+ add scale_factor_ UI (QDoubleSpinBox)

demo/viewer/mainwindow.cpp

@@ -32,6 +32,7 @@
 #include <QItemDelegate>
 #include <QSlider>
 #include <QComboBox>
+#include <QDoubleSpinBox>
 
 // mapnik
 
@@ -97,12 +98,15 @@ MainWindow::MainWindow()
     //connect mapview to layerlist
     connect(mapWidget_, SIGNAL(mapViewChanged()),layerTab_, SLOT(update()));
     // slider
-    connect(slider_,SIGNAL(valueChanged(int)),mapWidget_,SLOT(zoomToLevel(int)));    
+    connect(slider_,SIGNAL(valueChanged(int)),mapWidget_,SLOT(zoomToLevel(int)));
     // renderer selector
-    connect(renderer_selector_,SIGNAL(currentIndexChanged(QString const&)), 
+    connect(renderer_selector_,SIGNAL(currentIndexChanged(QString const&)),
             mapWidget_, SLOT(updateRenderer(QString const&)));
-    
-    // 
+
+    // scale factor
+    connect(scale_factor_,SIGNAL(valueChanged(double)),
+            mapWidget_, SLOT(updateScaleFactor(double)));
+    //
     connect(layerTab_,SIGNAL(update_mapwidget()),mapWidget_,SLOT(updateMap()));
     connect(layerTab_,SIGNAL(layerSelected(int)),
             mapWidget_,SLOT(layerSelected(int)));
@@ -373,16 +377,23 @@ void MainWindow::createToolBars()
     fileToolBar->addAction(infoAct);
     fileToolBar->addAction(reloadAct);
     fileToolBar->addAction(printAct);
-    
+
     renderer_selector_ = new QComboBox(fileToolBar);
     renderer_selector_->setFocusPolicy(Qt::NoFocus);
     renderer_selector_->addItem("AGG");
 #ifdef HAVE_CAIRO
     renderer_selector_->addItem("Cairo");
 #endif
-    renderer_selector_->addItem("Grid");    
+    renderer_selector_->addItem("Grid");
     fileToolBar->addWidget(renderer_selector_);
 
+    scale_factor_ = new QDoubleSpinBox(fileToolBar);
+    scale_factor_->setMinimum(0.1);
+    scale_factor_->setMaximum(5.0);
+    scale_factor_->setSingleStep(0.1);
+    scale_factor_->setValue(1.0);
+
+    fileToolBar->addWidget(scale_factor_);
     slider_ = new QSlider(Qt::Horizontal,fileToolBar);
     slider_->setRange(1,18);
     slider_->setTickPosition(QSlider::TicksBelow);

demo/viewer/mainwindow.hpp

@@ -28,6 +28,7 @@
 #include <QActionGroup>
 #include <QStatusBar>
 #include <QAbstractItemModel>
+#include <QDoubleSpinBox>
 
 #include "mapwidget.hpp"
 
@@ -37,6 +38,7 @@ class LayerTab;
 class StyleTab;
 class QSlider;
 class QComboBox;
+class QDoubleSpinBox;
 
 class MainWindow : public QMainWindow
 {
@@ -108,6 +110,7 @@ private:
     QStatusBar *status;
     QSlider * slider_;
     QComboBox * renderer_selector_;
+    QDoubleSpinBox * scale_factor_;
     mapnik::box2d<double> default_extent_;
 };
 

demo/viewer/mapwidget.cpp

@@ -184,16 +184,16 @@ void MapWidget::mousePressEvent(QMouseEvent* e)
                   feature_ptr feat  = fs->next();
                   if (feat)
                   {
-                      
+
                       feature_kv_iterator itr(*feat,true);
                       feature_kv_iterator end(*feat);
-                      
+
                       for ( ;itr!=end; ++itr)
                       {
                           info.push_back(QPair<QString,QString>(QString(boost::get<0>(*itr).c_str()),
                                                                 boost::get<1>(*itr).to_string().c_str()));
                       }
-                      
+
                       typedef mapnik::coord_transform<mapnik::CoordTransform,mapnik::geometry_type> path_type;
 
