X-Git-Url: https://sigrok.org/gitweb/?p=pulseview.git;a=blobdiff_plain;f=sigview.cpp;h=5601be575d722df78302897fa19965fe3280464e;hp=554e534eb03b0d93cf25d2aebefbccdaaaaa2ead;hb=a429590b40f74cebd13986bb1b4c06a4b47d8815;hpb=e9c41f8ce607164040ce86abd35a0a8751193f1f

diff --git a/sigview.cpp b/sigview.cpp
index 554e534e..5601be57 100644
--- a/sigview.cpp
+++ b/sigview.cpp
@@ -26,6 +26,7 @@
 #include "extdef.h"
 
 #include <QMouseEvent>
+#include <QTextStream>
 
 #include <math.h>
 
@@ -34,32 +35,45 @@
 using namespace boost;
 using namespace std;
 
+const double SigView::MaxScale = 1e9;
+const double SigView::MinScale = 1e-15;
+
 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),
         _session(session),
 	_scale(1e-6),
 	_offset(0)
 {
-	connect(&_session, SIGNAL(dataUpdated()),
-		this, SLOT(dataUpdated()));
+	connect(&_session, SIGNAL(data_updated()),
+		this, SLOT(data_updated()));
 
 	setMouseTracking(true);
 	setAutoFillBackground(false);
 }
 
+void SigView::zoom(double steps)
+{
+	zoom(steps, (width() - LabelMarginWidth) / 2);
+}
+
 void SigView::initializeGL()
 {
 }
 
 void SigView::resizeGL(int width, int height)
 {
-	setupViewport(width, height);
+	setup_viewport(width, height);
 }
 
 void SigView::paintEvent(QPaintEvent *event)
@@ -74,12 +88,14 @@ void SigView::paintEvent(QPaintEvent *event)
 	glMatrixMode(GL_MODELVIEW);
 	glPushMatrix();
 
-	setupViewport(width(), height());
+	setup_viewport(width(), height());
 
 	qglClearColor(Qt::white);
 	glClear(GL_COLOR_BUFFER_BIT);
 
 	// Plot the signal
+	glEnable(GL_SCISSOR_TEST);
+	glScissor(LabelMarginWidth, 0, width(), height());
 	offset = RulerHeight;
 	BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
 	{
@@ -93,6 +109,8 @@ void SigView::paintEvent(QPaintEvent *event)
 		offset += SignalHeight;
 	}
 
+	glDisable(GL_SCISSOR_TEST);
+
 	// Prepare for QPainter rendering
 	glMatrixMode(GL_MODELVIEW);
 	glPopMatrix();
@@ -114,49 +132,47 @@ void SigView::paintEvent(QPaintEvent *event)
 	}
 
 	// Paint the ruler
-	paintRuler(painter);
+	paint_ruler(painter);
 
 	painter.end();
 }
 
-void SigView::dataUpdated()
+void SigView::data_updated()
 {
 	update();
 }
 
-void SigView::mouseMoveEvent(QMouseEvent *event)
-{
-	assert(event);
-}
-
 void SigView::mousePressEvent(QMouseEvent *event)
 {
 	assert(event);
+
+	_mouse_down_point = event->pos();
+	_mouse_down_offset = _offset;
 }
 
-void SigView::mouseReleaseEvent(QMouseEvent *event)
+void SigView::mouseMoveEvent(QMouseEvent *event)
 {
 	assert(event);
 
-	const double cursor_offset = _offset + _scale * (double)event->x();
-
-	switch(event->button())
+	if(event->buttons() & Qt::LeftButton)
 	{
-	case Qt::LeftButton:
-		_scale *= 2.0 / 3.0;
-		break;
-
-	case Qt::RightButton:
-		_scale *= 3.0 / 2.0;
-		break;
+		_offset = _mouse_down_offset + (_mouse_down_point - event->pos()).x() * _scale;
+		update();
 	}
+}
 
-	_offset = cursor_offset - _scale * (double)event->x();
+void SigView::mouseReleaseEvent(QMouseEvent *event)
+{
+	assert(event);
+}
 
-	update();
+void SigView::wheelEvent(QWheelEvent *event)
+{
+	assert(event);
+	zoom(event->delta() / 120, event->x() - LabelMarginWidth);
 }
 
-void SigView::setupViewport(int width, int height)
+void SigView::setup_viewport(int width, int height)
 {
 	glViewport(0, 0, (GLint)width, (GLint)height);
 	glMatrixMode(GL_PROJECTION);
@@ -165,38 +181,73 @@ void SigView::setupViewport(int width, int height)
 	glMatrixMode(GL_MODELVIEW);
 }
 
-void SigView::paintRuler(QPainter &p)
+void SigView::paint_ruler(QPainter &p)
 {
-	const double MinSpacing = 20;
+	const double MinSpacing = 80;
 
-	double tick_period = 0.0f;
 	const double min_period = _scale * MinSpacing;
 
-	double order = 10e-15;
-	while(tick_period < min_period)
+	const int order = (int)floorf(log10f(min_period));
+	const double order_decimal = pow(10, order);
+
+	int unit = 0;
+	double tick_period = 0.0f;
+
+	do
 	{
-		int unit = 0;
-		while(tick_period < min_period &&
-			unit < countof(ScaleUnits))
-			tick_period = order * ScaleUnits[unit++];
-		order *= 10;
-	}
+		tick_period = order_decimal * ScaleUnits[unit++];
+	} while(tick_period < min_period && unit < countof(ScaleUnits));
 
-	const double tick_seperation = tick_period / _scale;
+	const int prefix = (order - FirstSIPrefixPower) / 3;
+	assert(prefix >= 0);
+	assert(prefix < countof(SIPrefixes));
 
-	p.setPen(Qt::transparent);
-	p.setBrush(QColor(0xC0, 0xC0, 0xC0));
-	p.drawRect(LabelMarginWidth, 0,
-		width() - LabelMarginWidth, RulerHeight);
+	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 offset_ticks = -_offset / tick_period;
-	double x = (offset_ticks - floor(offset_ticks)) *
-		tick_seperation + LabelMarginWidth;
-	while(x < width())
+	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)
 	{
-		p.drawLine(x, 0, x, RulerHeight);
-		x += tick_seperation;
+		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++;
 	}
 }
+
+void SigView::zoom(double steps, int offset)
+{
+	const double cursor_offset = _offset + _scale * offset;
+	_scale *= pow(3.0/2.0, -steps);
+	_scale = max(min(_scale, MaxScale), MinScale);
+	_offset = cursor_offset - _scale * offset;
+	update();
+}