1 files changed, 36 insertions, 0 deletions
diff --git a/qtmips_gui/graphicsview.cpp b/qtmips_gui/graphicsview.cpp
new file mode 100644
index 0000000..6ef118d
--- /dev/null
+++ b/qtmips_gui/graphicsview.cpp
@@ -0,0 +1,36 @@
+#include "graphicsview.h"
+
+GraphicsView::GraphicsView(QWidget *parent) : QGraphicsView(parent) {
+    setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
+}
+
+void GraphicsView::setScene(QGraphicsScene *scene) {
+    QGraphicsView::setScene(scene);
+    update_scale();
+}
+
+void GraphicsView::resizeEvent(QResizeEvent *event) {
+    QGraphicsView::resizeEvent(event);
+    update_scale();
+}
+
+void GraphicsView::update_scale() {
+    if (scene() == nullptr)
+        return; // Skip if we have no scene
+
+    // Note: there is somehow three pixels error when viewing so we have to always compensate
+    const int w = scene()->width() + 3;
+    const int h = scene()->height() + 3;
+
+    qreal scale = 1;
+    if (height() > h && width() > w) {
+        if (height() > width()) {
+            scale = (qreal)width() / w;
+        } else {
+            scale = (qreal)height() / h;
+        }
+    }
+    QTransform t;
+    t.scale(scale, scale);
+    setTransform(t, false);
+}