自定义标绘之七 - 数据的保存与读取

几何标绘完成之后，需要把标绘的内容保存到文件中，下次使用的时候，在加载起来就可以了。
文件保存的基类：

//几何图形的问价保存

class IGeoStorage {
public:
	IGeoStorage();
	~IGeoStorage();

	void setFile(FILE* file);

	virtual void saveTo();
	virtual void loadFrom();

protected:
	FILE* _file = nullptr;
};

IGeoStorage::IGeoStorage() {
}

IGeoStorage::~IGeoStorage() {
}

void IGeoStorage::setFile(FILE* file) {
	_file = file;
}

void IGeoStorage::saveTo() {

}

void IGeoStorage::loadFrom() {

}

文件保存管理：

#define GeoStorageMgr() (GeoStorageManager::getInstance())

class GeoStorageManager {
private:
	GeoStorageManager();
	static GeoStorageManager* _instance;
public:
	~GeoStorageManager();
	static GeoStorageManager* getInstance();

	void addGeoStorage(IGeoStorage* storage);

	void saveToFile(QString path);
	int loadFromFile(QString path);

private:
	void saveName(QString geoName);
private:
	QVector<IGeoStorage*> _storageList;

	FILE* _file = nullptr;
	ReadGeoFactory* _readFactory = nullptr;
};

#define GeoStorageMgr() (GeoStorageManager::getInstance())

class GeoStorageManager {
private:
	GeoStorageManager();
	static GeoStorageManager* _instance;
public:
	~GeoStorageManager();
	static GeoStorageManager* getInstance();

	void addGeoStorage(IGeoStorage* storage);

	void saveToFile(QString path);
	int loadFromFile(QString path);

private:
	void saveName(QString geoName);
private:
	QVector<IGeoStorage*> _storageList;

	FILE* _file = nullptr;
	ReadGeoFactory* _readFactory = nullptr;
};

点数据保存：

//具有存储功能的几何点对象

class StoragePointGeo 
	: public PointGeo
	, public IGeoStorage {
public:
	StoragePointGeo();
	~StoragePointGeo();

	virtual void saveTo()override;
	virtual void loadFrom()override;
};

StoragePointGeo::StoragePointGeo() {
}

StoragePointGeo::~StoragePointGeo() {
}

void StoragePointGeo::saveTo() {
	//1.保存经纬高
	fwrite(&_lon, sizeof(double), 1, _file);
	fwrite(&_lat, sizeof(double), 1, _file);
	fwrite(&_alt, sizeof(double), 1, _file);
	//2.保存半径
	int r = _pointProp->getRadius();
	fwrite(&r, sizeof(int), 1, _file);
	//3.外圈线粗
	int w = _pointProp->getOuterWidth();
	fwrite(&w, sizeof(int), 1, _file);
	//4.外圈颜色
	QColor oc = _pointProp->getOuterColor();
	int oc_r = oc.red();
	fwrite(&oc_r, sizeof(int), 1, _file);

	int oc_g = oc.green();
	fwrite(&oc_g, sizeof(int), 1, _file);

	int oc_b = oc.blue();
	fwrite(&oc_b, sizeof(int), 1, _file);

	//5.填充颜色
	QColor fc = _pointProp->getFillColor();
	int fc_r = fc.red();
	fwrite(&fc_r, sizeof(int), 1, _file);

	int fc_g = fc.green();
	fwrite(&fc_g, sizeof(int), 1, _file);

	int fc_b = fc.blue();
	fwrite(&fc_b, sizeof(int), 1, _file);

	//6.透明度
	int a = _pointProp->getAlpha();
	fwrite(&a, sizeof(int), 1, _file);

	//7.是否显示名称
	bool b = _pointProp->getShowName();
	fwrite(&b, sizeof(bool), 1, _file);
}

void StoragePointGeo::loadFrom() {
	//1.保存经纬高
	fread(&_lon, sizeof(double), 1, _file);
	fread(&_lat, sizeof(double), 1, _file);
	fread(&_alt, sizeof(double), 1, _file);
	//2.保存半径
	int r = 0;
	fread(&r, sizeof(int), 1, _file);
	_pointProp->setRadius(r);

	//3.外圈线粗
	int w = 0;
	fread(&w, sizeof(int), 1, _file);
	_pointProp->setOuterWidth(w);
	//4.外圈颜色
	QColor oc;
	int oc_r = 0;
	fread(&oc_r, sizeof(int), 1, _file);
	oc.setRed(oc_r);

	int oc_g = 0;
	fread(&oc_g, sizeof(int), 1, _file);
	oc.setGreen(oc_g);

	int oc_b = 0;
	fread(&oc_b, sizeof(int), 1, _file);
	oc.setBlue(oc_b);
	_pointProp->setOuterColor(oc);

