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# parametricValue(_:offsetByDistance:)

Returns a parametric value on the B-spline that’s a specified distance from the given parametric value.

```
func parametricValue(_ parametricValue: CGFloat, offsetByDistance distanceStep: CGFloat) -> CGFloat
```

## Parameters

`parametricValue`

The floating point `[0, count-1]` parametric value.

`distanceStep`

The distance to offset `parametricValue;` `distanceStep` can be positive or negative.

## Return Value

A parametric value offset by `distanceStep` from `parametricValue`.

## Discussion

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