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initial commit.

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Manuel Friedli 2020-09-30 01:22:26 +02:00
parent 817cfbe4f3
commit f31821f100
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.gitignore vendored Normal file
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.idea/
### Maven template
target/
pom.xml.tag
pom.xml.releaseBackup
pom.xml.versionsBackup
pom.xml.next
release.properties
dependency-reduced-pom.xml
buildNumber.properties
.mvn/timing.properties
# https://github.com/takari/maven-wrapper#usage-without-binary-jar
.mvn/wrapper/maven-wrapper.jar

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pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>ch.fritteli</groupId>
<artifactId>fritteli-build-parent</artifactId>
<version>2.0.3</version>
</parent>
<groupId>org.example</groupId>
<artifactId>labyrinth</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>org.jetbrains</groupId>
<artifactId>annotations</artifactId>
</dependency>
<dependency>
<groupId>io.vavr</groupId>
<artifactId>vavr</artifactId>
</dependency>
</dependencies>
</project>

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src/main/java/labyrinth/Direction.java Normal file
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package labyrinth;
import io.vavr.collection.Stream;
import io.vavr.control.Option;
import lombok.NonNull;
import java.util.EnumSet;
import java.util.Random;
import java.util.function.UnaryOperator;
public enum Direction {
TOP(position -> position.withY(position.getY() - 1)),
BOTTOM(position -> position.withY(position.getY() + 1)),
LEFT(position -> position.withX(position.getX() - 1)),
RIGHT(position -> position.withX(position.getX() + 1));
private static final Random random = new Random();
@NonNull
private final UnaryOperator<Position> translation;
Direction(@NonNull final UnaryOperator<Position> translation) {
this.translation = translation;
}
public static Direction getRandom() {
return values()[random.nextInt(4)];
}
public static Option<Direction> getRandomExcluding(@NonNull final EnumSet<Direction> directions) {
final EnumSet<Direction> allowedDirections = EnumSet.complementOf(directions);
return Stream.ofAll(allowedDirections).shuffle().headOption();
}
public static Option<Direction> getRandomExcluding(@NonNull final Direction... directions) {
return Stream.of(values())
.removeAll(Stream.of(directions))
.shuffle()
.headOption();
}
public Direction getOpposite() {
switch (this) {
case TOP:
return BOTTOM;
case LEFT:
return RIGHT;
case RIGHT:
return LEFT;
case BOTTOM:
return TOP;
}
throw new IllegalStateException("Programming error: Not all enum values covered in enum Direction#getOpposite()!");
}
public Position translate(@NonNull final Position position) {
return this.translation.apply(position);
}
}

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src/main/java/labyrinth/Directions.java Normal file
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package labyrinth;
import io.vavr.collection.Stream;
import lombok.Getter;
import lombok.NonNull;
import java.util.EnumSet;
import java.util.HashSet;
import java.util.Set;
public class Directions {
private final Set<Direction> directions = new HashSet<>();
// FIXME remove getter, only for debugging
@Getter
private final Set<Direction> hardened = new HashSet<>();
public boolean set(@NonNull final Direction direction) {
return this.directions.add(direction);
}
public void setAll() {
this.directions.addAll(EnumSet.allOf(Direction.class));
}
public boolean clear(@NonNull final Direction direction) {
if (this.hardened.contains(direction)) {
return false;
}
return this.directions.remove(direction);
}
public void clearAll() {
this.directions.clear();
this.directions.addAll(this.hardened);
}
public boolean isSet(@NonNull final Direction direction) {
return this.directions.contains(direction);
}
public Iterable<Direction> getSet() {
return this.getSet(false);
}
public Iterable<Direction> getSet(final boolean onlyBrittleWalls) {
if (onlyBrittleWalls) {
return Stream.ofAll(this.directions)
.removeAll(this.hardened);
}
return Stream.ofAll(this.directions);
}
public void harden(@NonNull final Direction direction) {
if (!this.directions.contains(direction)) {
throw new IllegalStateException("Trying to harden cleared Direction: " + direction);
}
this.hardened.add(direction);
}
public void unharden(@NonNull final Direction direction) {
this.hardened.remove(direction);
}
}

