compile command
valac --pkg gtk+-3.0 genie-gtk-drawing-area.gs
./genie-gtk-drawing-areathis is equivalent to https://valadoc.org/gtk+-3.0/Gtk.DrawingArea.html but these sample coludn't be got with genie
signal += sample is this gist rev:7fdda28e8| /** compile command | |
| * | |
| * ```bash | |
| * valac --pkg gtk+-3.0 genie-gtk-drawing-area.gs | |
| * ./genie-gtk-drawing-area | |
| * ``` | |
| * | |
| * this is equivalent to https://valadoc.org/gtk+-3.0/Gtk.DrawingArea.html | |
| * but these sample coludn't be got with genie | |
| * | |
| * - Genie do not have [anonymous method now]( | |
| * https://bugzilla.gnome.org/show_bug.cgi?id=746704) | |
| * - Deprecated `signal +=` sample is [this gist rev:7fdda28e8]( | |
| * https://gist.github.com/kuri65536/844b89c1825f2c581d4333d5c8b2a3dd/7fdda28e8bff4df326e2f104ad6ee34aa6cb092b) | |
| */ | |
| [indent=4] | |
| init | |
| Gtk.init (ref args) // Initialise the Gtk library | |
| var AppWindow = new MainAppWindow() //make an instance of the window | |
| AppWindow.show_all() | |
| Gtk.main() // pass control to the GTK main loop which polls for signals/events | |
| class MainAppWindow : Gtk.Window | |
| drawing_area: Gtk.DrawingArea | |
| init | |
| title = "My Gtk.DrawingArea" | |
| window_position = Gtk.WindowPosition.CENTER | |
| destroy.connect(Gtk.main_quit) // add the Gtk.main_quit to the close | |
| default_height = 400 // set the height of the window | |
| default_width = 400 // set the width of the window | |
| self.drawing_area = new Gtk.DrawingArea() | |
| self.drawing_area.draw.connect(self.on_draw) | |
| self.add(self.drawing_area) | |
| def on_draw(context: Cairo.Context): bool | |
| // Get necessary data: | |
| style_context: weak Gtk.StyleContext | |
| style_context = drawing_area.get_style_context () | |
| var height = drawing_area.get_allocated_height() | |
| var width = drawing_area.get_allocated_width() | |
| var color = style_context.get_color(0) | |
| // Draw an arc: | |
| var xc = width / 2.0 | |
| var yc = height / 2.0 | |
| var radius = int.min (width, height) / 2.0 | |
| var angle1 = 0 | |
| var angle2 = 2 * Math.PI | |
| context.arc(xc, yc, radius, angle1, angle2) | |
| Gdk.cairo_set_source_rgba (context, color) | |
| context.fill() | |
| return true |