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Viewing changes to demo/misc/gradient-demo.py

  • Committer: gmtagliaretti
  • Date: 2008-05-18 17:12:38 UTC
  • Revision ID: svn-v4:aa6569b5-ad15-0410-a989-d4888eb19b46:trunk:211
Add a gradient example

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demo/misc/gradient-demo.py
 
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import sys
 
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import gobject
 
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import gtk
 
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import goocanvas
 
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import cairo
 
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def main(argv):
 
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    window = gtk.Window()
 
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    window.set_default_size(700, 350)
 
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    window.show()
 
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    window.connect("delete_event", on_delete_event)
 
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    scrolled_win = gtk.ScrolledWindow()
 
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    scrolled_win.set_shadow_type(gtk.SHADOW_IN)
 
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    scrolled_win.show()
 
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    window.add(scrolled_win)
 
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    canvas = goocanvas.Canvas()
 
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    canvas.set_size_request(700, 350)
 
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    canvas.set_bounds(0, 0, 1000, 1000)
 
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    canvas.show()
 
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    scrolled_win.add(canvas)
 
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    root = canvas.get_root_item()
 
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    # Create a Linear Patter with cairo 
 
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    linear = cairo.LinearGradient(50, 50, 300, 300)
 
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    linear.add_color_stop_rgba(0.0,  1, 1, 1, 0)
 
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    linear.add_color_stop_rgba(0.25,  0, 1, 0, 0.5)
 
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    linear.add_color_stop_rgba(0.50,  1, 1, 1, 0)
 
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    linear.add_color_stop_rgba(0.75,  0, 0, 1, 0.5)
 
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    linear.add_color_stop_rgba(1.0,  1, 1, 1, 0)
 
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   # Create a rect to be filled with the linear gradient
 
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    item = goocanvas.Rect(x=50, y=50, width=250, height=250,
 
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                          line_width=10.0,
 
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                          radius_x=20.0,
 
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                          radius_y=10.0,
 
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                          fill_pattern=linear)
 
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    root.add_child(item, 0)
 
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    item.connect("button-press-event", on_rect_button_press)
 
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    item = goocanvas.Text(parent=root,
 
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                          text="Linear Gradient",
 
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                          x=175, y=175,
 
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                          anchor=gtk.ANCHOR_CENTER,
 
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                          font="Sans 24")
 
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    item.rotate(315, 175, 175)
 
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    # Create a Radial Patter with cairo 
 
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    radial = cairo.RadialGradient(450, 150, 15, 600, 250, 55)
 
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    radial.add_color_stop_rgb(0,  1.0, 0.8, 0.8)
 
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    radial.add_color_stop_rgb(0.50,  0.9, 0.5, 0.0)
 
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    radial.add_color_stop_rgb(1,  0.9, 0.0, 0.0)
 
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   # Create a rect to be filled with the radial gradient
 
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    item = goocanvas.Rect(parent=root,
 
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                          x=400, y=50, width=250, height=250,
 
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                          line_width=10.0,
 
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                          radius_x=20.0,
 
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                          radius_y=10.0,
 
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                          fill_pattern=radial)
 
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    item.connect("button-press-event", on_rect_button_press)
 
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    item = goocanvas.Text(parent=root,
 
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                          text="Radial Gradient",
 
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                          x=525, y=175,
 
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                          anchor=gtk.ANCHOR_CENTER,
 
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                          font="Sans 24")
 
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    item.rotate(315, 525, 175)
 
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    gtk.main()
 
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## This handles button presses in item views. We simply output a message to
 
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##   the console.
 
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def on_rect_button_press (view, target, event):
 
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    target.set_simple_transform(50, 50 , 1, 0)
 
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    print "rect item received button press event"
 
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    return True
 
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## This is our handler for the "delete-event" signal of the window, which
 
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##   is emitted when the 'x' close button is clicked. We just exit here. */
 
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def on_delete_event(window, event):
 
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    raise SystemExit
 
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if __name__ == "__main__":
 
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    main(sys.argv)
 
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