How format and draw variables on screen

[Morganolla]

Hi. I'm beginer. How can I format and output my variables (int, float, ets.) on screen. ( Like printf(" MyInt= %i", MyInt) )
I could not find this item in Tutorials.

[Kingdom of Fish]

If you are using C++ look at stringstreams.

[Morganolla]

Wow, so complex?  :shock:  Any examples?

[Hiura]

Google is your friend.  :wink:

for example : http://www.cppreference.com/wiki/io/sstream/constructors

[Disch]

Here's a simple utility function:

Code: [Select]


template <typename T>
inline std::string tostring(const T& v)
{
    std::stringstream s;
    s << v;
    return s.str();
}


Use like this:

Code: [Select]


int myvariable = 150;

sf::String foo( "My variable is:  " + tostring(myvariable) );

mywindow.Draw(foo);


[Nexus]

If you concatenate a lot of different types in an expression, calling ToString() for each can become tedius. There is an alternative:

Code: [Select]

#include <sstream>

class MakeString
{
public:
template <typename T>
MakeString& operator<< (const T& value)
{
myStream << value;
return *this;
}

operator std::string() const
{
return myStream.str();
}

private:
std::stringstream myStream;
};

int main()
{
std::string str = MakeString() << "The image has width " << 407 << " and height " << 588 << ".";
}

[Disch]

Yeah that's much better than my approach.

Plus added benefit of being able to use iomanip stuff like setw(), etc.

[Nexus]

Yeah that's much better than my approach.

I wouldn't say it's always better. To convert single values, your code fits quite well.

By the way, boost::lexical_cast() is similar to your tostring(), but optimized for builtin types like int, double, etc. Only for the seldom case where speed matters that much.

[Disch]

I wouldn't say it's always better. To convert single values, your code fits quite well.

Yours would work just the same.  All it needs is a ctor that takes a templated argument.

By the way, boost::lexical_cast() is similar to your tostring(), but optimized for builtin types like int, double, etc. Only for the seldom case where speed matters that much.

I have so many mixed feelings about boost.

[Morganolla]

Thanks guys!
Here I try to compare HGE & SFML - my test ( http://www.forum.boolean.name/attachment.php?attachmentid=11305&d=1284841879)

On  my video card  ATI X600  I had HGE ~145fps and SFML ~150fps
How about yours? :lol:

[WitchD0ctor]

how many hairs are drawn in the sfml demo? i got about 300FPS on schools computer with the SFML demo, and about 150FPS when drawing 2000 hairs with HGE and 285, when drawing 1000

[Morganolla]

in SFML - 1000 hairs

[panithadrum]

Hmmm... I have exactly 1000 FPS in HGE (with 1000 hares) and 350 FPS in SFML.

I wonder why. I have i7-920 & GTX295.

[PeterWelzien]

(with 1000 hares)

That's a whole lot of bunnies!