def generate_inverse(self, *args):
# create forward transformation matrix
# NB this is done on width and height as well as init
# because when using texture size to compute size
# correct w/h info is not available on init!
ang = radians(self.rotangle) if self.rotated else 0
t = Matrix().translate(-self.width / 2 - self.x,
-self.height / 2 - self.y, 0)
t = Matrix().rotate(ang, 0, 0, 1).multiply(t)
t = Matrix().translate(self.x, self.y, 0).multiply(t)
self.inv = t.inverse()
class MachineScreen(Widget):
# Watched by the root app class. Set to True to close menus.
close_menus = BooleanProperty()
# Watched by the root app class. If either of these are set to not None, a menu will be shown
# in the root class.
selected_state = ObjectProperty(None, allownone=True)
selected_transition = ObjectProperty(None, allownone=True)
def __init__(self, **kwargs):
super(MachineScreen, self).__init__(**kwargs)
self.start_state = None
# This gets set by the root widget
self.undo_handler = None
self.states = []
self.transitions = []
self.handled_touches = []
# TODO: DON'T HARD CODE THIS
self.blank_char = '_'
self.canvas_created = False
# Used to differentiate between objects.
self.unique_id = 0
self.bgGrabbed = False
self.grabbed_object = None
self.initial_grab_pt = None
self.grabPt = (0, 0)
self.held_state = None
# Listened to by main.py to close state/transition menus.
self.close_menus = False
self.selected_state = None
# Initial distance between two touches.
self.initial_dist = 1
self.multitouch = False
self.previous_scale = 1
self.temp_scale = 1
# We check the simulator to see if its running when handling touches.
self.turing_simulator = None
self.state_group = InstructionGroup()
self.transition_group = InstructionGroup()
self.transitionline = TempTransitionLine(self.get_unique_id())
"""
Desc: Each object (for now state and transition) has a unique id. This is used predominately
in the display queue and in the undo handler.
"""
def get_unique_id(self):
self.unique_id += 1
return self.unique_id
"""
Desc: Creates a new machine by wiping the current states and transitions.
Clears the frame buffer, and resets the undo_handler.
"""
def create_new_machine(self):
# Removing visual components
self.fbo.bind()
self.fbo.clear_buffer()
for state in self.states:
invalid_transitions = state.delete()
self.state_group.remove_group(state.get_unique_id())
for transition in invalid_transitions:
self.transition_group.remove_group(transition.get_unique_id())
self.fbo.release()
self.undo_handler.reset()
self.states = []
self.transitions = []
self.start_state = None
# ------------------------ GRAPHICS ----------------------- #
"""
Desc: Called on the first resize (moving from default (100,100) dimensions)
Builds the frame buffer which we draw everything onto (much faster than individual widgets)
Also sets up our transformation matricies that we use for scaling and translations.
"""
def initialise_canvas(self, size):
self.matrix = Matrix()
with self.canvas:
self.fbo = Fbo(size=size)
Color(1, 1, 1, 1)
self.bg = Rectangle(size=self.size,
pos=self.pos,
texture=self.fbo.texture)
self.canvas_created = True
with self.fbo:
self.matrix_instruction = MatrixInstruction()
self.matrix_instruction.matrix = self.matrix
self.fbo.add(self.transition_group)
self.fbo.add(self.state_group)
"""
Desc: Bound in the root class, updates the widget size when app size is adjusted.
"""
def resize(self, size, pos):
if not self.canvas_created:
self.initialise_canvas(size)
self.bg.size = size
"""
Desc: Adds an instruction group at given index.
WARNING: Don't add at multiple index's without first clearing the
original instruction group from the display list.
"""
def add_at_index(self, ins, index):
self.fbo.bind()
self.fbo.clear_buffer()
self.fbo.insert(index, ins)
self.fbo.release()
"""
Desc: Moves an instruction group to the top of another instruction group.
EG. Moving a state to the top of the state display list.
The ins must already be in the ins_group or an exception will be raised.
"""
def add_to_top(self, ins_group, ins, ins_uid):
self.fbo.bind()
self.fbo.clear_buffer()
ins_group.remove_group(ins_uid)
ins_group.add(ins)
self.fbo.release()
self.fbo.ask_update()
"""
Desc: Updates the screen after the change of a graphic instruction.
If the graphic instruction doesn't change, this will clear the screen.
"""
def update_graphic_ins(self, ins, args):
self.fbo.bind()
self.fbo.clear_buffer()
return_value = ins(*args)
self.fbo.release()
self.fbo.ask_update()
return return_value
"""
Desc: Pans the main fbo by a vector delta.
