1. (More) Basic blocks Broadcasting messages
Lesson 2
(More) Basic blocks
Broadcasting messages

2. Recall… The blocks you’ve learnt in the last lesson: Event blocks
Motion block
Look blocks
Sound blocks

3. Basic blocks Motion block – point towards Control blocks
Sprite pointing towards an object.
Control blocks
FOREVER: The command inside this block will be done forever.
IF: If (something) is correct, then do the followings.

4. Basic blocks Sensing block Looks block Touching something
Change backdrop

5. Broadcasting messages
One sprite broadcasts a message
The other (same) sprite will do the commands after receiving the broadcasted message (e.g. message1).

6. Exercise 2
Your task:
The “Dog” sprite moves “like walking” towards the “Cat” sprite. (Hint: use FOREVER. Choose an appropriate speed(steps).)
Set the starting position of the Dog (initialization).
The “Dog” barks (once) when touching the “Cat”. (Hint: use IF)

7. Exercise 2
The backdrop of the stage changes when the “Dog” touches the “Cat”. (Use broadcast)
The cat ‘meow’s back after the dog barks.
Play background music of your own choice.

8. Exercise 2 Bonus feature:
Create a pause/play button so that you can pause/play when clicked.
Hint:
Pause/play are like on/off. You may need
E.g. (odd no) mod 2 =1
(even no) mod 2 =0