What is the best way to create a connection between trains and tracks?

Question

I am working on a project to visually track trains. I edited the object relationships between trains, tracks, and the corresponding drawing classes for several times, and I am not happy with any of them. Maybe you guys can help me here.

Here are the interfaces to the objects that I have.

Tracks:

• addControlPoint (IntPoint)
• getPointAtPosition (float positionOnTheCurve)
• getTangentAtPosition (float positionOnTheCurve)
• getMaxPosition ()

TrackDrawer:

• setGraphicsContext (Graphics g);
• draw (Track track);

A train:

• set / getTrack (track track)
• set / getTrackPosition (float position)
• set / getSpeed ​​(int speed)
• moveForward (elapsedTime)

TrainDrawer:

• setGraphicsContext (Graphics g)
• draw (train train)

.

init() {
    Tracks track = new Tracks();
    track.addPoint( point1 );
    track.addPoint( point2 );
    track.addPoint( point3 );  

    Train train = new Train();
    train.setTrack(track);
    train.setPosition(0);
}

run() {
   while (running) {
       elapsedTime = calcTime();
       update(elapsedTime);
       Graphics g = getGraphics();
       draw(g);
   }
}

update(long elapsedTime) {
    train.setSpeed(10);
    train.moveForward(elapsedTime);
}

draw(Graphics g) {
    trackDrawer.draw(track);
    trainDrawer.draw(train);
}

:

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Answer 1

, TrainDrawer TrackDrawer .

, Trains Tracks , . Draftsman ( "" ), .

Answer 2

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