+ add scale_factor_ UI (QDoubleSpinBox)

demo/viewer/mainwindow.cpp

@@ -32,6 +32,7 @@
 #include <QItemDelegate>
 #include <QSlider>
 #include <QComboBox>
+#include <QDoubleSpinBox>
 
 // mapnik
 
@@ -102,6 +103,9 @@ MainWindow::MainWindow()
     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)),
@@ -383,6 +387,13 @@ void MainWindow::createToolBars()
     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

@@ -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_)

demo/viewer/mapwidget.hpp

@@ -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: