Basic Attributes

Attributes

The first thing to do is define some attributes that will be used to create the projection. The table below list the attributes used for this tutorial:

Attribute	Description	Value
Screen width	The width of the screen	640
Screen height	The height of the screen	480
Screen half width	The screen width divided by 2	Screen width / 2
Screen half height	The screen height divided by 2	Screen height / 2
Player FOV	The field of view of the player. Normally, the value for games is 60. (In real case, humans have a FOV of 90 but this is not pretty good for 2D screens)	60
Player Half FOV	The FOV divided by 2
Player X	The x coordinate of the player	2
Player Y	The y coordinate of the player	2
Player angle	The angle for the player view direction	90
RayCasting increment angle	The value to increment for each ray in relation of the screen width	Player FOV / Screen width
RayCasting precision	The amout of every ray position to check the wall (higher the value, more iterations) for each ray	64 is a good value
Map	The integer matrix to be the map	(Check the code for the value)