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Index

AND  9, 54 
animation 4l 
	ellipse 43
	instant plotting 53
	memory requirement 41
	palette changes 7,42,43, 47, 51, 53
	redrawing 41 	
	rotating objects 43
	rotation and reflection 42

scrolling l0, 87, 89

	successive views 60
	tumbling box 55
	vertical sync 43


ball of wool  18
beach balls  51
box  55


C-curve  77
carpet  19
character definition  36
circle drawing
	iterative method  13
	polar-coordinate method   14, 16
	quadratic solution method  14
circles (pattern)  72
circles (squashed)  30, 94, 102
clouds  90
colours  6
	logical and physical  6
	intensity of colour  35
commands  4,5
condor  57
coordinates  3
cubes
	advancing cubes  31
	perspective view  31
	tumbling box  55
cursor
	graphics  4, 9
	text  9



diamonds (recursive)  67
dragon curve  80
DRAW commands  5
drawing  4, 23, 56


ellipse 14,43,52,53
Exclusive-OR (EOR) 9,19


fan 48
field 87
flag 22, 96
functions 4
	SIN and COS 18


GCOL 8, 19
graphics commands 4
graphics cursor 4
grass 99


high resolution 3
horse 96


INKEY 24
instant plotting 53,55
interlace 9
introduction 1
island  100 ,102


kaleidoscope 41
Koch flake 75


Lissajoux figures 15-17
Lissajoux pattern 17
local variables 65


memory 3, 41, 66
merry-go-round 93
MODE 3,4
	4-colour 6
	l6-colour 6
Moire pattern 20
mountains 27


obscured objects 26
OR 8, 53, 54
origin, moving the 9,20
over-plotting 27


palette 6
	changes 7
	(see also 'animation')
palm tree 103
parameters 10,11
	actual 11
	formal 11
	intelligent 71
pattern 21
perspective 29££
	view of fan 48
	view of base 94
pixel 3 ,4
planets 35££
PLOT commands 5
polo 25
procedures


rainbow 97
random dots
random walk
rapid drawing 36
rapid filling 27
rectangular fill
recursion 63££
	asymmetric £33
	depth of 65, 83
	intelligent parameters 71
recursive calls 66, 74
	diamonds 67
	patterns 63
	procedures 64
	squares 69
redrawing 41
reflection 19,42
replacement pattern 66,76
replacement rule 63
resolution 1, 3
rotating objects
beach balls 51
fan 48
spiral 43, 46
squares 45
rotation 42


scrolling
	sideways 10
	vertical 87,89
sea 101
sine waves
sketch pad
sky 100
sphere 33
spiral 43, 46
squares 45
sun 92
surf 104
symmetry 19 ,22
synchronisation 43


text cursor 9
three-dimensional 25ff
	converging lines 30,90,99
	dot shading 35,99
	hidden line removal (overplotting) 26,27
	impression of depth 25,26,30,52,90,102
	squashed circles 30,94,10
tree 83 ,103
triangle fill 5,81,100
tumbling box 55


variables 4
	boolean 92, 96
	control 74
	local 65

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