2015-06-29 05:46:53 +00:00
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/* Pango/Text Mask
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2015-06-29 05:43:27 +00:00
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*
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* This demo shows how to use PangoCairo to draw text with more than
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* just a single color.
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*/
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#include <glib/gi18n.h>
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#include <gtk/gtk.h>
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static gboolean
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draw_text (GtkWidget *da,
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cairo_t *cr,
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gpointer data)
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{
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cairo_pattern_t *pattern;
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PangoLayout *layout;
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PangoFontDescription *desc;
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cairo_save (cr);
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layout = gtk_widget_create_pango_layout (da, "Pango power!\nPango power!\nPango power!");
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desc = pango_font_description_from_string ("sans bold 34");
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pango_layout_set_font_description (layout, desc);
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pango_font_description_free (desc);
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cairo_move_to (cr, 30, 20);
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pango_cairo_layout_path (cr, layout);
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g_object_unref (layout);
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pattern = cairo_pattern_create_linear (0.0, 0.0,
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gtk_widget_get_allocated_width (da),
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gtk_widget_get_allocated_height (da));
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cairo_pattern_add_color_stop_rgb (pattern, 0.0, 1.0, 0.0, 0.0);
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cairo_pattern_add_color_stop_rgb (pattern, 0.2, 1.0, 0.0, 0.0);
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cairo_pattern_add_color_stop_rgb (pattern, 0.3, 1.0, 1.0, 0.0);
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cairo_pattern_add_color_stop_rgb (pattern, 0.4, 0.0, 1.0, 0.0);
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cairo_pattern_add_color_stop_rgb (pattern, 0.6, 0.0, 1.0, 1.0);
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cairo_pattern_add_color_stop_rgb (pattern, 0.7, 0.0, 0.0, 1.0);
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cairo_pattern_add_color_stop_rgb (pattern, 0.8, 1.0, 0.0, 1.0);
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cairo_pattern_add_color_stop_rgb (pattern, 1.0, 1.0, 0.0, 1.0);
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cairo_set_source (cr, pattern);
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cairo_fill_preserve (cr);
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cairo_pattern_destroy (pattern);
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cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
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cairo_set_line_width (cr, 0.5);
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cairo_stroke (cr);
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cairo_restore (cr);
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return TRUE;
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}
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GtkWidget *
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do_textmask (GtkWidget *do_widget)
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{
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static GtkWidget *window = NULL;
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static GtkWidget *da;
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if (!window)
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{
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_window_set_resizable (GTK_WINDOW (window), TRUE);
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gtk_widget_set_size_request (window, 400, 200);
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gtk_window_set_title (GTK_WINDOW (window), "Text Mask");
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g_signal_connect (window, "destroy",
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G_CALLBACK (gtk_widget_destroyed), &window);
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da = gtk_drawing_area_new ();
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gtk_container_add (GTK_CONTAINER (window), da);
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g_signal_connect (da, "draw",
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G_CALLBACK (draw_text), NULL);
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}
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if (!gtk_widget_get_visible (window))
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gtk_widget_show_all (window);
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else
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gtk_widget_destroy (window);
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return window;
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}
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