随手记——数据结构可视化（graphviz）

• 普通二叉树

 void writedot(BTree tree, FILE* fw)
    {
        if (tree == NULL)
            return;
        else{
            fprintf(fw, "%d [label = "<f0> | <f1> %d | <f2> " ];
", tree->data, tree->data);
        }
        if (tree->Left){
            fprintf(fw, "%d [label = "<f0> | <f1> %d | <f2> ",color = red];
", tree->Left->data, tree->Left->data);
            fprintf(fw, "%d:f0:sw -> %d:f1;
", tree->data, tree->Left->data);
        }
        if (tree->Right){
            fprintf(fw, "%d [label = "<f0> | <f1> %d | <f2> ",color = blue];
", tree->Right->data, tree->Right->data);
            fprintf(fw, "%d:f2:se -> %d:f1;
", tree->data, tree->Right->data);
        }
        writedot(tree->Left, fw);
        writedot(tree->Right, fw);
    }
    void BTreeVisual(BTree tree, char* filename){
        FILE *fw;
        if (NULL == (fw = fopen(filename, "w"))){
            printf("open file error");
            exit(0);
        }
        fprintf(fw, "digraph
");
        fprintf(fw, "{
");
        fprintf(fw, "node[shape = Mrecord, color = black]; 
"); 
        writedot(tree, fw);
        fprintf(fw, "}");
        fclose(fw);
    }

•  完全二叉树（下标从1开始）

void writedot(Bheap H,int index, FILE* fw)
{
    if (index > H->count)return;    
        fprintf(fw, "%d [label = "<f0> | <f1> %d | <f2> " ];
", H->data[index], H->data[index]);
        if (index*2 <= H->count) {
            fprintf(fw, "%d [label = "<f0> | <f1> %d | <f2> ",color = red];
", H->data[index*2], H->data[index*2]);
            fprintf(fw, "%d:f0:sw -> %d:f1;
", H->data[index], H->data[index*2]);
        }
        if (index*2+1 <= H->count) {
            fprintf(fw, "%d [label = "<f0> | <f1> %d | <f2> ",color = red];
", H->data[index * 2+1], H->data[index * 2+1]);
            fprintf(fw, "%d:f2:sw -> %d:f1;
", H->data[index], H->data[index * 2+1]);
        }
        writedot(H,index*2,fw);
        writedot(H, index * 2 + 1, fw);
}
void BHeapVisual(Bheap tree, char* filename) {
    FILE *fw;
    if (NULL == (fw = fopen(filename, "w"))) {
        printf("open file error");
        exit(0);
    }
    fprintf(fw, "digraph
");
    fprintf(fw, "{
");
    fprintf(fw, "node[shape = Mrecord, color = black]; 
");
    writedot(tree,1, fw);
    fprintf(fw, "}");
    fclose(fw);
}

 完全二叉树（下标从0开始）

void writedot(int* H, int index, FILE* fw,int length)
{
    if (index > length-1)return;
    fprintf(fw, "%d [label = "<f0> | <f1> %d | <f2> " ];
", H [index], H [index]);
    if (index * 2+1 <= length-1) {
        fprintf(fw, "%d [label = "<f0> | <f1> %d | <f2> ",color = red];
", H[index * 2 + 1], H[index * 2 + 1]);
        fprintf(fw, "%d:f0:sw -> %d:f1;
", H [index], H [index * 2+1]);
    }
    if (index * 2 + 2 <= length-1) {
        fprintf(fw, "%d [label = "<f0> | <f1> %d | <f2> ",color = blue];
", H [index * 2 + 2], H [index * 2 + 2]);
        fprintf(fw, "%d:f2:sw -> %d:f1;
", H [index], H [index * 2 + 2]);
    }
    writedot(H, index * 2 + 1, fw,length);
    writedot(H, index * 2 + 2, fw,length);
}
void BHeapVisual(int* tree, char* filename,int length) {
    FILE *fw;
    if (NULL == (fw = fopen(filename, "w"))) {
        printf("open file error");
        exit(0);
    }
    fprintf(fw, "digraph
");
    fprintf(fw, "{
");
    fprintf(fw, "node[shape = Mrecord, color = black]; 
");
    writedot(tree, 0, fw,length);
    fprintf(fw, "}");
    fclose(fw);
}

•  链表

void writedot1(LNode *L, FILE* fw)//单链表
{
    if (L == NULL)
        return;
    if (L->next) {
        fprintf(fw, "%d ->", L->data);
    }
    else {
        fprintf(fw, "%d;", L->data);
    }
    writedot1(L->next, fw);
}
void LinkListVisual(LinkList L, char* filename) {
    FILE *fw;
    if (NULL == (fw = fopen(filename, "w"))) {
        printf("open file error");
        exit(0);
    }
    fprintf(fw, "digraph
");
    fprintf(fw, "{
rankdir=LR;
");
    fprintf(fw, "node[shape =box, color = blue]; 
");
    writedot1(L.head, fw);
    fprintf(fw, "
}");
    fclose(fw);
}

