[cairo-commit] [cairo-www] src/quickframework.mdwn

[Carl Worth]

 src/quickframework.mdwn |   66 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

New commits:
commit f218c94611e21afd230be6f8b17977f4422afb0a
Author: Donn <donn.ingle at gmail.com>
Date:   Tue Nov 6 06:11:47 2007 -0800

    Donn

diff --git a/src/quickframework.mdwn b/src/quickframework.mdwn
new file mode 100644
index 0000000..91358c2
--- /dev/null
+++ b/src/quickframework.mdwn
@@ -0,0 +1,66 @@
+##A Quick GTK GNU/Linux Framework
+
+I can't recall where I got this online, but it's handy for running snippets of cairo code to see what's going on.
+
+
+    #! /usr/bin/env python
+    import pygtk
+    pygtk.require('2.0')
+    import gtk, gobject, cairo
+    
+    # Create a GTK+ widget on which we will draw using Cairo
+    class Screen(gtk.DrawingArea):
+    
+        # Draw in response to an expose-event
+        __gsignals__ = { "expose-event": "override" }
+    
+        # Handle the expose-event by drawing
+        def do_expose_event(self, event):
+    
+            # Create the cairo context
+            cr = self.window.cairo_create()
+    
+            # Restrict Cairo to the exposed area; avoid extra work
+            cr.rectangle(event.area.x, event.area.y,
+                    event.area.width, event.area.height)
+            cr.clip()
+    
+            self.draw(cr, *self.window.get_size())
+    
+        def draw(self, cr, width, height):
+            # Fill the background with gray
+            cr.set_source_rgb(0.5, 0.5, 0.5)
+            cr.rectangle(0, 0, width, height)
+            cr.fill()
+    
+    # GTK mumbo-jumbo to show the widget in a window and quit when it's closed
+    def run(Widget):
+        window = gtk.Window()
+        window.connect("delete-event", gtk.main_quit)
+        widget = Widget()
+        widget.show()
+        window.add(widget)
+        window.present()
+        gtk.main()
+    
+    #######################
+    ## Do all your testing in Shapes ##
+    #######################
+    
+    class Shapes(Screen):
+        def draw(self, cr, width, height):
+            
+            ## This will draw using a mask.
+            cr.scale(width,height)
+            self.linear = cairo.LinearGradient(0, 0, 1, 1)
+            self.linear.add_color_stop_rgb(0, 0, 0.3, 0.8)
+            self.linear.add_color_stop_rgb(1, 0, 0.8, 0.3)
+            
+            self.radial = cairo.RadialGradient(0.5, 0.5, 0.25, 0.5, 0.5, 0.5)
+            self.radial.add_color_stop_rgba(0, 0, 0, 0, 1)
+            self.radial.add_color_stop_rgba(0.5, 0, 0, 0, 0)
+            
+            cr.set_source(self.linear)
+            cr.mask(self.radial)       
+    
+    run(Shapes)