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mapscene.cpp
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mapscene.cpp
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#include "mapscene.h"
MapScene::MapScene(QObject *parent)
: QGraphicsScene{parent}
{
}
MapScene::MapScene(QRectF rect, QObject *parent):QGraphicsScene(rect,parent)
{
}
MapScene::~MapScene()
{
qDebug()<<"MapScene release";
delete m_curCS;
}
void MapScene::setCurCS(const GDALDatasetUniquePtr& ptr)
{
//获取图层
OGRLayer* poLayer = ptr->GetLayer(0);
if (poLayer == nullptr) {
qDebug() << "Layer not found";
return;
}
m_curCS = poLayer->GetSpatialRef();
if(m_curCS!=nullptr){
qDebug() << "坐标设置成功";
}
else {
qDebug() << "未知坐标";
}
}
void MapScene::setEnvelope(const OGREnvelope* const envelope)
{
if(envelope!=nullptr){
m_envelope = *envelope;
qDebug() << "Set Extent: \nMinX=" << m_envelope.MinX << ", MinY=" << m_envelope.MinY;
qDebug() << ", MaxX=" << m_envelope.MaxX << ", MaxY=" << m_envelope.MaxY;
}
else{
qDebug() << "未知范围";
}
//保持横纵缩放一致
auto rect = this->sceneRect();
float x_scale = (m_envelope.MaxX-m_envelope.MinX)/(rect.right()-rect.left());
float y_scale = (m_envelope.MaxY-m_envelope.MinY)/(rect.bottom()-rect.top());
if(x_scale>y_scale){
m_envelope.MinY = (m_envelope.MaxY + m_envelope.MinY)/2 - (m_envelope.MaxY - m_envelope.MinY)/2 * x_scale/y_scale;
m_envelope.MaxY = (m_envelope.MaxY + m_envelope.MinY)/2 + (m_envelope.MaxY - m_envelope.MinY)/2 * x_scale/y_scale;
m_scale = x_scale;
}
else{
m_envelope.MinX = (m_envelope.MaxX + m_envelope.MinX)/2 - (m_envelope.MaxX - m_envelope.MinX)/2 * y_scale/x_scale;
m_envelope.MaxX = (m_envelope.MaxX + m_envelope.MinX)/2 + (m_envelope.MaxX - m_envelope.MinX)/2 * y_scale/x_scale;
m_scale = y_scale;
}
}
QPointF MapScene::ScenePoint2CSPoint(const QPointF &scenePoint)
{
auto scene_rect = this->sceneRect();
float X = (scenePoint.x()-scene_rect.left())/scene_rect.width()*(m_envelope.MaxX-m_envelope.MinX)+m_envelope.MinX;
float Y = (scene_rect.bottom()-scenePoint.y())/scene_rect.height()*(m_envelope.MaxY-m_envelope.MinY)+m_envelope.MinY;
return QPointF(X,Y);
}
QPointF MapScene::CSPoint2ScenePoint(const QPointF &cSPoint)
{
auto scene_rect = this->sceneRect();
float X = (cSPoint.x()-m_envelope.MinX)/(m_envelope.MaxX-m_envelope.MinX)*scene_rect.width()+scene_rect.left();
float Y = scene_rect.bottom()-(cSPoint.y()-m_envelope.MinY)/(m_envelope.MaxY-m_envelope.MinY)*scene_rect.height();
return QPointF(X,Y);
}
QString MapScene::getCSName()
{
if(m_curCS != nullptr){
char* pszSRS_WKT = nullptr;
m_curCS->exportToWkt(&pszSRS_WKT);
auto coordSystem = QString(pszSRS_WKT);
// 找到 "GEOGCS[" 的起始位置
int geogcsIndex = coordSystem.indexOf("GEOGCS[");
if (geogcsIndex == -1) {
return QString(); // 如果找不到,返回空字符串
}
// 找到第一个双引号的位置
int firstQuoteIndex = coordSystem.indexOf('"', geogcsIndex);
if (firstQuoteIndex == -1) {
