地图，坐标读取不进程序么？

wy1026

#include "mapwidget.h"#include <QSlider>#include <QGridLayout>#include <QFile>#include <QTextStream>#include <QGraphicsScene>#include <math.h>MapWidget::MapWidget(){    readMap();                                        //读取地图信息    zoom=50;    int width = map.width();    int height = map.height();    QGraphicsScene *scene = new QGraphicsScene(this);    scene->setSceneRect(-width/2,-height/2,width,height);    setScene(scene);    setCacheMode(CacheBackground);    //用于地图缩放的滑动条    QSlider *slider = new QSlider;    slider->setOrientation(Qt::Vertical);    slider->setRange(1,100);    slider->setTickInterval(10);    slider->setValue(50);    connect(slider,SIGNAL(valueChanged(int)),this,SLOT(slotZoom(int)));    QLabel *zoominLabel = new QLabel;    zoominLabel->setScaledContents(true);    zoominLabel->setPixmap(QPixmap("zoomin.png"));    QLabel *zoomoutLabel = new QLabel;    zoomoutLabel->setScaledContents(true);    zoomoutLabel->setPixmap(QPixmap("zoomout.png"));    //坐标值显示区    QLabel *label1 = new QLabel(tr("GraphicsView:"));    viewCoord = new QLabel;    QLabel *label2 = new QLabel(tr("GraphicsScene:"));    sceneCoord = new QLabel;    QLabel *label3 = new QLabel(tr("map:"));    mapCoord = new QLabel;    //坐标显示区布局    QGridLayout *gridLayout = new QGridLayout;    gridLayout->addWidget(label1,0,0);    gridLayout->addWidget(viewCoord,0,1);    gridLayout->addWidget(label2,1,0);    gridLayout->addWidget(sceneCoord,1,1);    gridLayout->addWidget(label3,2,0);    gridLayout->addWidget(mapCoord,2,1);    gridLayout->setSizeConstraint(QLayout::SetFixedSize);    QFrame *coordFrame = new QFrame;    coordFrame->setLayout(gridLayout);    //缩放控制子布局    QVBoxLayout *zoomLayout = new QVBoxLayout;    zoomLayout->addWidget(zoominLabel);    zoomLayout->addWidget(slider);    zoomLayout->addWidget(zoomoutLabel);    //坐标显示区域布局    QVBoxLayout *coordLayout = new QVBoxLayout;    coordLayout->addWidget(coordFrame);    coordLayout->addStretch();    //主布局    QHBoxLayout *mainLayout = new QHBoxLayout;    mainLayout->addLayout(zoomLayout);    mainLayout->addLayout(coordLayout);    mainLayout->addStretch();    mainLayout->setMargin(30);    mainLayout->setSpacing(10);    setLayout(mainLayout);    setWindowTitle("Map Widget");    setMinimumSize(600,400);}void MapWidget::readMap()            //读取地图信息{    QString mapName;    QFile mapFile("maps.txt");    int ok = mapFile.open(QIODevice::ReadOnly);    if(ok)    {        QTextStream ts(&mapFile);        if(!ts.atEnd())        {            ts>>mapName;            ts>>x1>>y1>>x2>>y2;        }    }    map.load(mapName);}void MapWidget::slotZoom(int value)           //地图缩放{    qreal s;    if(value>zoom)                                 //放大    {        s=pow(1.01,(value-zoom));    }    else                                     //缩小    {        s=pow(1/1.01,(zoom-value));    }    scale(s,s);    zoom = value;}void MapWidget::drawBackground(QPainter *painter, const QRectF &rect){    painter->drawPixmap(int(sceneRect().left()),int(sceneRect().top()), map);}void MapWidget::mouseMoveEvent(QMouseEvent *event){    //QGraphicsView 坐标    QPoint viewPoint = event->pos();    viewCoord->setText(QString::number(viewPoint.x())+","+QString::number(viewPoint.y()));    //QGraphicsScene 坐标    QPointF scenePoint = mapToScene(viewPoint);    sceneCoord->setText(QString::number(scenePoint.x())+","+QString::number(scenePoint.y()));    //地图坐标(经、纬度值)    QPointF latLon = mapToMap(scenePoint);    mapCoord->setText(QString::number(latLon.x())+","+QString::number(latLon.y()));}QPointF MapWidget::mapToMap(QPointF p){    QPointF latLon;    qreal w =sceneRect().width();    qreal h =sceneRect().height();    qreal lon = y1-((h/2+p.y())*abs(y1-y2)/h);    qreal lat = x1+((w/2+p.x())*abs(x1-x2)/w);    latLon.setX(lat);    latLon.setY(lon);    return latLon;}地图文件显示不了，maps.txt好像也读不进来。。怎麼回事呢？

jsjshhd

码真特么乱

wy1026

1. #include "mapwidget.h"
   
