导航是地图类项目实战中经常会遇到了。看上去貌似没头绪,其实是有模板遵循的。我们直接根据图看代码。
//MainWidget.h#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include "mapwidget.h"
#include <QToolButton>
#include <QGraphicsLineItem>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QLabel>
#include <QComboBox>
#include <QSpinBox>
#include <QTextEdit>
#include <QPainter>
#include <QVector>class MainWindow : public QMainWindow
{Q_OBJECT
public:MainWindow(QWidget *parent = 0);~MainWindow();void createToolBar();void paintEvent (QPaintEvent *);void setStart(int X, int Y);void setEnd(int X, int Y);void setNextPos (int index);void initScene();
public slots:void setStartStation();void setEndStation();void FindPath();void Clear();
private:MapWidget *mapWidget;QLabel *startLabel;QLabel *endLabel;QComboBox *startComboBox;QComboBox *endComboBox;QToolButton *findPathBtn;QToolButton *clearBtn;QGraphicsScene *scene;QGraphicsView *view;int startX, startY, endX, endY;QVector<int> nextPath;struct ArcCell{ //弧信息int adj; //对无权图有1,0表示是否相邻,对带权图,则为权值类型// string info; //该弧的相关信息};//内部类static const int MAX_VERTEX_NUM = 31;static const int INF = 999999;struct MGraph{QVector<int> vexs; //顶点集合//临接矩阵ArcCell arcs[MAX_VERTEX_NUM][MAX_VERTEX_NUM];int vexnum; //顶点数int arcnum; //边数// int kind; //图的类型};class DijkstraFindPath{public:DijkstraFindPath();MGraph mgraph;void CreateGraph();
// void ShortestPath(int v0, PathMatrix &path, ShortPathTable &DP, int prev[]);int prev[MAX_VERTEX_NUM]; //最短路上的前驱顶点int d[MAX_VERTEX_NUM]; //表示边e = (u,v)的权值(不存在时为INF,不过d[i][i]=0)bool used[MAX_VERTEX_NUM]; //已经使用过的图void dijkstra(int startPos); //求从起点startPos出发到各个顶点的最短距离QVector<int> get_Path(int endPos);//到顶点endPos的最短路};DijkstraFindPath *dj;
};#endif // MAINWINDOW_H
//MainWidget.cpp
//最短路径算法,和界面的实现#include "mainwindow.h"
#include <qdebug.h>
#include <QToolBar>
#include <QtAlgorithms>
#include <iostream>
MainWindow::MainWindow(QWidget *parent): QMainWindow(parent)
{
// mapWidget = new MapWidget;
// painter = new QPainter();dj = new MainWindow::DijkstraFindPath();dj->CreateGraph ();scene = new QGraphicsScene;scene->setSceneRect (-100, -100, 700, 700);initScene();view = new QGraphicsView;view->setScene (scene);view->setMinimumSize (800, 800);view->show ();setCentralWidget (view);createToolBar (); //实现一个工具栏
// setCentralWidget (mapWidget);
// setMinimumSize (600, 400); //设置最小尺寸
}
MainWindow::DijkstraFindPath::DijkstraFindPath()
{mgraph.vexnum = 31; //初始化点数目for (int i = 0; i < mgraph.vexnum; i++) //初始化点编号mgraph.vexs.push_back (i);mgraph.arcnum = 80; //暂定for (int i = 0; i < mgraph.vexnum; i++) {for (int j = 0; j < mgraph.vexnum; j++) {if (i == j)mgraph.arcs[i][j].adj = 0;elsemgraph.arcs[i][j].adj = INF;// mgraph.arcs[i][j].info = "";}}
}
void MainWindow::DijkstraFindPath::CreateGraph ()
