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oib111
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 Posted: Wed Apr 30, 2008 9:00 pm Post subject: muldiv() explanation |
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I was wondering if anyone could explain these lines of code to me.
| Code: |
lfHeight = -MulDiv(12, GetDeviceCaps(hdc, LOGPIXELSY), 72);
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I sort of understand the MulDiv API, but not a lot. And I don't understand why he's putting the -MulDiv() instead of just MulDiv(), and what the 72 is for, and how he knew how to put it. Also...
| Code: |
f(hf)
{
DeleteObject(g_hfFont);
g_hfFont = hf;
}
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I get the if statement itself, but not the code in it. I mean, where does g_hFont come into play, I mean is it like a default font, and a pre-defined variable in Win32 or something?
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Snootae
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| Posted: Wed Apr 30, 2008 10:13 pm Post subject: |
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you really should link to the whole code, you gave me nothing, but i found it and figured it out
| Code: | | arf = CreateFont(lfHeight,0,0,0,0,TRUE,0,0,0,0,0,0,0,"Times New Roman"); |
he was using lfHeight to find a percent of space on the screen, to set his font's height (which he divided to his liking)
that must of slipped your eyes, he already declared it
and also
| Code: | if(hf) {
g_hfFont = hf;
} |
you added the other bit, wasn't in the code
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oib111
I post too much
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Posts: 2947
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| Posted: Thu May 01, 2008 8:45 am Post subject: |
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Nah....And still, why was he doing -MulDiv() instead of just MulDiv(), and how did he know to use 72. Or does it not matter?
http://www.winprog.org/tutorial/fonts.html
| Code: |
HFONT hf;
HDC hdc;
long lfHeight;
hdc = GetDC(NULL);
lfHeight = -MulDiv(12, GetDeviceCaps(hdc, LOGPIXELSY), 72);
ReleaseDC(NULL, hdc);
hf = CreateFont(lfHeight, 0, 0, 0, 0, TRUE, 0, 0, 0, 0, 0, 0, 0, "Times New Roman");
if(hf)
{
DeleteObject(g_hfFont);
g_hfFont = hf;
}
else
{
MessageBox(hwnd, "Font creation failed!", "Error", MB_OK | MB_ICONEXCLAMATION);
}
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cigs dont make people high, which weed does, which causes them to do bad stuff. like killing |
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HalfPrime
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| Posted: Thu May 01, 2008 2:59 pm Post subject: |
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I'm not sure why, but
| Code: | | -(GetDeviceCaps(hdc, LOGPIXELSY) * 12 / 72) |
Is what's used.
And I tihnk not declaring g_hffont is a typo. Look under choosing fonts, he declares it there.
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oib111
I post too much
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| Posted: Thu May 01, 2008 3:16 pm Post subject: |
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Well. Well how do you know to divide by 72?
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| 8D wrote: |
cigs dont make people high, which weed does, which causes them to do bad stuff. like killing |
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HalfPrime
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| Posted: Thu May 01, 2008 3:18 pm Post subject: |
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I don't know, but that's what you always do.
GetDeviceCaps(hdc, LOGPIXELSY) gets you pixels/inch. a font hight of that*12/72 gives you 6 lines per inch. I'm guessing that 12 and 72 mean something, but all it's really doing is setting how big you want it, so you can set it to whatever you want.
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oib111
I post too much
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| Posted: Thu May 01, 2008 4:16 pm Post subject: |
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Well still the last question, why the -MultDiv() instead of just MultDiv()?
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| 8D wrote: |
cigs dont make people high, which weed does, which causes them to do bad stuff. like killing |
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HalfPrime
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| Posted: Thu May 01, 2008 4:20 pm Post subject: |
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It has to be negative...that's just how it is. I haven't messed around with fonts too much, so I couldn't tell you why they did it like that, but that's just what they did.
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Noz3001
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| Posted: Thu May 01, 2008 4:33 pm Post subject: |
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= - means | Code: | | lfHeight = (lfHeight - MulDiv(12, GetDeviceCaps(hdc, LOGPIXELSY), 72)) |
Shorter i guess
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HalfPrime
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| Posted: Thu May 01, 2008 4:38 pm Post subject: |
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I thought the - had to be in front? I saw some other code with "0-getdev...".
http://msdn.microsoft.com/en-us/library/ms534214(VS.85).aspx
| Quote: | > 0 The font mapper transforms this value into device units and matches it against the cell height of the available fonts.
0 The font mapper uses a default height value when it searches for a match.
< 0 The font mapper transforms this value into device units and matches its absolute value against the character height of the available fonts. |
Makes sense
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