90 degree Rotation


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Thread: 90 degree Rotation

  1. #1
    Join Date
    Jan 2006
    Posts
    15

    90 degree Rotation

    Hi, I'm trying to create a program that rotates a figure by 90 degrees clockwise. It is run in the command prompt, is supposed to output the new position of the figure. This program can be viewed as a foundation for tetris pieces. Here is an example of how it should look:

    [***]
    [-*-]
    [-*-]

    90 rotate

    [--*]
    [***]
    [--*]

    90 rotate

    [-*-]
    [-*-]
    [***]


    This is the result I get for the first 3 or 4 times the figure is rotated, but then I get random results after that. Could someone run my code and tell me what is going on?

    public class Rotation
    {
    public static boolean[][] isBlockPresent = new boolean[3][3];
    public static boolean[][] isMatrixBuffer = new boolean[3][3];

    public static void main(String args[])
    {
    isBlockPresent[1][0] = true;
    isBlockPresent[1][1] = true;
    isBlockPresent[2][1] = true;
    isBlockPresent[1][2] = true;

    for(int r = 0; r<3; r++)
    {
    System.out.print("[");

    for(int c = 0; c<3; c++)
    {
    if(isBlockPresent[c][r])
    System.out.print("*");
    else
    System.out.print("-");
    }

    System.out.println("]");
    }

    for(int m = 0; m<5; m++)
    {
    System.out.println();
    RotateClockwise();
    }

    }

    public static void RotateClockwise()
    {
    for(int r = 0; r<3; r++)
    {
    for(int c = 0; c<3; c++)
    isMatrixBuffer[c][r] = isBlockPresent[r][2 - c];
    }

    isBlockPresent = isMatrixBuffer;

    for(int r = 0; r<3; r++)
    {
    System.out.print("[");

    for(int c = 0; c<3; c++)
    {
    if(isBlockPresent[c][r])
    System.out.print("*");
    else
    System.out.print("-");
    }

    System.out.println("]");
    }
    }
    }



    Thanks,
    Ben.

  2. #2
    Join Date
    Jan 2006
    Posts
    15
    nvm, i solved it already. thx.

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