	//5.填充颜色
	QColor fc;
	int fc_r = 0;
	fread(&fc_r, sizeof(int), 1, _file);
	fc.setRed(fc_r);

	int fc_g = 0;
	fread(&fc_g, sizeof(int), 1, _file);
	fc.setGreen(fc_g);

	int fc_b = 0;
	fread(&fc_b, sizeof(int), 1, _file);
	fc.setBlue(fc_b);
	_pointProp->setFillColor(fc);

	//6.透明度
	int a = 0;
	fread(&a, sizeof(int), 1, _file);
	_pointProp->setAlpha(a);

	//7.是否显示名称
	bool b = false;
	fread(&b, sizeof(bool), 1, _file);
	_pointProp->setShowName(b);
}

线数据保存：

class StorageLineGeo :
	public LineGeo 
	, public IGeoStorage {

public:
	StorageLineGeo();
	~StorageLineGeo();

	virtual void saveTo()override;
	virtual void loadFrom()override;
}; 

StorageLineGeo::StorageLineGeo() {
}

StorageLineGeo::~StorageLineGeo() {
}

void StorageLineGeo::saveTo() {
	QVector<UserGeoPoint>&points = getPoints();
	int size = points.size();
	//保存点数量;
	fwrite(&size, sizeof(int), 1, _file);
	for (size_t i = 0; i < points.size(); ++i) {
		//1.保存经纬高;
		fwrite(&points[i].lon, sizeof(double), 1, _file);
		fwrite(&points[i].lat, sizeof(double), 1, _file);
		fwrite(&points[i].alt, sizeof(double), 1, _file);
	}

	GeoLineProp* lineProp = getLineProp();
	if (lineProp) {
		int lineWidth = lineProp->getLineWidth();
		fwrite(&lineWidth, sizeof(int), 1, _file);
		
		int lineType = lineProp->getLineType();
		fwrite(&lineType, sizeof(int), 1, _file);

		QColor lineColor = lineProp->getLineColor();
		int oc_r = lineColor.red();
		fwrite(&oc_r, sizeof(int), 1, _file);
		int oc_g = lineColor.green();
		fwrite(&oc_g, sizeof(int), 1, _file);
		int oc_b = lineColor.blue();
		fwrite(&oc_b, sizeof(int), 1, _file);

		int lineAlpha = lineProp->getLineAlpha();
		fwrite(&lineAlpha, sizeof(int), 1, _file);

		bool b = lineProp->getShowName();
		fwrite(&b, sizeof(bool), 1, _file);
	}
}

void StorageLineGeo::loadFrom() {
	int size = 0;
	getPoints().clear();
	fread(&size, sizeof(int), 1, _file);
	for (int i = 0; i < size; ++i) {
		UserGeoPoint geoPoint;
		double lon = 0.0, lat = 0.0, alt = 0.0;
		fread(&lon, sizeof(double), 1, _file);
		fread(&lat, sizeof(double), 1, _file);
		fread(&alt, sizeof(double), 1, _file);
		geoPoint.lon = lon;
		geoPoint.lat = lat;
		geoPoint.alt = alt;
		addLinePoint(geoPoint);
	}
	GeoLineProp* lineProp = getLineProp();
	if (lineProp) {
		int lineWidth = 0;
		fread(&lineWidth, sizeof(int), 1, _file);
		lineProp->setLineWidth(lineWidth);

		int lineType = 0;
		fread(&lineType, sizeof(int), 1, _file);
		lineProp->setLineType(lineType);
	
		QColor lineColor;
		int oc_r = 0;
		fread(&oc_r, sizeof(int), 1, _file);
		lineColor.setRed(oc_r);

		int oc_g = 0;
		fread(&oc_g, sizeof(int), 1, _file);
		lineColor.setGreen(oc_g);

		int oc_b = 0;
		fread(&oc_b, sizeof(int), 1, _file);
		lineColor.setBlue(oc_b);
		lineProp->setLineColor(lineColor);

		int lineAlpha = 0;
		fread(&lineAlpha, sizeof(int), 1, _file);
		lineProp->setLineAlpha(lineAlpha);

		bool b = false;
		fread(&b, sizeof(bool), 1, _file);
		lineProp->setShowName(b);
	}
}

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