/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
/*
 * cairo_test.c
 */

#include <gtk/gtk.h>
#include <glib.h>
#include <cairo.h>
#include <pango/pango.h>

#include <stdio.h>
#include <locale.h>

#define UI_STRING "<?xml version=\"1.0\" encoding=\"UTF-8\"?> \
<interface> \
  <!-- interface-requires gtk+ 3.0 --> \
  <object class=\"GtkWindow\" id=\"window\"> \
    <property name=\"can_focus\">False</property> \
    <property name=\"window_position\">center</property> \
    <property name=\"default_width\">450</property> \
    <property name=\"default_height\">450</property> \
    <signal name=\"destroy\" handler=\"on_window_destroy\" swapped=\"no\"/> \
    <child> \
      <object class=\"GtkBox\" id=\"box1\"> \
        <property name=\"visible\">True</property> \
        <property name=\"can_focus\">False</property> \
        <property name=\"orientation\">vertical</property> \
        <property name=\"spacing\">5</property> \
        <child> \
          <placeholder/> \
        </child> \
        <child> \
          <object class=\"GtkDrawingArea\" id=\"daCairo\"> \
            <property name=\"visible\">True</property> \
            <property name=\"app_paintable\">True</property> \
            <property name=\"can_focus\">False</property> \
            <signal name=\"draw\" handler=\"on_daCairo_draw\" swapped=\"no\"/> \
          </object> \
          <packing> \
            <property name=\"expand\">True</property> \
            <property name=\"fill\">True</property> \
            <property name=\"position\">1</property> \
          </packing> \
        </child> \
        <child> \
          <object class=\"GtkButtonBox\" id=\"buttonbox1\"> \
            <property name=\"visible\">True</property> \
            <property name=\"can_focus\">False</property> \
            <property name=\"spacing\">5</property> \
            <property name=\"layout_style\">start</property> \
            <child> \
              <object class=\"GtkButton\" id=\"btnDraw\"> \
                <property name=\"label\" translatable=\"yes\">Draw</property> \
                <property name=\"visible\">True</property> \
                <property name=\"can_focus\">True</property> \
                <property name=\"receives_default\">True</property> \
                <signal name=\"clicked\" handler=\"on_btnDraw_clicked\" swapped=\"no\"/> \
              </object> \
              <packing> \
                <property name=\"expand\">False</property> \
                <property name=\"fill\">True</property> \
                <property name=\"position\">0</property> \
              </packing> \
            </child> \
            <child> \
              <placeholder/> \
            </child> \
            <child> \
              <placeholder/> \
            </child> \
          </object> \
          <packing> \
            <property name=\"expand\">False</property> \
            <property name=\"fill\">True</property> \
            <property name=\"position\">2</property> \
          </packing> \
        </child> \
      </object> \
    </child> \
  </object> \
</interface>"

/*
 * Da builder - variabile globale
 */
GtkBuilder *builder;
float thick = 1.0;

/* Called when the window is closed
 */
G_MODULE_EXPORT void on_window_destroy(GtkWidget *self, gpointer data)
{
	gtk_main_quit();
}

void draw_me(GtkWidget *self, cairo_t *cr)
{
	GdkRGBA rosa, bianco, nero, rosso;
	gint width, height;
	gdouble dash[] = {10.0, 10.0};

	rosa.red = 1;
	rosa.green = 0.2;
	rosa.blue = 0.2;
	rosa.alpha = 0.6;

	rosso.red = 1;
	rosso.green = 0;
	rosso.blue = 0;
	rosso.alpha = 0.6;

	bianco.red = 1;
	bianco.green = 1;
	bianco.blue = 1;
	bianco.alpha = 1;

	nero.red = 0;
	nero.green = 0;
	nero.blue = 0;
	nero.alpha = 1;

	//cairo_set_source_rgba(cr, 1, 0.2, 0.2, 0.6);

	gdk_cairo_set_source_rgba(cr, &rosa);
	cairo_set_line_width(cr, thick);
	cairo_set_dash(cr, dash, 2, 0);

	gdk_window_set_background_rgba(gtk_widget_get_window(self), &bianco);

	cairo_move_to(cr, 128.0, 25.6);
	cairo_line_to(cr, 230.4, 230.4);
	cairo_stroke(cr);

	gdk_cairo_set_source_rgba(cr, &rosso);
	cairo_set_dash(cr, dash, 0, 0);
	cairo_move_to(cr, 230.4, 230.4);
	cairo_rel_line_to(cr, -102.4, 0.0);
	cairo_rel_line_to(cr, 100, 100);
	cairo_stroke(cr);

	gdk_cairo_set_source_rgba(cr, &nero);
	cairo_move_to(cr, 250, 250);
	cairo_set_font_size(cr, 16.0);
    cairo_show_text(cr, "A ciccio");

    gdk_window_get_geometry(gtk_widget_get_window(self), NULL, NULL, &width, &height);
    cairo_rectangle(cr, 0, 0, width, height);
	cairo_stroke(cr);
}


/** @fn on_btnQuit_clicked(GtkButton *, gpointer)
 *	Callback collegata al pulsante "Quit".
 */
G_MODULE_EXPORT void on_btnDraw_clicked(GtkButton *self, gpointer data)
{
	GtkWidget *da;
	cairo_rectangle_int_t rec;

	g_print("drawing...\n");

	if (thick < 10.0)
	{
		thick *= 1.5;
	}
	else
	{
		thick = 1.0;
	}

	da = GTK_WIDGET(gtk_builder_get_object(builder, "window"));

	rec.x = 0;
	rec.y = 0;
	gdk_window_get_geometry(gtk_widget_get_window(da), NULL, NULL, &(rec.width), &(rec.height));
	gdk_window_invalidate_rect(gtk_widget_get_window(da), &rec, TRUE);
}

G_MODULE_EXPORT gboolean on_daCairo_draw(GtkWidget *self, cairo_t *cr, gpointer data)
{
	g_print("draw+");

	/* all drawing actions are performed by this function
	 */
	draw_me(self, cr);

	return FALSE;
}

static GtkWidget *create_window(void)
{
	GtkWidget *window;
	GError    *error = NULL;

	/*
	 * Load UI from file
	 */
	builder = gtk_builder_new();
	//if (!gtk_builder_add_from_file(builder, "./cairo_test.ui", &error))
	if (!gtk_builder_add_from_string(builder, UI_STRING, -1, &error))
	{
		g_critical("Couldn't load builder file: %s", error->message);
		g_error_free(error);
	}

	/*
	 * Get the window object from the ui file
	 */
	window = GTK_WIDGET(gtk_builder_get_object(builder, "window"));
	if (!window)
	{
		g_critical("Widget \"%s\" is missing in file %s.",
		           "window",
		           "./cairo_test.ui");
	}

	/*
	 * Auto-connect signal handlers
	 */
	gtk_builder_connect_signals(builder, window);

	return window;
}

int main(int argc, char *argv[])
{
 	GtkWidget *window;

	/*
	 * Prima di invocare il main loop, imposto il locale
	 * di default ("C", per leggere i float con il punto)
	 */
	setlocale(/*LC_NUMERIC*/1, "C");
	gtk_disable_setlocale();

	gtk_init(&argc, &argv);

	window = create_window();
	gtk_widget_show(window);

	gtk_main();

	g_object_unref(builder);

	return 0;
}