ADVERTENCIA : Este programa tiene un error de lógica. La vaca tiene hambre y quiere comerse el heno, ¡pero no pasa nada!
REGLA: Un controlador de eventos vincula un sprite a una función que se llama cada vez que se activa el evento.
Hacer clicCorre y mira lo que pasa. Mire en el código para ver dónde debería estar comiendo el heno la vaca.
Arregle el programa agregando un controlador de eventos a la función main() para que ocurra el evento de colisión.
Hacer clicEjecute para probar si arregló el programa. Cuando esté arreglado, haga clic enEnviar ysiguiente
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def add_sprite():
""" Add cow sprite to the stage and set its speed """
cow = codesters.Sprite("cow",-400, -150)
cow.set_x_speed(3)
return cow
def setup_stage():
""" Set up the stage with background and sprites """
stage.set_background("barn")
stage.disable_right_wall()
hay = codesters.Sprite("hay",-150,-150)
hay = codesters.Sprite("hay",0,-150)
hay = codesters.Sprite("hay",150,-150)
def collision(sprite, hit_sprite):
""" Collision event for the cow to eat hay """
if hit_sprite.get_image_name() == "hay":
sprite.say("yum!",.2)
hit_sprite.hide()
def main():
""" Sets up the program and calls other functions """
setup_stage()
sprite = add_sprite()
main()
t = codesters.Teacher()
defs = t.find_block("def")
collision_event_handlers = t.find_text("event_collision")
def get_above_def(line_number, def_list):
""" Returns the name of the nearest function and the distance above the given line number """
function_name = ""
distance = line_number - def_list[0][0]
for func in def_list:
if line_number - func[0] <= distance and line_number - func[0] > 0:
function_name = func[1]
distance = line_number - func[0]
return function_name, distance
def find_new_function(ignore_list, def_list):
""" Returns tuples of (line_number, function def) for any functions that aren't specified in ignore list """
return_list = []
for d in def_list:
count = 0
for i in ignore_list:
if i in d[1]:
break
else:
count += 1
if count == len(ignore_list):
return_list.append((d[0],d[1]))
return return_list
try:
tval2 = collision_event_handlers[0][1]
tval2_line_num = collision_event_handlers[0][0]
tval2_indent = t.get_indent_at_line(tval2_line_num)
except:
tval2 = "DNE"
tval2_line_num = "DNE"
tval2_indent = "DNE"
try:
above_def, distance = get_above_def(tval2_line_num, defs)
except:
above_def = "DNE"
distance = "DNE"
t1 = TestObjective()
t1.add_success("sprite." in tval2 and "(collision)" in tval2, "Great job!")
t1.add_failure(tval2 == "DNE", "Oops, did you add a Collision Event Handler to the main() function?")
t1.add_failure("sprite." not in tval2, "Oops, make sure the event handler is connecting to sprite!")
t1.add_failure("(collision)" not in tval2, "Oops, make sure the function in the event handler is collision?")
t2 = TestObjective()
t2.add_success("main" in above_def and tval2_indent == 4, "Great job!")
t2.add_failure("main" not in above_def, "Did you place Collision Event Handler within main()?")
t2.add_failure(tval2_indent < 0 or tval2_indent > 4, "Make sure that the event handler is indented once within main()!")
tester = TestManager()
tester.add_test_list([t1, t2])
tester.run_tests()
tester.display_first_feedback()
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