TIFFANY HOLMES>BREAKOUT GAME>SPRING04>HANDOUT CLASS 5

EVENTS>Examples of event handlers>You want to initialize all your variables in your global script with the event: on startmovie.

on startmovie me

--in the startmovie event all global variables get initialized

global gball, gbricks, gx, gy

--gball is sprite channel number for ball

gball=20

--there are fifteen bricks in channels 1-15

gbricks=15

--gx and gy help change the direction of the ball (see ballbounce script in movie breakout_sample_intersects.dir in the Class 5 folder on the Files for Courses server.)

gx=1

gy=1

end

COMMANDS WITH REPEAT LOOPS: Sometimes you want to command a change to a large group of sprites. This is where repeat loops come in handy. Here’s an example of a loop that tests to see whether the ball sprite (me.spritenum) hits any of the sprites in channels 1-15. If there is a hit the brick moves off screen and a sound called “cherry” is played in channel 2.

repeat with b=1 to 15

if sprite(me.spritenum).intersects(b) then

sprite(b).loc=point(-100,-100)

puppetsound 2, "cherry"

end if

end repeat

HELPFUL LIST SYNTAX (linear lists only)

Setting up a blank, or empty list:

Gbrickshit=[]

Adding an element to a list:

Append Gbrickshit=[6]

Getting the count of a list:

Put count(Gbrickshit) into field “data