTarget::Draw(const sf::Drawable&)|
C:\Users\BarrogaTravels\Desktop\Pong\main.cpp|52|warning: unused variable 'Factor'|
||=== Build finished: 15 errors, 5 warnings ===|


Disregard the "GetPosition" error.

Code: [Select]


class Paddle {
    private:
        sf::Shape self = sf::Shape::Rectangle( 0, 10, 100, sf::Color( 255, 255, 255 ) );

    public:
        Paddle();
        Paddle( float X, float Y ) {
            self.Move( X, Y );
        }

        void Move( float X, float Y ) {
            self.Move( X, Y );
        }

        void SetX( float X ) {
            self.SetX( X );
        }

        void SetY( float Y ) {
            self.SetY( Y );
        }
};


48

Graphics / Drawable.GetPosition()

« on: April 17, 2009, 12:53:09 am »

It should be zero. The fact that you put the points of your shape around (300, 400) doesn't move its origin from (0, 0). It's just not a good idea because you'll always have this offset.

Oh, okay. I think I get it. This makes perfect sense, thank you. The actual reason it is -7 is because I move the shape -7.

Thanks for the explanation.

49

Graphics / Drawable.GetPosition()

« on: April 16, 2009, 11:16:10 pm »

I've created a shape as follows:

Code: [Select]


sf::Shape Ball = sf::Shape::Circle( 400, 300, BallRadius, sf::Color( 255, 255, 255 ) ); //Ball


When I check the Y coordinate (writing to console) I get: -7

Shouldn't it be 300?

50

Window / Removing the console

« on: April 16, 2009, 04:34:32 pm »

P.S.
I wouldn't say that you would need to look in a "Basic C++ Tutorial" to learn how to link libraries.

For a beginner those tutorials are probably complex.

I learned because I needed 3 libraries to get a WinSock Network Library (39DLL) to work.

51

Window / Removing the console

« on: April 16, 2009, 02:42:01 am »

What do you mean by "link to sfml-main.lib".

I mean "link to sfml-main.lib". If you really don't know what this means, then I suggest you read some basic C++ tutorial first.

Also, what do you mean by "keep main as my entry point".

I mean that your entrey point is still the portable "main" and not an OS-specific one like "WinMain".

Okay, I get it.... but yeah, I know how to link.

52

Window / Removing the console

« on: April 15, 2009, 08:41:15 pm »

And to keep main as your entry point (instead of WinMain), you must link to sfml-main.lib.

What do you mean by "link to sfml-main.lib".

Also, what do you mean by "keep main as my entry point".

53

General / Flexible Object Manager

« on: January 14, 2009, 02:45:10 am »

e_barroga:
Please read the posts more carefully.

Using an object manager class, your code could look like as follows:

Code: [Select]


int main() {
  ObjectManager mgr;

  mgr.addObject( new MyObject ); // MyObject derived from BaseObject
  mgr.addObject( new MyOtherObject ); // MyOtherObject derived from BaseObject

  while( true ) { // Some kind of main loop.
    mgr.processObjects(); // Calls step() for every object.
  }
}


BaseObject has the virtual functions create() and step(). create() can be called in several ways: Either by the constructor or by ObjectManager::addObject(). ObjectManager::processObjects() iterates through all added objects and calls step() on each. I hope it's more clear this time.

Edit:
klusark:
You're implementing some kind of factory pattern. I would either prefer to implement functions like: createPlayer(), create...() instead of comparing type strings (we're using OOP ), or directly pass a pointer to the proper object by using the new statement.
For example something like:

Code: [Select]


objectmanager.register( ObjectFactory::createPlayer(), "an_unique_id" );


Yes, I already know about writing an object manager, but I am having issues writing the method to create instances through arguments.

Code: [Select]


void ObjectManager::addObject ( argument0 ) {
  new argument0;
}


How do I make it create an instance of whatever is defined in argument0?