"""
def pan(self, delta):
self.matrix = self.matrix.multiply(Matrix().translate(
delta[0], delta[1], 0))
self.fbo.bind()
self.fbo.clear_buffer()
self.matrix_instruction.matrix = self.matrix
self.fbo.release()
"""
Desc: Zooms the fbo at a world point by a factor. Keeps the screen centred on the zoom.
"""
def zoom(self, origin, factor):
self.matrix = self.matrix.multiply(Matrix().translate(
origin[0], origin[1], 0))
self.matrix = self.matrix.multiply(Matrix().scale(
factor, factor, factor))
self.matrix = self.matrix.multiply(Matrix().translate(
-origin[0], -origin[1], 0))
self.fbo.bind()
self.fbo.clear_buffer()
self.matrix_instruction.matrix = self.matrix
self.fbo.release()
# -------------------- COORDINATE FUNCTIONS --------------------- #
"""
Desc: Uses the transformation matrix we are using on the fbo to transfer a point on the root screen
to world space. (Used for adding transitions etc.)
"""
def screen_to_world(self, screenPos):
worldPos = self.matrix.inverse().transform_point(
screenPos[0], screenPos[1] - self.parent.y, 0)
return worldPos
"""
Desc: Uses the transformation matrix we are using on the fbo to transfer a point on our world screen to
the root app screen. (Used for getting the proper point to put state/transition menus at)
"""
def world_to_screen(self, objPos):
screenPos = self.matrix.transform_point(objPos[0], objPos[1], 0)
return (screenPos[0], screenPos[1] + self.parent.y, 0)
# -------------------- TOUCH EVENT HANDLERS ---------------------- #
"""
Desc: Handles a touch onto the gui. All touches are stored for later use (with multitouch functionality) and
also movement functionality such as dragging a state around.
"""
def handle_touch_down(self, instance, touch):
if touch not in self.handled_touches:
# Set up the reference variable. A single touch won't shut menus
# but a move (outside stray) or 'click' will shut menu.
self.close_menus = False
# Only want to handle at max 2 touches.
if len(self.handled_touches) < 2:
self.handled_touches.append(touch)
if not self.multitouch and len(self.handled_touches) == 2:
self.multitouch = True
# As this is the first multitouch, we want to close menus, drop held objects etc.
self.close_menus = True
self.bgGrabbed = False
self.grabbed_object = None
if self.held_state:
self.unhold_state(None)
if self.multitouch and len(self.handled_touches) == 2:
# Set up for scaling.
self.initial_dist = Vector(
self.handled_touches[0].pos).distance(
Vector(self.handled_touches[1].pos))
# Remember the current scale before more scaling.
self.temp_scale = self.previous_scale
"""
Desc: Handles a touch up (no matter where it happened, or even if we're tracking it)
If we are tracking the touch, various things can happen. If its a zoom we stop zooming,
if we're creating a transition we'll create it etc.
"""
def handle_touch_up(self, instance, touch):
# We no longer need to remember the touch, so remove it.
if touch in self.handled_touches:
self.handled_touches.remove(touch)
# To get out of multitouch mode all touches need to be removed. Simplifies things a bit.
if len(self.handled_touches) == 0:
self.multitouch = False
# If a touch and hold had been activated, we need to unhighlight the state.
self.unhold_state(touch.pos)
self.bgGrabbed = False
if self.grabbed_object:
self.undo_handler.add_action(
Action_MoveObject(self.grabbed_object.get_unique_id(),
self.initial_grab_pt,
self.grabbed_object.get_position()))
self.grabbed_object = None
"""
Desc: Handles a touch move on the gui. We are only interested in moves which origininated on the gui.
"""
def handle_touch_move(self, instance, move_triggered):
# Handling new touches to the machine.
touch = instance.curr_touch_move
if touch in self.handled_touches:
if not self.multitouch:
if touch.strayed:
self.close_menus = True
if not self.held_state:
if not self.grabbed_object and not self.bgGrabbed:
self.handle_initial_grab(touch.opos)
self.handle_grab(touch.pos)
else:
self.handle_transition_move(touch)
else:
self.handle_scale()
"""
Desc: Listens to the touchhandler for a click_triggered event. (ie, a quick tap)
If a transition or state is under the tap, it will be selected and an event will
be fired too the root app to create the respective menu.
