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We now turn to the draw and move methods.
In the move() method, you need to:
a) increase x by dx;
b) check to see whether the ship has moved beyond the boundaries of outer space [0, Space.game.getWidth()]. Use the checkBorders method.
Bear in mind that the ship's width is equal to twice its radius.

I'll implement the draw method myself: just declare an empty method.

We also need a fire() method, since our ship can shoot.
This method is called when we need to fire a shot.

In this method, you need to:
a) create two rockets;
b) set their coordinates equal to the left and right edges of the ship (the guns are located a distance of 2 from the center of the ship);
c) add these rockets to the list of rockets in the game object.

You can get it as follows:
Space.game.getRockets()

Requirements:

In the Spaceship class, implement the move() method, which increases the x field by the value of dx and checks whether the ship has reached the limits of outer space.
Add an empty draw(Canvas canvas) method in the Spaceship class.
In the Spaceship class, implement the fire() method, which creates two rockets, whose coordinates are equal to the left and right edges of the ship, and adds them to the game object's rockets field.

package com.codegym.task.task25.task2515; import java.util.ArrayList; import java.util.List; public class Space { private int width, height; private Spaceship ship; private List<Ufo> ufos = new ArrayList<>(); private List<Rocket> rockets = new ArrayList<>(); private List<Bomb> bombs = new ArrayList<>(); public static Space game; public Space(int width, int height) { this.width = width; this.height = height; } public int getWidth() { return width; } public int getHeight() { return height; } public Spaceship getShip() { return ship; } public List<Ufo> getUfos() { return ufos; } public List<Rocket> getRockets() { return rockets; } public List<Bomb> getBombs() { return bombs; } public void setShip(Spaceship ship) { this.ship = ship; } public void run() {} public void draw() {} public void sleep (int ms) {} public static void main(String[] args) {} }

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Wei Cui

Level 39 , Newark, United States

15 April 2020, 16:17

solution

checkBorders(radius * 2, Space.game.getWidth() - radius * 2, radius * 2, Space.game.getHeight() - radius * 2);