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。