// Implementation of the RoadChunkList class
// CSE143 Spring '01
// Homework 6

#include "road_chunk_list.h"
#include <cstddef>

// Construct an empty list
RoadChunkList::RoadChunkList() {
	head = NULL;
}

// Destructor: delete all contained road chunk objects
RoadChunkList::~RoadChunkList() {
	Node *temp;
	while (head != NULL) {
		temp = head->next;
		delete head;
		head = temp;
	}
}

// Draw all contained objects.
void RoadChunkList::draw(GP142Display& gp) {
	Node *curr;
	for (curr = head; curr != NULL; curr = curr->next )
		curr->chunk->draw(gp);
}

// Update all contained objects.
void RoadChunkList::tick() {
	Node *curr;
	for (curr = head; curr != NULL; curr = curr->next )
		curr->chunk->tick();
}

// Prepend a new road chunk object to the list; the object must have been
// allocated using "new", and will be deleted when the destructor for this
// object is called.
void RoadChunkList::addRoadChunk(RoadChunk *newChunk) {
	Node *oldHead = head;
	head = new Node;
	head->chunk = newChunk;
	head->next = oldHead;
}