enable multi-tiles layer support .

------------------------------------
1.declare multi tile layers in ini file:
[tiles]
name0=OSM
name1=google
name2=bing

2.set tile server addresses, Image Alpha Channel in UI

qtviewer_planetosm/osm_frame_widget.cpp

@@ -9,6 +9,8 @@
 #include <QPluginLoader>
 #include <QFileDialog>
 #include <QSettings>
+#include <QSet>
+#include <QList>
 #include <QMessageBox>
 #include "osmtiles/viewer_interface.h"
 #include "interface_utils.h"
@@ -38,27 +40,46 @@ osm_frame_widget::osm_frame_widget(QWidget *parent) :
 	connect(ui->dial_QTV_zoom,&QDial::valueChanged,ui->widget_QTV_mainMap,&tilesviewer::setLevel);
 
 
-	//add an osm layer
-	layer_tiles * pOSMTile =  new layer_tiles(ui->widget_QTV_mainMap);
-	pOSMTile->set_name("OSM");
-	pOSMTile->set_active(true);
-	pOSMTile->set_visible(true);
-	//pOSMTile->connectToTilesServer(true);
-	AppendLayer(QCoreApplication::applicationFilePath(),pOSMTile);
-
-/*
-	//add an sat layer
-	layer_tiles * pSatTile = new layer_tiles(ui->widget_QTV_mainMap);
-	pSatTile->set_name("SAT");
-	//pSatTile->connectToTilesServer(true);
-	AppendLayer(QCoreApplication::applicationFilePath(),pSatTile);
-*/
+	QSettings settings(QCoreApplication::applicationFilePath()+".ini",QSettings::IniFormat);
+	QSet<QString> set_tilesNames;
+	QList<QString> list_tilesNames;
+	for (int i=0;i<8;++i)
+	{
+		QString lk = QString("tiles/name%1").arg(i);
+		QString nk = settings.value(lk).toString().trimmed();
+		if (nk.size() && set_tilesNames.contains(nk)==false)
+		{
+			set_tilesNames.insert(nk);
+			list_tilesNames.push_back(nk);
+		}
+	}
+	if (set_tilesNames.empty())
+	{
+		set_tilesNames.insert("OSM");
+		list_tilesNames.push_back("OSM");
+	}
+	layer_tiles * pLastTileLayer = nullptr;
+	int tc = 0;
+	foreach(QString layerNameT, list_tilesNames)
+	{
+		//add tile layers
+		layer_tiles * pTile =  new layer_tiles(ui->widget_QTV_mainMap);
+		pTile->set_name(layerNameT);
+		pTile->set_active(true);
+		pTile->set_visible(true);
+		AppendLayer(QCoreApplication::applicationFilePath(),pTile);
+		pLastTileLayer = pTile;
+		QString lk = QString("tiles/name%1").arg(tc++);
+		settings.setValue(lk,layerNameT);
+	}
+
 	//add single layer to browser
 	layer_browser * pOSMTileBr = new layer_browser(ui->browserView);
-	pOSMTileBr->set_name("OSM");
+	pOSMTileBr->set_name(pLastTileLayer->get_name());
 	pOSMTileBr->load_initial_plugin(QCoreApplication::applicationFilePath(),ui->browserView);
 	ui->browserView->addLayer(pOSMTileBr);
 
+
 	//connect center change event
 	connect (ui->widget_QTV_mainMap,&tilesviewer::evt_center_changed,ui->browserView,&tilesviewer::setBrCenterLLA);
 	connect (ui->browserView,&tilesviewer::evt_center_changed,ui->widget_QTV_mainMap,&tilesviewer::setCenterLLA);
@@ -77,7 +98,7 @@ osm_frame_widget::osm_frame_widget(QWidget *parent) :
 
 	ui->tab_map->installEventFilter(this);
 	//adjust layers, make exclusive layrs being de-activated.
-	ui->widget_QTV_mainMap->adjust_layers(pOSMTile);
+	ui->widget_QTV_mainMap->adjust_layers(pLastTileLayer);
 	EnumPlugins();
 	UpdateLayerTable();
 	//Dock is closable

qtviewer_planetosm/osmtiles/layer_tiles.cpp

@@ -84,6 +84,11 @@ namespace QTVOSM{
 			int nCurrRightX = ceil((nCenter_X+m_pViewer->windowWidth()/2)/256.0);
 			int nCurrBottomY = ceil((nCenter_Y+m_pViewer->windowHeight()/2)/256.0);
 