                      for  (unsigned i=0; i<feat->num_geometries();++i)
@@ -498,12 +498,12 @@ void render_agg(mapnik::Map const& map, double scaling_factor, QPixmap & pix)
 {
     unsigned width=map.width();
     unsigned height=map.height();
-    
+
     image_32 buf(width,height);
     mapnik::agg_renderer<image_32> ren(map,buf,scaling_factor);
-    
+
     try
-    {          
+    {
         ren.apply();
         QImage image((uchar*)buf.raw_data(),width,height,QImage::Format_ARGB32);
         pix = QPixmap::fromImage(image.rgbSwapped());
@@ -527,23 +527,23 @@ void render_grid(mapnik::Map const& map, double scaling_factor, QPixmap & pix)
 {
     unsigned width=map.width();
     unsigned height=map.height();
-    
+
     mapnik::grid buf(width,height,"F_CODE", 1);
     mapnik::grid_renderer<mapnik::grid> ren(map,buf,scaling_factor);
-    
+
     try
-    {          
+    {
         ren.apply();
         int * imdata = static_cast<int*>(buf.raw_data());
-        
+
         QImage image(width,height,QImage::Format_RGB32);
         for (unsigned i = 0 ; i < height ; ++i)
-        {           
+        {
             for (unsigned j = 0 ; j < width ; ++j)
             {
                 image.setPixel(j,i,qRgb((uint8_t)(imdata[i*width+j]>>8),
                                         (uint8_t)(imdata[i*width+j+1]>>8),
-                                        (uint8_t)(imdata[i*width+j+2]>>8)));                
+                                        (uint8_t)(imdata[i*width+j+2]>>8)));
             }
         }
         pix = QPixmap::fromImage(image);
@@ -567,12 +567,12 @@ void render_cairo(mapnik::Map const& map, double scaling_factor, QPixmap & pix)
 {
 
 #ifdef HAVE_CAIRO
-    Cairo::RefPtr<Cairo::ImageSurface> image_surface = 
+    Cairo::RefPtr<Cairo::ImageSurface> image_surface =
         Cairo::ImageSurface::create(Cairo::FORMAT_ARGB32, map.width(),map.height());
-    
+
     mapnik::cairo_renderer<Cairo::Surface> png_render(map, image_surface, scaling_factor);
     png_render.apply();
-    
+
     image_32 buf(image_surface);
     QImage image((uchar*)buf.raw_data(),buf.width(),buf.height(),QImage::Format_ARGB32);
     pix = QPixmap::fromImage(image.rgbSwapped());
@@ -588,6 +588,12 @@ void MapWidget::updateRenderer(QString const& txt)
     updateMap();
 }
 
+void MapWidget::updateScaleFactor(double scale_factor)
+{
+    set_scaling_factor(scale_factor);
+    updateMap();
+}
+
 void MapWidget::updateMap()
 {
    if (map_)
@@ -611,7 +617,7 @@ void MapWidget::updateMap()
 
        try
        {
-          projection prj(map_->srs()); // map projection         
+          projection prj(map_->srs()); // map projection
           box2d<double> ext = map_->get_current_extent();
           double x0 = ext.minx();
           double y0 = ext.miny();
@@ -623,7 +629,7 @@ void MapWidget::updateMap()
           update();
           // emit signal to interested widgets
           emit mapViewChanged();
-      }      
+      }
       catch (...)
       {
           std::cerr << "Unknown exception caught!\n";

demo/viewer/mapwidget.hpp

@@ -53,8 +53,8 @@ public:
         AGG,
         Cairo,
         Grid
-    };    
-    
+    };
+
 private:
     boost::shared_ptr<mapnik::Map> map_;
     int selected_;
@@ -91,6 +91,7 @@ public slots:
     void updateMap();
     void layerSelected(int);
     void updateRenderer(QString const& txt);
+    void updateScaleFactor(double scale_factor);
 signals:
     void mapViewChanged();
 protected: