From e533edac0891482a8059a6284076a2b46ac81c04 Mon Sep 17 00:00:00 2001
From: sigonasr2 <sigonasr2@gmail.com>
Date: Sat, 15 Aug 2020 08:30:30 +0900
Subject: [PATCH] Implement all Tetris basic functions.

---
 Tetris/src/sig/game/Block.java             |   3 +
 Tetris/src/sig/game/Game.java              | 121 +++++++++++++++++----
 Tetris/src/sig/game/GameState.java         |   7 ++
 Tetris/src/sig/game/MoveDirection.java     |  12 ++
 Tetris/src/sig/game/Player.java            |  93 +++++++++++++++-
 Tetris/src/sig/game/RotationDirection.java |  12 ++
 6 files changed, 221 insertions(+), 27 deletions(-)
 create mode 100644 Tetris/src/sig/game/GameState.java
 create mode 100644 Tetris/src/sig/game/MoveDirection.java
 create mode 100644 Tetris/src/sig/game/RotationDirection.java

diff --git a/Tetris/src/sig/game/Block.java b/Tetris/src/sig/game/Block.java
index a47584d..0100205 100644
--- a/Tetris/src/sig/game/Block.java
+++ b/Tetris/src/sig/game/Block.java
@@ -11,4 +11,7 @@ public class Block {
 		this.active=active;
 		this.color=col;
 	}
+	public String toString() {
+		return active?"O":"-";
+	}
 }
diff --git a/Tetris/src/sig/game/Game.java b/Tetris/src/sig/game/Game.java
index 5be5bae..bb5df8f 100644
--- a/Tetris/src/sig/game/Game.java
+++ b/Tetris/src/sig/game/Game.java
@@ -1,6 +1,7 @@
 package sig.game;
 
 import java.awt.Point;
+import java.util.Arrays;
 import java.util.Timer;
 import java.util.TimerTask;
 
@@ -15,6 +16,11 @@ public class Game {
 	public static int tickDelay = 60;
 	public static int rotation = 0; //0-3
 	public static Grid gameGrid = new Grid();
+
+	public static int rotateDelay = 20;
+	public static int rotateTimer = rotateDelay;
+	
+	public static GameState state = GameState.PLAYING;
 	
 	public static void main(String[] args) {
 		
@@ -26,8 +32,8 @@ public class Game {
 					+	"XXXX"),
 				new Shape(
 						"XXXX"
-					+	"OOOO"
-					+	"OXXX"
+					+	"XOOO"
+					+	"XOXX"
 					+	"XXXX"),
 				new Shape(
 						"XOOX"
@@ -36,8 +42,8 @@ public class Game {
 					+	"XXXX"),
 				new Shape(
 						"XXXX"
-					+	"XXXO"
-					+	"OOOO"
+					+	"XXOX"
+					+	"OOOX"
 					+	"XXXX")
 				,Color.ORANGE);
 		final Frame JPiece = new Frame(
@@ -47,8 +53,8 @@ public class Game {
 					+	"XOOX"
 					+	"XXXX"),
 				new Shape(
-						"OXXX"
-					+	"OOOO"
+						"XOXX"
+					+	"XOOO"
 					+	"XXXX"
 					+	"XXXX"),
 				new Shape(
@@ -57,8 +63,8 @@ public class Game {
 					+	"XOOX"
 					+	"XXXX"),
 				new Shape(
-						"OOOO"
-					+	"XXXO"
+						"OOOX"
+					+	"XXOX"
 					+	"XXXX"
 					+	"XXXX")
 				,Color.BLUE);
@@ -193,12 +199,22 @@ public class Game {
 	
 	static void step() {
 		tickDelay--;
+		rotateTimer--;
 		if (tickDelay<=0) {
 			moveBlock();
 			tickDelay=levelDelay[level];
 		}
+		if (rotateTimer<=0) {
+			//p.rotateCounterClockwise();
+			p.moveBlockLeft();
+			rotateTimer=rotateDelay;
+		}
+		DrawBoard();
+	}
+
+	private static void DrawBoard() {
 		ClearScreen();
-		Point[] checkPoints = p.GetPlayerBlocksInGrid();
+		Point[] checkPoints = p.GetPlayerBlocksInGrid(p.getCurrentShape());
 		for (int y=19;y>=0;y--) {
 			for (int x=0;x<10;x++) {
 				boolean plotted=false;
@@ -210,7 +226,7 @@ public class Game {
 					}
 				}
 				if (!plotted) {
-					System.out.print((gameGrid.grid[x][y].active)?'O':'-');
+					System.out.print(gameGrid.grid[x][y]);
 				}
 			}
 			System.out.println();
@@ -236,25 +252,88 @@ public class Game {
 			}
 		}*/
 		
