To do this, write a setCellColoredNumber method that will take as arguments a cell's coordinates and value, and:
- calculate the cell color (using the getColorByValue method, which is described below),
- display the cell value and color on the game board.
To calculate the color, we implement the getColorByValue helper method, which will return a color based on the cell value passed to method. For example, if we pass 2 to the method, then it returns Color.BLUE, etc. Cells with different values should have different colors; cells with the same values should have the same color. The numbers that can exist in the gameField matrix are: 0, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048.
To display the cell value and color with coordinates (x, y) on the game board, the Game class's special setCellValueEx(int x, int y, Color cellColor, String value) method comes to our aid.
Use it to change the cell color and value at the same time.
Don't display the value 0 on the game board: instead, we simply see an empty cell. Therefore, for cells with the value 0, simply pass an empty string to the setCellValueEx() method.
And the final touch: in the drawScene() method, replace the call to the setCellColor() method with the setCellColoredNumber() method.
Notes:
1. For clarity, empty cells will be denoted by zeros in the examples.
2. The matrix coordinates must match the displayed coordinates.
Example:
Matrix: {
{ 2, 4, 8, 16},
{ 32, 64, 128, 256},
{512, 1024, 2048, 0},
{ 2, 4, 8, 16}
}
Corresponding representation:
To do this, when setting a value on the game board, invert the matrix coordinates. For example, to set the value of the cell with coordinates (x, y), use the matrix value gameField[y][x].
To better understand what we're saying, draw the matrix — first using gameField[y][x], and then gameField[x][y].
- A private Color getColorByValue(int value) method must be created in the Game2048 class. It must return a cell color based on its value.
- A private void setCellColoredNumber(int x, int y, int value) method must be created in the Game2048 class.
- The setCellColoredNumber(int, int, int) method must call the getColorByValue(int) method.
- The setCellColoredNumber(int, int, int) method must call the setCellValueEx(int, int, Color, String) method.
- The setCellColoredNumber(int, int, int) method must change the color of a tile depending on its value.
- The setCellColoredNumber(int, int, int) method must not display a tile's value if it is 0.
- In the drawScene() method, the call to the setCellColor(int, int, Color) method must be replaced by setCellColoredNumber(int, int, int), so that the values and colors of the tiles on the game board correspond to the values in the gameField matrix.