connect-four/src/de/itsblue/ConnectFour/GameBoard.java

/*
    Connect four - written in java
    Copyright (C) 2020 Oliver Schappacher and Dorian Zedler

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package de.itsblue.ConnectFour;

import javax.swing.*;
import java.awt.*;

public class GameBoard extends JPanel {

    /**
     *
     */
    private static final long serialVersionUID = 1L;

    /**
     * The rows of the board
     */
    public int BoardRows = 6;

    /**
     * The columns of the board
     */
    public int BoardColumns = 7;

    /**
     * Array containing all plate containers
     */
    PlateContainer[][] BoardContainers = new PlateContainer[BoardColumns][BoardRows];

    /**
     * Constructor
     */
    GameBoard() {
        this.initBoard();
    }

    /**
     * Function to insert a plate into a specific column
     * 
     * @param plate  Plate object to insert
     * @param column The column to insert the plate into
     * @return true if the inserton was successfull, false if the column is full
     */
    public boolean insertPlate(Plate plate, int column) {

        // check if the column is out of range
        if (column > BoardColumns - 1)
            return false;

        // search for an empty row
        for (int i = BoardRows - 1; i >= 0; i--) {
            if (!this.BoardContainers[column][i].containsPlate()) {
                // if the container is empty -> add the plate
                this.BoardContainers[column][i].insertPlate(plate);

                this.checkContainerForWin(column, i);

                return true;
            }
        }

        return false;
    }

    /**
     * Function to clear the board
     */
    public void clearBoard() {
        // search for an empty row
        for (int c = 0; c < BoardColumns; c++) {
            for (int r = 0; r < BoardRows; r++) {
                // create the container
                this.BoardContainers[c][r].removePlate();
            }
        }
    }

    /**
     * Function to fill the board with containers
     */
    public void initBoard() {
        // configure the main layout
        this.setLayout(new GridLayout(this.BoardRows, this.BoardColumns));

        // fill the grid with containers
        for (int i = 0; i < BoardRows; i++) {
            for (int j = 0; j < BoardColumns; j++) {
                // create the container
                this.BoardContainers[j][i] = new PlateContainer();

                // add the container
                this.add(this.BoardContainers[j][i]);
            }
        }
    }

    public int getSuggestedContainerSize(Dimension parentSize) {
        int containerSize;

        if (parentSize.getWidth() / this.BoardColumns > parentSize.getHeight() / this.BoardRows)
            containerSize = (int) parentSize.getHeight() / this.BoardRows;
        else
            containerSize = (int) parentSize.getWidth() / this.BoardColumns;

        return containerSize;
    }

    /**
     * Override paint function to rescale all caontainers on every repaint
     */
    @Override
    public void paint(Graphics g) {

        System.out.println("updating sizes");

        for (PlateContainer[] plateContainers : BoardContainers) {
            for (PlateContainer plateContainer : plateContainers) {
                plateContainer.setPreferredSize(new Dimension(this.getSuggestedContainerSize(this.getSize()),
                        this.getSuggestedContainerSize(this.getSize())));
            }
        }

        super.paint(g);
    }

    @Override
    public void setPreferredSize(Dimension preferredSize) {
        Dimension newSize = new Dimension(this.getSuggestedContainerSize(preferredSize) * this.BoardColumns,
                this.getSuggestedContainerSize(preferredSize) * this.BoardRows);
        super.setPreferredSize(newSize);
    }

    public boolean checkContainerForWin(int c, int r) {

        System.out.println("checking container c=" + c + " r=" + r + " for win");

        // if there is no plate in the container to check
        // -> return false
        if (this.getPlateContainer(c, r) == null || !this.getPlateContainer(c, r).containsPlate())
            return false;

        // check all possible winnings clockwise
        int[] sums = new int[8];
        for (int i = 0; i < 4; i++) {
            PlateContainer currentContainer = null;

            for (int pc = 0; pc < 8; pc++) {
                currentContainer = null;

                int checkC = 0;
                int checkR = 0;

                switch (pc) {
                case 0:
                    // check top
                    checkC = c;
                    checkR = r + i;
                    break;
                case 1:
                    // check top right vert
                    checkC = c + i;
                    checkR = r + i;
                    break;
                case 2:
                    // check right
                    checkC = c + i;
                    checkR = r;
                    break;
                case 3:
                    // check bottom right vert
                    checkC = c + i;
                    checkR = r - i;
                    break;
                case 4:
                    checkC = c;
                    checkR = r - i;
                    // check bottom
                    break;
                case 5:
                    // check bottom left vert
                    checkC = c - i;
                    checkR = r - i;
                    break;
                case 6:
                    // check left
                    checkC = c - i;
                    checkR = r;
                    break;
                case 7:
                    // check top left vert
                    checkC = c - i;
                    checkR = r + i;
                    break;
                default:
                    currentContainer = null;
                    break;
                }

                currentContainer = this.getPlateContainer(checkC, checkR);

                if (currentContainer != null && currentContainer.containsPlate())
                    sums[pc] += currentContainer.getContainedPlate().getValue();
            }
        }

        for (int sum : sums) {
            if (Math.abs(sum) == 4) {
                if (sum > 0)
                    System.out.println("negative won");
                else
                    System.out.println("positive won");

                return true;
            }
        }

        return false;
    }

    public PlateContainer getPlateContainer(int containerColumn, int containerRow) {

        if (this.BoardContainers.length > containerColumn && containerColumn >= 0
                && this.BoardContainers[containerColumn].length > containerRow && containerRow >= 0)
            return this.BoardContainers[containerColumn][containerRow];

        return null;
    }

    /*
     * void winningCondition() { for (int i = 0; i <= 2; i++) for (int j = 0; j <=
     * 6; j++) { if (GameBoard[i][j] == p && GameBoard[i + 1][j] == p && GameBoard[i
     * + 2][j] == p && GameBoard[i + 3][j] == p) { finish = true; } } for (int i =
     * 0; i <= 5; i++) for (int j = 0; j <= 3; j++) { if (GameBoard[i][j] == p &&
     * GameBoard[i][j + 1] == p && GameBoard[i][j + 2] == p && GameBoard[i][j + 3]
     * == p) finish = true; }
     * 
     * for (int i = 0; i <= 2; i++) for (int j = 0; j <= 3; j++) { if
     * (GameBoard[i][j] == p && GameBoard[i + 1][j + 1] == p && GameBoard[i + 2][j +
     * 2] == p && GameBoard[i + 3][j + 3] == p) finish = true; }
     * 
     * for (int i = 0; i < 3; i++) for (int j = 6; j > 2; j--) { if (GameBoard[i][j]
     * == p && GameBoard[i + 1][j - 1] == p && GameBoard[i + 2][j - 2] == p &&
     * GameBoard[i + 3][j - 3] == p) finish = true; } }
     */

    /*
     * void switchPlayer() { if (p != 1) p = 1; else p = 1; }
     */
}