Giving the player a crosshair

Adding a crosshair is easy and only requires one new concept. Add the following highlighted code, and then we can run through it:

// 100 bullets should do
Bullet bullets[100];
int currentBullet = 0;
int bulletsSpare = 24;
int bulletsInClip = 6;
int clipSize = 6;
float fireRate = 1;
// When was the fire button last pressed?
Time lastPressed;
// Hide the mouse pointer and replace it with crosshair
window.setMouseCursorVisible(true);
Sprite spriteCrosshair;
Texture textureCrosshair = TextureHolder::GetTexture("graphics/crosshair.png");
spriteCrosshair.setTexture(textureCrosshair);
spriteCrosshair.setOrigin(25, 25);
// The main game loop
while (window.isOpen())

First, we call the setMouseCursorVisible function on our window object. We then load a Texture and declare a Sprite instance and initialize it in the usual way. Furthermore, we set the sprite's origin to its center to make it convenient and simpler to make the bullets fly to the...