mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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296 lines
8.6 KiB
C
296 lines
8.6 KiB
C
/* Path/Fill and Stroke
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*
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* This demo shows how to use GskPath to draw shapes that are (a bit)
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* more complex than a rounded rectangle.
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*
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* It also demonstrates printing to a stream with GtkPrintDialog.
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*/
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#include <glib/gi18n.h>
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#include <gtk/gtk.h>
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#include <cairo-pdf.h>
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#include "paintable.h"
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#define GTK_TYPE_LOGO_PAINTABLE (gtk_logo_paintable_get_type ())
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G_DECLARE_FINAL_TYPE (GtkLogoPaintable, gtk_logo_paintable, GTK, LOGO_PAINTABLE, GObject)
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struct _GtkLogoPaintable
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{
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GObject parent_instance;
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int width;
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int height;
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GskPath *path[3];
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GdkRGBA color[3];
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GskPath *stroke_path;
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GskStroke *stroke1;
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GskStroke *stroke2;
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GdkRGBA stroke_color;
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};
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struct _GtkLogoPaintableClass
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{
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GObjectClass parent_class;
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};
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static int
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gtk_logo_paintable_get_intrinsic_width (GdkPaintable *paintable)
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{
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GtkLogoPaintable *self = GTK_LOGO_PAINTABLE (paintable);
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return self->width;
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}
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static int
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gtk_logo_paintable_get_intrinsic_height (GdkPaintable *paintable)
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{
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GtkLogoPaintable *self = GTK_LOGO_PAINTABLE (paintable);
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return self->height;
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}
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static void
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gtk_logo_paintable_snapshot (GdkPaintable *paintable,
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GdkSnapshot *snapshot,
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double width,
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double height)
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{
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GtkLogoPaintable *self = GTK_LOGO_PAINTABLE (paintable);
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for (unsigned int i = 0; i < 3; i++)
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{
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gtk_snapshot_push_fill (snapshot, self->path[i], GSK_FILL_RULE_WINDING);
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gtk_snapshot_append_color (snapshot,
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&self->color[i],
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&GRAPHENE_RECT_INIT (0, 0, width, height));
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gtk_snapshot_pop (snapshot);
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}
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for (unsigned int i = 0; i < 3; i++)
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{
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gtk_snapshot_push_stroke (snapshot, self->stroke_path, self->stroke1);
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gtk_snapshot_append_color (snapshot,
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&self->stroke_color,
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&GRAPHENE_RECT_INIT (0, 0, width, height));
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gtk_snapshot_pop (snapshot);
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}
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gtk_snapshot_push_stroke (snapshot, self->stroke_path, self->stroke2);
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gtk_snapshot_append_color (snapshot,
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&self->stroke_color,
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&GRAPHENE_RECT_INIT (0, 0, width, height));
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gtk_snapshot_pop (snapshot);
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}
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static GdkPaintableFlags
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gtk_logo_paintable_get_flags (GdkPaintable *paintable)
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{
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return GDK_PAINTABLE_STATIC_CONTENTS | GDK_PAINTABLE_STATIC_SIZE;
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}
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static void
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gtk_logo_paintable_paintable_init (GdkPaintableInterface *iface)
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{
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iface->get_intrinsic_width = gtk_logo_paintable_get_intrinsic_width;
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iface->get_intrinsic_height = gtk_logo_paintable_get_intrinsic_height;
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iface->snapshot = gtk_logo_paintable_snapshot;
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iface->get_flags = gtk_logo_paintable_get_flags;
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}
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/* When defining the GType, we need to implement the GdkPaintable interface */
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G_DEFINE_TYPE_WITH_CODE (GtkLogoPaintable, gtk_logo_paintable, G_TYPE_OBJECT,
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G_IMPLEMENT_INTERFACE (GDK_TYPE_PAINTABLE,
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gtk_logo_paintable_paintable_init))
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static void
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gtk_logo_paintable_dispose (GObject *object)
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{
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GtkLogoPaintable *self = GTK_LOGO_PAINTABLE (object);
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for (unsigned int i = 0; i < 3; i++)
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gsk_path_unref (self->path[i]);
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gsk_path_unref (self->stroke_path);
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gsk_stroke_free (self->stroke1);
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gsk_stroke_free (self->stroke2);
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G_OBJECT_CLASS (gtk_logo_paintable_parent_class)->dispose (object);
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}
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static void
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gtk_logo_paintable_class_init (GtkLogoPaintableClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->dispose = gtk_logo_paintable_dispose;
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}
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static void
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gtk_logo_paintable_init (GtkLogoPaintable *self)
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{
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}
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static GdkPaintable *
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gtk_logo_paintable_new (void)
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{
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GtkLogoPaintable *self;
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graphene_rect_t bounds, bounds2;
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self = g_object_new (GTK_TYPE_LOGO_PAINTABLE, NULL);
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/* Paths and colors extracted from gtk-logo.svg */
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self->path[0] = gsk_path_parse ("m3.12,66.17 -2.06,-51.46 32.93,24.7 v55.58 l-30.87,-28.82 z");
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self->path[1] = gsk_path_parse ("m34,95 49.4,-20.58 4.12,-51.46 -53.52,16.47 v55.58 z");
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self->path[2] = gsk_path_parse ("m1.06,14.71 32.93,24.7 53.52,-16.47 -36.75,-21.88 -49.7,13.65 z");
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gdk_rgba_parse (&self->color[0], "#e40000");
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gdk_rgba_parse (&self->color[1], "#7fe719");
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gdk_rgba_parse (&self->color[2], "#729fcf");