2. #include <QSlider>
   
3. #include <QGridLayout>
   
4. #include <QFile>
   
5. #include <QTextStream>
   
6. #include <QGraphicsScene>
   
7. #include <math.h>
   
8. MapWidget::MapWidget()
   
9. {
   
10.     readMap();                                        //读取地图信息
    
11.     zoom=50;
    
12.     int width = map.width();
    
13.     int height = map.height();
    
14.     QGraphicsScene *scene = new QGraphicsScene(this);
    
15.     scene->setSceneRect(-width/2,-height/2,width,height);
    
16.     setScene(scene);
    
17.     setCacheMode(CacheBackground);
    
18.     //用于地图缩放的滑动条
    
19.     QSlider *slider = new QSlider;
    
20.     slider->setOrientation(Qt::Vertical);
    
21.     slider->setRange(1,100);
    
22.     slider->setTickInterval(10);
    
23.     slider->setValue(50);
    
24.     connect(slider,SIGNAL(valueChanged(int)),this,SLOT(slotZoom(int)));
    
25.     QLabel *zoominLabel = new QLabel;
    
26.     zoominLabel->setScaledContents(true);
    
27.     zoominLabel->setPixmap(QPixmap("zoomin.png"));
    
28.     QLabel *zoomoutLabel = new QLabel;
    
29.     zoomoutLabel->setScaledContents(true);
    
30.     zoomoutLabel->setPixmap(QPixmap("zoomout.png"));
    
31.     //坐标值显示区
    
32.     QLabel *label1 = new QLabel(tr("GraphicsView:"));
    
33.     viewCoord = new QLabel;
    
34.     QLabel *label2 = new QLabel(tr("GraphicsScene:"));
    
35.     sceneCoord = new QLabel;
    
36.     QLabel *label3 = new QLabel(tr("map:"));
    
37.     mapCoord = new QLabel;
    
38.     //坐标显示区布局
    
39.     QGridLayout *gridLayout = new QGridLayout;
    
40.     gridLayout->addWidget(label1,0,0);
    
41.     gridLayout->addWidget(viewCoord,0,1);
    
42.     gridLayout->addWidget(label2,1,0);
    
43.     gridLayout->addWidget(sceneCoord,1,1);
    
44.     gridLayout->addWidget(label3,2,0);
    
45.     gridLayout->addWidget(mapCoord,2,1);
    
46.     gridLayout->setSizeConstraint(QLayout::SetFixedSize);
    
47.     QFrame *coordFrame = new QFrame;
    
48.     coordFrame->setLayout(gridLayout);
    
49.     //缩放控制子布局
    
50.     QVBoxLayout *zoomLayout = new QVBoxLayout;
    
51.     zoomLayout->addWidget(zoominLabel);
    
52.     zoomLayout->addWidget(slider);
    
53.     zoomLayout->addWidget(zoomoutLabel);
    
54.     //坐标显示区域布局
    
55.     QVBoxLayout *coordLayout = new QVBoxLayout;
    
56.     coordLayout->addWidget(coordFrame);
    
57.     coordLayout->addStretch();
    
58.     //主布局
    
59.     QHBoxLayout *mainLayout = new QHBoxLayout;
    
60.     mainLayout->addLayout(zoomLayout);
    
61.     mainLayout->addLayout(coordLayout);
    
62.     mainLayout->addStretch();
    
63.     mainLayout->setMargin(30);
    
64.     mainLayout->setSpacing(10);
    
65.     setLayout(mainLayout);
    
66.     setWindowTitle("Map Widget");
    
67.     setMinimumSize(600,400);
    
68. }
    
69. void MapWidget::readMap()            //读取地图信息
    
70. {
    
71.     QString mapName;
    
72.     QFile mapFile("maps.txt");
    
73.     int ok = mapFile.open(QIODevice::ReadOnly);
    
74.     if(ok)
    
