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C++ Tutorial

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Re: C++ Tutorial

Flacko
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30.09.10 02:19:25

You will have to use a vector/pointers.

Re: C++ Tutorial

archmage
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30.09.10 04:06:09

I used a vector to hold a pointer to each instance of a class, but failed. Could you give me a small example?

Re: C++ Tutorial

Flacko
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30.09.10 04:16:34

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std::vector<yourclasstype>vec;
yourclasstype var1;
yourclasstype var2;
vec.push_back(var1);
vec.push_back(var2);
for(int i=0; i<vector.size(); i++)
{
	vector[i].a = 0;
}

Re: C++ Tutorial

archmage
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01.10.10 01:21:06

Thanks. I need to know what <<, >>, <<=, and >>= do.
Ex:

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short sqrt(short num) {
        short op = num;
        short res = 0;
        short one = 1 << 14; // The second-to-top bit is set: 1L<<30 for long
 
        // "one" starts at the highest power of four <= the argument.
        while (one > op)
            one >>= 2;
 
        while (one != 0) {
            if (op >= res + one) {
                op -= res + one;
                res = (res >> 1) + one;
            }
            else
              res >>= 1;
            one >>= 2;
        }
        return res;
    }

res = (res >> 1) + one;
one >>= 2;
short one = 1 << 14;

Edit:
Nvm I think I found it. Is it

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>>	n1/2^n2
<<	n1 * 2^n2

and the >>= and <<= just assign the values to variables. Correct?

1× editiert, zuletzt 01.10.10 01:34:04

Re: C++ Tutorial

Flacko
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01.10.10 03:04:52

Exactly, doing a >>= 2 is the same as doing a = a>>2. Just like when you do a+=5.
Here's more info: http://en.wikipedia.org/wiki/Bitwise_operation

Re: C++ Tutorial

Flacko
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03.10.10 00:15:25

Try:
std::cout << " 5 << 2 " << (5<<2);

I don't remember about code::blocks, I had it in my old computer which is lost almost forever

Re: C++ Tutorial

archmage
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03.10.10 00:31:48

Yeah that works. Which compiler do you use? Dev?

Re: C++ Tutorial

Flacko
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03.10.10 00:45:22

I use wxDev with GCC mingw 3.4.5 (VERY old) I might try to update it later...

Re: C++ Tutorial

archmage
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03.10.10 04:48:19

Is there a good, easy to use, compiler that does not have an IDE? So I write my code with something like n++ then open a command prompt type a few commands and that is all?

Re: C++ Tutorial

Lee
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03.10.10 05:46:34

Try mingw, my usual compilation steps consists of just a few steps:

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g++ -c a.cpp, b.cpp -I"include path"
g++ --shared a.o, b.o -L"library path" -lsomeLibrary

At its simplest however, we can reduce this to

g++ hello.cpp -ohello

Re: C++ Tutorial

archmage
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03.10.10 06:07:59

Lol I just found that. And I have a question. It says I need libgcc_s_dw2-1.dll with one of my compiled programs. All of my programs have worked until now. Des it have something to do with the fact that I have included libsfml-system.a to run an sfml program?

Re: C++ Tutorial

Lee
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03.10.10 07:15:53

That's completely normal. Programs linked against various major c++ libraries require this as a dependency, including but is not limited to: boost, QT, and sfml. Just drop the dll file into the running directory. I had the same exact issue while working on a project which linked against the QT-core library.

Re: C++ Tutorial

archmage
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03.10.10 20:22:16

Alright it owrks now, but is there a parameter to remove the console?

Re: C++ Tutorial

Flacko
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03.10.10 23:23:02

-mwindows or try -subsystem-windows

Re: C++ Tutorial

archmage
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03.10.10 23:28:48

Flacko hat geschrieben

-mwindows or try -subsystem-windows

Thanks, the first one worked. I have created this in SFML.
http://www.filefactory.com/file/b3c8g62/n/c_SFML1.6test010.7z

You can walk, run, and rotate on my desktop @ ~15:37:04

Notice the pink outline. Is there a way to remove it?

Re: C++ Tutorial

Lee
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03.10.10 23:31:21

*Sniff*
Our little Dark Bit is growing up so fast, he's finally becoming Dark Byte *sniff-and-wipes-nose*

Re: C++ Tutorial

archmage
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03.10.10 23:39:57

Lee hat geschrieben

*Sniff*
Our little Dark Bit is growing up so fast, he's finally becoming Dark Byte *sniff-and-wipes-nose*

lol

Re: C++ Tutorial

Flacko
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03.10.10 23:50:32

I'm having problems running it, could you statically link gcc and stdc++?
Just add -static-libgcc and -static-libstdc++

Re: C++ Tutorial

archmage
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04.10.10 00:42:48

Alright I will.
Here it is http://www.filefactory.com/file/b3c94bf/n/output.exe

Edit
The bullet image does not appear what is wrong?

