C / C++ / MFC Discussion Boards

S O S29-Dec-02 4:05

29-Dec-02 4:05

I am doing a map editor for a game.
The level is 1024x1024 tiles big, with each tile being 16 pixels with default zoom.
I am drawing the tiles by checking if each 64x64 tile portion of the map is visible(CDC::RectVisible) and if it is, I go through all the tiles and paint the ones that are visible(CDC::RectVisible again).
I BitBlt the tiles from a CDC that contains them all.
Then I just use lines to draw a grid over the 64x64 tile square.
Tilesets are generated at start for all zooms, so they're already avilable when drawing.

Now this works OK(45ms drawing. Hey, I use 350mhz Blush | :O

) with 100% zoom,
but with 25% zoom it is quite slow(110ms, altough it feels even slower)
Both are for totally empty map btw!
250ms for full map with 100%
1060ms for full map with 25% OMG | :OMG:

What could I optimize here? Or am I doing something majorly wrong with drawing it?

Re: Drawing optimization

Mike Nordell29-Dec-02 6:16

Mike Nordell

29-Dec-02 6:16

Make sure both your tiles and your off-screen bitmap is in video memory. If not, blitting will be slow.

The easiest way to ensure this I believe is to CreateCompatibleBitmap(GetDC(0), ...);

output format

wong190729-Dec-02 3:34

wong1907

29-Dec-02 3:34

hello
if "i","j" are double
i=1.2345678
j=2.345678

cout<

Re: output format

Joel Holdsworth29-Dec-02 4:07

Joel Holdsworth

29-Dec-02 4:07

printf("%.2f\n", i*j);

- I believe that should do the trick!

With time we live, with money we spend!
Joel Holdsworth.

Re: output format

wong190729-Dec-02 4:34

wong1907

29-Dec-02 4:34

If I prefer use cout rather than printf
how can I do???

THX!!! Big Grin | :-D

Re: output format

Dominik Reichl29-Dec-02 5:19

Dominik Reichl

29-Dec-02 5:19

char szTemp[256];
sprintf(szTemp, "%.2f\n", i*j);
cout << szTemp;

-Dominik

Re: output format

Michael Dunn29-Dec-02 5:26

Michael Dunn

29-Dec-02 5:26

You need to use an iomanip function. Unfortunately the VC 6 STL "documentation" is unhelpful, but something like:

cout << setprecision(2) << i*j;

should work. The horrible docs and the complexity of using iomanips is why printf() is favored for this type of output. Wink | ;)

--Mike--
If it doesn't move and it should: WD-40. If it moves and it shouldn't: duct tape.

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Re: output format

Nick Parker29-Dec-02 16:44

Nick Parker

29-Dec-02 16:44

Michael Dunn wrote:
You need to use an iomanip function. Unfortunately the VC 6 STL "documentation" is unhelpful

I didn't know that the iomanip header file was part of the STL.

Nick Parker

You see the Standards change. - Fellow co-worker

Re: output format

markkuk29-Dec-02 7:20

markkuk

29-Dec-02 7:20

#include <iostream>
#include <iomanip>

int main(int argc, char* argv[]) {
  double i = 1.2345678;
  double j = 2.345678;
  std::cout << std::fixed << std::setprecision(2)
	    << i * j << std::endl;
}

DrawObj!

HellShrimp4free28-Dec-02 21:42

HellShrimp4free

28-Dec-02 21:42

hi i need a brief tutorial about this Class.
thnx

Format of time

Shah Shehpori28-Dec-02 19:58

Shah Shehpori

28-Dec-02 19:58

Hi friends!!!

I've created a server application and want to get its "uptime". What i want is that whenever server starts, it gets the system time and store in variable/s.

Now i want my client to send request to get the server uptime. Whenever the request arrive at server, it checks the time when request arrive and subtract previously recorded time from it and send the difference back to the client. Obviously the time difference will be server's uptime.

But i want the server's uptime to be in the format of (days:hours:minutes:seconds). How can i do so ????

Re: Format of time

Mike Danberg29-Dec-02 15:17

Mike Danberg

29-Dec-02 15:17

Hi,

You can just use the CTime class to get that information. Then convert what you have into a string adding the ':' where you want it. Here's one example of how I use it to get the current date and store it in a CString.

CTime time = CTime::GetCurrentTime();
int month = time.GetMonth();
int day = time.GetDay();
int year = time.GetYear();

char tempMonth[50], tempDay[50], tempYear[50];
_itoa(month, tempMonth, 10);
_itoa(day, tempDay, 10);
_itoa(year, tempYear, 10);

CString sDate, sCurMonth, sCurYear;
CString sMonth, sDay, sYear;
sMonth = tempMonth;
sDay = tempDay;
sYear = tempYear;

sDate = sMonth + "/" + sDay + "/" + sYear;

Hope that helps you or at least points you in the right direction. Not sure on subtracting the time though.

