drawing_area added.

vala/drawing_area/build.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+valac --pkg=gtk+-3.0 drawing_area.vala && ./drawing_area

vala/drawing_area/drawing_area.vala

@@ -0,0 +1,49 @@
+public class Application : Gtk.Window {
+	public Application () {
+		// Prepare Gtk.Window:
+		this.title = "My Gtk.DrawingArea";
+		this.window_position = Gtk.WindowPosition.CENTER;
+		this.destroy.connect (Gtk.main_quit);
+		this.set_default_size (400, 400);
+
+		// The drawing area:
+		Gtk.DrawingArea drawing_area = new Gtk.DrawingArea ();
+		drawing_area.draw.connect ((context) => {
+			// Get necessary data:
+			weak Gtk.StyleContext style_context = drawing_area.get_style_context ();
+			int height = drawing_area.get_allocated_height ();
+			int width = drawing_area.get_allocated_width ();
+			Gdk.RGBA color = style_context.get_color (0);
+
+			// Draw an arc:
+			double xc = width / 2.0;
+			double yc = height / 2.0;
+			double radius = int.min (width, height) / 2.0;
+			double angle1 = 0;
+			double angle2 = 2*Math.PI;
+
+			context.arc (xc, yc, radius, angle1, angle2);
+			Gdk.cairo_set_source_rgba (context, color);
+			context.fill ();
+
+			// Text:
+			context.set_source_rgb (0.1, 0.1, 0.1); 
+			context.select_font_face ("Adventure", Cairo.FontSlant.NORMAL, Cairo.FontWeight.BOLD);
+			context.set_font_size (20);
+			context.move_to (20, 30);
+			context.show_text ("Indiana Jones"); 
+
+			return true;
+		});
+		this.add (drawing_area);
+	}
+
+	public static int main (string[] args) {
+		Gtk.init (ref args);
+
+		Application app = new Application ();
+		app.show_all ();
+		Gtk.main ();
+		return 0;
+	}
+}