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# Copyright 2008 by Peter Moxhay and Wade Brainerd.
# This file is part of Math.
#
# Math 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 3 of the License, or
# (at your option) any later version.
#
# Math 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 Math. If not, see <http://www.gnu.org/licenses/>.
import gtk
from vector import Vector
from droptargetobject import DropTargetObject
from linesegmentobject import LineSegmentObject
from linesegmentmovableobject import LineSegmentMovableObject
DEBUG = False
class LineSegmentDropTarget(DropTargetObject):
"""Drop target which line segments can be dropped."""
def __init__(self, pos, container):
DropTargetObject.__init__(self, pos, Vector(80, 270), container)
self.draggable = False
self.selectable = False
self.hilite = False
self.contents = None
self.drop_origin = None
self.drop_targets = None
self.full = False
self.shape1 = None
self.shape2 = None
self.answer = 'equal'
def draw(self, cr):
#cr.set_source_rgb(0, 1, 1)
#self_bounds_mn, self_bounds_mx = self.get_bounds()
#cr.rectangle(self_bounds_mn.x, self_bounds_mn.y, self_bounds_mx.x - self_bounds_mn.x, self_bounds_mx.y - self_bounds_mn.y)
#cr.fill()
cr.rectangle(self.pos.x, self.pos.y, self.size.x, self.size.y)
cr.set_source_rgb(0, 0, 0)
cr.set_line_width(4.0)
if self.hilite:
cr.set_dash((10, 10), 0)
cr.stroke()
n = 0
n = self.how_many_line_segment_movables_inside()
def how_many_line_segment_movables_inside(self):
i = 0
for o in self.container.objects:
if isinstance(o, LineSegmentMovableObject):
if self.contains(o.get_bounds()):
i += 1
return i
def get_bounds(self):
#return self.pos - Vector(2,2), self.pos + self.size
return self.pos - Vector(2,2), self.pos + self.size + Vector(0,2)
def contains(self, other_bounds):
self_bounds_mn, self_bounds_mx = self.get_bounds()
other_bounds_mn, other_bounds_mx = other_bounds
if other_bounds_mn.x > self_bounds_mn.x \
and other_bounds_mx.x < self_bounds_mx.x \
and other_bounds_mn.y > self_bounds_mn.y \
and other_bounds_mx.y < self_bounds_mx.y :
return True
else:
return False
def processDrop(self, draggable_object):
if DEBUG:
print "LineSegmentDropTarget: processDrop called on object at ", self.pos
if not isinstance(draggable_object, LineSegmentObject) and not isinstance(draggable_object, LineSegmentMovableObject):
if DEBUG:
print "LineSegmentDropTarget: not a LineSegmentMovableObject"
return False
else:
if DEBUG:
print "LineSegmentDropTarget: IS LineSegmentMovableObject!"
if self.full:
self.drop_origin.reset()
return False
if isinstance(draggable_object, LineSegmentMovableObject):
if draggable_object.length == 100:
movable_object = LineSegmentMovableObject(Vector(40, 10), 100, self.drop_targets, self.container)
movable_object.move(self.pos + Vector(40, 160))
elif draggable_object.length == 200:
movable_object = LineSegmentMovableObject(Vector(40, 110), 200, self.drop_targets, self.container)
movable_object.move(self.pos + Vector(40, 60))
draggable_object.move(Vector(10000, 10000))
draggable_object.dragged = False
draggable_object.selected = False
draggable_object.draggable = False
draggable_object.selectable = False
draggable_object.drag_type = None
draggable_object.moving_by_key_press = False
# Get rid of the incoming MovableObject.
self.remove_object(draggable_object)
movable_object.dragged = False
#movable_object.selected = True
if self.container:
self.container.select_object(movable_object)
movable_object.draggable = True
movable_object.selectable = True
movable_object.drop_targets = self.drop_targets
movable_object.drop_origin = self.drop_origin
if self.container:
self.container.add_object(movable_object)
self.contents = movable_object
self.full = True
self.hilite = False
self.queue_draw()
if self.drop_origin:
if self.container:
self.container.select_object(self.drop_origin.line1)
else:
#print "LineSegmentDropTarget: creating LineSegmentMovableObject with drop targets",self.drop_targets
#print "LineSegmentDropTarget: len(self.drop_targets) =",len(self.drop_targets)
if draggable_object.length == 100:
movable_object = LineSegmentMovableObject(Vector(40, 10), 100, self.drop_targets, self.container)
movable_object.move(self.pos + Vector(40, 160))
elif draggable_object.length == 200:
movable_object = LineSegmentMovableObject(Vector(40, 110), 200, self.drop_targets, self.container)
movable_object.move(self.pos + Vector(40, 60))
draggable_object.move(Vector(10000, 10000))
draggable_object.dragged = False
draggable_object.selected = False
draggable_object.draggable = False
draggable_object.selectable = False
draggable_object.drag_type = None
draggable_object.moving_by_key_press = False
movable_object.dragged = False
movable_object.selected = False
movable_object.draggable = True
movable_object.selectable = True
movable_object.drop_targets = self.drop_targets
movable_object.drop_origin = self.drop_origin
self.container.add_object(movable_object)
self.contents = movable_object
self.full = True
self.hilite = False
self.queue_draw()
if self.drop_origin:
self.container.select_object(self.drop_origin.line1)
if not self.answer_correct() and self.all_drop_targets_full():
self.reset_all_drop_targets()
self.container.register_error()
elif self.answer_correct():
self.container.selected_object = None
self.freeze_drop_targets()
self.container.finish_problem_stage2()
if self.drop_origin:
self.drop_origin.reset()
return True
def freeze_drop_targets(self):
for o in self.drop_targets:
o.contents.selected = False
o.contents.selectable = False
o.contents.dragged = False
o.contents.draggable = False
o.full = False
def reset_all_drop_targets(self):
for o in self.drop_targets:
o.reset()
o.full = False
def reset(self):
self.remove_object(self.contents)
def all_drop_targets_full(self):
b = True
for o in self.drop_targets:
if not o.full:
b = False
break
return b
def answer_correct(self):
b = False
if self.drop_targets[0].full and self.drop_targets[1].full:
if self.answer == 'greater' \
and self.drop_targets[0].contents.length > self.drop_targets[1].contents.length:
b = True
elif self.answer == 'equal' \
and self.drop_targets[0].contents.length == self.drop_targets[1].contents.length:
b = True
elif self.answer == 'less' \
and self.drop_targets[0].contents.length < self.drop_targets[1].contents.length:
b = True
return b
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