Lots of stuff.

.gitignore

@@ -0,0 +1,6 @@
+# Builds
+build/
+
+# Player and world data
+player.dat
+world.dat

Makefile

@@ -1,7 +1,11 @@
 all:
 	mkdir -p ./build/mc4k/
 	mkdir -p ./build/res/
+	javac -d ./build/ ./mc4k/MCApplet.java
+	javac -d ./build/ ./mc4k/MCTerrainGenerator.java
+	javac -d ./build/ ./mc4k/MCPlayer.java
 	javac -d ./build/ ./mc4k/Minecraft4K.java
 	cp ./res/Manifest.txt ./build/
 	cp ./res/textures.dat ./build/res/
+	cp ./res/icon.png ./build/res/
 	cd build && jar cfm Minecraft4K.jar Manifest.txt mc4k/* res/*

README.md

@@ -2,6 +2,11 @@
 
 Minecraft 4K, but fixed.
 
+![screenshot](https://raw.githubusercontent.com/Alvarito050506/mc4k/master/screenshot.png)
+
+## Requirements
+To run this, you will need the Java Runtime Environment (JRE) `>= 8.0`, to build this you will need the Java Development Kit (JDK) `>= 8.0`. Both Oracle and OpenJDK versions of the programs were tested and work correctly.
+
 ## Building and usage
 To build this, do:
 ```sh
@@ -31,8 +36,24 @@ java -jar ./build/Minecraft4K.jar
  + Save world: `'G'`
  + Load world: `'C'`
  + Quit: `Esc`
+ + Screenshot: `F2`
+
+## Changes
+ + Ported the code from a Java Applet to a Java application.
+ + Modified controls to not depend on the keypad.
+ + Added a better world saving and loading system.
+ + Added a player data saving and loading system.
+ + Added a diamond counter, and removed it from the default "inventory".
+ + Added world generation.
+ + Packed the program in a single JAR.
+ + Modified the code internally, to make it more friendly.
+ + Made small changes and fixes to the way the GUI works and looks.
+ + Added automatic world and player data saving on exit.
+ + Added screenshot feature.
+
+Both player and world data, and screenshots, are saved to the current directory.
 
 ## Credits and licensing
 I don't even know from where the original code comes, but I downloaded it from a [post](https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/1290821-minecraft-4k-improved-by-crunchycat-download-now?comment=60) in the MCForums. It looks like it was a modified version of the original reverse-engineered Minecraft 4K code.
 
-All my modifications were made for the only purpose of making it more playable, feel free to modify and distribute them.
+All my modifications were made for the only purpose of making it more enjoyable, feel free to modify and distribute them.

mc4k/MCApplet.java

@@ -0,0 +1,145 @@
+/*
+ * MCApplet.java - Helper class.
+ * 
+ * Copyright 2021 Alvarito050506 <donfrutosgomez@gmail.com>
+ * 
+ */
+
+package mc4k;
+
+import java.awt.Panel;
+import java.awt.Frame;
+import java.awt.event.KeyEvent;
+import java.awt.event.KeyListener;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+import java.awt.event.MouseMotionListener;
+import java.awt.image.BufferedImage;
+import java.awt.image.DataBufferInt;
+import java.awt.image.ImageObserver;
+
+class MCEvents {
+	public int mouseX = 0;
+	public int mouseY = 0;
+	public int[] wasd = new int[4]; // WASD
+	public int[] buttons = new int[2]; // Left, Right
+	public int[] arrows = new int[2]; // Left, Right
