十字链表（C语言版本）

内容其实跟以前写的《十字链表的AOI算法实现》一样的，改一个C语言版本。

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

typedef struct DoubleNode {
    int roleId;
    int x;
    int y;
    struct DoubleNode* xPrev;
    struct DoubleNode* xNext;
    struct DoubleNode* yPrev;
    struct DoubleNode* yNext;
} DoubleNode;

typedef struct Scene {
    DoubleNode* _head;
    DoubleNode* _tail;
} Scene;


void _add_node(struct Scene* scene, DoubleNode* node);
void _leave_scene(DoubleNode* node);

// 初始化场景
struct Scene* new_scene();
// 进入场景
DoubleNode* enter_scene(struct Scene* scene, int roleId, int x, int y);
// 离开场景
void leave_scene(DoubleNode* node);
// 场景内移动
void role_move(struct Scene* scene, DoubleNode* node, int x, int y);
// 获取AOI
void get_aoi(struct Scene* scene, DoubleNode* node, int xAreaLen, int yAreaLen);
// --------------------------------------------------

struct Scene* new_scene() {
    struct Scene* scene = (struct Scene*)malloc(sizeof(struct Scene));
    DoubleNode* _head = (struct DoubleNode*)malloc(sizeof(struct DoubleNode));
    DoubleNode* _tail = (struct DoubleNode*)malloc(sizeof(struct DoubleNode));

    _head->roleId = _head->x = _head->y = 0;
    _tail->roleId = _tail->x = _tail->y = 0;

    _head->xPrev = _tail->xNext = NULL;
    _head->yPrev = _tail->yNext = NULL;
    _head->xNext = _head->yNext = _tail;
    _tail->xPrev = _tail->yPrev = _head;

    scene->_head = _head;
    scene->_tail = _tail;

    return scene;
}

DoubleNode* enter_scene(struct Scene* scene, int roleId, int x, int y) {
    DoubleNode* node = (DoubleNode*)malloc(sizeof(DoubleNode));
    node->roleId = roleId;
    node->x = x;
    node->y = y;

    _add_node(scene, node);
    return node;
}


void _add_node(struct Scene* scene, DoubleNode* node) {
    DoubleNode* cur = scene->_head->xNext;
    while(cur != NULL){
        if((cur->x > node->x) || cur == scene->_tail) {
            node->xNext = cur;
            node->xPrev = cur->xPrev;
            cur->xPrev->xNext = node;
            cur->xPrev = node;
            break;
        }
        cur = cur->xNext;
    }

    cur = scene->_head->yNext;
    while(cur != NULL){
        if((cur->y > node->y) || cur == scene->_tail) {
            node->yNext = cur;
            node->yPrev = cur->yPrev;
            cur->yPrev->yNext = node;
            cur->yPrev = node;
            break;
        }
        cur = cur->yNext;
    }
}

void _leave_scene(DoubleNode* node) {
    node->xPrev->xNext = node->xNext;
    node->yPrev->yNext = node->yNext;
    node->xNext->xPrev = node->xPrev;
    node->yNext->yPrev = node->yPrev;

    node->xPrev = node->xNext = NULL;
    node->yPrev = node->yNext = NULL;
}

void leave_scene(DoubleNode* node) {
    _leave_scene(node);
    free(node);
}

void print_scene(struct Scene* scene) {
    DoubleNode* cur = scene->_head->xNext;
    while(cur != scene->_tail) {
        printf("%d(%d, %d)\n", cur->roleId, cur->x, cur->y);
        cur = cur->xNext;
    }

    printf("\n");
    cur = scene->_head->yNext;
    while(cur != scene->_tail) {
        printf("%d(%d, %d)\n", cur->roleId, cur->x, cur->y);
        cur = cur->yNext;
    }
}

void role_move(struct Scene* scene, DoubleNode* node, int x, int y) {
    _leave_scene(node);
    node->x = x;
    node->y = y;
    _add_node(scene, node);
}

void get_aoi(struct Scene* scene, DoubleNode* node, int xAreaLen, int yAreaLen) {
    DoubleNode* cur = node->xNext;
    while(cur != scene->_tail){
        if(cur->x < node->x + xAreaLen){
            if(abs(cur->y - node->y) < yAreaLen){
                printf("aoi = %d(%d, %d)\n", cur->roleId, cur->x, cur->y);
            }
        }else{
            break;
        }
        cur = cur->xNext;
    }

    cur = node->xPrev;
    while(cur != scene->_tail){
        if(node->x < cur->x + xAreaLen){
            if(abs(cur->y - node->y) < yAreaLen){
                printf("aoi = %d(%d, %d)\n", cur->roleId, cur->x, cur->y);
            }
        }else{
            break;
        }
        cur = cur->xPrev;
    }
}

void main() {
    struct Scene* scene = new_scene();

    printf("\n== enter_scene == \n");
    enter_scene(scene, 1001, 1, 5);
    enter_scene(scene, 1002, 6, 6);
    enter_scene(scene, 1003, 3, 1);
    enter_scene(scene, 1004, 2, 2);
    struct DoubleNode* node1 = enter_scene(scene, 1005, 5, 4);
    struct DoubleNode* node2 = enter_scene(scene, 1006, 3, 3);

    print_scene(scene);

    printf("\n== leave_scene == \n");
    leave_scene(node1);
    print_scene(scene);


    printf("\n== role_move == \n");
    role_move(scene, node2, 2, 2);
    print_scene(scene);

    printf("\n== get_aoi == \n");
    get_aoi(scene, node2, 2, 2);
}