QGIS编译好的工程文件，包含基本的QGIS功能模块

#pragma execution_character_set("utf-8") #include "QMFA.h" #include <qmenubar.h> #include <qfiledialog.h> #include <qmessagebox.h> #include "qgslayertreemodel.h"//使用给定层树构建新的树模型,一般与QgsLayerTreeView 一起使用 #include "qgridlayout.h" #include "qtoolbutton.h" #include "qdockwidget.h" #include "DBCLayertreeviewmenuprovider.h" //图层管理器右键菜单类 #include "qgslayertreeregistrybridge.h"//创建与层树根同步给定项目的实例,收听地图层注册表中的更新，并在层树中进行更改 QMFA* QMFA::sm_instance = 0; QMFA::QMFA(QWidget *parent) : QMainWindow(parent) { ui.setupUi(this); //设置主窗口参数 this->resize(1200, 800); this->setWindowTitle("MyGIS"); this->setWindowIcon(QIcon("1.ico")); this->MenuClicks(); //初始化地图画布 mapCanvas = new QgsMapCanvas(); this->setCentralWidget(mapCanvas); //将地图画布放置我们创建的主窗口中心 mapCanvas->setCanvasColor(QColor(255, 255, 255)); //设置地图画布为白色 mapCanvas->setVisible(true); mapCanvas->enableAntiAliasing(true); //初始化图层管理器 layerTreeView = new QgsLayerTreeView(this); initLayerTreeView(); //栅格布局 QWidget* centralWidget = this->centralWidget(); QGridLayout* centralLayout = new QGridLayout(centralWidget); //centralLayout->addWidget(layerTreeView, 0, 0, 2, 1); //图层管理器位置 centralLayout->addWidget(mapCanvas, 0, 1, 2, 1); //画布位置 后面四个参数：初始行列 占位行类 QStatusBar* pStatusBar = new QStatusBar(); setStatusBar(pStatusBar); createStatusBar(); //鼠标移动图层 QgsMapToolPan* tool = new QgsMapToolPan(mapCanvas); mapCanvas->setMapTool(tool); //中国shp文件-地理坐标系-utf-8 QString filename1 = "../QMFA/QGIS_shp/china.shp"; QString filename2 = "../QMFA/QGIS_shp/china_nine_dotted_line.shp"; QStringList temp1 = filename1.split('/'); QStringList temp2 = filename2.split('/'); QString basename1 = temp1.at(temp1.size() - 1); QString basename2 = temp2.at(temp2.size() - 1); QgsVectorLayer* vecLayer1 = new QgsVectorLayer(filename1, basename1, "ogr"); QgsVectorLayer* veclayer2 = new QgsVectorLayer(filename2, basename2, "ogr"); QgsProject::instance()->addMapLayer(vecLayer1); QgsProject::instance()->addMapLayer(veclayer2); mapCanvas->setExtent(vecLayer1->extent()); mapCanvas->setExtent(veclayer2->extent()); layers.append(vecLayer1); layers.append(veclayer2); mapCanvas->setLayers(layers); mapCanvas->setVisible(true); mapCanvas->freeze(false); mapCanvas->refresh(); //设置标签样式 //首先是定义一个 QgsPalLayerSettings 变量，并启用他的属性设置 QgsPalLayerSettings layerSettings; layerSettings.drawLabels = true; //根据API文档中的属性，进行自定义配置 layerSettings.fieldName = vecLayer1->fields()[3].name(); // 设置Label图层 layerSettings.centroidWhole = true; //设置位置参考的中心点 layerSettings.isExpression = true; layerSettings.placement = QgsPalLayerSettings::OverPoint; layerSettings.yOffset = 2.5; //// Label 字体设置:轮廓buffer设置 //QgsTextBufferSettings buffersettings; //buffersettings.setEnabled(true); //buffersettings.setSize(1); //buffersettings.setColor(QColor(255, 0, 0)); ////字体阴影 //QgsTextShadowSettings shadowsetings; //shadowsetings.setEnabled(true); //shadowsetings.setOffsetAngle(135); //shadowsetings.setOffsetDistance(1); //字体格式 QgsTextFormat textformat; QFont font("Times", 5, 5, false); font.setUnderline(false); textformat.setFont(font); //textformat.setBuffer(buffersettings); //textformat.setShadow(shadowsetings); layerSettings.setFormat(textformat); QgsVectorLayerSimpleLabeling* labeling = new