How to refer to the rocket's x feild?.Someone please help..

Question about the task

Under discussion

How to refer to the rocket's x feild? you need to set the downFire object's x field to the rocket's x field + (width / 2),

At this stage, we'll draw our first animation. We will need show and hide methods, which will be responsible for displaying and hiding the exhaust blast, as well as a switchFire method, which will set the coordinates of the exhaust and call the show and hide methods, depending on the passed argument. To display the exhaust blast below the center of the rocket, its x and y coordinates must be set as follows:

we set the blast’s x coordinate to the rocket’s x (position of the left edge) + the rocket’s width divided by 2. This will put the blast’s x coordinate in the middle of the rocket;
we set the blast’s y coordinate to the rocket’s y (position of the top edge) + the rocket’s height. This will put the blast’s y coordinate at the bottom of the rocket;

Don’t forget to call the switchFire method in the move method — this will makes it possible to change the animation at each step of the game.
We also need to override the rocket’s draw method in order to have the ability to draw the exhaust blast together with the rocket.

Requirements:

The RocketFire class must have a public void show() method.
The show() method must set the isVisible field to true.
The RocketFire class must have a public void hide() method.
The hide() method must set the isVisible field to false.
The Rocket class must have a private void switchFire(boolean isUpPressed) method.
In the switchFire(boolean) method, you need to set the downFire object's x field to the rocket's x field + (width / 2), if the method's parameter is true.
In the switchFire(boolean) method, you need to set the downFire object's y field to the rocket's y field + the rocket's height, if the method's parameter is true.
In the switchFire(boolean) method, you must call the show() method on the downFire object if the method's parameter is true.
In the switchFire(boolean) method, you must call the hide() method on the downFire object if the method's parameter is false.
In the Rocket class's move(boolean, boolean, boolean) method, the switchFire(boolean) method must be called last with the isUpPressed parameter.
In the Rocket class, the draw(Game) method of the GameObject parent class must be overridden.
In the Rocket class's draw(Game) method, you must call the base class's method using the "super" keyword.
In the Rocket class's draw(Game) method, call the draw(Game) method on the downFire object.

package com.codegym.games.moonlander; public class ShapeMatrix { public static final int[][] ROCKET = new int[][]{ {0, 0, 0, 6, 0, 0, 0}, {0, 0, 6, 6, 6, 0, 0}, {0, 0, 6, 0, 6, 0, 0}, {0, 0, 6, 6, 6, 0, 0}, {0, 0, 6, 0, 6, 0, 0}, {0, 0, 6, 6, 6, 0, 0}, {0, 6, 6, 0, 6, 6, 0}, {6, 6, 6, 6, 6, 6, 6}, {6, 0, 0, 6, 0, 0, 6}, }; public static final int[][] ROCKET_CRASH = new int[][]{ {0, 0, 0, 5, 0, 0, 0}, {0, 0, 5, 5, 5, 0, 0}, {0, 0, 5, 0, 5, 0, 0}, {0, 0, 5, 5, 5, 0, 0}, {0, 0, 5, 0, 5, 0, 0}, {0, 0, 5, 5, 5, 0, 0}, {0, 5, 5, 0, 5, 5, 0}, {5, 5, 5, 5, 5, 5, 5}, {5, 0, 0, 5, 0, 0, 5}, }; public static final int[][] LANDSCAPE = new int[][]{ {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 3, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 3, 0, 0, 0, 0, 0, 0}, {3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 3, 0, 0, 0, 0, 0, 0}, {3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 3, 0, 0, 0, 0, 0}, {0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 3, 0, 0, 0, 0, 0}, {0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 3, 0, 0, 0, 0, 0}, {0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 0, 0}, {0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 0, 0}, {0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 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0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, }; public static final int[][] PLATFORM = new int[][]{ {3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3} }; public static final int[][] FIRE_DOWN_1 = new int[][]{ {5}, {5}, {0}, {5}, {5}, {0}, {5}, }; public static final int[][] FIRE_DOWN_2 = new int[][]{ {0}, {5}, {5}, {0}, {5}, {5}, {0}, }; public static final int[][] FIRE_DOWN_3 = new int[][]{ {5}, {0}, {5}, {5}, {0}, {5}, {5}, }; public static final int[][] FIRE_SIDE_1 = new int[][]{ {5, 0, 5} }; public static final int[][] FIRE_SIDE_2 = new int[][]{ {0, 5, 0} }; }

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Guadalupe Gagnon

Level 37 , Tampa, United States

24 February 2021, 19:59

x ↑ that is the answer. The field is called x and it is a public double. Therefor just x will be sufficient unless there was a local variable in the method already called x, which would conflict with the class variable, in which case you would need to use this.x. There is no conflicting variable in the switchFire() method though.

Josephine

Level 26 , Normal, United States

25 February 2021, 00:35

Got it.Thanks