75.     {
    
76.         QTextStream ts(&mapFile);
    
77.         if(!ts.atEnd())
    
78.         {
    
79.             ts>>mapName;
    
80.             ts>>x1>>y1>>x2>>y2;
    
81.         }
    
82.     }
    
83.     map.load(mapName);
    
84. }
    
85. void MapWidget::slotZoom(int value)           //地图缩放
    
86. {
    
87.     qreal s;
    
88.     if(value>zoom)                                 //放大
    
89.     {
    
90.         s=pow(1.01,(value-zoom));
    
91.     }
    
92.     else                                     //缩小
    
93.     {
    
94.         s=pow(1/1.01,(zoom-value));
    
95.     }
    
96.     scale(s,s);
    
97.     zoom = value;
    
98. }
    
99. void MapWidget::drawBackground(QPainter *painter, const QRectF &rect)
    
100. {
     
101.     painter->drawPixmap(int(sceneRect().left()),int(sceneRect().top()), map);
     
102. }
     
103. void MapWidget::mouseMoveEvent(QMouseEvent *event)
     
104. {
     
105.     //QGraphicsView 坐标
     
106.     QPoint viewPoint = event->pos();
     
107.     viewCoord->setText(QString::number(viewPoint.x())+","+QString::number(viewPoint.y()));
     
108.     //QGraphicsScene 坐标
     
109.     QPointF scenePoint = mapToScene(viewPoint);
     
110.     sceneCoord->setText(QString::number(scenePoint.x())+","+QString::number(scenePoint.y()));
     
111.     //地图坐标(经、纬度值)
     
112.     QPointF latLon = mapToMap(scenePoint);
     
113.     mapCoord->setText(QString::number(latLon.x())+","+QString::number(latLon.y()));
     
114. }
     
115. QPointF MapWidget::mapToMap(QPointF p)
     
116. {
     
117.     QPointF latLon;
     
118.     qreal w =sceneRect().width();
     
119.     qreal h =sceneRect().height();
     
120.     qreal lon = y1-((h/2+p.y())*abs(y1-y2)/h);
     
121.     qreal lat = x1+((w/2+p.x())*abs(x1-x2)/w);
     
122.     latLon.setX(lat);
     
123.     latLon.setY(lon);
     
124.     return latLon;
     
125. }
     

复制代码

wy1026

jsjshhd 发表于 2017-3-30 17:31
码真特么乱

哈哈  不好意思。我也没想到复制粘贴上来就成这样了。下面那个正常点。。。麻烦指教一下

wy1026

1. <pre><div class="blockcode"><blockquote>#include "mainwindow.h"
   
2. #include "mapwidget.h"
   
3. #include <QApplication>
   
4. #include <QFont>
   
5. 
   
6. int main(int argc, char *argv[])
   
7. {
   
8.     QApplication a(argc, argv);
   
9.     QApplication::addLibraryPath("./plugins");
   
10.     QFont font("ARPL KaitiM GB",12);
    
11.     font.setBold(true);
    
12.     a.setFont(font);
    
13.     MapWidget mapWidget;
    
14.     mapWidget.show();
    
15. 
    
16.     return a.exec();
    
17. }

复制代码

主函数

wy1026

头文件

1. #ifndef MAPWIDGET_H
   
2. #define MAPWIDGET_H
   
3. #include <QGraphicsView>
   
4. #include <QLabel>
   
5. #include <QMouseEvent>
   
6. 
   
7. class MapWidget : public QGraphicsView
   
8. {
   
9.     Q_OBJECT
   
10. public:MapWidget();
    
11. 
    
12.     void readMap();                         //读取地图信息
    
13.     QPointF mapToMap(QPointF);                          //用于实现场景坐标系与地图坐标之间的映射，以获得某点的经纬度值
    
14. 
    
15. public slots:
    
16.     void slotZoom(int);
    
17. protected:
    
18.     void drawBackground(QPainter *painter, const QRectF &rect);                 //完成地图显示的功能
    
19.     void mouseMoveEvent(QMouseEvent *event);
    
20. 
    
21. private:
    
22.     QPixmap map;
    
23.     qreal zoom;
    
24.     QLabel *viewCoord;
    
25.     QLabel *sceneCoord;
    
26.     QLabel *mapCoord;
    
27.     double x1,y1;
    
28.     double x2,y2;
    
29. };
    
30. 
    
31. #endif // MAPWIDGET_H
    

复制代码