{mgraph.arcs[0][1].adj = mgraph.arcs[1][0].adj = 45; //6 - 5mgraph.arcs[0][6].adj = mgraph.arcs[6][0].adj = 165; //6 - 10mgraph.arcs[1][2].adj = mgraph.arcs[2][1].adj = 45; //5 - 4mgraph.arcs[2][3].adj = mgraph.arcs[3][2].adj = 45; //4 - 3mgraph.arcs[3][4].adj = mgraph.arcs[4][3].adj = 45; //3 - 2mgraph.arcs[3][15].adj = mgraph.arcs[15][3].adj = 24; //3 - 22mgraph.arcs[4][5].adj = mgraph.arcs[5][4].adj = 45; //2 - 1mgraph.arcs[13][15].adj = mgraph.arcs[15][13].adj = 85;//23 - 22mgraph.arcs[0][13].adj = mgraph.arcs[13][0].adj = 55; //6 - 23mgraph.arcs[13][2].adj = mgraph.arcs[2][13].adj = 50; //23 - 4mgraph.arcs[5][11].adj = mgraph.arcs[11][5].adj = 65; //1 - 一食堂mgraph.arcs[11][12].adj = mgraph.arcs[12][11].adj = 10;//一食堂-操场mgraph.arcs[11][27].adj = mgraph.arcs[27][11].adj = 85;//一食堂-祁通1mgraph.arcs[27][28].adj = mgraph.arcs[28][27].adj = 85;//祁通1-祁通2(路口)mgraph.arcs[5][29].adj = mgraph.arcs[29][5].adj = 87; //一食堂-岔路口mgraph.arcs[29][9].adj = mgraph.arcs[9][29].adj = 80; //岔路-7mgraph.arcs[29][11].adj = mgraph.arcs[11][29].adj = 60;//一食堂到岔路(通向7号楼的)mgraph.arcs[29][30].adj = mgraph.arcs[30][29].adj = 32;//岔路-祁通大道mgraph.arcs[30][10].adj = mgraph.arcs[10][30].adj = 90;//祁通大道-图书馆mgraph.arcs[30][28].adj = mgraph.arcs[28][30].adj = 80;//祁通大道-祁通2mgraph.arcs[28][26].adj = mgraph.arcs[26][28].adj = 15;//祁通2-方肇周mgraph.arcs[25][27].adj = mgraph.arcs[27][25].adj = 273; //西大门-祁通1mgraph.arcs[27][28].adj = mgraph.arcs[28][27].adj = 184;//祁通1-祁通2
// mgraph.arcs[25][12].adj = mgraph.arcs[12][25].adj = 108; //西大门-西操mgraph.arcs[5][12].adj = mgraph.arcs[12][5].adj = 70; //1 - 操场mgraph.arcs[6][7].adj = mgraph.arcs[7][6].adj = 45; //10 - 9mgraph.arcs[7][8].adj = mgraph.arcs[8][7].adj = 45; //9 - 8mgraph.arcs[8][9].adj = mgraph.arcs[9][8].adj = 45; //8 - 7mgraph.arcs[9][10].adj = mgraph.arcs[10][9].adj = 150; //7 - 图书馆mgraph.arcs[6][14].adj = mgraph.arcs[14][6].adj = 140; //10 - 13mgraph.arcs[14][16].adj = mgraph.arcs[16][14].adj = 39;//13 - 12mgraph.arcs[14][17].adj = mgraph.arcs[17][14].adj = 39;//13 - 16mgraph.arcs[16][18].adj = mgraph.arcs[18][16].adj = 39;//12 - 15mgraph.arcs[17][18].adj = mgraph.arcs[18][17].adj = 39;//16 - 15mgraph.arcs[18][19].adj = mgraph.arcs[19][18].adj = 39;//15 - 14mgraph.arcs[17][20].adj = mgraph.arcs[20][17].adj = 137;//16 - 19mgraph.arcs[20][21].adj = mgraph.arcs[21][20].adj = 39; //19 - 18mgraph.arcs[21][22].adj = mgraph.arcs[22][21].adj = 39; //18 - 17mgraph.arcs[19][22].adj = mgraph.arcs[22][19].adj = 130;//14 - 17mgraph.arcs[22][23].adj = mgraph.arcs[23][22].adj = 53; //17 - 二超mgraph.arcs[23][24].adj = mgraph.arcs[24][23].adj = 5; //二超 - 二食堂mgraph.arcs[24][10].adj = mgraph.arcs[10][24].adj = 260;//二食堂-图书馆//以下处理细节mgraph.arcnum = 80;
}
void MainWindow::DijkstraFindPath::dijkstra (int startPos)
{for (int i = 0; i < mgraph.vexnum; i++) d[i] = INF;for (int i = 0; i < mgraph.vexnum; i++) used[i] = false;for (int i = 0; i < mgraph.vexnum; i++) prev[i] = -1;d[startPos] = 0;while (true) {int v = -1;for (int u = 0; u < mgraph.vexnum; u++) {if (!used[u] && (v == -1 || d[u] < d[v])) v = u;}if (v == -1) break;used[v] = true;for (int u = 0; u < mgraph.vexnum; u++) {if (d[u] > d[v] + mgraph.arcs[v][u].adj) {d[u] = d[v] + mgraph.arcs[v][u].adj;prev[u] = v;}}}