QgsVectorLayerSimpleLabeling(layerSettings); vecLayer1->setLabeling(labeling); vecLayer1->setLabelsEnabled(true); /*LayerLableSet(vecLayer1);*/ /**/ //OSM在线地图-投影坐标系 //addOpenSourceRasterLayer("type=xyz&url=http://c.tile.openstreetmap.org/{z}/{x}/{y}.png", "OSM", "wms"); //addOpenSourceRasterLayer( "type=crs=EPSG:4326&xyz&url=https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}", "ESRI", "wms"); connect(mapCanvas, SIGNAL(xyCoordinates(QgsPointXY)), this, SLOT(slot_showPosition(QgsPointXY))); } QMFA::~QMFA() { } //菜单栏按钮 void QMFA::MenuClicks() { //菜单栏与对应的槽函数连接 connect(ui.action, SIGNAL(triggered(bool)), this, SLOT(on_openRasterFileAction_triggered())); connect(ui.action_3, SIGNAL(triggered(bool)), this, SLOT(on_openVectorFileAction_triggered())); connect(ui.action_5, SIGNAL(triggered(bool)), this, SLOT(on_removeFileAction_triggered())); connect(ui.action_6, SIGNAL(triggered(bool)), this, SLOT(slot_onlinemap())); } //加载在线地图 void QMFA::addOpenSourceRasterLayer(const QString& url, const QString& basename, const QString& providerKey) { QgsRasterLayer* rasterLayer = 0; if (providerKey.isEmpty()) { rasterLayer = new QgsRasterLayer(url, basename); } else { rasterLayer = new QgsRasterLayer(url, basename, providerKey); } if (!rasterLayer->isValid()) { QMessageBox::critical(this, "error", "layer is invalid!"); return; } QgsProject::instance()->addMapLayer(rasterLayer); mapCanvas->setExtent(rasterLayer->extent()); //layers.append(rasterLayer); mapCanvas->setLayers(layers); mapCanvas->setVisible(true); mapCanvas->freeze(false); mapCanvas->refresh(); } //槽函数：打开并显示栅格数据 void QMFA::on_openRasterFileAction_triggered() { //步骤1：打开文件选择对话框 QString fileName = QFileDialog::getOpenFileName(this, tr("Open raster file"), "", "TIFF(*.tif *.tiff);;Image(*.jpg *.jpeg *.png *.bmp)"); if (fileName.isNull()) //如果文件未选择则返回 { return; } QStringList temp = fileName.split('/'); QString basename = temp.at(temp.size() - 1);//获取栅格数据名称 //步骤2：创建QgsRasterLayer类 QgsRasterLayer* rasterLayer = new QgsRasterLayer(fileName, basename, "gdal"); //如果不是geotiff文件，则提示错误 if (!rasterLayer->isValid()) { QMessageBox::critical(this, "error", QString("layer is invalid: \n") + fileName); return; } //步骤3：添加栅格数据 QgsProject::instance()->addMapLayer(rasterLayer); //注册 mapCanvas->setExtent(rasterLayer->extent()); //将画布范围设置为栅格图层范围 layers.append(rasterLayer); //将栅格图层追加到链表中 mapCanvas->setLayers(layers); //将图层画到画布上 mapCanvas->setVisible(true); mapCanvas->freeze(false); mapCanvas->refresh(); //更新画布 } //槽函数：打开并显示矢量数据 void QMFA::on_openVectorFileAction_triggered() { QString fileName = QFileDialog::getOpenFileName(this, tr("Open shape file"), "", "*.shp"); if (fileName.isNull()) //如果文件未选择则返回 { return; } QStringList temp = fileName.split('/'); QString basename = temp.at(temp.size() - 1); QgsVectorLayer* vecLayer = new QgsVectorLayer(fileName, basename, "ogr"); if (!vecLayer->isValid()) { QMessageBox::critical(this, "error", QString("layer is invalid: \n") + fileName); return; } //QGIS 3注册方式 QgsProject::instance()->addMapLayer(vecLayer); mapCanvas->setExtent(vecLayer->extent()); layers.append(vecLayer); mapCanvas->setLayers(layers); mapCanvas->setVisible(true); mapCanvas->freeze(false); mapCanvas->refresh(); } //槽函数：移除图层 void QMFA::on_removeFileAction_triggered() { layers.clear(); //从链表中清除所有图层 mapCanvas->setLayers(layers);