+/*
+ * This file is part of the sigrok project.
+ *
+ * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "sigviewport.h"
+
+#include "sigsession.h"
+#include "signal.h"
+
+#include "extdef.h"
+
+#include <QMouseEvent>
+#include <QTextStream>
+
+#include <math.h>
+
+#include <boost/foreach.hpp>
+
+using namespace boost;
+using namespace std;
+
+const double SigViewport::MaxScale = 1e9;
+const double SigViewport::MinScale = 1e-15;
+
+const int SigViewport::SignalHeight = 50;
+const int SigViewport::LabelMarginWidth = 70;
+const int SigViewport::RulerHeight = 30;
+
+const int SigViewport::MinorTickSubdivision = 4;
+const int SigViewport::ScaleUnits[3] = {1, 2, 5};
+
+const QString SigViewport::SIPrefixes[9] =
+ {"f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G"};
+const int SigViewport::FirstSIPrefixPower = -15;
+
+SigViewport::SigViewport(SigSession &session, QWidget *parent) :
+ QGLWidget(parent),
+ _session(session),
+ _scale(1e-6),
+ _offset(0)
+{
+ connect(&_session, SIGNAL(data_updated()),
+ this, SLOT(data_updated()));
+
+ setMouseTracking(true);
+ setAutoFillBackground(false);
+}
+
+void SigViewport::zoom(double steps)
+{
+ zoom(steps, (width() - LabelMarginWidth) / 2);
+}
+
+void SigViewport::initializeGL()
+{
+}
+
+void SigViewport::resizeGL(int width, int height)
+{
+ setup_viewport(width, height);
+}
+
+void SigViewport::paintEvent(QPaintEvent *event)
+{
+ int offset;
+
+ const vector< shared_ptr<Signal> > &sigs =
+ _session.get_signals();
+
+ // Prepare for OpenGL rendering
+ makeCurrent();
+ glMatrixMode(GL_MODELVIEW);
+ glPushMatrix();
+
+ 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)
+ {
+ assert(s);
+
+ const QRect signal_rect(LabelMarginWidth, offset,
+ width() - LabelMarginWidth, SignalHeight);
+
+ s->paint(*this, signal_rect, _scale, _offset);
+
+ offset += SignalHeight;
+ }
+
+ glDisable(GL_SCISSOR_TEST);
+
+ // Prepare for QPainter rendering
+ glMatrixMode(GL_MODELVIEW);
+ glPopMatrix();
+
+ QPainter painter(this);
+ painter.setRenderHint(QPainter::Antialiasing);
+
+ // Paint the labels
+ offset = RulerHeight;
+ BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
+ {
+ assert(s);
+
+ const QRect label_rect(0, offset,
+ LabelMarginWidth, SignalHeight);
+ s->paint_label(painter, label_rect);
+
+ offset += SignalHeight;
+ }
+
+ // Paint the ruler
+ paint_ruler(painter);
+
+ painter.end();
+}
+
+void SigViewport::data_updated()
+{
+ update();
+}
+
+void SigViewport::mousePressEvent(QMouseEvent *event)
+{
+ assert(event);
+
+ _mouse_down_point = event->pos();
+ _mouse_down_offset = _offset;
+}
+
+void SigViewport::mouseMoveEvent(QMouseEvent *event)
+{
+ assert(event);
+
+ if(event->buttons() & Qt::LeftButton)
+ {
+ _offset = _mouse_down_offset + (_mouse_down_point - event->pos()).x() * _scale;
+ update();
+ }
+}
+
+void SigViewport::mouseReleaseEvent(QMouseEvent *event)
+{
+ assert(event);
+}
+
+void SigViewport::wheelEvent(QWheelEvent *event)
+{
+ assert(event);
+ zoom(event->delta() / 120, event->x() - LabelMarginWidth);
+}
+
+void SigViewport::setup_viewport(int width, int height)
+{
+ glViewport(0, 0, (GLint)width, (GLint)height);
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glOrtho(0, width, height, 0, -1, 1);
+ glMatrixMode(GL_MODELVIEW);
+}
+
+void SigViewport::paint_ruler(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++;
+ }
+}
+
+void SigViewport::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();
+}
projects / pulseview.git / commitdiff