java - Checkers App 无法使用 ontouch 和 ondraw 移动棋子

Question

我正在尝试使用 Java 在 android studio 中制作 Checkers 应用程序。到目前为止，我已经能够使用自定义视图绘制棋盘和棋子并实现 on draw 方法。我的斗争是试图将我画到板上的棋子移动。我有一种方法可以为选定的块可以移动的可用单元格着色，但我不完全知道如何在单击它们时将块移动到这些单元格。在我的 onTouch 方法中，我所做的只是为板设置选定的行和列，以便我可以突出显示该单元格的可用移动。除此之外，我不知道如何为下一步获取数据并实际移动我的棋子。我知道我的代码有点草率，我仍然需要添加辅助方法，因为我重用代码但代码有效，我只是不知道如何移动我绘制的部分。

public boolean onTouchEvent(MotionEvent event) {
    boolean isValid;

    float x = event.getX();
    float y = event.getY();

    int action = event.getAction();

    if(action == MotionEvent.ACTION_DOWN){
        board.setSelectedRow((int)Math.ceil(y/cellSize));
        board.setSelcectedCol((int)Math.ceil(x/cellSize));
        isValid = true;
    }else{
        isValid = false;
    }

    return isValid;
}

private void colorAvailableCells(Canvas canvas, int row, int col) {
    if (board.getSelectedRow() != -1 && board.getSelcectedCol() != -1) {
        canvas.drawRect(col * cellSize, row * cellSize, (col - 1) * cellSize, (row - 1) * cellSize,
                selectedSquareColorPaint);
        if (board.getBoard()[board.getSelectedRow() - 1][board.getSelcectedCol() - 1] == null) {
            canvas.drawRect(col * cellSize, row * cellSize, (col - 1) * cellSize, (row - 1) * cellSize,
                    selectedSquareColorPaint);
        }else{
            if(playerOneTurn){
                if(board.getBoard()[row-1][col-1].getColor() == playerOnePieceColor){
                    if (board.isLeftCellAvailable(playerOneTurn, board.getSelectedRow() - 1, board.getSelcectedCol() - 1)) {
                        if(board.isJumpable()){
                            canvas.drawRect((col - 3) * cellSize, (row + 2) * cellSize, (col - 2) * cellSize, (row+1) * cellSize,
                                    selectedSqaureMoveColorPaint);
                        }else{
                            canvas.drawRect((col - 2) * cellSize, (row + 1) * cellSize, (col - 1) * cellSize, row * cellSize,
                                    selectedSqaureMoveColorPaint);
                        }
                        if (board.isRightCellAvailable(playerOneTurn, board.getSelectedRow() - 1, board.getSelcectedCol() - 1)) {
                            if(board.isJumpable()){
                                canvas.drawRect((col + 2) * cellSize, (row + 2) * cellSize, (col+1) * cellSize, (row+1) * cellSize,
                                        selectedSqaureMoveColorPaint);
                            }else{
                                canvas.drawRect((col + 1) * cellSize, (row + 1) * cellSize, col * cellSize, row * cellSize,
                                        selectedSqaureMoveColorPaint);
                            }
                        }
                    }else{
                        if (board.isRightCellAvailable(playerOneTurn, board.getSelectedRow() - 1, board.getSelcectedCol() - 1)) {
                            if(board.isJumpable()){
                                canvas.drawRect((col + 2) * cellSize, (row + 2) * cellSize, (col+1) * cellSize, (row+1) * cellSize,
                                        selectedSqaureMoveColorPaint);
                            }else{
                                canvas.drawRect((col + 1) * cellSize, (row + 1) * cellSize, col * cellSize, row * cellSize,
                                        selectedSqaureMoveColorPaint);
                            }
                        }
                    }
                }
            }else{
                if(board.getBoard()[row-1][col-1].getColor() == playerTwoPieceColor){
                    if (board.isLeftCellAvailable(playerOneTurn, board.getSelectedRow() - 1, board.getSelcectedCol() - 1)) {
                        if(board.isJumpable()){
                            canvas.drawRect((col - 3) * cellSize, (row - 3) * cellSize, (col - 2) * cellSize, (row - 2) * cellSize,
                                    selectedSqaureMoveColorPaint);
                        }else{
                            canvas.drawRect((col-2)*cellSize, (row-2)*cellSize, (col-1)*cellSize, (row-1)*cellSize,
                                    selectedSqaureMoveColorPaint);
                        }

                        if (board.isRightCellAvailable(playerOneTurn, board.getSelectedRow() - 1, board.getSelcectedCol() - 1)) {
                            if(board.isJumpable()){
                                canvas.drawRect((col + 2) * cellSize, (row - 3) * cellSize, (col+1) * cellSize, (row-2) * cellSize,
                                        selectedSqaureMoveColorPaint);
                            }else{
                                canvas.drawRect((col+1)*cellSize, (row-2)*cellSize, col*cellSize, (row-1)*cellSize,
                                        selectedSqaureMoveColorPaint);
                            }
                        }
                    }else{
                        if (board.isRightCellAvailable(playerOneTurn, board.getSelectedRow() - 1, board.getSelcectedCol() - 1)) {
                            if(board.isJumpable()){
                                canvas.drawRect((col + 2) * cellSize, (row - 3) * cellSize, (col+1) * cellSize, (row-2) * cellSize,
                                        selectedSqaureMoveColorPaint);
                            }else{
                                canvas.drawRect((col+1)*cellSize, (row-2)*cellSize, col*cellSize, (row-1)*cellSize,
                                        selectedSqaureMoveColorPaint);
                            }
                        }
                    }
                }
            }
        }
    }
    invalidate();
}

实际中的 checkAvailableCell 方法

标签： javaandroid-studiocanvasondrawontouch