Create a movie that has two filled rectangles that move by a random amount in x and y (< 5 pixels) each time. Make sure that they don’t go outside the picture.

Question

What will be an ideal response?

Answer 1

```
/? ?
? Method t o r e t u r n a random amount added t o i < 5 b u t
? c h e c k i n g n o t t o e x c e e d t h e g i v e n max
? @param i t h e c u r r e n t v a l u e
? @param max t h e max f o r t h i s d i r e c t i o n ( x or y )
? @return i + some random amount < 5
?/
private i n t getRandomExtra ( in t i , i n t max)
{
i n t v a l u e = i + randNumGen . n e x t I n t ( 5 ) ;
i f ( v a l u e > max)
v a l u e = max ? 5 ;
return v a l u e ;
}
/? ?
? Method t o make a movie t h a t has a two r e c t a n g l e s moving
? around by a d d i n g a random amount l e s s tha n 5 p i x e l s
? @param d i r e c t o r y t h e d i r e c t o r y t o p u t t h e movie
? frames
?/
public void makeTwoRectangleRandMovie ( S t r i n g d i r e c t o r y )
{
int framesPerSec = 3 0 ;
P i c t u r e p = null ;
G r a p h i c s g = null ;
FrameSequencer f r a m e S e q u e n c e r =
new FrameSequencer ( d i r e c t o r y ) ;
// l o o p t h r o u g h t h e f i r s t s e c o n d
f o r ( i n t i = 0 ; i < f r a m e s P e r S e c ; i ++)
{
// draw a f i l l e d r e c t a n g l e
p = new P i c t u r e ( 6 4 0 , 4 8 0 ) ;
g = p . getGraphics ( ) ;
g . s e t C o l o r ( C o l o r .RED) ;
g . f i l l R e c t ( getRandomExtra ( i , 6 3 9 ) ,
getRandomExtra ( i , 4 7 9 )
,50 ,50);
g . s e t C o l o r ( C o l o r .BLUE ) ;
g . f i l l R e c t ( getRandomExtra ( i + 1 0 0 , 6 3 9 ) ,
getRandomExtra ( i , 4 7 9 ) ,
50 ,50);

// add frame t o s e q u e n c e r
f r a m e S e q u e n c e r . addFrame ( p ) ;
}
// p l a y t h e movie
frameSequencer . play ( framesPerSec ) ;
}

```