-		Point[] checkPoints = p.GetPlayerBlocksInGrid();
+		Point[] checkPoints = p.GetPlayerBlocksInGrid(p.getCurrentShape());
+		
+		boolean isOccupied = isOccupied(checkPoints,new Point(0,-1));
 		
+		if (isOccupied) {
+			SnapPieceThatCollided(checkPoints);
+			ClearLinesThatHaveFullRows();
+		} else {
+			MovePlayerBlockDownByOne();
+		}
+	}
+
+	private static void ClearLinesThatHaveFullRows() {
+		int deletionRows=0;
+		for (int y=0;y<gameGrid.grid[0].length;y++) {
+			//System.out.println("Called: "+y);
+			deletionRows = CheckAndClearFullRows(deletionRows, y);
+		}
+	}
+
+	private static int CheckAndClearFullRows(int deletionRows, int y) {
+		boolean isAllActive=true;
+		for (int x=0;x<gameGrid.grid.length;x++) {
+			//System.out.print(gameGrid.grid[x][y]);
+			if (!gameGrid.grid[x][y].active) {
+				isAllActive=false;
+				break;
+			}
+		}
+		//System.out.println();
+		if (isAllActive) {
+			//Take every block above this row, and shift it all down by one.
+			//x is the current row we are on.
+			//Move every row down, if we find a row that is also a match, increment the amount of rows we move down by 1.
+			deletionRows++;
+		} else {
+			for (int x=0;x<gameGrid.grid.length;x++) {
+				ShiftBlockDownByNumberOfDeletionRows(deletionRows, y, x);
+			}
+		}
+		return deletionRows;
+	}
+
+	private static void ShiftBlockDownByNumberOfDeletionRows(int deletionRows, int y, int x) {
+		if (deletionRows>0) {
+			gameGrid.grid[x][y-deletionRows].active=gameGrid.grid[x][y].active;
+			gameGrid.grid[x][y].active=false;
+		}
+	}
+
+	private static void MovePlayerBlockDownByOne() {
+		p.pos.translate(0, -1);
+	}
+
+	private static void SnapPieceThatCollided(Point[] checkPoints) {
+		for (Point point : checkPoints) {
+			//If any point in the grid is outside, this is our lose condition.
+			if (point.y>=gameGrid.grid[0].length) {
+				state = GameState.LOSE;
+			}
+			gameGrid.grid[point.x][point.y].active=true;
+		}
+		p.ShuffleNextPiece();
+	}
+
+	static boolean isOccupied(Point[] checkPoints) {
+		return isOccupied(checkPoints,new Point(0,0));
+	}
+	static boolean isOccupied(Point[] checkPoints,Point offset) {
 		boolean isOccupied = false;
 		for (int i=0;i<checkPoints.length;i++) {
 			Point point = checkPoints[i];
 			//point.translate(p.pos.x,p.pos.y);
-			if (point.y-1<0 || gameGrid.grid[point.x][point.y-1].active) {
+			if (point.y+offset.y<0 ||  
+					point.y+offset.y>=gameGrid.grid[0].length||  
+					point.x+offset.x>=gameGrid.grid.length||  
+					point.x+offset.x<0
+					|| gameGrid.grid[point.x+offset.x][point.y+offset.y].active) {
 				isOccupied=true;
 				break;
 			}
 		}
-		
-		if (isOccupied) {
-			for (Point point : checkPoints) {
-				gameGrid.grid[point.x][point.y].active=true;
-			}
-			p.ShuffleNextPiece();
-		} else {
-			p.pos.translate(0, -1);
-		}
+		return isOccupied;
 	}
 }
diff --git a/Tetris/src/sig/game/GameState.java b/Tetris/src/sig/game/GameState.java
new file mode 100644
index 0000000..8141986
--- /dev/null
+++ b/Tetris/src/sig/game/GameState.java
@@ -0,0 +1,7 @@
+package sig.game;
+
+public enum GameState {
+	PLAYING,
+	WIN,
+	LOSE;
+}
diff --git a/Tetris/src/sig/game/MoveDirection.java b/Tetris/src/sig/game/MoveDirection.java
new file mode 100644
index 0000000..2037e7c
--- /dev/null
+++ b/Tetris/src/sig/game/MoveDirection.java
@@ -0,0 +1,12 @@
+package sig.game;
+
+public enum MoveDirection {
+	LEFT(-1),
+	RIGHT(1);
+	
+	int value;
+	
+	MoveDirection(int value) {
+		this.value=value;
+	}
+}
diff --git a/Tetris/src/sig/game/Player.java b/Tetris/src/sig/game/Player.java
index 6da9993..24d3e9c 100644
--- a/Tetris/src/sig/game/Player.java
+++ b/Tetris/src/sig/game/Player.java
@@ -16,10 +16,6 @@ public class Player {
 		nextPiece = SelectRandomTetrimino();
 		pos = new Point(5,20);
 	}
-
-	private Frame SelectRandomTetrimino() {
-		return Game.piecePool[(int)(Math.random()*Game.piecePool.length)];
-	}
 	
 	public void ShuffleNextPiece() {
 		piece = nextPiece.clone();
@@ -27,9 +23,9 @@ public class Player {
 		pos = new Point(5,20);
 	}
 	