}
QVector<int> MainWindow::DijkstraFindPath::get_Path (int endPos)
{QVector<int> path;for ( ; endPos != -1; endPos = prev[endPos]) {
// std::cout << "EndPos: " << endPos << ", ";path.push_back (endPos);}std::reverse(path.begin (), path.end ());return path;
}
void MainWindow::initScene ()
{QGraphicsPixmapItem *item =scene->addPixmap (QPixmap("NanTong.jpg"));
// item->setFlag (QGraphicsItem::ItemIsMovable);item->setPos (-500, -420);
}
MainWindow::~MainWindow()
{
}
void MainWindow::createToolBar ()
{QToolBar *toolBar = addToolBar ("Tool");startLabel = new QLabel(tr("起点: "));startComboBox = new QComboBox;startComboBox->addItem (tr("公寓6号楼")); //0startComboBox->addItem (tr("公寓5号楼")); //1startComboBox->addItem (tr("公寓4号楼")); //2startComboBox->addItem (tr("公寓3号楼")); //3startComboBox->addItem (tr("公寓2号楼")); //4startComboBox->addItem (tr("公寓1号楼")); //5startComboBox->addItem (tr("公寓10号楼")); //6startComboBox->addItem (tr("公寓9号楼")); //7startComboBox->addItem (tr("公寓8号楼")); //8startComboBox->addItem (tr("公寓7号楼")); //9startComboBox->addItem (tr("图书馆")); //10startComboBox->addItem (tr("一食堂")); startComboBox->addItem (tr("西操场")); //11 12startComboBox->addItem (tr("公寓23号楼")); startComboBox->addItem (tr("公寓13号楼")); //13 14startComboBox->addItem (tr("公寓22号楼")); startComboBox->addItem (tr("公寓12号楼")); //15 16startComboBox->addItem (tr("公寓楼16")); startComboBox->addItem (tr("公寓楼15")); //17 18startComboBox->addItem (tr("公寓楼14")); startComboBox->addItem (tr("公寓楼19")); //19 20startComboBox->addItem (tr("公寓楼18")); startComboBox->addItem (tr("公寓楼17")); //21 22startComboBox->addItem (tr("二超")); startComboBox->addItem (tr("二食堂")); //23 24startComboBox->addItem (tr("西大门")); startComboBox->addItem (tr("方肇周教学楼")); //25 26endLabel = new QLabel(tr("\t终点: "));endComboBox = new QComboBox;endComboBox->addItem (tr("公寓6号楼"));endComboBox->addItem (tr("公寓5号楼"));endComboBox->addItem (tr("公寓4号楼"));endComboBox->addItem (tr("公寓3号楼"));endComboBox->addItem (tr("公寓2号楼"));endComboBox->addItem (tr("公寓1号楼"));endComboBox->addItem (tr("公寓10号楼"));endComboBox->addItem (tr("公寓9号楼"));endComboBox->addItem (tr("公寓8号楼"));endComboBox->addItem (tr("公寓7号楼"));endComboBox->addItem (tr("图书馆"));endComboBox->addItem (tr("一食堂")); endComboBox->addItem (tr("西操场"));endComboBox->addItem (tr("公寓23号楼"));endComboBox->addItem (tr("公寓13号楼"));endComboBox->addItem (tr("公寓22号楼"));endComboBox->addItem (tr("公寓12号楼"));endComboBox->addItem (tr("公寓楼16")); endComboBox->addItem (tr("公寓楼15"));endComboBox->addItem (tr("公寓楼14")); endComboBox->addItem (tr("公寓楼19"));endComboBox->addItem (tr("公寓楼18")); endComboBox->addItem (tr("公寓楼17"));endComboBox->addItem (tr("二超")); endComboBox->addItem (tr("二食堂"));endComboBox->addItem (tr("西大门")); endComboBox->addItem (tr("方肇周教学楼"));connect (startComboBox, SIGNAL(activated(int)), this, SLOT(setStartStation()));connect (endComboBox, SIGNAL(activated(int)), this, SLOT(setEndStation()));findPathBtn = new QToolButton;findPathBtn->setText (tr("\t\t绘制最短路径"));connect (findPathBtn, SIGNAL(clicked(bool)), this, SLOT(FindPath()));clearBtn = new QToolButton;clearBtn->setText (tr("\t\t清除"));connect (clearBtn, SIGNAL(clicked(bool)), this, SLOT(Clear()));toolBar->addWidget (startLabel);toolBar->addWidget (startComboBox);toolBar->addWidget (endLabel);toolBar->addWidget (endComboBox);toolBar->addWidget (findPathBtn);toolBar->addWidget (clearBtn);
}
void MainWindow::setStart(int X, int Y) {startX = X; startY = Y;
// qDebug() << X << ", " << Y;
}
void MainWindow::setEnd (int X, int Y)
{endX = X; endY = Y;
}
void MainWindow::setStartStation ()
{switch (startComboBox->currentIndex ()) {case 0:setStart(-660, -534); break;case 1:setStart (-673, -490); break;case 2:setStart (-682, -446); break;case 3:setStart (-690, -400); break;case 4:setStart (-701, -355); break;case 5:setStart (-711, -310); break;case 6:setStart (-457, -555); break;case 7:setStart (-449, -485); break;case 8:setStart(-446, -432); break;case 9:setStart (-451, -400); break;case 10:setStart (-347, -353); break;case 11:setStart (-720, -247); break;case 12:setStart (-789, -252); break;case 13:setStart (-721, -517); break;case 14:setStart (-271, -540); break;case 15:setStart (-721, -439); break;case 16:setStart (-274, -495); break;case 17:setStart (-180, -552); break;case 18:setStart (-178, -508); break;case 19:setStart (-179, -456); break;case 20:setStart (-73, -549); break;case 21:setStart (-56, -500); break;case 22:setStart (-59, -448); break;case 23:setStart (-94, -381); break;case 24:setStart (-69, -351); break;case 25:setStart (-1070, -92); break;case 26:setStart (-438, -125); break;case 27:setStart (-721, -119); break;case 28:setStart (-550, -122); break;case 29:setStart (-555, -263); break;case 30:setStart (-498, -235); break;default:break;}
}
void MainWindow::setEndStation ()
{switch (endComboBox->currentIndex ()) {case 0:setEnd(-660, -534); break;case 1:setEnd (-673, -490); break;case 2:setEnd (-682, -446); break;case 3:setEnd (-690, -400); break;case 4:setEnd (-701, -355); break;case 5:setEnd (-711, -310); break;case 6:setEnd (-457, -555); break;case 7:setEnd (-449, -485); break;case 8:setEnd (-446, -432); break;case 9:setEnd (-451, -400); break;case 10:setEnd (-347, -353); break;case 11:setEnd (-720, -247); break;case 12:setEnd (-789, -252); break;case 13:setEnd (-721, -517); break;case 14:setEnd (-271, -540); break;case 15:setEnd (-721, -439); break;case 16:setEnd (-274, -495); break;case 17:setEnd (-180, -552); break;case 18:setEnd (-178, -508); break;case 19:setEnd (-179, -456); break;case 20:setEnd (-73, -549); break;case 21:setEnd (-56, -500); break;case 22:setEnd (-59, -448); break;case 23:setEnd (-94, -381); break;case 24:setEnd (-69, -351); break;case 25:setEnd (-1070, -92); break;case 26:setEnd (-438, -125); break;case 27:setEnd (-721, -119); break;case 28:setEnd (-550, -122); break;case 29:setEnd (-555, -263); break;case 30:setEnd (-498, -235); break;default:break;}
