#include "ruler.hpp"
#include "view.hpp"
-#include <pv/util.hpp>
-
using namespace Qt;
using std::shared_ptr;
connect(&view_, SIGNAL(hover_point_changed()),
this, SLOT(hover_point_changed()));
+ connect(&view_, SIGNAL(offset_changed()),
+ this, SLOT(invalidate_tick_position_cache()));
+ connect(&view_, SIGNAL(scale_changed()),
+ this, SLOT(invalidate_tick_position_cache()));
+ connect(&view_, SIGNAL(tick_prefix_changed()),
+ this, SLOT(invalidate_tick_position_cache()));
+ connect(&view_, SIGNAL(tick_precision_changed()),
+ this, SLOT(invalidate_tick_position_cache()));
+ connect(&view_, SIGNAL(tick_period_changed()),
+ this, SLOT(invalidate_tick_position_cache()));
+ connect(&view_, SIGNAL(time_unit_changed()),
+ this, SLOT(invalidate_tick_position_cache()));
}
QSize Ruler::sizeHint() const
void Ruler::paintEvent(QPaintEvent*)
{
- const int ValueMargin = 3;
-
- QPainter p(this);
- p.setRenderHint(QPainter::Antialiasing);
-
- const double tick_period = view_.tick_period();
-
- // Draw the tick marks
- p.setPen(palette().color(foregroundRole()));
-
- const double minor_tick_period = tick_period / MinorTickSubdivision;
- const pv::util::Timestamp first_major_division =
- floor(view_.offset() / tick_period);
- const pv::util::Timestamp first_minor_division =
- ceil(view_.offset() / minor_tick_period);
- const pv::util::Timestamp t0 = first_major_division * tick_period;
+ if (!tick_position_cache_) {
+ auto ffunc = [this](const pv::util::Timestamp& t)
+ {
+ return util::format_time(
+ t,
+ this->view_.tick_prefix(),
+ this->view_.time_unit(),
+ this->view_.tick_precision());
+ };
+
+ tick_position_cache_.emplace(calculate_tick_positions(
+ view_.tick_period(),
+ view_.offset(),
+ view_.scale(),
+ width(),
+ ffunc));
+ }
- int division = (round(first_minor_division -
- first_major_division * MinorTickSubdivision)).convert_to<int>() - 1;
+ const int ValueMargin = 3;
const int text_height = calculate_text_height();
const int ruler_height = RulerHeight * text_height;
const int major_tick_y1 = text_height + ValueMargin * 2;
const int minor_tick_y1 = (major_tick_y1 + ruler_height) / 2;
- double x;
+ QPainter p(this);
+ p.setRenderHint(QPainter::Antialiasing);
- do {
- const pv::util::Timestamp t = t0 + division * minor_tick_period;
- x = ((t - view_.offset()) / view_.scale()).convert_to<double>();
+ // Draw the tick marks
+ p.setPen(palette().color(foregroundRole()));
- if (division % MinorTickSubdivision == 0)
- {
- // Draw a major tick
- p.drawText(x, ValueMargin, 0, text_height,
- AlignCenter | AlignTop | TextDontClip,
- util::format_time(t, view_.tick_prefix(), view_.time_unit(),
- view_.tick_precision()));
- p.drawLine(QPointF(x, major_tick_y1),
- QPointF(x, ruler_height));
- }
- else
- {
- // Draw a minor tick
- p.drawLine(QPointF(x, minor_tick_y1),
- QPointF(x, ruler_height));
- }
+ for (const auto& tick: tick_position_cache_->major) {
+ p.drawText(tick.first, ValueMargin, 0, text_height,
+ AlignCenter | AlignTop | TextDontClip, tick.second);
+ p.drawLine(QPointF(tick.first, major_tick_y1),
+ QPointF(tick.first, ruler_height));
+ }
- division++;
- } while (x < width());
+ for (const auto& tick: tick_position_cache_->minor) {
+ p.drawLine(QPointF(tick, minor_tick_y1),
+ QPointF(tick, ruler_height));
+ }
// Draw the hover mark
draw_hover_mark(p, text_height);
}
}
+Ruler::TickPositions Ruler::calculate_tick_positions(
+ const double major_period,
+ const pv::util::Timestamp& offset,
+ const double scale,
+ const int width,
+ std::function<QString(const pv::util::Timestamp&)> format_function)
+{
+ TickPositions tp;
+
+ const double minor_period = major_period / MinorTickSubdivision;
+ const pv::util::Timestamp first_major_division = floor(offset / major_period);
+ const pv::util::Timestamp first_minor_division = ceil(offset / minor_period);
+ const pv::util::Timestamp t0 = first_major_division * major_period;
+
+ int division = (round(first_minor_division -
+ first_major_division * MinorTickSubdivision)).convert_to<int>() - 1;
+
+ double x;
+
+ do {
+ const pv::util::Timestamp t = t0 + division * minor_period;
+ x = ((t - offset) / scale).convert_to<double>();
+
+ if (division % MinorTickSubdivision == 0) {
+ tp.major.emplace_back(x, format_function(t));
+ } else {
+ tp.minor.emplace_back(x);
+ }
+
+ division++;
+ } while (x < width);
+
+ return tp;
+}
+
void Ruler::mouseDoubleClickEvent(QMouseEvent *e)
{
view_.add_flag(view_.offset() + ((double)e->x() + 0.5) * view_.scale());
update();
}
+void Ruler::invalidate_tick_position_cache()
+{
+ tick_position_cache_ = boost::none;
+}
+
+void Ruler::resizeEvent(QResizeEvent*)
+{
+ // the tick calculation depends on the width of this widget
+ invalidate_tick_position_cache();
+}
+
} // namespace view
} // namespace pv