week 13 event driven programming

Question 1

event

Answer 1

when something happens (ex: user clocks button)

Question 2

turtle events

Answer 2

t.onclick()
t.ondrag()
t.onrelease()

Question 3

screen events

Answer 3

s.onclick()
s.onkey()
s.ontimer()

Question 4

additional functions needed for screen events

Answer 4

s.listen()
s.mainloop()

Question 5

onkey() call for screen event

Answer 5

s.onkey(up, “up”)

up is function that specifies instructions when the up key is clicked

Question 6

onclick() call for turtle event

Answer 6

t.onclick(whenPressed)

funciton whenPressed takes x, y coordinates as arguments

Question 7

why are global variables useful for turtle events?

Answer 7

the only parameters the function can take are x,y coordinates, anything else should be a global var

Question 8

are turtles global variables?

Answer 8

yes.

Question 9

steps for screen events

Answer 9

1) set up screen
2) set up events and specify functions
3) call listen() and mainloop() functions