How to show float numbers?

[Zeno]

You mean a type-safe stream is a step backwards from a variable argument, buffer overflowing, type-ignorant, mark-up language?

-- Zeno

[This message has been edited by Zeno (edited 05-03-2002).]

[davepermen]

no he means that with all those new features added, simple formating of the output got lost (it _IS_ still possible, but not at all that nice as before..)

that is true..

[nickels]

Exactly. printf and sprintf are so immensly easy and efficient to use.
I tried to learn how to use the C++ formatters once and just laughed. It would take 1000 characters of code to do what takes 20 with sprintf.
I had a job where they tried to make me use that style of output and I quit, got a new job (not just because of that, but because of general C++ overzealous religousness).

[lgrosshennig]

JESUS!!!!

Sorry guys but you are really stressing a trivial issue.

Yes using streams is SAFE but you are buying it with a lot of overhead.

If you are doing a %1.5f sprintf on a char[256] buffer there is NO way you will EVER over run the buffer and its fast and easy too....

BTW: Knackered is right the width.precision only specifies the MININUM length of the result.

Regards,

LG

EDIT: Fixed some typo's

[This message has been edited by lgrosshennig (edited 05-03-2002).]

[ding]

my teachers,

Sorry!

I want to draw some objects with float numbers at (x,y,z). If using glListBase(1000); glRasterPos3f(x,y,z);glCallLists(Twidth,GL_UNSIGNE D_BYTE,Text);,I have to use own code to convert it to a string with finding a decimal position (_fcvt(...)).If using sprintf/printf(), I can't see the float numbers near objects drawed, namely I can't show the float numbers at given (x,y,z).

How to directly show float numbers at (x,y,z) in OpenGL with drawing objects?

thanks

[Aldacron]

You're misuberstanding the advice, ding

Used sprintf to format the output string (not printf!), then draw the formatted string using your existing calls.

Example:

char buffer[512];
sprintf (buffer, "%3.5f", output_string);

YourNormalDrawTextFunction(buffer);

You don't need to do anything special with OpenGL to draw floats. It's all about formatting the output.

[Michael Steinberg]

If you're totally into safety then you might wanna use _ecvt or however it is called, it returns a pointer to a static char array filled with the floating point number.

[zed]

>>(By the way, printf and sprintf are so incredible to use compared to C++ formatting statements. You want to talk about one major step backwards in the name of progress, this is it)<<

yeah i remember from when i started c++ in about 1996 (c in 1986/7) what struck me with c++.
the c++ way with formatting strings,
i thought it was a joke?
no i mean seriously!
i still think it nowadays, its a joke right?

btw i love c++

[Gorg]

I am not sure that :

ostringstream os;
float t;

os << fixed() << setw(3) << setPrecision(2) << t;

is weirder or uglier than

char buffer[256];
sprintf( buffer, "%3.2f", &t );

I will admit it is longer to type though.



[This message has been edited by Gorg (edited 05-05-2002).]

[Evil-Dog]

humm....I have something to say to this non-opengl debate hehehe

When I started learning c++ and used nothing of the printf family i thought that it was great.

But when I discovered that I could use sprintf and printf and all that stuff, I said to myself "f*ck the c++ text formatting method it's ugly" ! hahaha

maybe(probably) it's more safe though....
well...I love risks...

-------------------------------------------
Evil-Dog
*Let's have a funny day*