tangent-at-0
function tangentAt0(ps: number[][]): number[]
Defined in local-properties-at-t/tangent/double/tangent-at-0.ts:13
Returns the tangent vector (not necessarily of unit length) of an
order 0,1,2 or 3 bezier curve at t === 0, i.e.
returns the result, [x,y], of evaluating the derivative of a linear,
quadratic or cubic bezier curve's power basis at t === 0.
- uses double precision calculations internally
Parameters:
| Name | Type | Description |
|---|---|---|
ps | number[][] | An order 1,2 or 3 bezier, e.g. [[0,0],[1,1],[2,1],[2,0]] |