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#Copyright (c) 2008, Media Modifications Ltd.
#Permission is hereby granted, free of charge, to any person obtaining a copy
#of this software and associated documentation files (the "Software"), to deal
#in the Software without restriction, including without limitation the rights
#to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#copies of the Software, and to permit persons to whom the Software is
#furnished to do so, subject to the following conditions:
#The above copyright notice and this permission notice shall be included in
#all copies or substantial portions of the Software.
#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
#THE SOFTWARE.
import gtk
from gtk import gdk
import gobject
import cairo
import math
#Sometimes a gtk.Image is a useful alternative to a drawing area. You can put a gtk.gdk.Pixmap in the gtk.Image and draw to the gtk.gdk.Pixmap, calling the gtk.Widget.queue_draw() method on the gtk.Image when you want to refresh to the screen.
class P5(gtk.DrawingArea):
def __init__(self):
super(P5, self).__init__()
# gtk.Widget signals
self.connect("expose_event", self.expose)
self.connect("button_press_event", self.button_press)
self.connect("button_release_event", self.button_release)
self.connect("motion_notify_event", self.motion_notify)
# ok, we have to listen to mouse events here too
self.add_events(gdk.BUTTON_PRESS_MASK | gdk.BUTTON_RELEASE_MASK | gdk.POINTER_MOTION_MASK)
self._dragging = False
self._mouseX = 0
self._mouseY = 0
self._w = -1
self._h = -1
#ok, this calls an initial painting & setting of painterly variables
#e.g. time for the clock widget
#(but not through to redraw_canvas when called here first time)
self._msecUpdate = 100
self._looping = False
self.noloop()
def loop(self):
if (self._looping):
return
else:
self._looping = True
# this is our maybe-threaded refresh (in millisecs)
gobject.timeout_add( self._msecUpdate, self.update )
def noloop(self):
self._looping = False
self.redraw()
def redraw(self):
self.update()
def expose(self, widget, event):
ctx = widget.window.cairo_create()
# set a clip region for the expose event
ctx.rectangle(event.area.x, event.area.y, event.area.width, event.area.height)
ctx.clip()
rect = widget.allocation
#self.draw(ctx, event.area.width, event.area.height)
self.draw( ctx, rect.width, rect.height )
def button_press(self, widget, event):
self._mouseX = event.x
self._mouseY = event.y
self._dragging = True
def button_release(self, widget, event):
if self._dragging:
self._dragging = False
def motion_notify(self, widget, event):
self._mouseX = event.x
self._mouseY = event.y
def draw(self, ctx, w, h):
ctx.set_antialias( cairo.ANTIALIAS_NONE )
ctx.set_line_width( 1 )
ctx.identity_matrix( )
if ((w != self._w) or (h != self._h)):
self._w = w
self._h = h
self.doResize( )
def doResize(self):
pass
#called from update
def redraw_canvas(self):
if self.window:
alloc = self.get_allocation()
#this is odd behavior, but once we add this widget to a parent (vbox)
#it requires setting the q_d_a x,y to 0, 0
#self.queue_draw_area(alloc.x, alloc.y, alloc.width, alloc.height)
self.queue_draw_area(0, 0, alloc.width, alloc.height)
self.window.process_updates(True)
def update(self):
#paint thread -- call redraw_canvas, which calls expose
self.redraw_canvas()
if (self._looping):
return True # keep running this event
else:
return False
def drawShape( self, ctx, poly, col ):
self.setColor( ctx, col )
for i in range ( 0, len(poly._xs) ):
ctx.line_to ( poly._xs[i], poly._ys[i] )
ctx.close_path()
ctx.set_line_width(1)
ctx.stroke()
def fillShape( self, ctx, poly, col ):
self.setColor( ctx, col )
for i in range ( 0, len(poly._xs) ):
ctx.line_to (poly._xs[i], poly._ys[i])
ctx.close_path()
ctx.fill()
def background( self, ctx, col, w, h ):
self.setColor( ctx, col )
ctx.line_to(0, 0)
ctx.line_to(w, 0)
ctx.line_to(w, h)
ctx.line_to(0, h)
ctx.close_path()
ctx.fill()
def rect( self, ctx, x, y, w, h ):
ctx.line_to(x, y)
ctx.line_to(x+w, y)
ctx.line_to(x+w, y+h)
ctx.line_to(x, y+h)
ctx.close_path()
def setColor( self, ctx, col ):
if (not col._opaque):
ctx.set_source_rgba( col._r, col._g, col._b, col._a )
else:
ctx.set_source_rgb( col._r, col._g, col._b )
def line( self, ctx, x1, y1, x2, y2 ):
ctx.move_to (x1, y1)
ctx.line_to (x2, y2)
ctx.stroke()
def point( self, ctx, x1, y1 ):
self.line( ctx, x1, y1, x1+1, y1 )
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