From ca46b5342f79e4786b973c83ed6a4cde5a51908d Mon Sep 17 00:00:00 2001
From: Joel Holdsworth <joel@airwebreathe.org.uk>
Date: Mon, 2 Dec 2013 21:03:14 +0000
Subject: [PATCH] Implemented zoom-fit

---
 pulseview.qrc     |  1 +
 pv/mainwindow.cpp | 16 ++++++++++++++++
 pv/mainwindow.h   |  2 ++
 pv/view/view.cpp  | 39 +++++++++++++++++++++++++++++++++++++++
 pv/view/view.h    |  2 ++
 5 files changed, 60 insertions(+)

diff --git a/pulseview.qrc b/pulseview.qrc
index a7108b4..6830e00 100644
--- a/pulseview.qrc
+++ b/pulseview.qrc
@@ -15,6 +15,7 @@
 	<file>icons/trigger-low.svg</file>
 	<file>icons/trigger-none.svg</file>
 	<file>icons/trigger-rising.svg</file>
+	<file>icons/zoom-fit.png</file>
 	<file>icons/zoom-in.png</file>
 	<file>icons/zoom-out.png</file>
     </qresource>
diff --git a/pv/mainwindow.cpp b/pv/mainwindow.cpp
index 45e804d..5485ea7 100644
--- a/pv/mainwindow.cpp
+++ b/pv/mainwindow.cpp
@@ -160,6 +160,16 @@ void MainWindow::setup_ui()
 		QString::fromUtf8("actionViewZoomOut"));
 	menu_view->addAction(action_view_zoom_out);
 
+	QAction *const action_view_zoom_fit = new QAction(this);
+	action_view_zoom_fit->setText(QApplication::translate(
+		"MainWindow", "Zoom to &Fit", 0, QApplication::UnicodeUTF8));
+	action_view_zoom_fit->setIcon(QIcon::fromTheme("zoom-fit",
+		QIcon(":/icons/zoom-fit.png")));
+	action_view_zoom_fit->setShortcut(QKeySequence(Qt::Key_F));
+	action_view_zoom_fit->setObjectName(
+		QString::fromUtf8("actionViewZoomFit"));
+	menu_view->addAction(action_view_zoom_fit);
+
 	menu_view->addSeparator();
 
 	QAction *action_view_show_cursors = new QAction(this);
@@ -211,6 +221,7 @@ void MainWindow::setup_ui()
 	toolbar->addSeparator();
 	toolbar->addAction(action_view_zoom_in);
 	toolbar->addAction(action_view_zoom_out);
+	toolbar->addAction(action_view_zoom_fit);
 	addToolBar(toolbar);
 
 	// Setup the sampling bar
@@ -329,6 +340,11 @@ void MainWindow::on_actionViewZoomOut_triggered()
 	_view->zoom(-1);
 }
 
+void MainWindow::on_actionViewZoomFit_triggered()
+{
+	_view->zoom_fit();
+}
+
 void MainWindow::on_actionViewShowCursors_triggered()
 {
 	assert(_view);
diff --git a/pv/mainwindow.h b/pv/mainwindow.h
index 88f6272..8895a5e 100644
--- a/pv/mainwindow.h
+++ b/pv/mainwindow.h
@@ -89,6 +89,8 @@ private slots:
 
 	void on_actionViewZoomOut_triggered();
 
+	void on_actionViewZoomFit_triggered();
+
 	void on_actionViewShowCursors_triggered();
 
 	void on_actionAbout_triggered();
diff --git a/pv/view/view.cpp b/pv/view/view.cpp
index 4cfb397..abf522c 100644
--- a/pv/view/view.cpp
+++ b/pv/view/view.cpp
@@ -24,6 +24,8 @@
 #include <limits.h>
 #include <math.h>
 
+#include <set>
+
 #include <boost/foreach.hpp>
 
 #include <QEvent>
@@ -153,6 +155,43 @@ void View::zoom(double steps, int offset)
 	set_scale_offset(new_scale, new_offset);
 }
 
+void View::zoom_fit()
+{
+	using pv::data::SignalData;
+
+	const vector< shared_ptr<Signal> > sigs(
+		session().get_signals());
+
+	// Make a set of all the visible data objects
+	set< shared_ptr<SignalData> > visible_data;
+	BOOST_FOREACH(const shared_ptr<Signal> sig, sigs)
+		if (sig->enabled())
+			visible_data.insert(sig->data());
+
+	if (visible_data.empty())
+		return;
+
+	double left_time = DBL_MAX, right_time = DBL_MIN;
+	BOOST_FOREACH(const shared_ptr<SignalData> d, visible_data)
+	{
+		const double start_time = d->get_start_time();
+		left_time = min(left_time, start_time);
+		right_time = max(right_time, start_time +
+			d->get_max_sample_count() / d->get_samplerate());
+	}
+
+	assert(left_time < right_time);
+	if (right_time - left_time < 1e-12)
+		return;
+
+	assert(_viewport);
+	const int w = _viewport->width();
+	if (w <= 0)
+		return;
+
+	set_scale_offset((right_time - left_time) / w, left_time);	
+}
+
 void View::set_scale_offset(double scale, double offset)
 {
 	_scale = scale;
diff --git a/pv/view/view.h b/pv/view/view.h
index c25ed78..bc99bdd 100644
--- a/pv/view/view.h
+++ b/pv/view/view.h
@@ -86,6 +86,8 @@ public:
 	void zoom(double steps);
 	void zoom(double steps, int offset);
 
+	void zoom_fit();
+
 	/**
 	 * Sets the scale and offset.
 	 * @param scale The new view scale in seconds per pixel.
-- 
2.30.2