+	public int[] worldKeys = new int[4]; // Esc, C, G, F2
+	public int space = 0; // Space
+	public int mouseLocked = 1; // 0: Locked, 1: Game not started, 2: Focus lost
+}
+
+public class MCApplet extends Panel implements MouseMotionListener, MouseListener, KeyListener {
+	public MCEvents events = new MCEvents();
+	public static Frame frame = new Frame();
+
+	@Override
+	public void mouseDragged(MouseEvent paramEvent) {
+		if (events.mouseLocked != 0)
+		{
+			return;
+		}
+		events.mouseX = paramEvent.getX();
+		events.mouseY = paramEvent.getY();
+	}
+
+	@Override
+	public void mouseMoved(MouseEvent paramEvent) {
+		if (events.mouseLocked != 0)
+		{
+			return;
+		}
+		events.mouseX = paramEvent.getX();
+		events.mouseY = paramEvent.getY();
+	}
+
+	@Override
+	public void mousePressed(MouseEvent paramEvent) {
+		if (events.mouseLocked != 0)
+		{
+			return;
+		}
+		events.mouseX = paramEvent.getX();
+		events.mouseY = paramEvent.getY();
+		if ((paramEvent.getModifiers() & 4) <= 0)
+			events.buttons[0] = 1;
+		else
+			events.buttons[1] = 1;
+	}
+
+	private void setKeyEvent(KeyEvent paramEvent, int val) {
+		switch (paramEvent.getKeyCode()) {
+			case 27:
+				events.worldKeys[0] = val;
+			break;
+			case 67:
+				events.worldKeys[1] = val;
+			break;
+			case 71:
+				events.worldKeys[2] = val;
+			break;
+			case 113:
+				events.worldKeys[3] = val;
+			break;
+			case 37:
+				events.arrows[0] = val;
+			break;
+			case 39:
+				events.arrows[1] = val;
+			break;
+			case 87:
+				events.wasd[0] = val;
+			break;
+			case 65:
+				events.wasd[1] = val;
+			break;
+			case 83:
+				events.wasd[2] = val;
+			break;
+			case 68:
+				events.wasd[3] = val;
+			break;
+			case 32:
+				events.space = val;
+			break;
+		}
+	}
+
+	@Override
+	public void keyPressed(KeyEvent paramEvent) {
+		setKeyEvent(paramEvent, 1);
+	}
+
+	@Override
+	public void keyReleased(KeyEvent paramEvent) {
+		setKeyEvent(paramEvent, 0);
+	}
+
+	@Override
+	public void mouseExited(MouseEvent paramEvent) {
+		return;
+	}
+
+	@Override
+	public void mouseClicked(MouseEvent paramEvent) {
+		if (events.mouseLocked == 1) {
+			events.mouseLocked = 0;
+		}
+		return;
+	}
+
+	@Override
+	public void mouseEntered(MouseEvent paramEvent) {
+		return;
+	}
+
+	@Override
+	public void mouseReleased(MouseEvent paramEvent) {
+		return;
+	}
+
+	@Override
+	public void keyTyped(KeyEvent paramEvent) {
+		return;
+	}
+}

mc4k/MCPlayer.java

@@ -0,0 +1,23 @@
+/*
+ * MCPlayer.java - Player inventory and data.
+ * 
+ * Copyright 2021 Alvarito050506 <donfrutosgomez@gmail.com>
+ * 
+ */
+
+package mc4k;
+
+import java.util.Random;
+import java.time.Instant;
+import java.lang.Math;
+import java.io.Serializable;
+
+public class MCPlayer implements Serializable {
+	private static final long serialVersionUID = 1L;
+
+	public int blockInHand = 1;
+	public int diamondCounter = 0;
+	public float posX = 96.5F;
+	public float posY = 95.0F;
+	public float posZ = 96.5F;
+}

mc4k/MCTerrainGenerator.java

@@ -0,0 +1,140 @@
+/*
+ * MCTerrainGenerator.java - Terrain generator.
+ * 