-	public Point[] GetPlayerBlocksInGrid() {
+	public Point[] GetPlayerBlocksInGrid(Shape s) {
 		Point[] checkPoints = new Point[4];
-		Shape tetShape = piece.shape[Game.rotation];
+		Shape tetShape = s;
 		int pointsInserted=0;
 		for (int x=0;x<tetShape.shape.length;x++) {
 			for (int y=0;y<tetShape.shape[0].length;y++) {
@@ -42,4 +38,89 @@ public class Player {
 		}
 		return checkPoints;
 	}
+	
+	public Shape getCurrentShape() {
+		return piece.shape[Game.rotation];
+	}
+	
+	public void rotateClockwise() {
+		//Get the new rotated piece.
+		//See if the current piece position with the new rotation shape overlaps any active squares.
+		//If they do, try to shift the piece one left, and compare again.
+		//If they still do, try to shift the piece one right, and compare again.
+		//If no piece position is free, we cannot rotate. Return.
+		//Otherwise, all conditions have been met, and we can rotate the piece.
+		Point[] checkPoints = GetPlayerBlocksInGrid(GetClockwiseRotatedCurrentPiece());
+		RotateIfSpaceIsFree(checkPoints,RotationDirection.CLOCKWISE);
+	}
+	
+	public void rotateCounterClockwise() {
+		Point[] checkPoints = GetPlayerBlocksInGrid(GetCounterClockwiseRotatedCurrentPiece());
+		RotateIfSpaceIsFree(checkPoints,RotationDirection.COUNTERCLOCKWISE);
+	}
+	
+	public void moveBlockRight() {
+		moveBlock(MoveDirection.RIGHT);
+	}
+	public void moveBlockLeft() {
+		moveBlock(MoveDirection.LEFT);
+	}
+	
+	
+	
+	
+	
+	
+	
+	private void moveBlock(MoveDirection dir) {
+		Point[] checkPoints = GetPlayerBlocksInGrid(getCurrentShape());
+		boolean isFree = true;
+		for (Point p : checkPoints) {
+			if (Game.isOccupied(checkPoints,new Point(dir.value,0))) {
+				isFree=false;
+				break;
+			}
+		}
+		if (isFree) {
+			pos.translate(dir.value, 0);
+		}
+	}
+
+	private Frame SelectRandomTetrimino() {
+		return Game.piecePool[(int)(Math.random()*Game.piecePool.length)];
+	}
+
+	private void RotateIfSpaceIsFree(Point[] checkPoints,RotationDirection dir) {
+		int[] offset = new int[]{0,-1,1};
+		int freeOffset = -1;
+		for (int i=0;i<offset.length;i++) {
+			if (!Game.isOccupied(checkPoints,new Point(offset[i],0))) {
+				freeOffset = offset[i];
+				break;
+			}
+		}
+		if (freeOffset!=-1) {
+			pos.translate(freeOffset, 0);
+			Game.rotation=rotatePiece(Game.rotation,dir);
+			//System.out.println("rotation: "+Game.rotation);
+		}
+	}
+
+	private Shape GetClockwiseRotatedCurrentPiece() {
+		return piece.shape[rotatePiece(Game.rotation,RotationDirection.CLOCKWISE)];
+	}
+	private Shape GetCounterClockwiseRotatedCurrentPiece() {
+		return piece.shape[rotatePiece(Game.rotation,RotationDirection.COUNTERCLOCKWISE)];
+	}
+	
+	private int rotatePiece(int currentRotation,RotationDirection direction) {
+		currentRotation+=direction.value;
+		if (currentRotation<0) {
+			currentRotation=3;
+		} else
+		if (currentRotation>3) {
+			currentRotation=0;
+		}
+		return currentRotation;
+	}
 }
diff --git a/Tetris/src/sig/game/RotationDirection.java b/Tetris/src/sig/game/RotationDirection.java
new file mode 100644
index 0000000..bdee29d
--- /dev/null
+++ b/Tetris/src/sig/game/RotationDirection.java
@@ -0,0 +1,12 @@
+package sig.game;
+
+public enum RotationDirection {
+	CLOCKWISE(1),
+	COUNTERCLOCKWISE(-1);
+	
+	int value;
+	
+	RotationDirection(int value) {
+		this.value=value;
+	}
+}