java - 需要帮助防止棋子在第一次移动后移动两格

Question

我正在开发一个国际象棋游戏，并且能够让我的棋子向前移动一个和两个方格，但我很难阻止它在第一次移动后向前移动两个方格。如果有人能帮助我了解如何实现它的逻辑或想法，我将不胜感激。

这是我的代码:

 private boolean isValidPawnMove(int sourceRow, int sourceColumn, int targetRow, int        
 targetColumn) {

    boolean isValid = false;

    if(isTargetLocationFree()){ 
        if(sourceColumn == targetColumn){
            //same column
            if(sourcePiece.getColor() == Piece.YELLOW_COLOR){
                //yellow
                if(sourceRow + 1 == targetRow ){
                    //move one up
                    isValid = true;

                }else if(sourceRow + 2 == targetRow ){
                    isValid = true;
                }else{
                    //not moving one up
                    isValid = false;
                }                               
            }else{
                //brown
                if(sourceRow - 1 == targetRow){
                    //move one down
                    isValid = true;
                }else if(sourceRow - 2 == targetRow){
                    isValid = true;

                }else{
                    //not moving one down
                    isValid = false;
                }                   
            }
        }else{
            //not the same column
            isValid = false;
        }
    }else if(isTargetLocationCaptureable()){
        if(sourceColumn + 1 == targetColumn || sourceColumn - 1 == targetColumn ){
            //one column to the right or left
            if(sourcePiece.getColor() == Piece.YELLOW_COLOR){
                //yellow
                if(sourceRow + 1 == targetRow){
                    //move one up
                    isValid = true;
                }else{
                    //not moving one up
                    isValid = false;
                }
            }else{
                //brown
                if(sourceRow - 1 == targetRow ){
                    //move one down
                    isValid = true;
                }else{
                    //not moving one down                       
                    isValid = false;
                }
            }
        }else{
            //One column to the left or right
            isValid = false;
        }   
    }       
    return isValid;
}

private boolean isTargetLocationCaptureable(){
    if(targetPiece == null){
        return false;
    }else if( targetPiece.getColor() != sourcePiece.getColor()){
        return true;
    }else{
        return false;
    }
}

private boolean isTargetLocationFree(){
    return targetPiece == null;
}

Answer 1

我不会为你编写代码，但你的条件应该基于sourceRow。如果您的源行是 pawn 开始的原始行(第二行或第七行，具体取决于哪个玩家)，则 pawn 只能移动两行。