added ability to scroll

displayarea.cpp

@@ -37,6 +37,8 @@ void DisplayArea::resizeImage(QImage *image, const QSize &newSize)
 {
     if(image->size()==newSize) return;
 
+    resize(newSize);
+
     QImage newImage(newSize,QImage::Format_ARGB32);
     newImage.fill(qRgba(255,255,255,0));
     QPainter painter(&newImage);

mainwindow.cpp

@@ -10,16 +10,22 @@
 #include <QDir>
 #include <QFileDialog>
 #include <QMenuBar>
+#include <QGuiApplication>
+#include <QScreen>
 
 MainWindow::MainWindow(QWidget *parent)
     : QMainWindow(parent),displayArea(new DisplayArea(this))
 {
-    setCentralWidget(displayArea);
+    displayArea->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
+    scrollArea = new QScrollArea();
+    scrollArea->setWidget(displayArea);
+    setCentralWidget(scrollArea);
 
     createActions();
     createMenus();
 
     setWindowTitle(tr("LivePow"));
+    resize(QGuiApplication::primaryScreen()->availableSize() * 3 / 5);
 }
 
 MainWindow::~MainWindow()

mainwindow.h

@@ -3,6 +3,7 @@
 
 #include <QMainWindow>
 #include <QCommandLineParser>
+#include <QScrollArea>
 
 class DisplayArea;
 class InputParser;
@@ -20,6 +21,7 @@ public:
     InputParser *parser;
 
 private:
+    QScrollArea *scrollArea;
     DisplayArea *displayArea;
     void createActions();
     void createMenus();