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gtk3-demo: Add a fancy text demo

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This demonstrates rendering text with a pattern instead of a
single color.
This commit is contained in:
Matthias Clasen 2015-06-28 22:43:27 -07:00
parent 876a6b550b
commit f97786f5e9
3 changed files with 87 additions and 0 deletions
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1
demos/gtk-demo/Makefile.am
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@ -56,6 +56,7 @@ demos_base = \
spinbutton.c \
spinner.c \
stack.c \
textmask.c \
textview.c \
textscroll.c \
theming_style_classes.c \

1
demos/gtk-demo/demo.gresource.xml
View File

@ -169,6 +169,7 @@
<file>toolpalette.c</file>
<file>transparent.c</file>
<file>tree_store.c</file>
<file>textmask.c</file>
</gresource>
<gresource prefix="/textview">
<file>floppybuddy.gif</file>

85
demos/gtk-demo/textmask.c Normal file
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@ -0,0 +1,85 @@
/* Text Mask
*
* This demo shows how to use PangoCairo to draw text with more than
* just a single color.
*/
#include <glib/gi18n.h>
#include <gtk/gtk.h>
static gboolean
draw_text (GtkWidget *da,
cairo_t *cr,
gpointer data)
{
cairo_pattern_t *pattern;
PangoLayout *layout;
PangoFontDescription *desc;
cairo_save (cr);
layout = gtk_widget_create_pango_layout (da, "Pango power!\nPango power!\nPango power!");
desc = pango_font_description_from_string ("sans bold 34");
pango_layout_set_font_description (layout, desc);
pango_font_description_free (desc);
cairo_move_to (cr, 30, 20);
pango_cairo_layout_path (cr, layout);
g_object_unref (layout);
pattern = cairo_pattern_create_linear (0.0, 0.0,
gtk_widget_get_allocated_width (da),
gtk_widget_get_allocated_height (da));
cairo_pattern_add_color_stop_rgb (pattern, 0.0, 1.0, 0.0, 0.0);
cairo_pattern_add_color_stop_rgb (pattern, 0.2, 1.0, 0.0, 0.0);
cairo_pattern_add_color_stop_rgb (pattern, 0.3, 1.0, 1.0, 0.0);
cairo_pattern_add_color_stop_rgb (pattern, 0.4, 0.0, 1.0, 0.0);
cairo_pattern_add_color_stop_rgb (pattern, 0.6, 0.0, 1.0, 1.0);
cairo_pattern_add_color_stop_rgb (pattern, 0.7, 0.0, 0.0, 1.0);
cairo_pattern_add_color_stop_rgb (pattern, 0.8, 1.0, 0.0, 1.0);
cairo_pattern_add_color_stop_rgb (pattern, 1.0, 1.0, 0.0, 1.0);
cairo_set_source (cr, pattern);
cairo_fill_preserve (cr);
cairo_pattern_destroy (pattern);
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
cairo_set_line_width (cr, 0.5);
cairo_stroke (cr);
cairo_restore (cr);
return TRUE;
}
GtkWidget *
do_textmask (GtkWidget *do_widget)
{
static GtkWidget *window = NULL;
static GtkWidget *da;
if (!window)
{
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_resizable (GTK_WINDOW (window), TRUE);
gtk_widget_set_size_request (window, 400, 200);
gtk_window_set_title (GTK_WINDOW (window), "Text Mask");
g_signal_connect (window, "destroy",
G_CALLBACK (gtk_widget_destroyed), &window);
da = gtk_drawing_area_new ();
gtk_container_add (GTK_CONTAINER (window), da);
g_signal_connect (da, "draw",
G_CALLBACK (draw_text), NULL);
}
if (!gtk_widget_get_visible (window))
gtk_widget_show_all (window);
else
gtk_widget_destroy (window);
return window;
}