raspberry pi 1でgtkmm その3

概要

raspberry pi 1でgtkmmやってみた。
時計やってみた。

写真

サンプルコード

#include <gtkmm/drawingarea.h>
#include <ctime>
#include <cmath>
#include <cairomm/context.h>
#include <glibmm/main.h>
#include <gtkmm/application.h>
#include <gtkmm/window.h>

class Clock: public Gtk::DrawingArea
{
public:
    Clock();
    virtual ~Clock();
protected:
    bool on_draw(const Cairo::RefPtr<Cairo::Context>& cr) override;
    bool on_timeout();
    double m_radius;
    double m_line_width;
};
Clock::Clock(): m_radius(0.42), m_line_width(0.05)
{
    Glib::signal_timeout().connect( sigc::mem_fun(* this, &Clock::on_timeout), 1000);
}
Clock::~Clock()
{
}
bool Clock::on_draw(const Cairo::RefPtr<Cairo::Context>& cr)
{
    Gtk::Allocation allocation = get_allocation();
    const int width = allocation.get_width();
    const int height = allocation.get_height();
    cr->scale(width, height);
    cr->translate(0.5, 0.5);
    cr->set_line_width(m_line_width);
    cr->save();
    cr->set_source_rgba(0.337, 0.612, 0.117, 0.9);
    cr->paint();
    cr->restore();
    cr->arc(0, 0, m_radius, 0, 2 * M_PI);
    cr->save();
    cr->set_source_rgba(1.0, 1.0, 1.0, 0.8);
    cr->fill_preserve();
    cr->restore();
    cr->stroke_preserve();
    cr->clip();
    for (int i = 0; i < 12; i++)
    {
        double inset = 0.05;
        cr->save();
        cr->set_line_cap(Cairo::LINE_CAP_ROUND);
        if (i % 3 != 0)
        {
            inset *= 0.8;
            cr->set_line_width(0.03);
        }
        cr->move_to((m_radius - inset) * cos (i * M_PI / 6), (m_radius - inset) * sin (i * M_PI / 6));
        cr->line_to (m_radius * cos (i * M_PI / 6), m_radius * sin (i * M_PI / 6));
        cr->stroke();
        cr->restore();
    }
    time_t rawtime;
    time(&rawtime);
    struct tm * timeinfo = localtime(&rawtime);
    double minutes = timeinfo->tm_min * M_PI / 30;
    double hours = timeinfo->tm_hour * M_PI / 6;
    double seconds= timeinfo->tm_sec * M_PI / 30;
    cr->save();
    cr->set_line_cap(Cairo::LINE_CAP_ROUND);
    cr->save();
    cr->set_line_width(m_line_width / 3);
    cr->set_source_rgba(0.7, 0.7, 0.7, 0.8);
    cr->move_to(0, 0);
    cr->line_to(sin(seconds) * (m_radius * 0.9), -cos(seconds) * (m_radius * 0.9));
    cr->stroke();
    cr->restore();
    cr->set_source_rgba(0.117, 0.337, 0.612, 0.9);
    cr->move_to(0, 0);
    cr->line_to(sin(minutes + seconds / 60) * (m_radius * 0.8), -cos(minutes + seconds / 60) * (m_radius * 0.8));
    cr->stroke();
    cr->set_source_rgba(0.337, 0.612, 0.117, 0.9);
    cr->move_to(0, 0);
    cr->line_to(sin(hours + minutes / 12.0) * (m_radius * 0.5), -cos(hours + minutes / 12.0) * (m_radius * 0.5));
    cr->stroke();
    cr->restore();
    cr->arc(0, 0, m_line_width / 3.0, 0, 2 * M_PI);
    cr->fill();
    return true;
}
bool Clock::on_timeout()
{
    auto win = get_window();
    if (win)
    {
        Gdk::Rectangle r(0, 0, get_allocation().get_width(), get_allocation().get_height());
        win->invalidate_rect(r, false);
    }
    return true;
}
int main(int argc, char ** argv)
{
     auto app = Gtk::Application::create(argc, argv, "org.gtkmm.example");
     Gtk::Window win;
     win.set_title("Cairomm Clock");
     Clock c;
     win.add(c);
     c.show();
     return app->run(win);
}

以上。