dpi bulucu

main.vala

// valac --pkg gtk+-3.0 main.vala -o main
int main(string[] args){
    double constant_screen = 50.95481424;
    Gtk.init(ref args);
    var display = Gdk.Display.get_default();
    for (var i = 0; i < display.get_n_monitors (); i++){
        var monitor = display.get_monitor(i);
        var width_milimeter = monitor.get_width_mm();
        var height_milimeter = monitor.get_height_mm();
        var width_pixel =  monitor.get_geometry().width;
        var height_pixel = monitor.get_geometry().height;
        var wdpi = (float)width_milimeter/(float)width_pixel;
        var hdpi = (float)height_milimeter/(float)height_pixel;
        var dpi_recommend = (constant_screen/(wdpi+hdpi));
        stdout.printf("%s %s => psize:%d:%d size:%d:%d dpi:%.2f:%s%.2f\n".printf(
            monitor.get_manufacturer(),
            monitor.get_model(),
            width_milimeter, height_milimeter,
            width_pixel,height_pixel,
            dpi_recommend, "%", dpi_recommend*100/96
        ));
    }
    return 0;
}