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SpiralWorld: A Programming Exercise Involving SpiralBuggle Objects and Their Positions, Study notes of Computer Science

Wellesley CollegeComputer Science

A programming exercise using spiralworld and spiralbuggle objects. The exercise involves creating two spiralbuggle objects, setting their colors and positions using the spiral method, and then having one object step on the other or change position based on instructions. The exercise is repeated multiple times with different instructions.

Typology: Study notes

Pre 2010

Uploaded on 08/18/2009

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CS111 Computer Programming
Department of Computer Science
Wellesley College
Fruitful methods
Methods that return values
15 September 2006
Methods 4-2
A new twist
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe

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Download SpiralWorld: A Programming Exercise Involving SpiralBuggle Objects and Their Positions and more Study notes Computer Science in PDF only on Docsity!

CS111 Computer Programming

Department of Computer Science

Wellesley College

Fruitful methods

Methods that return values

15 September 2006

Methods 4- 2

A new twist

Methods 4- 3

Boilerplate

public class SpiralWorld extends BuggleWorld

public void run()

SpiralBuggle becky = new SpiralBuggle();

becky.spiral();

return;

class SpiralBuggle extends Buggle

public void spiral()

// our code goes here

Methods 4- 4

Filling the void

public class SpiralWorld extends BuggleWorld

public void run()

// as before

class SpiralBuggle extends Buggle

public void spiral()

this.forward( 6 );

this.left();

this.forward( 6 );

this.left();

this.forward( 6 );

this.left();

this.forward( 2 );

this.left();

this.forward( 2 );

return;

Methods 4- 7

A fruitful method

/* tells the SpiralBuggle to draw a spiral and

to return the SpiralBuggles position after

completing the spiral.

public Point spiral()

this.forward( 6 );

this.left();

this.forward( 6 );

this.left();

this.forward( 6 );

this.left();

this.forward( 2 );

this.left();

this.forward( 2 );

return this.getPosition();

Methods 4- 8

A different twist

Methods 4- 9

More to the point

public class SpiralWorld extends BuggleWorld

public void run()

SpiralBuggle becky = new SpiralBuggle();

SpiralBuggle bobby = new SpiralBuggle();

bobby.setColor(Color.blue);

// our new code goes here

class SpiralBuggle extends Buggle

public Point spiral()

// code from previous page

Methods 4- 10

Shall we dance

public class SpiralWorld extends BuggleWorld

public void run()

SpiralBuggle becky = new SpiralBuggle();

SpiralBuggle bobby = new SpiralBuggle();

bobby.setColor(Color.blue);

// spiral dance steps

bobby.setPosition(becky.spiral());

becky.setPosition(bobby.spiral());

bobby.setPosition(becky.spiral());

becky.setPosition(bobby.spiral());

bobby.setPosition(becky.spiral());

class SpiralBuggle extends Buggle

public Point spiral()

// code from previous page

Methods 4- 13

SpiralWorld SpiralBuggle becky = new SpiralBuggle(); SpiralBuggle bobby = new SpiralBuggle (); bobby.setColor(Color.blue); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); this becky Object Land Execution Land

.run()

bobby bobby steps on becky SpiralBuggle position heading

EAST

color red brushDown true SpiralBuggle position heading

EAST

color red brushDown true

Methods 4- 14

SpiralWorld SpiralBuggle becky = new SpiralBuggle(); SpiralBuggle bobby = new SpiralBuggle (); bobby.setColor(Color.blue); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); this becky Object Land Execution Land

.run()

bobby bobby is blue SpiralBuggle position heading

EAST

color red brushDown true SpiralBuggle position heading

EAST

color blue brushDown true

Methods 4- 15

SpiralWorld SpiralBuggle becky = new SpiralBuggle(); SpiralBuggle bobby = new SpiralBuggle (); bobby.setColor(Color.blue); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); this becky Object Land Execution Land

.run()

bobby becky spirals SpiralBuggle position heading

EAST

color red brushDown true SpiralBuggle position heading

EAST

color blue brushDown true this.forward( 6 ); this.left(); this.forward( 6 ); this.left(); this.forward( 6 ) this.left(); this.forward( 2 ); this.left(); this.forward( 2 ) return this.getPosition(); this

.spiral()

Methods 4- 16

SpiralWorld SpiralBuggle becky = new SpiralBuggle(); SpiralBuggle bobby = new SpiralBuggle (); bobby.setColor(Color.blue); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); this becky Object Land Execution Land

.run()

bobby You put your right foot in SpiralBuggle position heading

EAST

color red brushDown true SpiralBuggle position heading

EAST

color blue brushDown true this.forward( 6 ); this.left(); this.forward( 6 ); this.left(); this.forward( 6 ) this.left(); this.forward( 2 ); this.left(); this.forward( 2 ) return this.getPosition(); this

