Contents

Contents
Index to programs
Introduction

Programs will run on either Model A or B

1 Graphics Commands

Modes
Pixel sizes
Drawing

Useful commands
Examples

Colours
Changing the palette
Selecting a colour
Moving the origin
Turning off the text cursor
Interlace
Sideways scrolling
Procedures in BASIC

2 Functions and Symmetry

Three ways of drawing a circle

1 Iterative method
2 Polar coordinate method
3 Quadratic solution method

Lissajoux figures
Lissajoux pattern
Ball of wool
Symmetry
Persian Carpet
Multicoloured pattern
Flag
Sketch Pad

3 The Third Dimension

Colours
Polo
Hidden line removal
Perspective
Cubes
Sphere
Planets
Character-defined planets

4 Animation

Redrawing
Kaleidoscope
Palette changes
Flat Spiral
Rotating squares
Multi-coloured spiral
Rotating Fan
Beach balls
Instant plotting
Tumbling box
Condor
Plankton

5 Recursion

Recursive patterns
Recursive procedures
Local variables
Advantages and limitations of recursion
Replacement patterns
Recursive diamonds
Recursive squares
Intelligent parameters
Circles
Recursive calls within a loop
Koch flake
Line replacement patterns
C-Curve
C-CURVE
Dragon Curve
Tree
Ideas that have grown from PROCTREE

6 Pictures

Windy field
Merry-go-round
Rainbow



Desert Island

Appendix A
Index

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