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Hi,<br>
<br>
On 19/12/09 20:41, Brent Chiodo wrote:
<blockquote
cite="mid:f61f40e90912191141o5951d01bxaf063a55697df841@mail.gmail.com"
type="cite">Hi,<br>
<br>
I'm trying to make the background of a Desktop Widget semi-transparent
using the cairo graphics library. The widget is written in Python and
the only examples of this I've found are using C (I don't know much C
-- I wasn't even able to apply the examples to Python).<br>
<br>
</blockquote>
<br>
I haven't tried in Python, but there's this blog entry by Zaheer Abbas
Merali which explains how to do it:<br>
<a class="moz-txt-link-freetext" href="http://zaheer.merali.org/articles/2009/10/12/maemo-widget-experience-circular-clock-with-transparent-background/">http://zaheer.merali.org/articles/2009/10/12/maemo-widget-experience-circular-clock-with-transparent-background/</a><br>
<br>
Hope that helps,<br>
marcoil<br>
<br>
<blockquote
cite="mid:f61f40e90912191141o5951d01bxaf063a55697df841@mail.gmail.com"
type="cite">This is the current code (that doesn't work -- the
background appears as a black box)<br>
<br>
<br>
def __init__(self):<br>
hildondesktop.HomePluginItem.__init__(self)<br>
...<br>
self..connect("screen-changed", self.screen_changed)<br>
self.connect("expose-event", self.expose)<br clear="all">
<br>
<br>
def expose(self, widget, event):<br>
cr = self.window.cairo_create()<br>
cr.set_source_rgba(1.0, 1.0, 1.0, 0.0) # Transparent<br>
<br>
# Draw the background<br>
cr.set_operator(cairo.OPERATOR_SOURCE)<br>
cr.paint()<br>
<br>
# draw rounded rect<br>
width, height = self.allocation[2], self.allocation[3]<br>
<br>
#/* a custom shape, that could be wrapped in a function */<br>
x0 = 0 #/*< parameters like cairo_rectangle */<br>
y0 = 0<br>
<br>
radius = min(15, width/2, height/2) #/*< and an approximate
curvature radius */<br>
<br>
x1 = x0 + width<br>
y1 = y0 + height<br>
<br>
cr.move_to (x0, y0 + radius)<br>
cr.arc (x0 + radius, y0 + radius, radius, 3.14, 1.5 * 3.14)<br>
cr.line_to (x1 - radius, y0)<br>
cr.arc (x1 - radius, y0 + radius, radius, 1.5 * 3.14, 0.0)<br>
cr.line_to (x1 , y1 - radius)<br>
cr.arc (x1 - radius, y1 - radius, radius, 0.0, 0.5 * 3.14)<br>
cr.line_to (x0 + radius, y1)<br>
cr.arc (x0 + radius, y1 - radius, radius, 0.5 * 3.14, 3.14)<br>
<br>
cr.close_path ()<br>
<br>
bg_color=gtk.gdk.color_parse("#000000")<br>
<br>
cr.set_source_rgba (bg_color.red / 65535.0,
bg_color.green/65535.0, bg_color.blue/65535.0, float(32767/65535.0))<br>
cr.fill_preserve ()<br>
# cr.set_source_rgba (0.5, 0.5, 1.0, 0.8)<br>
# cr.stroke ()<br>
<br>
def screen_changed(self, widget):<br>
screen = self.get_screen()<br>
colormap = screen.get_rgba_colormap()<br>
self.set_colormap(colormap)<br>
<br>
return False<br>
<br>
<br>
What I'm trying to do is have the widget appear semi-transparent with
rounded corners (like most widgets look) but the above code does not
work at all. I do not know much about cairo and got most of that code
from Khertan's HomeIP widget for Diablo/Chinook and only modified it a
little to work with Maemo 5.<br>
<br>
Any help would be greatly appreciated. I've been "banging my head
against a wall" for a while with this one.<br>
<br>
-- <br>
Best Regards,<br>
<br>
Brent Chiodo<br>
<pre wrap="">
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</blockquote>
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