.spiral()

Methods 4- 19

SpiralWorld SpiralBuggle becky = new SpiralBuggle(); SpiralBuggle bobby = new SpiralBuggle (); bobby.setColor(Color.blue); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); this becky Object Land Execution Land

.run()

bobby And you shake it all about SpiralBuggle position heading

WEST

color red brushDown true SpiralBuggle position heading

EAST

color blue brushDown true this.forward( 6 ); this.left(); this.forward( 6 ); this.left(); this.forward( 6 ) this.left(); this.forward( 2 ); this.left(); this.forward( 2 ) return this.getPosition(); this

.spiral()

Methods 4- 20

SpiralWorld SpiralBuggle becky = new SpiralBuggle(); SpiralBuggle bobby = new SpiralBuggle (); bobby.setColor(Color.blue); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); this becky Object Land Execution Land

.run()

bobby You do the the hokie pokie SpiralBuggle position heading

WEST

color red brushDown true SpiralBuggle position heading

EAST

color blue brushDown true this.forward( 6 ); this.left(); this.forward( 6 ); this.left(); this.forward( 6 ) this.left(); this.forward( 2 ); this.left(); this.forward( 2 ) return this.getPosition(); this

.spiral()

Methods 4- 21

SpiralWorld SpiralBuggle becky = new SpiralBuggle(); SpiralBuggle bobby = new SpiralBuggle (); bobby.setColor(Color.blue); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); this becky Object Land Execution Land

.run()

bobby And that’s what its all about SpiralBuggle position heading

SOUTH color red brushDown true SpiralBuggle position heading

EAST

color blue brushDown true this.forward( 6 ); this.left(); this.forward( 6 ); this.left(); this.forward( 6 ) this.left(); this.forward( 2 ); this.left(); this.forward( 2 ) return this.getPosition(); this

.spiral()

Methods 4- 22

SpiralWorld SpiralBuggle becky = new SpiralBuggle(); SpiralBuggle bobby = new SpiralBuggle (); bobby.setColor(Color.blue); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); this becky Object Land Execution Land

.run()

bobby You put your left foot in SpiralBuggle position heading

SOUTH color red brushDown true SpiralBuggle position heading

EAST

color blue brushDown true this.forward( 6 ); this.left(); this.forward( 6 ); this.left(); this.forward( 6 ) this.left(); this.forward( 2 ); this.left(); this.forward( 2 ) return this.getPosition(); this

.spiral()

Methods 4- 25

SpiralWorld SpiralBuggle becky = new SpiralBuggle(); SpiralBuggle bobby = new SpiralBuggle (); bobby.setColor(Color.blue); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); this becky Object Land Execution Land

.run()

bobby And you shake it all about SpiralBuggle position heading

EAST

color red brushDown true SpiralBuggle position heading

EAST

color blue brushDown true this.forward( 6 ); this.left(); this.forward( 6 ); this.left(); this.forward( 6 ) this.left(); this.forward( 2 ); this.left(); this.forward( 2 ) return this.getPosition(); this

.spiral() x

y

Point

Methods 4- 26

SpiralWorld SpiralBuggle becky = new SpiralBuggle(); SpiralBuggle bobby = new SpiralBuggle (); bobby.setColor(Color.blue); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); this becky Object Land Execution Land

.run()

bobby bobby steps on becky, again SpiralBuggle position heading

EAST

color red brushDown true SpiralBuggle position heading

EAST

color blue brushDown true x y

Point

Methods 4- 27

SpiralWorld SpiralBuggle becky = new SpiralBuggle(); SpiralBuggle bobby = new SpiralBuggle (); bobby.setColor(Color.blue); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); this becky Object Land Execution Land

.run()

bobby bobby turn to dance SpiralBuggle position heading

EAST

color red brushDown true SpiralBuggle position heading

EAST

color blue brushDown true this.forward( 6 ); this.left(); this.forward( 6 ); this.left(); this.forward( 6 ) this.left(); this.forward( 2 ); this.left(); this.forward( 2 ) return this.getPosition(); this

.spiral()

Methods 4- 28

SpiralWorld SpiralBuggle becky = new SpiralBuggle(); SpiralBuggle bobby = new SpiralBuggle (); bobby.setColor(Color.blue); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); becky.setPosition(bobby.spiral()); bobby.setPosition(becky.spiral()); this becky Object Land Execution Land

.run()

bobby You put your left foot in SpiralBuggle position heading

EAST

color red brushDown true SpiralBuggle position heading

EAST

color blue brushDown true this.forward( 6 ); this.left(); this.forward( 6 ); this.left(); this.forward( 6 ) this.left(); this.forward( 2 ); this.left(); this.forward( 2 ) return this.getPosition(); this

.spiral()