#include <assert.h>
#include <math.h>
+#include <limits.h>
#include <QMouseEvent>
#include <QPainter>
this, SLOT(hover_point_changed()));
}
-void Ruler::paintEvent(QPaintEvent *event)
+void Ruler::paintEvent(QPaintEvent*)
{
+ using namespace Qt;
+
+ const double SpacingIncrement = 32.0f;
+ const double MinValueSpacing = 32.0f;
+
QPainter p(this);
p.setRenderHint(QPainter::Antialiasing);
- const double MinSpacing = 80;
+ double min_width = SpacingIncrement, typical_width;
+ double tick_period;
+ unsigned int prefix;
+ double multiplier;
- const double min_period = _view.scale() * MinSpacing;
+ // Find tick spacing, and number formatting that does not cause
+ // value to collide.
+ do
+ {
+ const double min_period = _view.scale() * min_width;
- const int order = (int)floorf(log10f(min_period));
- const double order_decimal = pow(10, order);
+ const int order = (int)floorf(log10f(min_period));
+ const double order_decimal = pow(10, order);
- unsigned int unit = 0;
- double tick_period = 0.0f;
+ unsigned int unit = 0;
- do
- {
- tick_period = order_decimal * ScaleUnits[unit++];
- } while(tick_period < min_period && unit < countof(ScaleUnits));
+ do
+ {
+ tick_period = order_decimal * ScaleUnits[unit++];
+ } while (tick_period < min_period && unit < countof(ScaleUnits));
- const unsigned int prefix = (order - FirstSIPrefixPower) / 3;
- assert(prefix >= 0);
- assert(prefix < countof(SIPrefixes));
+ prefix = (order - FirstSIPrefixPower) / 3;
+ assert(prefix < countof(SIPrefixes));
- const double multiplier = pow(10.0, - prefix * 3 - FirstSIPrefixPower);
+ multiplier = pow(10.0, - prefix * 3 - FirstSIPrefixPower);
+
+ typical_width = p.boundingRect(0, 0, INT_MAX, INT_MAX,
+ AlignLeft | AlignTop, format_time(_view.offset(),
+ multiplier, prefix)).width() + MinValueSpacing;
+
+ min_width += SpacingIncrement;
+
+ } while(typical_width > tick_period / _view.scale());
const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX,
- Qt::AlignLeft | Qt::AlignTop, "8").height();
+ AlignLeft | AlignTop, "8").height();
// Draw the tick marks
- p.setPen(Qt::black);
+ p.setPen(palette().color(foregroundRole()));
const double minor_tick_period = tick_period / MinorTickSubdivision;
const double first_major_division =
int division = (int)round(first_minor_division -
first_major_division * MinorTickSubdivision);
- while(1)
+ while (1)
{
const double t = t0 + division * minor_tick_period;
const double x = (t - _view.offset()) / _view.scale();
- if(x >= width())
+ if (x >= width())
break;
- if(division % MinorTickSubdivision == 0)
+ if (division % MinorTickSubdivision == 0)
{
// Draw a major tick
- QString s;
- QTextStream ts(&s);
- ts << (t * multiplier) << SIPrefixes[prefix] << "s";
- p.drawText(x, 0, 0, text_height, Qt::AlignCenter |
- Qt::AlignTop | Qt::TextDontClip, s);
+ p.drawText(x, 0, 0, text_height, AlignCenter |
+ AlignTop | TextDontClip,
+ format_time(t, multiplier, prefix));
p.drawLine(QPointF(x, text_height),
QPointF(x, height()));
}
void Ruler::mouseMoveEvent(QMouseEvent *e)
{
- if(!_grabbed_marker)
+ if (!_grabbed_marker)
return;
_grabbed_marker->set_time(_view.offset() +
void Ruler::mousePressEvent(QMouseEvent *e)
{
- if(e->buttons() & Qt::LeftButton) {
+ if (e->buttons() & Qt::LeftButton) {
_grabbed_marker = NULL;
- if(_view.cursors_shown()) {
+ if (_view.cursors_shown()) {
std::pair<Cursor, Cursor> &cursors =
_view.cursors();
- if(cursors.first.get_label_rect(
+ if (cursors.first.get_label_rect(
rect()).contains(e->pos()))
_grabbed_marker = &cursors.first;
- else if(cursors.second.get_label_rect(
+ else if (cursors.second.get_label_rect(
rect()).contains(e->pos()))
_grabbed_marker = &cursors.second;
}
_grabbed_marker = NULL;
}
+QString Ruler::format_time(double t, double multiplier,
+ unsigned int prefix)
+{
+ QString s;
+ QTextStream ts(&s);
+ ts.setRealNumberPrecision(0);
+ ts << fixed << forcesign << (t * multiplier) <<
+ SIPrefixes[prefix] << "s";
+ return s;
+}
+
void Ruler::draw_cursors(QPainter &p)
{
- if(!_view.cursors_shown())
+ if (!_view.cursors_shown())
return;
const QRect r = rect();
void Ruler::draw_hover_mark(QPainter &p)
{
const int x = _view.hover_point().x();
- if(x == -1 || _grabbed_marker)
+
+ if (x == -1 || _grabbed_marker)
return;
p.setPen(QPen(Qt::NoPen));