# Tire States

To be used with UpdateVehicleDamageStatus and GetVehicleDamageStatus.

Each tire has two states - popped and not popped. Binary Digits (bits) also have two states - 0 and 1. A technique called bit masking is used to store more information in less memory. A 1 represents a popped tire, and a 0 represents a tire that isn't popped. For example, '0101' - two tires are popped, two are not.

Bitwise operators can be used to work with bit masking. Note Even vehicles with more than 4 wheels (e.g. trucks) only have 4 tire states.

Here is a visual representation of the tire states. Vehicle viewed from a top-down perspective, the top is the front of the vehicle.

o = inflated tire

x = popped tire

## 4-wheeled vehicles

4 binary bits for 4-wheeled vehicles: (FL)(BL)(FR)(BR) (Front-Left, Back-Left, Front-Right and Back-Right)

0: (0000)

```    o-o
| |
o-o
```

1: (0001)

```    o-o
| |
o-x
```

2: (0010)

```    o-x
| |
o-o
```

3: (0011)

```    o-x
| |
o-x
```

4: (0100)

```    o-o
| |
x-o
```

5: (0101)

```    o-o
| |
x-x
```

6: (0110)

```    o-x
| |
x-o
```

7: (0111)

```    o-x
| |
x-x
```

8: (1000)

```    x-o
| |
o-o
```

9: (1001)

```    x-o
| |
o-x
```

10: (1010)

```    x-x
| |
o-o
```

11: (1011)

```    x-x
| |
o-x
```

12: (1100)

```    x-o
| |
x-o
```

13: (1101)

```    x-o
| |
x-x
```

14: (1110)

```    x-x
| |
x-o
```

15: (1111)

```    x-x
| |
x-x
```

After 15 the values are repeated, so 16 is 0, 17 is 1 and so on.

## Bikes

Bike viewed from a top-down perspective, the top is the front of the bike.

2 binary bits for 2-wheeled vehicles: (F)(B) (Front and Back)

0: (00)

```    o
|
o
```

1: (01)

```    o
|
x
```

2: (10)

```    x
|
o
```

3: (11)

```    x
|
x
```

After 3 the values are repeated, so 4 is 0, 5 is 1 and so on.

Example Usage:

To pop the back two tires of a vehicle (with 4 wheels) while keeping the front the same state:

```new Panels, Doors, Lights, Tires;
GetVehicleDamageStatus(vehicleid, Panels, Doors, Lights, Tires);
UpdateVehicleDamageStatus(vehicleid, Panels, Doors, Lights, (Tires | 0b0101));```