• 有向连通图：

#pragma once
#include "top.h"

using namespace std;
class node;
class edge {
public:
    int weight;
    node *from, *to;
    edge(node *f, node *t, int weight = 0) {
        from = f;
        to = t;
        this->weight = weight;
    }
};
class node {
public:
    int data;//该节点的数据
    vector<node *>next;
    vector<edge *>edge;
    node(int data) {
        this->data = data;
    }
};
class Graph {
public:
    map<int, node *>Nodes;
    set<edge *>Edges;
    Graph(int en) {
        while (en--) {
            int from, to;
            cin >> from >> to;
            if (!Nodes[from]) {
                Nodes[from] = new node(from);
            }
            if (!Nodes[to]) {
                Nodes[to] = new node(to);
            }

            node *p = Nodes[from], *q = Nodes[to];
            edge *e = new edge(p, q);
            Edges.insert(e);
            p->next.push_back(q);
            p->edge.push_back(e);
        }
    }
    void BFS() {
        map<int, node* >::iterator it = Nodes.begin();
        node *n = it->second;
        queue<node *>q;
        set<node *>s;
        q.push(n); s.insert(n);
        while (!q.empty()) {
            node *n = q.front(); q.pop();
            cout << n->data << " ";
            for (int i = 0; i < n->next.size(); i++) {
                node *p = n->next[i];
                if (s.find(p) == s.end()) {
                    s.insert(p);
                    q.push(p);
                }
            }
        }

    }
};



void writedot1(Graph g, FILE* fw)
{
    map<int, node* >::iterator it = g.Nodes.begin();
    node *n = it->second;
    fprintf(fw, "%d [label = "%d" ];
", n->data, n->data);
    set<node *>s;
    queue<node *>q;
    s.insert(n);
    q.push(n);
    while (!q.empty()) {    
        n = q.front(); q.pop();
        for (int i = 0; i < n->next.size(); i++) {
            node *p = n->next[i];
            if (s.find(p) == s.end()) {
                s.insert(p);
                q.push(p);
                fprintf(fw, "%d [label = "%d" ];
", p->data, p->data);
            }
            fprintf(fw, "%d -> %d;
", n->data, p->data);
        }
    }

}
void GraphVisual(Graph g, char* filename) {
    FILE *fw;
    if (NULL == (fw = fopen(filename, "w"))) {
        printf("open file error");
        exit(0);
    }
    fprintf(fw, "digraph
");
    fprintf(fw, "{
");
    fprintf(fw, "node[shape = circle, color = black]; 
");
    writedot1(g, fw);
    fprintf(fw, "}");
    fclose(fw);
}

•  邻接表实现的有向图：

#include <iostream>
#include <map>
#include <queue>
#include <set>
using namespace std;

class  node {
public:
    int data;
    node* next;
    node(int d) {
        data = d;
        next = NULL;
    }
};

class AdjList {
public:
    map<int, node*> listhead;
    int  vexnum, edgenum;  // 顶点数，边数
    AdjList(int vn, int en) {
        vexnum = vn;
        edgenum = en;
        for (int i = 0; i < en; i++) {
            int from, to;
            cin >> from >> to;
            if (!listhead[from]) {
                listhead[from] = new node(from);
            }
            node *s = new node(to);
            //这里是为了有向图，某节点出度为0时，打印邻接表的时候会输出它
            if (!listhead[to]) {
                listhead[to] = new node(to);//这里和s不能用同一个
            }
            s->next = listhead[from]->next;
            listhead[from]->next = s;
        }
    }

    void BFS() {
        queue<node *>q;
        set<int>s;
        map<int, node*>::iterator it = listhead.begin();
        while (it != listhead.end()) {
            if (s.find(it->second->data) != s.end()) {
                it++;
                continue;
            }
            node *n = it->second;
            q.push(n);
            s.insert(n->data);
            cout << n->data << " ";
            while (!q.empty()) {
                node *p = q.front(); q.pop();
                while (p) {
                    if (s.find(p->data) == s.end()) {
                        cout << p->data << " ";
                        s.insert(p->data);
                        q.push(listhead[p->data]);
                    }
                    p = p->next;
                }
            }
            cout << endl;
        }
    }
};
typedef AdjList* Graph;

void print(Graph g) {
    map<int, node *>::iterator it = g->listhead.begin();
    while (it != g->listhead.end()) {
        node *p = it->second->next;
        cout << it->second->data << " ：";
        while (p) {
            cout << p->data << " ";
            p = p->next;
        }
        cout << endl;
        it++;
    }
}


void writedot1(Graph g, FILE* fw){
    map<int, node* >::iterator it = g->listhead.begin();
    while (it != g->listhead.end()) {
        node *n = it->second;
        fprintf(fw, "%d [label = "%d" ];
", n->data, n->data);
        it++;
    }
    it= g->listhead.begin();
    while (it != g->listhead.end()) {
        node *n = it->second;
        node *p = n->next;
        while (p) {
            fprintf(fw, "%d -> %d;
", n->data, p->data);
            p = p->next;
        }
            
        it++;
    }

}
void GraphVisual(Graph g, char* filename) {
    FILE *fw;
    if (NULL == (fw = fopen(filename, "w"))) {
        printf("open file error");
        exit(0);
    }
    fprintf(fw, "digraph
");
    fprintf(fw, "{
");
    fprintf(fw, "node[shape = circle, color = black]; 
");
    writedot1(g, fw);
    fprintf(fw, "}");
    fclose(fw);
}