"""
def handle_click(self, instance, click_triggered):
if click_triggered and not self.turing_simulator.run_mode:
world_pos = self.screen_to_world(instance.initial_touch.opos)
for state in self.states:
if Vector(world_pos).distance(Vector(
state.pos)) < state.radius:
if self.selected_transition:
self.deselect_objects()
self.close_menus = True
if self.selected_state and state is not self.selected_state:
self.deselect_objects()
self.update_graphic_ins(state.set_highlight, (0, 1, 1))
# Brings the selected state to the top of the display list.
self.add_to_top(self.state_group,
state.get_instruction_group(),
state.get_unique_id())
self.selected_state = state
return
for transition in self.transitions:
if transition.collide_point(world_pos):
if self.selected_state:
self.deselect_objects()
self.close_menus = True
if self.selected_transition and transition is not self.selected_transition:
self.deselect_objects()
self.update_graphic_ins(transition.set_highlight,
(0, 1, 1))
self.add_to_top(self.transition_group,
transition.get_instruction_group(),
transition.get_unique_id())
self.selected_transition = transition
return
# If we're at this point we know that no states/transitions have
# been selected.
self.close_menus = True
"""
Desc: Listens to the touchhandler for a hold_triggered event. If this happens ontop of a state we go into
transition creation mode.
"""
def handle_hold(self, instance, hold_triggered):
if hold_triggered and not self.turing_simulator.run_mode:
world_pos = self.screen_to_world(instance.initial_touch.opos)
for state in self.states:
if Vector(world_pos).distance(Vector(
state.pos)) < state.radius:
self.update_graphic_ins(state.set_highlight, (1, 1, 0))
self.held_state = state
"""
Desc: Listens to the touchhandler for a double_triggered event. If the double tap is on empty space
a new state will be created.
"""
def handle_double_touch(self, instance, double_triggered):
if double_triggered and not self.turing_simulator.run_mode:
world_pos = self.screen_to_world(instance.initial_touch.opos)
for state in self.states:
if Vector(world_pos).distance(Vector(
state.pos)) < state.radius:
return
self.add_state(instance.initial_touch.opos, False)
# -------------------------- MACHINE FUNCTIONS ------------------------ #
# (Majority of these will be called by the above touch handlers)
# Checks if either the background or a state has been selected on the move
# Background selected: Pan's camera
# State selected: Move state
def handle_initial_grab(self, pos):
world_pos = self.screen_to_world(pos)
self.grabPt = (world_pos[0], world_pos[1])
if not self.turing_simulator.run_mode:
for state in self.states:
if Vector(world_pos).distance(Vector(
state.pos)) < state.radius:
self.grabbed_object = state
self.add_to_top(self.state_group,
state.get_instruction_group(),
state.get_unique_id())
break
for transition in self.transitions:
if transition.collide_point(world_pos):
self.grabbed_object = transition
self.add_to_top(self.transition_group,
transition.get_instruction_group(),
transition.get_unique_id())
break
if self.grabbed_object:
self.initial_grab_pt = self.grabbed_object.get_position()
else:
self.bgGrabbed = True
def handle_grab(self, pos):
world_pos = self.screen_to_world(pos)
if self.grabbed_object:
self.update_graphic_ins(self.grabbed_object.set_position,
[world_pos])
elif self.bgGrabbed:
# pan by the delta position
self.pan(
(world_pos[0] - self.grabPt[0], world_pos[1] - self.grabPt[1]))
def handle_transition_move(self, touch):
world_pos = self.screen_to_world(touch.pos)
world_pos = (world_pos[0], world_pos[1])
if self.transitionline.displayed:
if Vector(world_pos).distance(Vector(
self.held_state.pos)) > self.held_state.radius:
self.update_graphic_ins(
self.transitionline.update_line,
(self.held_state.pos, world_pos, False))
else:
self.update_graphic_ins(self.transitionline.update_line,
(self.held_state.pos, world_pos, True))
else:
if Vector(world_pos).distance(Vector(
self.held_state.pos)) > self.held_state.radius:
self.transitionline.update_line(self.held_state.pos, world_pos,
False)
# Need to remove the held state and re-add it
self.update_graphic_ins(self.state_group.remove_group,
[self.held_state.get_unique_id()])
self.add_at_index(self.transitionline.get_instruction_group(),
3)
self.add_at_index(self.held_state.get_instruction_group(), 4)
self.transitionline.displayed = True
def handle_scale(self):
if len(self.handled_touches) == 2:
new_dist = Vector(self.handled_touches[0].pos).distance(
Vector(self.handled_touches[1].pos))
new_scale = (new_dist / self.initial_dist) * self.temp_scale
if new_scale < .8:
new_scale = .8
if new_scale > 3:
new_scale = 3
pivot_pt = self.screen_to_world(
(Vector(self.handled_touches[0].pos) +
Vector(self.handled_touches[1].pos)) / 2)
self.zoom(pivot_pt, new_scale / self.previous_scale)
self.previous_scale = new_scale
# If any states/transitions are selected removes the highlight and forgets
# the object.
def deselect_objects(self):
if self.selected_state:
# Stop the hold highlight disappearing.
if self.selected_state is not self.held_state:
self.update_graphic_ins(self.selected_state.set_highlight,
(.8, .8, .8))
self.selected_state = None
if self.selected_transition:
self.update_graphic_ins(self.selected_transition.set_highlight,
(.8, .8, .8))
