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@ue-too/math / directionAlignedToTangent

Function: directionAlignedToTangent() ​

directionAlignedToTangent(direction, tangent): boolean

Defined in: index.ts:824

Checks if a direction vector is aligned with a tangent vector.

Parameters ​

direction ​

Point

Direction vector to check

tangent ​

Point

Tangent vector reference

Returns ​

boolean

True if direction aligns with tangent (within 90 degrees)

Remarks ​

Returns true if the direction is within 90 degrees of either the tangent or its reverse. Useful for determining if movement is along a path.

Example ​

typescript
const direction = { x: 1, y: 0 };
const tangent = { x: 1, y: 0.1 }; // Slightly rotated
directionAlignedToTangent(direction, tangent); // true

const perpendicular = { x: 0, y: 1 };
directionAlignedToTangent(perpendicular, tangent); // false