From ca97f1bd709a154f73c9e28f8a50c5b409baab3e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Karel=20Ko=C4=8D=C3=AD?= <cynerd@email.cz>
Date: Fri, 5 Jan 2018 23:42:36 +0100
Subject: Fix how we handle scale of GraphicView

That widget is seriously buggy.. grr
---
 qtmips_gui/coreview.cpp | 29 +++++++++++++++++++++++------
 qtmips_gui/coreview.h   |  5 ++++-
 2 files changed, 27 insertions(+), 7 deletions(-)

(limited to 'qtmips_gui')

diff --git a/qtmips_gui/coreview.cpp b/qtmips_gui/coreview.cpp
index 7210f1c..2546c2b 100644
--- a/qtmips_gui/coreview.cpp
+++ b/qtmips_gui/coreview.cpp
@@ -1,16 +1,33 @@
 #include "coreview.h"
 
 CoreView::CoreView(QWidget *parent) : QGraphicsView(parent) {
-    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
-    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
     setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
 
-    // TODO fitInView doesn't work as I want so reimplement or do something with it
-    //fitInView(0, 0, 201, 201, Qt::KeepAspectRatioByExpanding);
+    setSceneRect(0, 0, scene_width, scene_height);
+    update_scale();
 }
 
-void CoreView::resizeEvent(QResizeEvent *event __attribute__((unused))) {
-    // fitInView(0, 0, 201, 201, Qt::KeepAspectRatioByExpanding);
+void CoreView::resizeEvent(QResizeEvent *event) {
+    QGraphicsView::resizeEvent(event);
+    update_scale();
+}
+
+void CoreView::update_scale() {
+    // 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);
 }
 
 CoreViewScene::CoreViewScene(CoreView *view, machine::QtMipsMachine *machine) : QGraphicsScene(view) {
diff --git a/qtmips_gui/coreview.h b/qtmips_gui/coreview.h
index fddcafe..52b98ee 100644
--- a/qtmips_gui/coreview.h
+++ b/qtmips_gui/coreview.h
@@ -14,8 +14,11 @@ class CoreView : public QGraphicsView {
 public:
     CoreView(QWidget *parent);
 
-private:
+protected:
     void resizeEvent(QResizeEvent *event);
+private:
+    const int scene_width = 800, scene_height = 800;
+    void update_scale();
 };
 
 class CoreViewScene : public QGraphicsScene {
-- 
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