Mike

Re: Format of time

Ravi Bhavnani29-Dec-02 16:51

Ravi Bhavnani

29-Dec-02 16:51

See CTimeSpan. You'll want to use its Format() method.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Norton style UI

Anonymous28-Dec-02 17:08

Anonymous

28-Dec-02 17:08

I want to make a program that uses an interface like the one found on Norton SystemWorks and Firewall. It will have to be able to open and save files, though. How should I make it? Should I use SDI or dialog, and what kinds of controls are those that give it the different pages? Thanks.

Program Filename and Executable?

Aidman28-Dec-02 16:27

Aidman

28-Dec-02 16:27

Hi all,

Is it possible for a program to get its own filename and path during run-time? Without calling the current directory function, because the current directory doesn’t necessarily have to be the same as the program directory. If so, then with what command or API function? Confused | :confused:

Let us presume a program already knows its own filename and path, either gotten it during run-time or has it as a constant. Now is it possible for the program to alter its own executable program file? I am sure that it won’t get write access but I can’t understand why, when the program is running from the memory it shouldn’t affect it-self during run-time and therefore shouldn’t affect the OS. Is there a function that could give access for altering an executed program file, that is or isn’t the calling programs own executable file? Confused | :confused:

Please forgive me for any typos... Blush | :O

Aidman » over and out

Re: Program Filename and Executable?

Michael Dunn28-Dec-02 16:57

Michael Dunn

28-Dec-02 16:57

Aidman wrote:
Is it possible for a program to get its own filename and path during run-time?

See the FAQ - How do I find the full path to my program's EXE file?

--Mike--
If it doesn't move and it should: WD-40. If it moves and it shouldn't: duct tape.

1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Re: Program Filename and Executable?

Aidman28-Dec-02 18:17

Aidman

28-Dec-02 18:17

Thanks Michael! Smile | :)

But what about editing the executable? Confused | :confused:

Aidman » over and out

Re: Program Filename and Executable?

Ted Ferenc28-Dec-02 21:53

Ted Ferenc

28-Dec-02 21:53

GetModuleFileName(NULL, &szFilepath, sizeof(szFilePath);

I have not looked at the FAQ but I assume it is in there. An FAQ is always a good starting point.

Re: Program Filename and Executable?

Aidman29-Dec-02 2:50

Aidman

29-Dec-02 2:50

huh?

I meant... what about the altering the data in the executable it-self?
Is it possible for a program to alter its own executable program file or another already executed program's executable file??? Confused | :confused:

hope you understod the question Blush | :O

Please reply anyone Cry | :((

Re: Program Filename and Executable?

Ted Ferenc29-Dec-02 3:23

Ted Ferenc

29-Dec-02 3:23

Yes you can alter the data in an EXE file, providing that you can open it for writing.

Re: Program Filename and Executable?

Dominik Reichl29-Dec-02 5:16

Dominik Reichl

29-Dec-02 5:16

Have a look at this article:

http://www.anticrack.de/modules.php?op=modload&name=News&file=article&sid=3196[^]

It is about self-deleting executables, but if you scroll to the section "The DELETE_ON_CLOSE method" you will find a method how to delete, or what you want: edit, your executable file.

Smile | :)

-Dominik

Thanks!

Aidman29-Dec-02 12:19

Aidman

29-Dec-02 12:19

Thanks Dominik! Smile | :)

This article is great, exactly what a needed, thanks again! Smile | :)

Aidman » over and out

Re: Program Filename and Executable?

(Steven Hicks)ⁿ⁺¹29-Dec-02 16:19

(Steven Hicks)ⁿ⁺¹

29-Dec-02 16:19

CFileFinder finder("Appname.exe");
finder.FindFile();
CString path=finder.GetFileFolder();

-Steven

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ChooseColor unhandled exception :(

haust28-Dec-02 12:32

haust

28-Dec-02 12:32

hi,

when i'm trying to create a ChooseColor dialog my app just crash and generated an unhandled exception.... then i've tryied to cretae a open filename dialog through GetOpenFileName and it worked. this is weird for me since both functions use commdlg.h and comdlg32.lib. i've initaliazed a very simple CHOOSECOLOR struct for my test :
static CHOOSECOLOR cc = {
sizeof(CHOOSECOLOR),
0,
0,
0,
0,
0,
0,
0,
0
};
any hint ?? thanks Smile | :)

haust

Re: ChooseColor unhandled exception :(

haust28-Dec-02 12:45

haust

28-Dec-02 12:45

ok,
forget it. i've just discovered (from an exemple on code project Smile | :)

) that the lpCustColors member from the CHOOSECOLOR struct _must_ be valid.... i _thought_ that is was _optional_, it was _not_ Wink | ;)

well, i guess i've learnt something once more 2day....

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