Lists in C++ - GameCreators Forum

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Slow Target

16

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Joined: 10th Jan 2008

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Posted: 2nd Feb 2008 03:59

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I'm a novice... how do I handle a list of list of things?

I want to have a "plan", which is essentially a list of coordinates and routes (which is a list of coordinates). Ideally, there'd be some data paired with the points (probably desiged speed, start time, ??? )

It will have to be dynamic as I won't know how big the list could get, and I want the user to be able to build the plan buy adding points and routes to the plan.

TIA,

John

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Zotoaster

19

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Joined: 20th Dec 2004

Location: Scotland

Posted: 2nd Feb 2008 04:20

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Use a struct to make the coordinate data and use std::vector for the list of coords, so something like this:

+ Code Snippet


// Coordinate data
struct CoordXYZ
{

    CoordXYZ( float X, float Y, float Z ) : x(X), y(Y), z(Z)
    {
    }

    float x;
    float y;
    float z;

};


// Path data
std::vector<CoordXYZ> Path;


// Add waypoints
Path.push_back( CoordXYZ( 0.0f, 0.0f, 0.0f ) );
Path.push_back( CoordXYZ( 0.0f, 0.0f, 500.0f ) );
Path.push_back( CoordXYZ( -300.0f, 0.0f, 500.0f ) );
Path.push_back( CoordXYZ( -300.0f, 0.0f, 1000.0f ) );

To get each waypoint, use a for loop, and do Path[waypoint] to get the data. Of course, that will return a CoordXYZ type.

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Daggeth

17

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Joined: 3rd May 2007

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Posted: 4th Feb 2008 06:58

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Note: std::vector is just like an array, meaning you can access it using path[1], etc. Theres also a very good indepth tutorial on it in the MSN developer network dealy. Just search for "Vector Class Tutorial" under "Help->How do I?"

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