X-Git-Url: https://sigrok.org/gitweb/?p=pulseview.git;a=blobdiff_plain;f=sigview.cpp;h=a8e8535923d5a2acfc1a1aa2ae84ec804315d434;hp=cf0983d90ba2b0cefbb798f1edcc9dda697f4f39;hb=dde1a56346815349ed4e3cc1c5c63c2ffbc6c7b7;hpb=3e46726aaf1cfe749c8f3fced7b455cf01a03c86

diff --git a/sigview.cpp b/sigview.cpp
index cf0983d9..a8e85359 100644
--- a/sigview.cpp
+++ b/sigview.cpp
@@ -23,7 +23,12 @@
 #include "sigsession.h"
 #include "signal.h"
 
+#include "extdef.h"
+
 #include <QMouseEvent>
+#include <QTextStream>
+
+#include <math.h>
 
 #include <boost/foreach.hpp>
 
@@ -32,6 +37,14 @@ using namespace std;
 
 const int SigView::SignalHeight = 50;
 const int SigView::LabelMarginWidth = 70;
+const int SigView::RulerHeight = 30;
+
+const int SigView::MinorTickSubdivision = 4;
+const int SigView::ScaleUnits[3] = {1, 2, 5};
+
+const QString SigView::SIPrefixes[9] =
+	{"f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G"};
+const int SigView::FirstSIPrefixPower = -15;
 
 SigView::SigView(SigSession &session, QWidget *parent) :
 	QGLWidget(parent),
@@ -73,7 +86,7 @@ void SigView::paintEvent(QPaintEvent *event)
 	glClear(GL_COLOR_BUFFER_BIT);
 
 	// Plot the signal
-	offset = 0;
+	offset = RulerHeight;
 	BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
 	{
 		assert(s);
@@ -93,8 +106,8 @@ void SigView::paintEvent(QPaintEvent *event)
 	QPainter painter(this);
 	painter.setRenderHint(QPainter::Antialiasing);
 
-	// Paint the label
-	offset = 0;
+	// Paint the labels
+	offset = RulerHeight;
 	BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
 	{
 		assert(s);
@@ -106,6 +119,9 @@ void SigView::paintEvent(QPaintEvent *event)
 		offset += SignalHeight;
 	}
 
+	// Paint the ruler
+	paintRuler(painter);
+
 	painter.end();
 }
 
@@ -154,3 +170,65 @@ void SigView::setupViewport(int width, int height)
 	glOrtho(0, width, height, 0, -1, 1);
 	glMatrixMode(GL_MODELVIEW);
 }
+
+void SigView::paintRuler(QPainter &p)
+{
+	const double MinSpacing = 80;
+
+	const double min_period = _scale * MinSpacing;
+
+	const int order = (int)floorf(log10f(min_period));
+	const double order_decimal = pow(10, order);
+
+	int unit = 0;
+	double tick_period = 0.0f;
+
+	do
+	{
+		tick_period = order_decimal * ScaleUnits[unit++];
+	} while(tick_period < min_period && unit < countof(ScaleUnits));
+
+	const int prefix = (order - FirstSIPrefixPower) / 3;
+	assert(prefix >= 0);
+	assert(prefix < countof(SIPrefixes));
+
+	const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX,
+		Qt::AlignLeft | Qt::AlignTop, "8").height();
+
+	// Draw the tick marks
+	p.setPen(Qt::black);
+
+	const double minor_tick_period = tick_period / MinorTickSubdivision;
+	const double first_major_division = floor(_offset / tick_period);
+	const double first_minor_division = ceil(_offset / minor_tick_period);
+	const double t0 = first_major_division * tick_period;
+
+	int division = (int)round(first_minor_division -
+		first_major_division * MinorTickSubdivision);
+	while(1)
+	{
+		const double t = t0 + division * minor_tick_period;
+		const double x = (t - _offset) / _scale + LabelMarginWidth;
+
+		if(x >= width())
+			break;
+
+		if(division % MinorTickSubdivision == 0)
+		{
+			// Draw a major tick
+			QString s;
+			QTextStream ts(&s);
+			ts << (t / order_decimal) << SIPrefixes[prefix] << "s";
+			p.drawText(x, 0, 0, text_height, Qt::AlignCenter | Qt::AlignTop |
+				Qt::TextDontClip, s);
+			p.drawLine(x, text_height, x, RulerHeight);
+		}
+		else
+		{
+			// Draw a minor tick
+			p.drawLine(x, (text_height + RulerHeight) / 2, x, RulerHeight);
+		}
+
+		division++;
+	}
+}