[Bug] Degrees/Radians are being mixed up

[Jeffdude]

Hi there! Thank you for your work on this project. I noticed one issue that I'm having to patch for my purposes, where the rotationFunction's output is being treated like radians here:

react-native-wheely/src/WheelPickerItem.tsx

Lines 44 to 48 in 4a13bfb

	let y =
	(height / 2) * (1 - Math.sin(Math.PI / 2 - rotationFunction(i)));
	for (let j = 1; j < i; j++) {
	y += height * (1 - Math.sin(Math.PI / 2 - rotationFunction(j)));
	}

While simultaneously being treated like degress here:

react-native-wheely/src/WheelPickerItem.tsx

Lines 108 to 111 in 4a13bfb

	const y = rotationFunction(x);
	range.unshift(`${y}deg`);
	range.push(`${y}deg`);
	}

My fix for this is simply to rename deg to rad on L109,L110. Full diff is here:

diff --git a/node_modules/react-native-wheely/lib/WheelPickerItem.js b/node_modules/react-native-wheely/lib/WheelPickerItem.js
index 48e7962..b3d1278 100644
--- a/node_modules/react-native-wheely/lib/WheelPickerItem.js
+++ b/node_modules/react-native-wheely/lib/WheelPickerItem.js
@@ -78,11 +78,11 @@ const WheelPickerItem = ({ textStyle, style, height, option, index, visibleRest,
             return range;
         })(),
         outputRange: (() => {
-            const range = ['0deg'];
+            const range = ['0rad'];
             for (let x = 1; x <= visibleRest + 1; x++) {
                 const y = rotationFunction(x);
-                range.unshift(`${y}deg`);
-                range.push(`${y}deg`);
+                range.unshift(`${y}rad`);
+                range.push(`${y}rad`);
             }
             return range;
         })(),

Now I am able to specify rotationFunction={(x) => x*(Math.PI/6)} with visibleRest = 2 meaning that each step is 30 degrees, and the last visible item is rotated 90 degrees, giving my wheel the impression of a true wheel.

If you'd like, I can put up a PR for this fix, as well as adjusting the default of the rotation function to be... (x) => x*(Math.PI/(2*visibleRest)).

Let me know if you have any further questions, or need any more information from me.