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#include <cmath>
#include <vector>
#include <SFML/Graphics.hpp>
#include <SFML/Audio.hpp>

#define PI 3.1415926535

using namespace std;

template <class T>
T FindDistance(T x1, T x2, T y1, T y2)
{
	return sqrt( (x2 - x1)*(x2-x1) + (y2 - y1)*(y2-y1) );
}

class CBullet;
vector<CBullet*> CBullets;

int CBULLETCNT = 0;
sf::Image IMGBullet;

class CBullet
{
private:
	int id;
	float MAX_DIST, rot, sx, sy;
	bool force_destroy;
	
public:
	sf::Sprite Sprite;
	
	CBullet(float x, float y, float rot_)
	{
		CBullets.push_back(this);
		this->id = ++CBULLETCNT;
		this->MAX_DIST = 350.f;
		this->force_destroy = false;
		this->Sprite.SetImage(::IMGBullet);
		this->Sprite.SetX(x);
		this->sx = x;
		this->Sprite.SetY(y);
		this->sy = y;
		this->rot = rot_;
	}
	
	~CBullet()
	{
		CBullets.erase(CBullets.begin() + (this->id - 1));
		CBULLETCNT--;
	}
	
	void Update (void)
	{
		float X = this->Sprite.GetPosition().x;
		float Y = this->Sprite.GetPosition().y;
		if ( FindDistance<float> (X, sx, Y, sy) >= MAX_DIST )
		{
			CBullets.erase(CBullets.begin() + (this->id - 1));
			delete this;
		}
		
	//	this->Sprite.SetX( X + sin(rot) );
	//	this->Sprite.SetY( Y - cos(rot) );
		this->Sprite.SetX( X + 0.05 );
		this->Sprite.SetY( Y + 0.05 );
	}
		
} ;


int main()
{
	sf::Image IMGPlayer;
	sf::Image IMGCursor;
	sf::Image IMGBack;
	
	sf::SoundBuffer SNBShoot;
	
	sf::RenderWindow App(sf::VideoMode(800,600,32), "rotation test");
	
	App.ShowMouseCursor(false);
	
	sf::Clock CLKShoot;
	
	if ( !IMGPlayer.LoadFromFile("gfx/player.bmp") )
		App.Close();
	IMGPlayer.CreateMaskFromColor(sf::Color(255,0,255));
	
	if ( !IMGCursor.LoadFromFile("gfx/pointer.bmp") )
		App.Close();
	
	if ( !IMGBack.LoadFromFile("gfx/desktop.png") )
		App.Close();
	
	if ( !SNBShoot.LoadFromFile("sfx/elite.wav") )
		App.Close();
	
	if ( !IMGBullet.LoadFromFile("gfx/bullet.bmp") )
		App.Close();
	
	sf::Sound SNDShoot;
	SNDShoot.SetBuffer(SNBShoot);
	
	IMGCursor.CreateMaskFromColor(sf::Color(255,0,255));
	
	sf::Sprite SPRPlayer;
	sf::Sprite SPRCursor;
	sf::Sprite SPRBack;
	
	SPRPlayer.SetImage(IMGPlayer);
	SPRCursor.SetImage(IMGCursor);
	SPRBack.SetImage(IMGBack);
	
	SPRPlayer.SetSubRect(sf::IntRect(1,1,32,32));
	SPRCursor.SetSubRect(sf::IntRect(0,0,25,25));
	
	SPRPlayer.SetX(400);
	SPRPlayer.SetY(300);
	
	SPRPlayer.SetCenter(16.f, 16.f);
	SPRCursor.SetCenter(11.f, 11.f);
	
	sf::Vector2f Center(400, 300);
    sf::Vector2f HalfSize(400, 300);
	sf::View MainView(Center, HalfSize);
	CLKShoot.Reset();
	while ( App.IsOpened() )
	{
		sf::Event Event;
		while ( App.GetEvent(Event) )
		{
			if ( Event.Type == sf::Event::Closed )
				App.Close();
		}
		
		float Offset = 200.f*App.GetFrameTime();
		if ( App.GetInput().IsKeyDown(sf::Key::LShift) )
			Offset *= 0.35f;
		if ( App.GetInput().IsKeyDown(sf::Key::W) )
		{
			MainView.Move(0, -Offset);
			SPRPlayer.Move(0, -Offset);
		}
		if ( App.GetInput().IsKeyDown(sf::Key::A) )
		{
			MainView.Move(-Offset, 0);
			SPRPlayer.Move(-Offset, 0);
		}
		if ( App.GetInput().IsKeyDown(sf::Key::S) )
		{
			MainView.Move(0, Offset);
			SPRPlayer.Move(0, Offset);
		}
		if ( App.GetInput().IsKeyDown(sf::Key::D) )
		{
			MainView.Move(Offset, 0);
			SPRPlayer.Move(Offset, 0);
		}
		if ( App.GetInput().IsMouseButtonDown(sf::Mouse::Left) && CLKShoot.GetElapsedTime() >= SNBShoot.GetDuration() )
		{
			SNDShoot.Play();
			CBullet bullet(SPRPlayer.GetPosition().x, SPRPlayer.GetPosition().y, SPRPlayer.GetRotation());
			CLKShoot.Reset();
		}
		
		App.SetView(MainView);
		App.Clear();
		
		sf::Vector2f MousePos = App.ConvertCoords(App.GetInput().GetMouseX(), App.GetInput().GetMouseY());
		
		SPRCursor.SetX(MousePos.x);
		SPRCursor.SetY(MousePos.y);
		
		SPRPlayer.SetRotation( -(atan2(App.GetInput().GetMouseY()-300, App.GetInput().GetMouseX()-400) * 180 / PI + 90) );
		
		App.Draw(SPRBack);
		App.Draw(SPRPlayer);
		
		for ( int i = 0 ; i < CBullets.size(); i++ )
		{
			CBullets[i]->Update();
			App.Draw(CBullets[i]->Sprite);
		}
		
		App.Draw(SPRCursor);
		
		//App.SetView(App.GetDefaultView());
		
		App.Display();
	}
	
	return 0;
}

Edit
Click the link -> Epic Tic Tac Toe

Is it possible to not need all those DLLs?

4× editiert, zuletzt 08.10.10 02:46:55

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