self.selected_transition = None
# Handles a touch up after a hold.
# For now this is when a transition has tried to be created.
# pos: (x, y) or None if no transition is wanted to be created.
def unhold_state(self, pos):
if self.transitionline.displayed:
if pos:
world_pos = self.screen_to_world(pos)
for state in self.states:
if Vector(world_pos).distance(Vector(
state.pos)) < state.radius:
# Create a new transition.
self.add_transition(self.held_state, state, None, 'L',
self.blank_char, self.blank_char)
break
# Remove the state from the main buffer
self.update_graphic_ins(self.fbo.remove_group,
[self.held_state.get_unique_id()])
# Add it back to the state_group instruction group
self.update_graphic_ins(self.state_group.add,
[self.held_state.get_instruction_group()])
# Remove the temporary transition line from the main buffer
self.update_graphic_ins(self.fbo.remove_group,
[self.transitionline.get_unique_id()])
self.transitionline.displayed = False
if self.held_state:
self.update_graphic_ins(self.held_state.set_highlight,
(.8, .8, .8))
self.held_state = None
def add_transition(self,
from_state,
to_state,
anchor_offset,
direction,
read_sym,
write_sym,
unique_id=-1,
from_undo=False):
if from_state == to_state:
if not anchor_offset:
anchor_offset = Vector(
self.transitionline.loop_ctrl_pt) - Vector(from_state.pos)
else:
if not anchor_offset:
anchor_offset = (20, 20)
if unique_id == -1:
u_id = self.get_unique_id()
else:
u_id = unique_id
new_transition = TuringTransition(from_state, to_state, anchor_offset,
direction, read_sym, write_sym, u_id)
self.transitions.append(new_transition)
from_state.add_out_transition(new_transition)
if from_state is not to_state:
to_state.add_in_transition(new_transition)
if not from_undo:
self.undo_handler.add_action(Action_AddTransition(new_transition))
self.update_graphic_ins(self.transition_group.add,
[new_transition.get_instruction_group()])
def delete_transition(self, transition, from_undo=False):
if not from_undo:
self.undo_handler.add_action(Action_DeleteTransition(transition))
self.update_graphic_ins(self.transition_group.remove_group,
[transition.get_unique_id()])
transition.delete()
self.transitions.remove(transition)
def add_state(self,
new_pos,
absolute,
name='',
from_undo=False,
unique_id=-1):
if not absolute:
world_pos = self.screen_to_world(new_pos)
else:
world_pos = new_pos
if name == '':
state_name = 'state' + str(len(self.states))
i = 1
while self.get_state_by_name(state_name):
state_name = 'state' + str(len(self.states) + i)
i += 1
else:
state_name = name
self.deselect_objects()
if unique_id == -1:
u_id = self.get_unique_id()
else:
u_id = unique_id
new_state = TuringState(world_pos, state_name, u_id)
self.states.append(new_state)
self.update_graphic_ins(self.state_group.add,
[new_state.get_instruction_group()])
if not from_undo:
self.undo_handler.add_action(
Action_AddState(state_name, world_pos,
new_state.get_unique_id()))
return new_state
def delete_state(self, state, from_undo=False):
# Create the undo action now (before transitions are lost etc)
if not from_undo:
print('handle meh')
self.undo_handler.add_action(
Action_DeleteState(state.name, state.pos, state.final_state,
state.start_state,
state.out_transitions, state.in_transitions,
state.get_unique_id()))
# Makes sure we remove all references of the state
if state == self.start_state:
self.start_state = None
# Remove connected transitions
invalid_transitions = state.delete()
# Prepare the fbo for a redraw.
self.fbo.bind()
self.fbo.clear_buffer()
# Remove invalid transitions from display and local storage.
for transition in invalid_transitions:
self.transition_group.remove_group(transition.get_unique_id())
self.transitions.remove(transition)
# Remove from the display list
self.state_group.remove_group(state.get_unique_id())
# Remove from the state list
self.states.remove(state)
self.fbo.release()
def get_state_by_name(self, name):
for state in self.states:
if state.name == name:
return state
return None
def get_obj_by_id(self, unique_id):
for state in self.states:
if state.get_unique_id() == unique_id:
return state
for transition in self.transitions:
if transition.get_unique_id() == unique_id:
return transition
return None
