gwt.g2d.tetris.client.Piece.java Source code

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Here is the source code for gwt.g2d.tetris.client.Piece.java

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/*
 * Copyright 2009 Hao Nguyen
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package gwt.g2d.tetris.client;

import com.google.gwt.user.client.Random;

/**
 * A tetris piece.
 * 
 * @author hao1300@gmail.com
 */
public class Piece {
    public static final int PIECE_SIZE = PieceDefinition.PIECE_SIZE;
    private final PieceDefinition pieceDefinition;
    private int rotation;

    /**
     * Creates a random tetris piece.
     */
    public Piece() {
        pieceDefinition = PieceDefinition.randomPieceDefinition();
        rotation = Random.nextInt(PIECE_SIZE);
    }

    /**
     * Gets the type of block at the given cell for the current rotation.
     * 
     * @param row
     * @param col
     * @return
     */
    public BlockType getBlock(int row, int col) {
        return pieceDefinition.getBlock(rotation, row, col);
    }

    /**
     * Rotates the piece to the left.
     */
    public void rotateLeft() {
        if (--rotation < 0) {
            rotation = PieceDefinition.TYPES_PER_PIECE - 1;
        }
    }

    /**
     * Rotates the piece to the right.
     */
    public void rotateRight() {
        if (++rotation >= PieceDefinition.TYPES_PER_PIECE) {
            rotation = 0;
        }
    }
}