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testgtk: Draw rotated text example with pangocairo

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This commit is contained in:
Benjamin Otte
2010-07-22 01:51:59 +02:00
parent 8630657324
commit e8bf80ebea
1 changed files with 22 additions and 51 deletions
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71
tests/testgtk.c
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@ -2747,58 +2747,30 @@ on_rotated_text_expose (GtkWidget *widget,
{
static const gchar *words[] = { "The", "grand", "old", "Duke", "of", "York",
"had", "10,000", "men" };
PangoRenderer *renderer;
GdkGC *gc;
int n_words;
int i;
double radius;
PangoMatrix matrix = PANGO_MATRIX_INIT;
PangoLayout *layout;
PangoContext *context;
PangoFontDescription *desc;
cairo_t *cr;
gc = g_object_get_data (G_OBJECT (widget), "text-gc");
if (!gc)
cr = gdk_cairo_create (event->window);
if (tile_pixbuf)
{
static GdkColor black = { 0, 0, 0, 0 };
gc = gdk_gc_new (widget->window);
gdk_gc_set_rgb_fg_color (gc, &black);
if (tile_pixbuf)
{
GdkPixmap *tile;
cairo_t *cr;
gint width = gdk_pixbuf_get_width (tile_pixbuf);
gint height = gdk_pixbuf_get_height (tile_pixbuf);
tile = gdk_pixmap_new (widget->window, width, height, -1);
cr = gdk_cairo_create (tile);
gdk_cairo_set_source_pixbuf (cr, tile_pixbuf, 0, 0);
cairo_paint (cr);
cairo_destroy (cr);
gdk_gc_set_tile (gc, tile);
gdk_gc_set_fill (gc, GDK_TILED);
g_object_unref (tile);
}
g_object_set_data_full (G_OBJECT (widget), "text-gc", gc, (GDestroyNotify)g_object_unref);
gdk_cairo_set_source_pixbuf (cr, tile_pixbuf, 0, 0);
cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_REPEAT);
}
renderer = gdk_pango_renderer_get_default (gtk_widget_get_screen (widget));
gdk_pango_renderer_set_drawable (GDK_PANGO_RENDERER (renderer), widget->window);
gdk_pango_renderer_set_gc (GDK_PANGO_RENDERER (renderer), gc);
else
cairo_set_source_rgb (cr, 0, 0, 0);
radius = MIN (widget->allocation.width, widget->allocation.height) / 2.;
pango_matrix_translate (&matrix,
radius + (widget->allocation.width - 2 * radius) / 2,
radius + (widget->allocation.height - 2 * radius) / 2);
pango_matrix_scale (&matrix, radius / DEFAULT_TEXT_RADIUS, radius / DEFAULT_TEXT_RADIUS);
cairo_translate (cr,
radius + (widget->allocation.width - 2 * radius) / 2,
radius + (widget->allocation.height - 2 * radius) / 2);
cairo_scale (cr, radius / DEFAULT_TEXT_RADIUS, radius / DEFAULT_TEXT_RADIUS);
context = gtk_widget_get_pango_context (widget);
layout = pango_layout_new (context);
@ -2809,25 +2781,24 @@ on_rotated_text_expose (GtkWidget *widget,
n_words = G_N_ELEMENTS (words);
for (i = 0; i < n_words; i++)
{
PangoMatrix rotated_matrix = matrix;
int width, height;
pango_matrix_rotate (&rotated_matrix, - (360. * i) / n_words);
cairo_save (cr);
cairo_rotate (cr, 2 * G_PI * i / n_words);
pango_cairo_update_layout (cr, layout);
pango_context_set_matrix (context, &rotated_matrix);
pango_layout_context_changed (layout);
pango_layout_set_text (layout, words[i], -1);
pango_layout_get_size (layout, &width, &height);
pango_renderer_draw_layout (renderer, layout,
- width / 2, - DEFAULT_TEXT_RADIUS * PANGO_SCALE);
cairo_move_to (cr, - width / 2 / PANGO_SCALE, - DEFAULT_TEXT_RADIUS);
pango_cairo_show_layout (cr, layout);
cairo_restore (cr);
}
gdk_pango_renderer_set_drawable (GDK_PANGO_RENDERER (renderer), NULL);
gdk_pango_renderer_set_gc (GDK_PANGO_RENDERER (renderer), NULL);
g_object_unref (layout);
cairo_destroy (cr);
return FALSE;
}