54

General / Flexible Object Manager

« on: January 13, 2009, 03:35:14 am »

How would I properly execute this:

Code: [Select]



void instance_create ( name_of_object ) {
  name_of_object newInstance;
  instances.push_back( newInstance );
}


int main () {
  instance_create( o_ball );

  for ( int i=0; i<instances.size(); i++ ) {
    instances[i].Step();
  }
}

55

General / Flexible Object Manager

« on: January 11, 2009, 11:42:47 pm »

So you're saying that instead of writing virtual functions in the base class.... write the functions in a "manager class"?

How would I make that work, I don't completely understand.

The main reason I wish to make a base object class that has virtual functions:

Code: [Select]


virtual Create();
virtual Step();
virtual Destroy();


is so that I can add new object classes very simple. How would I get that to work if I made the Create, Step, Destroy methods for every derived objects in an "object manager" class?

56

General / Flexible Object Manager

« on: January 11, 2009, 04:32:33 am »

One thing that stumps is how to properly call the specific object when I want to create it:

Code: [Select]


instance_create( <name of object> ) {
  <name of object> newObj;
  instances.push_back( newObj );
}


I want to use it in the main loop like so:

Code: [Select]


instance_create( test );



Also.... when initializing the instance list, it doesn't seem to recognize the child objects. I did the following:

Code: [Select]


std::vector <base> instances;


I've created a child object:

Code: [Select]


class test: public base {
  public:
    void step() {
      std::cout << "Testing\n";
    }
};

Then I have the following in my main loop:

Code: [Select]


for (i=0; i<instances.size(); i++) {
  instances[i].step();
}

But it doesn't seem to work, so I changed the vector type for testing:

Code: [Select]


std::vector <test> instances;


And it outputs the text repeatedly, as I wanted.

57

General / Flexible Object Manager

« on: January 10, 2009, 03:04:08 am »

I need help writing an object manager.

I'm trying to make it extremely flexible so that content can be added easily.

Basically, I want to make an instance list so that SFML can loop through it and draw the instances at their coordinated places. I want to make a base object class, which is what SFML will be using for reference. This base object will have three virtual functions:

Code: [Select]


Create()

Step()

Destroy()

This way, I can easily write new object classes without messing with the engine in its entirety.

Code: [Select]


class baseObject {//The base Game Object

virtual Create();
virtual Step();
virtual Destroy();
};


class objBall: public baseObject {

void Create();
void Step();
void Destroy();
};



Then, I would just loop through the baseObject and it'll perform the Create, Step, and Destroy methods the way they're stated in the childs.

I'm having difficulty getting this to work, could I get some assistance?

Thanks.[/code]

58

General / Best Way to Handle Instances

« on: November 18, 2008, 09:48:54 pm »

I've gone through: www.cplusplus.com

I know stuff like pointers, classes, polymorphism, etc.

However, I think that the only way to truely know the language is by experience.... which you can't really get unless you dive into programming.

Also.... I understand the concepts of "scope" and the "scope operator> ::

59

General / Best Way to Handle Instances

« on: November 18, 2008, 04:48:58 pm »

I did something like this:

main.cpp

Code: [Select]


#include "Includes.h"

int main()
{
    GetInput();
}

Includes.h

Code: [Select]


#include "Get Input.h"

It says that "GetInput()" is not in this scope.

60

General / Best Way to Handle Instances

« on: November 18, 2008, 12:13:49 am »

So something like this:

Get Input.h

Code: [Select]


//Prevent Multiple Inclusions
#ifndef GET_INPUT_H
#define GET_INPUT_H

extern void GetInput();

#endif GET_INPUT_H


Get Input.cpp

Code: [Select]


void GetInput()
{
}


main.cpp

Code: [Select]


#include "Get Input.h"

int main()
{
GetInput();
}

Would that work, or am I supposed to include the "Get Input.cpp" file as well? If so, I do not understand how it would know to compile the ".cpp" file.