Stars aren't the only objects in this game. We will also need spaceships, of course! A game object's appearance is determined by a matrix, so we'll add a matrix field to the GameObject class. In addition to the object's outline, the matrix contains the ordinals of colors in the com.javarush.engine.cell.Color enum. We'll put the object's dimensions into separate width and height fields. To draw a game object on the screen, we'll create a draw(Game game) method. For each cell in the matrix, we'll have this method call the setCellValueEx(int x, int y, Color color, String text) method on the Game object passed to it as an argument. To draw the matrix on the playing field, we need to consider the x and y coordinates of the GameObject object. These coordinates are the coordinates of the upper left cell of the matrix on the playing field.
For example:
As you can see from the example, the upper left corner of the game object's matrix has coordinates x = 2 and y = 4 on the playing field. However, relative to its own matrix, these coordinates are x = 0 and y = 0. Accordingly, the setCellValueEx method will be passed the coordinates of the upper left corner of the game object's matrix on the playing field + the coordinates of the cell within the game object's matrix (x = 2 + 0, y = 4 + 0).
For example:game.setCellValueEx(x of the object on the playing field + x in the matrix, y of the object on the playing field + y in the matrix, color, empty string);
Note that color is the color of the cell in the object's matrix. You can get it like this: Color.values()[matrix[i][j]], where i is the y coordinate in matrix and j is the x coordinate in matrix.
- The GameObject class must have a public int[][] matrix field.
- The GameObject class must have a public int width field.
- The GameObject class must have a public int height field.
- The GameObject class must have a public void setMatrix(int[][]) method.
- The setMatrix(int[][]) method must set the matrix field equal to the method parameter.
- The setMatrix(int[][]) method must initialize the width field to the value matrix[0].length.
- The setMatrix(int[][]) method must initialize the height field to the value matrix.length.
- The GameObject class must have a public void draw(Game) method.
- The draw(Game) method must call the setCellValueEx(int, int, Color, String) method on the Game object for each cell of the matrix. As arguments, pass the following: the object's x coordinate on the playing field + x in the matrix, the object's y coordinate on the playing field + y in the matrix, color, and an empty string.
- The GameObject class must have a statement that imports the entire contents of the com.codegym.engine.cell package.