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# Copyright (C) 2008, 2009 Sayamindu Dasgupta <sayamindu@gmail.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import gtk
import gobject
import goocanvas
import math
import uuid
DEFAULT_WIDTH = 10
DEFAULT_HEIGHT = 10
CANVAS_WIDTH = 1187
CANVAS_HEIGHT = 767
class ScribbleWidget(goocanvas.Canvas):
__gsignals__ = {
'item-added': (gobject.SIGNAL_RUN_FIRST,
gobject.TYPE_NONE,
([])),
}
def __init__(self):
goocanvas.Canvas.__init__(self)
self.set_size_request(CANVAS_WIDTH, CANVAS_HEIGHT)
self.set_bounds(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT)
self.connect("button_press_event", self.on_button_press)
self.connect("button_release_event", self.on_button_release)
self.connect("motion_notify_event", self.on_motion)
self._root = self.get_root_item()
self.tool = None
self.item = None
self.item_id = None
self.item_orig_x = 0
self.item_orig_y = 0
self.item_width = 0
self.item_height = 0
self.line_points = []
self.prev_time = 0
self._fill_color = 0
self._stroke_color = 0
self.cmd = None # method to draw the last item
self.cmd_list = "" # list of methods to draw the entire canvas
def set_fill_color(self, color):
self._fill_color = int(color.strip('#')+'FF', 16)
def set_stroke_color(self, color):
self._stroke_color = int(color.strip('#')+'FF', 16)
def set_tool(self, tool):
self.tool = tool
def create_item(self, x, y):
self.item_id = str(uuid.uuid4())
self.item_orig_x = x
self.item_orig_y = y
self.item_width = DEFAULT_WIDTH
self.item_height = DEFAULT_HEIGHT
if self.tool == 'circle':
self.item = goocanvas.Ellipse(parent=self._root, center_x=x, \
center_y=y, radius_x = DEFAULT_WIDTH/2, \
radius_y = DEFAULT_HEIGHT/2, title=self.item_id, \
fill_color_rgba = self._fill_color, \
stroke_color_rgba = self._stroke_color)
elif self.tool == 'rect':
self.item = goocanvas.Rect(parent=self._root, x=x, y=y, \
width=DEFAULT_WIDTH, height=DEFAULT_HEIGHT, \
fill_color_rgba = self._fill_color, \
stroke_color_rgba = self._stroke_color, title=self.item_id)
elif self.tool == 'pencil':
self.line_points = [] #Reset
self.line_points.append((x, y))
self.item = goocanvas.Polyline(parent=self._root, \
points=goocanvas.Points(self.line_points), \
stroke_color_rgba = self._stroke_color, title=self.item_id)
else:
pass
def process_motion(self, x, y, time):
dx = x - self.item_orig_x
dy = y - self.item_orig_y
dt = time - self.prev_time
if self.tool == 'circle':
self.item.props.radius_x = abs(dx)
self.item.props.radius_y = abs(dy)
elif self.tool == 'rect':
if dx < 0:
self.item.props.x = x
#self.item_orig_x = x
if dy < 0:
self.item.props.y = y
#self.item_orig_y = y
self.item.props.width = abs(dx)
self.item.props.height = abs(dy)
elif self.tool == 'pencil':
#XXX: This is pretty ugly - we should try some curve fitting stuff
dist = abs(math.sqrt(dx*dx + dy*dy))
self.line_points.append((x, y))
if dist > 10 or dt > 10:
self.item.props.points = goocanvas.Points(self.line_points)
self.item_orig_x = x
self.item_orig_y = y
self.prev_time = time
def get_cmd(self):
return self.cmd
def get_cmd_list(self):
return self.cmd_list
def process_item_finalize(self):
if self.tool == 'circle':
self.cmd = "goocanvas.Ellipse(parent=self._root, center_x=%d, \
center_y=%d, radius_x = %d, radius_y = %d, \
fill_color_rgba = %d, stroke_color_rgba = %d, \
title = '%s')" % (self.item.props.center_x, \
self.item.props.center_y, self.item.props.radius_x, \
self.item.props.radius_y, self._fill_color, \
self._stroke_color, self.item_id)
elif self.tool == 'rect':
self.cmd = "goocanvas.Rect(parent=self._root, x=%d, y=%d, \
width=%d, height=%d, fill_color_rgba = %d, \
stroke_color_rgba = %d, title = '%s')" % (self.item.props.x, \
self.item.props.y, self.item.props.width, \
self.item.props.height, self._fill_color, self._stroke_color, \
self.item_id)
elif self.tool == 'pencil':
self.cmd = "goocanvas.Polyline(parent=self._root, \
points=goocanvas.Points(%s), stroke_color_rgba = %d, \
title = '%s')" % (str(self.line_points), self._stroke_color, \
self.item_id)
#print self.cmd
if len(self.cmd_list) > 0:
self.cmd_list += (';' + self.cmd)
else:
self.cmd_list = self.cmd
self.emit('item-added')
def process_cmd(self, cmd):
#print 'Processing cmd :' + cmd
exec(cmd) #FIXME: Ugly hack, but I'm too lazy to do this nicely
if len(self.cmd_list) > 0:
self.cmd_list += (';' + cmd)
else:
self.cmd_list = cmd
def on_button_press(self, canvas, event):
self.create_item(event.x, event.y)
fleur = gtk.gdk.Cursor(gtk.gdk.FLEUR)
canvas.pointer_grab(self.item, \
gtk.gdk.POINTER_MOTION_MASK | \
gtk.gdk.POINTER_MOTION_HINT_MASK | gtk.gdk.BUTTON_RELEASE_MASK,
fleur, event.time)
return True
def on_button_release(self, canvas, event):
canvas.pointer_ungrab(self.item, event.time)
self.process_item_finalize()
return True
def on_motion(self, canvas, event):
if event.is_hint:
x, y, state = event.window.get_pointer()
else:
x = event.x
y = event.y
state = event.state
if not state & gtk.gdk.BUTTON1_MASK:
return False
self.process_motion(x, y, event.time)
return True
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