/* Cairo Vala Sample Code */
using Cairo;
using Gtk;

public class CairoSample : Window {
        const int SIZE = 30;
        [Widget] DrawingArea drawingarea;

        construct {
                title = "Cairo Vala Demo";
                destroy += Gtk.main_quit;
                set_default_size (450, 550);

                create_widgets ();
        }

        public void create_widgets () {
                drawingarea = new DrawingArea ();
                drawingarea.expose_event += expose;

                add (drawingarea);
        }

        private bool expose (DrawingArea da, Gdk.Event event) {
            Context ctx = Gdk.cairo_create (da.window);

            ctx.set_source_rgb (0, 0, 0);

            ctx.set_line_width (SIZE / 4);
            ctx.set_tolerance (0.1);

            ctx.set_line_join (LineJoin.ROUND);
            ctx.set_dash (new double[] {SIZE / 4.0, SIZE / 4.0}, 2, 0);
            stroke_shapes (ctx, 0, 0);

            ctx.set_dash (null, 0, 0);
            stroke_shapes (ctx, 0, 3 * SIZE);

            ctx.set_line_join (LineJoin.BEVEL);
            stroke_shapes (ctx, 0, 6 * SIZE);

            ctx.set_line_join (LineJoin.MITER);
            stroke_shapes(ctx, 0, 9 * SIZE);

            fill_shapes (ctx, 0, 12 * SIZE);

            ctx.set_line_join (LineJoin.BEVEL);
            fill_shapes (ctx, 0, 15 * SIZE);
            ctx.set_source_rgb (1, 0, 0);
            stroke_shapes (ctx, 0, 15 * SIZE);
        }

        public void stroke_shapes (Context ctx, int x, int y) {
            draw_shapes (ctx, x, y, false);
        }

        public void fill_shapes (Context ctx, int x, int y) {
            draw_shapes (ctx, x, y, true);
        }

        public void draw_shapes (Context ctx, int x, int y, bool fill) {
            ctx.save ();

            ctx.new_path ();
            ctx.translate (x+SIZE, y+SIZE);
            bowtie (ctx);
            if (fill)
                ctx.fill ();
            else
                ctx.stroke ();

            ctx.new_path ();
            ctx.translate (3 * SIZE, 0);
            square (ctx);
            if (fill)
                ctx.fill ();
            else
                ctx.stroke ();

            ctx.new_path ();
            ctx.translate (3 * SIZE, 0);
            triangle (ctx);
            if (fill)
                ctx.fill ();
            else
                ctx.stroke ();

            ctx.new_path ();
            ctx.translate (3 * SIZE, 0);
            inf (ctx);
            if (fill)
                ctx.fill ();
            else
                ctx.stroke ();

            ctx.restore();
        }

        public void triangle (Context ctx) {
            ctx.move_to (SIZE, 0);
            ctx.rel_line_to (SIZE, 2 * SIZE);
            ctx.rel_line_to (-2 * SIZE, 0);
            ctx.close_path ();
        }

        public void square (Context ctx) {
            ctx.move_to (0, 0);
            ctx.rel_line_to (2 * SIZE, 0);
            ctx.rel_line_to (0, 2 * SIZE);
            ctx.rel_line_to (-2 * SIZE, 0);
            ctx.close_path ();
        }

        public void bowtie (Context ctx) {
            ctx.move_to (0, 0);
            ctx.rel_line_to (2 * SIZE, 2 * SIZE);
            ctx.rel_line_to (-2 * SIZE, 0);
            ctx.rel_line_to (2 * SIZE, -2 * SIZE);
            ctx.close_path ();
        }

        public void inf (Context ctx) {
            ctx.move_to (0, SIZE);
            ctx.rel_curve_to (0, SIZE, SIZE, SIZE, 2 * SIZE, 0);
            ctx.rel_curve_to (SIZE, -SIZE, 2 * SIZE, -SIZE, 2 * SIZE, 0);
            ctx.rel_curve_to (0, SIZE, -SIZE, SIZE, -2 * SIZE, 0);
            ctx.rel_curve_to (-SIZE, -SIZE, -2 * SIZE, -SIZE, -2 * SIZE, 0);
            ctx.close_path ();
        }

        static int main (string[] args) {
                Gtk.init (out args);

                var cairosample = new CairoSample ();
                cairosample.show_all ();

                Gtk.main ();
                return 0;
        }
}