A Direction2d represents a direction like 'up' or 'north' or 'forwards'. They are represented using X and Y components, and can be converted to vectors if necessary, but should be thought of as conceptually different. Directions have several uses, such as:

• Constructing a vector from a length and direction
• Determining the component of a vector in a particular direction (for example, finding the component of velocity in the up direction to get vertical speed)
• Determining the (signed) angle between two directions
• Defining the orientation of an axis or reference frame

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