ANIMATION
AmigaBasic supports two types of objects that can be animated. these are
bobs and sprites. They each have different characteristics and have their
own advantages and disadvantages.

BOBS
Bobs are slower moving than sprites, but can be larger and have more
colours.

q
10110
QUIZ ON BOBS
Type 1 for true, type 0 for false
(1) Bobs can be larger than sprites
(2) Bobs can be faster than sprites
(3) Bobs can be drawn with the Objeditor
(4) Bobs have less colours than sprites
(5) Bobs cannot be animated

SPRITES
Sprites can be faster moving than bobs, but have a limited size and number
of colours.

q
01101
QUIZ ON SPRITES
Type 1 for true, type 0 for false
(1) Sprites canbe larger than bobs
(2) Sprites can be faster than bobs
(3) Sprites can be drawn with the ObjEdit
(4) Sprites cannot be animated
(5) Sprites have less colours than bobs

OBJECT.SHAPE
This command gives all the details of an object whether it is a sprite or
bob.
The information is a definition string which can be read from a sequential
file by the INPUT$ command.
This command can be used to use identical objects.

q
11011
QUIZ ON OBJECT.SHAPE
Type 1 for true, type 0 for false
(1) An object is stored as a sequential file
(2) This file can be read with an INPUT$ statement
(3) OBJECT.SHAPE can only create one object
(4) OBJECT.SHAPE determines the colour, size and shape
(5) You can use it to create several identical objects

OBJECT.START
OBJECT.STOP
 
The first command starts an objects movement
The second command makes it stop moving

OBJECT ON
activates the object

OBJECT OFF
removes all objects from the screen

OBJECT.CLOSE
Removes an object from memory
If no number is given, all objects in the current window will be erased

OBJECT.PRIORITY
Setting priority will determine which object will be visible when several
items are overlapping or occupying the same place.
The higher valued object will be displayed in front.

q
11110
QUIZ ON OBJECT START/STOP ON/OFF
Type 1 for true, type 0 for false
(1) OBJECT ON activates an object
(2) OBJECT ON without a number activates all objects
(3) OBJECT START starts movement
(4) OBJECT OFF removes all objects from the screen
(5) OBJECT STOP  removes an object from the screen

OBJECT.AX
OBJECT.AY
Sets the aceleration for an object

OBJECT.VX
OBJECT.VY
Sets the speed(velocity) of moving objects
vx is the horizontal speed
and vy is the vertical speed
They can be used to tell you the present speed of an object
e.g.
x=OBJECT.VX(2)
gives the horizontal speed of object 2

q
00010
QUIZ ON OBJECT SPEED
Type 1 for true, type 0 for false
(1) You cannot find the speed of an object
(2) The vertical aceleration is ax
(3) The vertical speed is ay
(4) The horizontal speed is ax
(5) The vertical speed is vy

OBJECT.X
OBJECT.Y
Sets starting point and/or position of an object's movement
shows the present location of an object

OBJECT.CLIP
This causes movement to occur only within a given rectangle
e.g.OBJECT.CLIP (x1,y1)-(x2,y2)

q
10010
QUIZ ON OBJECT LOCATION
Type 1 for true, type 0 for false
(1) OBJECT.X sets the starting x-co-ordinate
(2) OBJECT.Y sets the starting x-co-ordinate
(3) OBJECT.X and OBJECT.Y make the object visible
(4) OBJECT.CLIP will mean an object will move in a rectangle
(5) OBJECT.CLIP means the object will only move in one window

COLLISION
e.g.x=collision(2)
1=upper border,2=left border
3=lower border,4=right border
This shows what border the object has hit

COLLISION(0)
which number object collided
COLLISION(-1)
tells you which window it was in

COLLISION ON
COLLISION OFF
COLLISION STOP
event trapping for collisions
ON COLLISION GOSUB

q
11001
QUIZ ON COLLISION
Type 1 for true, type 0 for false
(1) COLLISION can detect whether any border is hit
(2) The maximum number of collisions is 16
(3) The value of COLLISION(0) tells which window
(4) The value of COLLISION(-1) gives the object number
(5) COLLISION is a form of event trapping

DRAWING OBJECTS
Objects can be created in different ways. One way is to use the Object
Editor which is on the EXTRAS disk. This utility allows to create your own
bobs and sprites.