Function sineShape

sineShape(period?): Modulate
Returns a function that shapes a 0..1 value as a sine waveform.
```
const s = sineShape();
// Calculate value of sine wave at 50%
// By default there is one oscillation, thus
// it will be the middle of the cycle.
s(0.5); 
```
The period determines number of cycles for an input value of 1.
```
// Oscillate twice in 0..1 range
const s = sineShape(2);
```
No bounds checks are performed on input value. Ensure it is 0..1 (inclusive).
Parameters
- period: number = 1
Returns Modulate