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example6.cpp
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example6.cpp
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// https://www.youtube.com/watch?v=PMZ9BFgane4&t=1175s&ab_channel=KevinO%27Kane
#include <QtMath>
#include <QApplication>
#include <QTime>
#include <QTimer>
#include "cairo/cairo.h"
#include "CairoWidget.hpp"
class ClockWidget final: public CairoWidget
{
double k_;
public:
explicit ClockWidget()
{
init([&](auto const cr, int const w, int const h) noexcept
{
cairo_set_antialias(cr, CAIRO_ANTIALIAS_BEST);
if (w >= h)
{
k_ = 1. / h;
cairo_translate(cr, .5 * (w - h), 0.);
cairo_scale(cr, h, h);
}
else
{
k_ = 1. / w;
cairo_translate(cr, 0., .5 * (h - w));
cairo_scale(cr, w, w);
}
cairo_translate(cr, .5, .5);
}
);
draw([&](auto const cr, auto, auto)
{
cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
cairo_paint(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
//
int h, m, s;
{
auto const ct(QTime::currentTime());
h = ct.hour() % 12;
m = ct.minute();
s = ct.second();
}
// hash marks
cairo_set_source_rgb(cr, .5, .5, 1.);
cairo_set_line_width(cr, k_ * 2.5);
for (int i{}; i != 60; i += 5)
{
double const X((i - 3) * M_PI / 6);
double x0, y0;
cairo_arc(cr, 0., 0., .5, -M_PI, X);
cairo_get_current_point(cr, &x0, &y0);
double x1, y1;
cairo_arc(cr, 0., 0., .5 - k_ * 10. , -M_PI, X);
cairo_get_current_point(cr, &x1, &y1);
cairo_new_path(cr);
cairo_move_to(cr, x0, y0);
cairo_line_to (cr, x1, y1);
cairo_stroke(cr);
}
// needles
auto const draw_needle(
[&](double const len, double const pos) noexcept
{
cairo_arc(cr, 0., 0., len, -M_PI, pos);
double x, y;
cairo_get_current_point(cr, &x, &y);
cairo_new_path(cr);
cairo_move_to(cr, 0., 0.);
cairo_line_to(cr, x, y);
cairo_stroke(cr);
}
);
cairo_set_source_rgb(cr, .5, 1., .5);
cairo_set_line_width(cr, k_ * 3.);
draw_needle(.3, (h - 3 + m / 60) * (M_PI / 6));
cairo_set_source_rgb(cr, 1., 0., 0.);
cairo_set_line_width(cr, k_ * 2.);
draw_needle(.45, (m - 15) * (M_PI / 30));
// second needle
cairo_set_source_rgb(cr, 1., 1., .3);
cairo_set_line_width(cr, k_ * 2.5);
{
double const pos((s - 15) * (M_PI / 30));
for (int i{}; i != 60; ++i)
{
if (double const X((i - 15) * (M_PI / 30)); X >= pos)
{
break;
}
else if (i % 5)
{
double x0, y0;
cairo_arc(cr, 0., 0., .5, -M_PI, X);
cairo_get_current_point(cr, &x0, &y0);
double x1, y1;
cairo_arc(cr, 0., 0., .5 - k_ * 3., -M_PI, X);
cairo_get_current_point(cr, &x1, &y1);
cairo_new_path(cr);
cairo_move_to(cr, x0, y0);
cairo_line_to(cr, x1, y1);
cairo_stroke(cr);
}
}
cairo_set_line_width(cr, k_ * 1.);
draw_needle(.5, pos);
}
// spindle
cairo_arc(cr, 0., 0., k_ * 4., -M_PI, M_PI);
cairo_fill(cr);
}
);
//
auto t(new QTimer(this));
connect(t, &QTimer::timeout, this, QOverload<>::of(&ClockWidget::update));
t->start(1000);
}
};
//////////////////////////////////////////////////////////////////////////////
int main(int argc, char* argv[])
{
QApplication app(argc, argv);
ClockWidget w;
w.resize(w.height(), w.height());
w.show();
return app.exec();
}