+ * Copyright 2021 Alvarito050506 <donfrutosgomez@gmail.com>
+ * Copyright 2020 @saca44 at the MCForums
+ * 
+ */
+
+package mc4k;
+
+import java.util.Random;
+import java.time.Instant;
+import java.lang.Math;
+
+public class MCTerrainGenerator {
+	Random random = new Random();
+	int seed = 0;
+	int worldSize = 64 * 64 * 64;
+	int[] worldBlocks = new int[worldSize];
+	double[][] heightMap = new double[64][64];
+
+	public MCTerrainGenerator() {
+		int i = 0;
+		int tbsi;
+		int randomMax = (int)Math.pow(64, 4);
+
+		float fx = 0;
+		float fy = 0;
+
+		random.setSeed(Instant.now().getEpochSecond());
+		for (int y = 0; y < 64; y++) {
+			fx = 0;
+			for (int x = 0; x < 64; x++) {
+				heightMap[x][y] = 32 + (Math.cos(fx) + Math.sin(fy)) * 2;
+				fx += 0.2f;
+			}
+			fy += 0.2f;
+		}
+
+		for (int y = 0; y < 64; y++) {
+			for (int x = 0; x < 64; x++) {
+				for (int z = 0; z < 64; z++) {
+					int lim = i / 64 % 64;
+					double mapVal = heightMap[y][z];
+					if (heightMap[y][z] > lim) {
+						worldBlocks[i] = 0;
+					} else if (mapVal > lim - 1) {
+						worldBlocks[i] = 1;
+					} else if (mapVal > lim - 4 + random.nextFloat()) {
+						worldBlocks[i] = 2;
+					} else {
+						if (random.nextInt(randomMax) >= randomMax - randomMax / 128) {
+							worldBlocks[i] = 3;
+						} else {
+							worldBlocks[i] = 4;
+						}
+					}
+					i++;
+				}
+			}
+		}
+
+		for (int x = 0; x < 64; x++) {
+			for (int z = 0; z < 64; z++) {
+				tbsi = vecToInt(x, (int)(heightMap[x][z]), z);
+				if (isTreeAreaBlank(x, (int)(heightMap[x][z]), z) > 0) {
+					if (random.nextInt(96) == 0) {
+						tree(x, (int)(heightMap[x][z]), z);
+					}
+				}
+			}
+		}
+	}
+
+	public int vecToInt(int x, int y, int z) {
+		return z + y * 64 + x * 4096;
+	}
+
+	public void setBlock(int block, int x, int y, int z) {
+		int coords = vecToInt(x, y, z);
+		if (coords > 0 && coords < worldSize) {
+			worldBlocks[coords] = block;
+		}
+	}
+
+	public void fillBlocks(int block, int x, int y, int z, int w, int h, int d) {
+		w += x;
+		h += y;
+		d += z;
+		for (int xx = x; xx < w; xx++) {
+			for (int yy = y; yy < h; yy++) {
+				for (int zz = z; zz < d; zz++) {
+					setBlock(block, xx, yy, zz);
+				}
+			}
+		}
+	}
+
+	public int isTreeAreaBlank(int x, int y, int z) {
+		int coords;
+
+		try {
+			coords = vecToInt(x, (int)(heightMap[x][z]), z);
+			if (worldBlocks[coords] != 0)
+			{
+				return 0;
+			}
+			coords = vecToInt(x + 1, (int)(heightMap[x][z]), z);
+			if (worldBlocks[coords] != 0)
+			{
+				return 0;
+			}
+			coords = vecToInt(x + 1, (int)(heightMap[x][z]), z + 1);
+			if (worldBlocks[coords] != 0)
+			{
+				return 0;
+			}
+			coords = vecToInt(x, (int)(heightMap[x][z]), z + 1);
+			if (worldBlocks[coords] != 0)
+			{
+				return 0;
+			}
+		} catch (Exception err) {
+			return 0;
+		}
+		return 1;
+	}
+
+	public void tree(int x, int y, int z) {
+		fillBlocks(8, x - 2, y - 4, z - 2, 5, 2, 5);
+		fillBlocks(8, x - 1, y - 6, z - 1, 3, 2, 3);
+		for (int i = 0; i < 5; i++) {
+			setBlock(7, x, y - i, z);
+		}
+	}
+
+	public int[] getBlocks() {
+		return worldBlocks;
+	}
+}