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src/main/java/labyrinth/Labyrinth.java Normal file
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package labyrinth;
import io.vavr.control.Option;
import lombok.NonNull;
import java.util.Deque;
import java.util.LinkedList;
public class Labyrinth {
private final Tile[][] field;
private final int width;
private final int height;
public Labyrinth(final int width, final int height) {
this.width = width;
this.height = height;
this.field = new Tile[width][height];
this.initField();
System.out.println(this);
this.generate();
}
private static final char TOP_LEFT = '\u250c';
private static final char TOP_RIGHT = '\u2510';
private static final char MIDDLE_LEFT = '\u251c';
private static final char MIDDLE_RIGHT = '\u2524';
private static final char BOTTOM_LEFT = '\u2514';
private static final char BOTTOM_RIGHT = '\u2518';
private static final char HORIZONTAL = '\u2500';
private static final char VERTICAL = '\u2502';
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
for (int y = 0; y < this.height; y++) {
// TOP WALL
for (int x = 0; x < this.width; x++) {
final Tile tile = this.getTileAt(new Position(x, y));
final boolean top = tile.getWalls().isSet(Direction.TOP);
final boolean topHard = tile.getWalls().getHardened().contains(Direction.TOP);
sb.append(TOP_LEFT);
if (topHard) {
if (top) {
sb.append(HORIZONTAL);
} else {
sb.append("?");
}
} else {
if (top) {
sb.append("-");
} else {
sb.append(" ");
}
}
sb.append(TOP_RIGHT);
}
sb.append("\n");
// LEFT WALL, CENTER, RIGHT WALL
for (int x = 0; x < this.width; x++) {
final Tile tile = this.getTileAt(new Position(x, y));
// left
final boolean left = tile.getWalls().isSet(Direction.LEFT);
final boolean leftHard = tile.getWalls().getHardened().contains(Direction.LEFT);
if (leftHard) {
if (left) {
sb.append(VERTICAL);
} else {
sb.append("?");
}
} else {
if (left) {
sb.append(":");
} else {
sb.append(" ");
}
}
// center
sb.append(" ");
// right
final boolean right = tile.getWalls().isSet(Direction.RIGHT);
final boolean rightHard = tile.getWalls().getHardened().contains(Direction.RIGHT);
if (rightHard) {
if (right) {
sb.append(VERTICAL);
} else {
sb.append("?");
}
} else {
if (right) {
sb.append(":");
} else {
sb.append(" ");
}
}
}
sb.append("\n");
// BOTTOM WALL
for (int x = 0; x < this.width; x++) {
final Tile tile = this.getTileAt(new Position(x, y));
final boolean bottom = tile.getWalls().isSet(Direction.BOTTOM);
final boolean bottomHard = tile.getWalls().getHardened().contains(Direction.BOTTOM);
sb.append(BOTTOM_LEFT);
if (bottomHard) {
if (bottom) {
sb.append(HORIZONTAL);
} else {
sb.append("?");
}
} else {
if (bottom) {
sb.append("-");
} else {
sb.append(" ");
}
}
sb.append(BOTTOM_RIGHT);
}
sb.append("\n");
}
return sb.toString();
}
private Tile getTileAt(@NonNull final Position position) {
return this.field[position.getX()][position.getY()];
}
private void initField() {
for (int x = 0; x < this.width; x++) {
this.field[x] = new Tile[this.height];
for (int y = 0; y < this.height; y++) {
final Tile tile = new Tile();
this.hardenWalls(tile, x, y);
this.field[x][y] = tile;
}
}
}
private void hardenWalls(@NonNull final Tile tile, final int x, final int y) {
if (x == 0) {
tile.preventDiggingToOrFrom(Direction.LEFT);
} else if (x == width - 1) {
tile.preventDiggingToOrFrom(Direction.RIGHT);
}
if (y == 0) {
if (x != 0) {
tile.preventDiggingToOrFrom(Direction.TOP);
}
} else if (y == height - 1) {
tile.preventDiggingToOrFrom(Direction.BOTTOM);
}
}
private void generate() {
new Generator();
}
public class Generator {
private final Deque<Position> positions = new LinkedList<>();
Generator() {
final Position topLeft = new Position(0, 0);
Labyrinth.this.getTileAt(topLeft).digFrom(Direction.TOP);
this.positions.push(topLeft);
this.dig();
final Position bottomRight = new Position(Labyrinth.this.width - 1, Labyrinth.this.height - 1);
final Tile bottomRightTile = Labyrinth.this.getTileAt(bottomRight);
bottomRightTile.enableDiggingToOrFrom(Direction.BOTTOM);
bottomRightTile.digTo(Direction.BOTTOM);
}
private void dig() {
while (!this.positions.isEmpty()) {
final Position currentPosition = this.positions.peek();
final Tile currentTile = Labyrinth.this.getTileAt(currentPosition);
final Option<Direction> directionToDigTo = currentTile.getRandomAvailableDirection();
if (directionToDigTo.isDefined()) {
final Direction digTo = directionToDigTo.get();
final Direction digFrom = digTo.getOpposite();
final Position neighborPosition = digTo.translate(currentPosition);
final Tile neighborTile = Labyrinth.this.getTileAt(neighborPosition);
if (currentTile.digTo(digTo) && neighborTile.digFrom(digFrom)) {
// all ok!
this.positions.push(neighborPosition);
} else {
// Hm, didn't work.
currentTile.undigTo(digTo);
currentTile.preventDiggingToOrFrom(digTo);
}
} else {
this.positions.pop();
}
}
}
}
}

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src/main/java/labyrinth/Main.java Normal file
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package labyrinth;
import lombok.NonNull;
public class Main {
public static void main(@NonNull final String[] args) {
int width = 5;
int height = 8;
final Labyrinth labyrinth = new Labyrinth(width, height);
System.out.println(labyrinth);
}
}

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src/main/java/labyrinth/Position.java Normal file
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package labyrinth;
import lombok.Value;
import lombok.With;
@Value
@With
public class Position {
int x;
int y;
}

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src/main/java/labyrinth/Tile.java Normal file
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package labyrinth;
import io.vavr.collection.Stream;
import io.vavr.control.Option;
import lombok.AccessLevel;
import lombok.Getter;
import lombok.NonNull;
import lombok.experimental.FieldDefaults;
@FieldDefaults(level = AccessLevel.PRIVATE)
public class Tile {
// FIXME remove me; only for debugging
@Getter
final Directions walls = new Directions();
@Getter
boolean visited = false;
public Tile() {
this.walls.setAll();
}
public void preventDiggingToOrFrom(@NonNull final Direction direction) {
this.walls.harden(direction);
}
public void enableDiggingToOrFrom(@NonNull final Direction direction) {
this.walls.unharden(direction);
}
public boolean digFrom(@NonNull final Direction direction) {
if (this.visited) {
return false;
}
this.visited = true;
return this.walls.clear(direction);
}
public boolean digTo(@NonNull final Direction direction) {
return this.walls.clear(direction);
}
public void undigTo(@NonNull final Direction direction) {
this.walls.set(direction);
}
public Option<Direction> getRandomAvailableDirection() {
return Stream.ofAll(this.walls.getSet(true)).shuffle().headOption();
}
}