+			//Get Aplha paraments
+			const quint8 alphav = m_propPage->alphaValue();
+			QImage alphaMask(256,256,QImage::Format_Grayscale8);
+			if (alphav!=255)
+				alphaMask.fill(alphav);
 			//!2.4 a repeat from tileindx left to right.
 			for (int col = nCurrLeftX;col<=nCurrRightX;col++)
 			{
@@ -111,6 +116,8 @@ namespace QTVOSM{
 						int tar_x = m_pViewer->windowWidth()/2-zero_offX+nTileOffX;
 						int tar_y = m_pViewer->windowHeight()/2-zero_offY+nTileOffY;
 						//bitblt
+						if (alphav!=255)
+							image_source.setAlphaChannel(alphaMask);
 						pPainter->drawImage(tar_x,tar_y,image_source);
 					}
 				}

qtviewer_planetosm/osmtiles/layer_tiles_page.cpp

@@ -19,10 +19,12 @@ namespace QTVOSM{
 		QString strLocalCache = settings.value(QString("settings/LocalCache_%1").arg(layer->get_name()), QCoreApplication::applicationDirPath() +"/OSMCache").toString();
 		int nCacheExpireDays = settings.value(QString("settings/CacheExpireDays_%1").arg(layer->get_name()), 30).toInt();
 		int nAutoDownload = settings.value(QString("settings/nAutoDownload_%1").arg(layer->get_name()), 0).toInt();
+		int nAlpha = settings.value(QString("settings/nAlpha_%1").arg(layer->get_name()), 255).toInt();
 
 		ui->lineEdit_QTV_cacheFolder->setText(strLocalCache);
 		ui->lineEdit_QTV_addressUrl->setText(strServerURL);
 		ui->spinBox_QTV_cacheExpireDays->setValue(nCacheExpireDays);
+		ui->spinBox_QTV_Alpha->setValue(nAlpha);
 		this->setWindowTitle(layer->get_name());
 		//the pending tasks model
 		m_pPendingTasksModel = new QStandardItemModel(this);
@@ -61,6 +63,10 @@ namespace QTVOSM{
 		m_pLayer->setServerUrl(ui->lineEdit_QTV_addressUrl->text());
 		m_pLayer->setCacheExpireDays(ui->spinBox_QTV_cacheExpireDays->value());
 		m_pLayer->UpdateLayer();
+
+		QSettings settings(QCoreApplication::applicationFilePath()+".ini",QSettings::IniFormat);
+		settings.setValue(QString("settings/nAlpha_%1").arg(m_pLayer->get_name()), ui->spinBox_QTV_Alpha->value() );
+
 	}
 
 	void layer_tiles_page::on_checkBox_QTV_connect_clicked(bool ps)
@@ -74,4 +80,10 @@ namespace QTVOSM{
 			m_pPendingTasksModel->removeRows(0,m_pPendingTasksModel->rowCount()-128);
 		ui->listView_QTV_messages->scrollToBottom();
 	}
+
+	quint8 layer_tiles_page::alphaValue() const
+	{
+		return ui->spinBox_QTV_Alpha->value() % 256;
+	}
+
 }

qtviewer_planetosm/osmtiles/layer_tiles_page.h

@@ -23,6 +23,7 @@ namespace QTVOSM{
 		~layer_tiles_page();
 		//re-translat
 		void reTransUI();
+		quint8 alphaValue() const;
 	private:
 		Ui::layer_tiles_page *ui ;
 		layer_tiles * m_pLayer ;

qtviewer_planetosm/osmtiles/layer_tiles_page.ui

@@ -84,6 +84,23 @@
        </property>
       </widget>
      </item>
+     <item>
+      <widget class="QLabel" name="label_QTV_6">
+       <property name="text">
+        <string>Aplha</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QSpinBox" name="spinBox_QTV_Alpha">
+       <property name="maximum">
+        <number>255</number>
+       </property>
+       <property name="value">
+        <number>255</number>
+       </property>
+      </widget>
+     </item>
     </layout>
    </item>
    <item>

qtviewer_planetosm/osmtiles/urlDownloader.cpp

@@ -51,8 +51,9 @@ namespace QTVOSM{
 					QString strDir = tk.str_destinDir;
 					QString strFile = tk.str_destinFile;
 					//mkdir
-					QDir dir(strDir);
-					dir.mkpath(strDir);
+					QDir dir;
+					const QString abpath = dir.absoluteFilePath(tk.str_destinDir);
+					dir.mkpath(abpath);
 					//saveFile
 					QFile file(strDir+"/"+strFile);
 					if (file.open(QIODevice::WriteOnly)==true)