From 26a04d153da54e1716ddecef5f2db0989ae3c0f3 Mon Sep 17 00:00:00 2001
From: "Gustavo J. A. M. Carneiro" <gjc@src.gnome.org>
Date: Mon, 6 Jun 2005 22:21:49 +0000
Subject: pygtk + cairo \!\!

---
 examples/Makefile.am                |  1 +
 examples/gtk/widget.py              | 44 +++++++++++++++++++++-------
 examples/pango/pangocairo-simple.py | 58 +++++++++++++++++++++++++++++++++++++
 3 files changed, 92 insertions(+), 11 deletions(-)
 create mode 100644 examples/pango/pangocairo-simple.py

(limited to 'examples')

diff --git a/examples/Makefile.am b/examples/Makefile.am
index 1802c2dc..0a05edf1 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -54,6 +54,7 @@ EXTRA_DIST = \
 	neil/notebook.py	\
 	neil/question.xpm	\
 	pango/utf8-demo.py	\
+	pango/pangocairo-simple.py \
 	simple/README		\
 	simple/dnd.py		\
 	simple/dndpixmap.py	\
diff --git a/examples/gtk/widget.py b/examples/gtk/widget.py
index 9bb27986..51e187e3 100644
--- a/examples/gtk/widget.py
+++ b/examples/gtk/widget.py
@@ -5,6 +5,10 @@ import gobject
 import pango
 import gtk
 from gtk import gdk
+try:
+    import cairo
+except ImportError:
+    pass
 
 if gtk.pygtk_version < (2,3,93):
     print "PyGtk 2.3.93 or later required for this example"
@@ -21,7 +25,6 @@ class PyGtkWidget(gtk.Widget):
 		     }
     def __init__(self):
         gtk.Widget.__init__(self)
-
         self.draw_gc = None
         self.layout = self.create_pango_layout(TEXT)
         self.layout.set_font_description(pango.FontDescription("sans serif 16"))
@@ -34,10 +37,11 @@ class PyGtkWidget(gtk.Widget):
                                  window_type=gdk.WINDOW_CHILD,
                                  wclass=gdk.INPUT_OUTPUT,
                                  event_mask=self.get_events() | gdk.EXPOSURE_MASK)
-        self.draw_gc = gdk.GC(self.window,
-                              line_width=5,
-                              line_style=gdk.SOLID,
-                              join_style=gdk.JOIN_ROUND)
+        if not hasattr(self.window, "cairo_create"):
+            self.draw_gc = gdk.GC(self.window,
+                                  line_width=5,
+                                  line_style=gdk.SOLID,
+                                  join_style=gdk.JOIN_ROUND)
 	self.window.set_user_data(self)
         self.style.attach(self.window)
         self.style.set_background(self.window, gtk.STATE_NORMAL)
@@ -53,9 +57,7 @@ class PyGtkWidget(gtk.Widget):
         if self.flags() & gtk.REALIZED:
             self.window.move_resize(*allocation)
 
-    def do_expose_event(self, event):
-        self.chain(event)
-
+    def _expose_gdk(self, event):
         x, y, w, h = self.allocation
         self.window.draw_rectangle(self.draw_gc, False,
                                    BORDER_WIDTH, BORDER_WIDTH,
@@ -65,14 +67,34 @@ class PyGtkWidget(gtk.Widget):
                                 event.area, self, "label",
                                 (w - fontw) / 2, (h - fonth) / 2,
                                 self.layout)
-            
-gobject.type_register(PyGtkWidget)
+
+    def _expose_cairo(self, event, cr):
+        x, y, w, h = self.allocation
+        cr.set_source_color(self.style.fg[self.state])
+        cr.rectangle(BORDER_WIDTH, BORDER_WIDTH,
+                     w - 2*BORDER_WIDTH, h - 2*BORDER_WIDTH)
+        cr.set_line_width(5.0)
+        cr.set_line_join(cairo.LINE_JOIN_ROUND)
+        cr.stroke()
+        fontw, fonth = self.layout.get_pixel_size()
+        cr.move_to((w - fontw)/2, (h - fonth)/2)
+        cr.update_layout(self.layout)
+        cr.show_layout(self.layout)
+
+    def do_expose_event(self, event):
+        self.chain(event)
+        try:
+            cr = self.window.cairo_create()
+        except AttributeError:
+            return self._expose_gdk(event)
+        return self._expose_cairo(event, cr)
+    
 
 win = gtk.Window()
 win.set_title(TEXT)
 win.connect('delete-event', gtk.main_quit)
 
-frame = gtk.Frame("Show me a bug")
+frame = gtk.Frame("Example frame")
 win.add(frame)
 
 w = PyGtkWidget()
diff --git a/examples/pango/pangocairo-simple.py b/examples/pango/pangocairo-simple.py
new file mode 100644
index 00000000..c38b8611
--- /dev/null
+++ b/examples/pango/pangocairo-simple.py
@@ -0,0 +1,58 @@
+#! /usr/bin/env python
+import sys
+import math
+import pango
+import cairo
+import pangocairo
+
+RADIUS = 150
+
+def draw_text(cr):
+    N_WORDS = 10
+    FONT = "Sans Bold 27"
+
+    # Center coordinates on the middle of the region we are drawing
+    cr.translate(RADIUS, RADIUS);
+
+    # Create a PangoLayout, set the font and text */
+    layout = cr.create_layout()
+  
+    layout.set_text("Text")
+    layout.set_font_description(pango.FontDescription(FONT))
+
+    # Draw the layout N_WORDS times in a circle
+    for i in range(N_WORDS):
+         angle = (360 * i) / N_WORDS;
+         cr.save()
+
+         # Gradient from red at angle == 60 to blue at angle == 300
+         red   = (1 + math.cos((angle - 60)*math.pi/180))/2
+         cr.set_source_rgb(red, 0, 1 - red)
+         cr.rotate(angle*math.pi/180)
+    
+         # Inform Pango to re-layout the text with the new transformation */
+         cr.update_layout(layout)
+    
+         width, height = layout.get_size()
+         cr.move_to(-width/pango.SCALE/2, -RADIUS)
+         cr.show_layout(layout)
+
+         cr.restore()
+
+def main(argv):
+    if len(argv) != 2:
+        print >> sys.stderr, "Usage: cairosimple OUTPUT_FILENAME.png\n"
+        return 1
+
+    filename = argv[1]
+    surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 2*RADIUS, 2*RADIUS)
+    cr = pangocairo.CairoContext(cairo.Context(surface))
+    cr.set_source_rgb(1.0, 1.0, 1.0)
+    cr.rectangle(0, 0, 2*RADIUS, 2*RADIUS)
+    cr.fill()
+    draw_text(cr)
+
+    surface.write_to_png(filename)
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))
-- 
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