map

[Joy Maitland]

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?
any example code ?

 

[Kai-Uwe Bux]

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?

[snip]

What about:

typedef int x_coordinate;
typedef int y_coordinate;

typedef std:air< x_coordinate, y_coordinate > cartesian_2d;
typedef std::map< cartesian_2d, imageID > image_map;



Best

Kai-Uwe Bux

 

[Joy Maitland]

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?

[snip]

What about:

typedef int x_coordinate;
typedef int y_coordinate;

typedef std:air< x_coordinate, y_coordinate > cartesian_2d;
typedef std::map< cartesian_2d, imageID > image_map;

do i use these template lke this:

cartesian_2d coord1 = (1,2);
cartesian_2d coord2 = (3,2);

image_map map1;
map1.add(coord1, 1);
map1.add(coord2, 3);

 

[Erik Wikström]

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?

[snip]

What about:

typedef int x_coordinate;
typedef int y_coordinate;

typedef std:air< x_coordinate, y_coordinate > cartesian_2d;
typedef std::map< cartesian_2d, imageID > image_map;

do i use these template lke this:

cartesian_2d coord1 = (1,2);
cartesian_2d coord2 = (3,2);

No, you have to use the make_pair() function:

cartesian_2d coord1 = make_pair(1,2);
cartesian_2d coord2 = make_pair(3,2);

 

[Juha Nieminen]

cartesian_2d coord1 = make_pair(1,2);
cartesian_2d coord2 = make_pair(3,2);

What's wrong with:

cartesian_2d coord1(1, 2);
cartesian_2d coord2(3, 2);

?