return QString(); // 如果找不到,返回空字符串
}
// 找到第二个双引号的位置
int secondQuoteIndex = coordSystem.indexOf('"', firstQuoteIndex + 1);
if (secondQuoteIndex == -1) {
return QString(); // 如果找不到,返回空字符串
}
// 提取双引号之间的内容
QString coordName = coordSystem.mid(firstQuoteIndex + 1, secondQuoteIndex - firstQuoteIndex - 1);
return coordName;
}
else{
qDebug() << "未知坐标系";
return nullptr;
}
}
void MapScene::drawShp(GeoData *geodata)
{
OGRLayer* poLayer = geodata->getDataUniquePtr()->GetLayer(0);
if (poLayer == nullptr) {
qDebug() << "无效图层";
return;
}
for(auto& poFeature:poLayer){
auto poGeometry = poFeature->GetGeometryRef();
if(poGeometry == nullptr)
return;
if(wkbFlatten(poGeometry->getGeometryType()) == wkbPolygon)
addPolygontoScene(poGeometry);
if(wkbFlatten(poGeometry->getGeometryType()) == wkbLineString)
addLineStringtoScene(poGeometry);
}
}
void MapScene::addPolygontoScene(OGRGeometry* poGeometry)
{
QPolygonF polygon;
// 输出多边形的顶点
OGRPolygon* poPolygon = static_cast<OGRPolygon*>(poGeometry);
OGRLinearRing* poExteriorRing = poPolygon->getExteriorRing();
if (poExteriorRing != nullptr) {
int nVertices = poExteriorRing->getNumPoints();
for (int i = 0; i < nVertices; i++) {
polygon<<CSPoint2ScenePoint({poExteriorRing->getX(i),poExteriorRing->getY(i)});
}
}
QGraphicsPolygonItem* polygonItem = new QGraphicsPolygonItem(polygon);
this->addItem(polygonItem);
}
void MapScene::addLineStringtoScene(OGRGeometry *poGeometry)
{
OGRLineString* poLineString = static_cast<OGRLineString*>(poGeometry);
if (poLineString != nullptr) {
// 创建一个路径
QPainterPath path;
// 输出折线顶点
path.moveTo(CSPoint2ScenePoint({poLineString->getX(0),poLineString->getY(0)}));
int numPoints = poLineString->getNumPoints(); // 获取顶点数
for (int i = 1; i < numPoints; i++) {
path.lineTo(CSPoint2ScenePoint({poLineString->getX(i),poLineString->getY(i)}));
}
QGraphicsPathItem *pathItem = new QGraphicsPathItem(path);
this->addItem(pathItem);
}
}
void MapScene::moveExtent(QPoint movePoint)
{
m_envelope.MaxX -= movePoint.x()*m_scale;
m_envelope.MaxY += movePoint.y()*m_scale;
m_envelope.MinX -= movePoint.x()*m_scale;
m_envelope.MinY += movePoint.y()*m_scale;
}
void MapScene::changeScale(float ratio)
{
m_scale = m_scale*(ratio);
m_envelope.MinY = (m_envelope.MaxY + m_envelope.MinY)/2 - (m_envelope.MaxY - m_envelope.MinY)/2 * (ratio);
m_envelope.MaxY = (m_envelope.MaxY + m_envelope.MinY)/2 + (m_envelope.MaxY - m_envelope.MinY)/2 * (ratio);
m_envelope.MinX = (m_envelope.MaxX + m_envelope.MinX)/2 - (m_envelope.MaxX - m_envelope.MinX)/2 * (ratio);
m_envelope.MaxX = (m_envelope.MaxX + m_envelope.MinX)/2 + (m_envelope.MaxX - m_envelope.MinX)/2 * (ratio);
}
float MapScene::scale() const
{
return m_scale;
}
void MapScene::setScale(float newScale)
{
m_scale = newScale;
}
OGRSpatialReference *MapScene::curCS() const
{
return m_curCS;
}
const OGREnvelope& MapScene::envelope()
{
return m_envelope;
}