From 7cd5faf8cfed1871195aed7a4c325342172944b3 Mon Sep 17 00:00:00 2001
From: Joel Holdsworth <joel@airwebreathe.org.uk>
Date: Sat, 16 Jun 2012 12:28:28 +0100
Subject: [PATCH 1/1] Initial interractive zoom support

---
 logicsignal.cpp | 21 +++++++++++++++------
 signaldata.cpp  | 10 ++++++++++
 signaldata.h    |  4 ++++
 sigview.cpp     | 30 ++++++++++++++++++++++++++++++
 sigview.h       |  5 +++++
 5 files changed, 64 insertions(+), 6 deletions(-)

diff --git a/logicsignal.cpp b/logicsignal.cpp
index 1587bddd..584be441 100644
--- a/logicsignal.cpp
+++ b/logicsignal.cpp
@@ -22,6 +22,8 @@
 #include <GL/gl.h>
 #include <GL/glext.h>
 
+#include <math.h>
+
 #include "logicdata.h"
 #include "logicdatasnapshot.h"
 #include "logicsignal.h"
@@ -29,6 +31,8 @@
 using namespace boost;
 using namespace std;
 
+const float Log2 = logf(2.0f);
+
 LogicSignal::LogicSignal(QString name, shared_ptr<LogicData> data,
 	int probe_index) :
 	Signal(name),
@@ -54,9 +58,14 @@ void LogicSignal::paint(QGLWidget &widget, const QRect &rect,
 
 	const shared_ptr<LogicDataSnapshot> &snapshot = snapshots.front();
 
-	const int64_t start = 0;
-	const int64_t end = 8000;
-	const int64_t quantization_length = 4;
+	const uint64_t samplerate = _data->get_samplerate();
+	const int64_t start_time = _data->get_start_time();
+	const float samples_per_pixel = samplerate * scale / 1e15f;
+	const int64_t start = samplerate * (offset - start_time) /
+		1000000000000000ULL;
+	const int64_t end = start + samples_per_pixel * rect.width();
+	const int64_t quantization_length = 1LL << (int64_t)floorf(
+		max(logf(samples_per_pixel / Log2), 0.0f));
 
 	snapshot->get_subsampled_edges(edges, start, end,
 		quantization_length, _probe_index);
@@ -69,7 +78,7 @@ void LogicSignal::paint(QGLWidget &widget, const QRect &rect,
 	for(vector<LogicDataSnapshot::EdgePair>::const_iterator i = edges.begin() + 1;
 	    i != edges.end() - 1; i++)
 	{
-		const int x = edge.first / quantization_length +
+		const int x = (int)((*i).first / samples_per_pixel) +
 			rect.left();
 
 		vertex->x = x, vertex->y = 10 + rect.top() - 1;
@@ -92,12 +101,12 @@ void LogicSignal::paint(QGLWidget &widget, const QRect &rect,
 	{
 		const int y = ((*i).second ? 10 : 40) + rect.top();
 
-		vertex->x = (*i).first / quantization_length +
+		vertex->x = (int)((*i).first / samples_per_pixel) +
 			rect.left() - 1;
 		vertex->y = y;
 		vertex++;
 
-		vertex->x = (*(i+1)).first / quantization_length +
+		vertex->x = (int)((*(i+1)).first / samples_per_pixel) +
 			rect.left();
 		vertex->y = y;
 		vertex++;
diff --git a/signaldata.cpp b/signaldata.cpp
index fbc10133..0ddb34a7 100644
--- a/signaldata.cpp
+++ b/signaldata.cpp
@@ -27,3 +27,13 @@ SignalData::SignalData(uint64_t samplerate) :
 	_start_time(0)
 {
 }
+
+uint64_t SignalData::get_samplerate() const
+{
+	return _samplerate;
+}
+
+int64_t SignalData::get_start_time() const
+{
+	return _start_time;
+}
\ No newline at end of file
diff --git a/signaldata.h b/signaldata.h
index 18c9b3d5..67ff2960 100644
--- a/signaldata.h
+++ b/signaldata.h
@@ -25,6 +25,10 @@ class SignalData
 public:
 	SignalData(uint64_t samplerate);
 
+public:
+	uint64_t get_samplerate() const;
+	int64_t get_start_time() const;
+
 protected:
 	const uint64_t _samplerate;
 	const int64_t _start_time;
diff --git a/sigview.cpp b/sigview.cpp
index 53fbdeaa..df1eefec 100644
--- a/sigview.cpp
+++ b/sigview.cpp
@@ -23,6 +23,8 @@
 #include "sigsession.h"
 #include "signal.h"
 
+#include <QMouseEvent>
+
 #include <boost/foreach.hpp>
 
 using namespace boost;
@@ -82,3 +84,31 @@ void SigView::dataUpdated()
 	update();
 }
 
+void SigView::mouseMoveEvent(QMouseEvent *event)
+{
+	assert(event);
+}
+
+void SigView::mousePressEvent(QMouseEvent *event)
+{
+	assert(event);
+}
+
+void SigView::mouseReleaseEvent(QMouseEvent *event)
+{
+	assert(event);
+
+	switch(event->button())
+	{
+	case Qt::LeftButton:
+		_scale = (_scale * 2) / 3;
+		break;
+
+	case Qt::RightButton:
+		_scale = (_scale * 3) / 2;
+		break;
+	}
+
+	updateGL();
+}
+
diff --git a/sigview.h b/sigview.h
index 2c7ba1dd..ccbc8c84 100644
--- a/sigview.h
+++ b/sigview.h
@@ -44,6 +44,11 @@ protected:
 
 	void paintGL();
 
+private:
+	void mouseMoveEvent(QMouseEvent *event);
+	void mousePressEvent(QMouseEvent *event);
+	void mouseReleaseEvent(QMouseEvent *event);
+
 private slots:
 	void dataUpdated();
 
-- 
2.30.2