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self->stroke_path = gsk_path_parse ("m50.6,51.3 -47.3,14 z l33,23 z v-50");
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self->stroke1 = gsk_stroke_new (2.12);
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self->stroke2 = gsk_stroke_new (1.25);
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gdk_rgba_parse (&self->stroke_color, "#ffffff");
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gsk_path_get_stroke_bounds (self->path[0], self->stroke1, &bounds);
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gsk_path_get_stroke_bounds (self->path[1], self->stroke1, &bounds2);
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graphene_rect_union (&bounds, &bounds2, &bounds);
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gsk_path_get_stroke_bounds (self->path[2], self->stroke1, &bounds2);
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graphene_rect_union (&bounds, &bounds2, &bounds);
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gsk_path_get_stroke_bounds (self->stroke_path, self->stroke2, &bounds2);
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graphene_rect_union (&bounds, &bounds2, &bounds);
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self->width = bounds.origin.x + bounds.size.width;
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self->height = bounds.origin.y + bounds.size.height;
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return GDK_PAINTABLE (self);
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}
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static cairo_status_t
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write_cairo (void *closure,
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const unsigned char *data,
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unsigned int length)
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{
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GOutputStream *stream = closure;
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gsize written;
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GError *error = NULL;
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if (!g_output_stream_write_all (stream, data, length, &written, NULL, &error))
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{
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g_print ("Error writing pdf stream: %s\n", error->message);
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g_error_free (error);
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return CAIRO_STATUS_WRITE_ERROR;
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}
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return CAIRO_STATUS_SUCCESS;
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}
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static void
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print_ready (GObject *source,
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GAsyncResult *result,
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gpointer data)
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{
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GtkPrintDialog *dialog = GTK_PRINT_DIALOG (source);
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GError *error = NULL;
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GOutputStream *stream;
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GtkSnapshot *snapshot;
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GdkPaintable *paintable;
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GskRenderNode *node;
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cairo_surface_t *surface;
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cairo_t *cr;
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stream = gtk_print_dialog_print_finish (dialog, result, &error);
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if (stream == NULL)
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{
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g_print ("Failed to get output stream: %s\n", error->message);
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g_error_free (error);
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return;
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}
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snapshot = gtk_snapshot_new ();
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paintable = gtk_picture_get_paintable (GTK_PICTURE (data));
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gdk_paintable_snapshot (paintable, snapshot, 100, 100);
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node = gtk_snapshot_free_to_node (snapshot);
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surface = cairo_pdf_surface_create_for_stream (write_cairo, stream, 100, 100);
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cr = cairo_create (surface);
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gsk_render_node_draw (node, cr);
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cairo_destroy (cr);
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cairo_surface_destroy (surface);
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gsk_render_node_unref (node);
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if (!g_output_stream_close (stream, NULL, &error))
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{
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g_print ("Error from close: %s\n", error->message);
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g_error_free (error);
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}
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g_object_unref (stream);
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}
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static void
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print (GtkButton *button,
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gpointer data)
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{
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GtkWidget *picture = data;
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GtkPrintDialog *dialog;
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dialog = gtk_print_dialog_new ();
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gtk_print_dialog_print (dialog,
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GTK_WINDOW (gtk_widget_get_root (picture)),
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NULL,
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NULL,
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print_ready,
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picture);
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g_object_unref (dialog);
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}
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GtkWidget *
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do_path_fill (GtkWidget *do_widget)
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{
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static GtkWidget *window = NULL;
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if (!window)
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{
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GtkWidget *header, *button, *label;
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GtkWidget *picture;
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GdkPaintable *paintable;
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window = gtk_window_new ();
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gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
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gtk_window_set_default_size (GTK_WINDOW (window), 100, 100);
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gtk_window_set_title (GTK_WINDOW (window), "Fill and Stroke");
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header = gtk_header_bar_new ();
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button = gtk_button_new_from_icon_name ("printer-symbolic");
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gtk_header_bar_pack_start (GTK_HEADER_BAR (header), button);
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label = gtk_label_new ("Fill and Stroke");
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gtk_widget_add_css_class (label, "title");
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gtk_header_bar_set_title_widget (GTK_HEADER_BAR (header), label);
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gtk_window_set_titlebar (GTK_WINDOW (window), header);
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g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
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paintable = gtk_logo_paintable_new ();
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picture = gtk_picture_new_for_paintable (paintable);
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gtk_picture_set_content_fit (GTK_PICTURE (picture), GTK_CONTENT_FIT_CONTAIN);
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gtk_picture_set_can_shrink (GTK_PICTURE (picture), FALSE);
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g_object_unref (paintable);
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g_signal_connect (button, "clicked", G_CALLBACK (print), picture);
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gtk_window_set_child (GTK_WINDOW (window), picture);
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}
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if (!gtk_widget_get_visible (window))
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gtk_window_present (GTK_WINDOW (window));
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else
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gtk_window_destroy (GTK_WINDOW (window));
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return window;
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}
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