}
void MainWindow::setNextPos (int index)
{switch (index) {case 0:setEnd(-660, -534); break;case 1:setEnd (-673, -490); break;case 2:setEnd (-682, -446); break;case 3:setEnd (-690, -400); break;case 4:setEnd (-701, -355); break;case 5:setEnd (-711, -310); break;case 6:setEnd (-457, -555); break;case 7:setEnd (-449, -485); break;case 8:setEnd (-446, -432); break;case 9:setEnd (-451, -400); break;case 10:setEnd (-347, -353); break;case 11:setEnd (-720, -247); break;case 12:setEnd (-789, -252); break;case 13:setEnd (-721, -517); break;case 14:setEnd (-271, -540); break;case 15:setEnd (-721, -439); break;case 16:setEnd (-274, -495); break;case 17:setEnd (-180, -552); break;case 18:setEnd (-178, -508); break;case 19:setEnd (-179, -456); break;case 20:setEnd (-73, -549); break;case 21:setEnd (-56, -500); break;case 22:setEnd (-59, -448); break;case 23:setEnd (-94, -381); break;case 24:setEnd (-69, -351); break;case 25:setEnd (-1070, -92); break;case 26:setEnd (-438, -125); break;case 27:setEnd (-721, -119); break;case 28:setEnd (-550, -122); break;case 29:setEnd (-555, -263); break;case 30:setEnd (-498, -235); break;default:break;}
}
void MainWindow::FindPath ()
{//Demo 在图片上绘线 在原有基础上 (+700, +440);QVector<QPoint> v;dj->dijkstra (startComboBox->currentIndex ());//设置下一处的终点nextPath = dj->get_Path (endComboBox->currentIndex ());//准备绘制Clear ();//将路线绘制下来QGraphicsPathItem *item = new QGraphicsPathItem();QPen pen;pen.setWidth (4);pen.setColor (Qt::red);item->setPen (pen);item->setFlag (QGraphicsItem::ItemIsPanel);
// qDebug() << startX << " " << startY << " " << endX << " " << endY;
// qDebug() << "Hello World !";//设置起点
// v << QPoint(startX + 700, startY + 440);for (int i = 1; i < nextPath.size (); i++) {qDebug() << nextPath[i] << " , ";}scene->addItem (item);QPainterPath pa; //path
// setNextPos (nextPath[1]);
// item->setLine (startX + 700, startY + 440, endX + 700, endY + 440);pa.moveTo (startX + 700, startY + 440);for (int i = 1; i < nextPath.size() ; i++) {setNextPos (nextPath[i]);pa.lineTo (endX + 700, endY + 440);}item->setPath (pa);
}
void MainWindow::Clear ()
{QList<QGraphicsItem*> listItem = scene->items ();while (!listItem.empty ()){scene->removeItem (listItem.at (0));listItem.removeAt (0);}QGraphicsPixmapItem *item =scene->addPixmap (QPixmap("NanTong.jpg"));
// item->setFlag (QGraphicsItem::ItemIsMovable);item->setPos (-500, -420);
}
void MainWindow::paintEvent (QPaintEvent *)
{}
下面是main主函数调用。
//Main.cpp
#include "mainwindow.h"
#include "mapwidget.h"
#include <QApplication>
#include <QFont>
#include <QDebug>int main(int argc, char *argv[])
{QApplication a(argc, argv);QFont font("ARPL KaitiM GB", 12);font.setBold (true);a.setFont (font);qDebug() << "Run............";MainWindow w;w.show ();return a.exec();
}
end