From 49bc0a1d3e8c4a2e208ce6a7614bc34adb6f8a7a Mon Sep 17 00:00:00 2001
From: Aqua-sama <aqua@iserlohn-fortress.net>
Date: Sun, 1 Nov 2020 21:48:01 +0200
Subject: Scale bar now rescales image

---
 src/mainwindow.cpp | 35 +++++++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 10 deletions(-)

(limited to 'src/mainwindow.cpp')

diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index 839b2c3..447cf0c 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -13,26 +13,41 @@ MainWindow::MainWindow(const QStringList &filePaths, QWidget *parent)
   if (!filePaths.isEmpty()) {
     current.load(filePaths.first());
     setWindowTitle(title_format.arg(filePaths.first()));
-    resizePixmap();
+    fit();
   }
 
-  connect(ui->original_toolButton, &QToolButton::clicked, this,
-          [this]() { ui->label->setPixmap(current); });
+  connect(ui->ori_toolButton, &QToolButton::clicked, [this]() { scale(1.0); });
+  connect(ui->fit_toolButton, &QToolButton::clicked, [this]() { fit(); });
 
-  connect(ui->fit_toolButton, &QToolButton::clicked, this,
-          [this]() { resizePixmap(); });
+  connect(ui->scale_slider, &QSlider::sliderMoved,
+          [this](int value) { scale(static_cast<double>(value) / 100.0f); });
 }
 
 MainWindow::~MainWindow() { delete ui; }
 
 void MainWindow::resizeEvent(QResizeEvent *event) {
-  resizePixmap();
+  fit();
   QMainWindow::resizeEvent(event);
 }
 
-void MainWindow::resizePixmap() {
-  const auto size =
-      ui->scrollArea->viewport()->size().boundedTo(current.size());
+void MainWindow::fit() {
+  const auto pixmpSize = current.size();
+  const auto scaleSize =
+      pixmpSize.scaled(ui->scrollArea->viewport()->size(), Qt::KeepAspectRatio);
+
+  const int scale = std::min(scaleSize.width() * 100 / pixmpSize.width(),
+                             scaleSize.height() * 100 / pixmpSize.height());
+
+  ui->label->setPixmap(
+      current.scaled(scaleSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
+  ui->scale_slider->setValue(scale);
+  ui->scale_label->setText(scale_format.arg(scale));
+}
+
+void MainWindow::scale(double scale) {
+  const auto scaleSize = current.size() * scale;
   ui->label->setPixmap(
-      current.scaled(size, Qt::KeepAspectRatio, Qt::SmoothTransformation));
+      current.scaled(scaleSize, Qt::KeepAspectRatio, Qt::SmoothTransformation));
+  ui->scale_slider->setValue(scale * 100);
+  ui->scale_label->setText(scale_format.arg(scale * 100));
 }
-- 
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