Craig Tuttle Craigtut

## portraitRotation.js
// event from touch event on a view
const { pageX, pageY } = event.nativeEvent;
const x0 = pageX / Metrics.screenWidth;
const y0 = pageY / Metrics.screenHeight;

const x = y0;
const y = -x0 + 1;

// x and y have now been rotated 90 deg clockwise and translated back into normalized coordinates.
	// event from touch event on a view
	const { pageX, pageY } = event.nativeEvent;
	const x0 = pageX / Metrics.screenWidth;
	const y0 = pageY / Metrics.screenHeight;

	const x = y0;
	const y = -x0 + 1;

	// x and y have now been rotated 90 deg clockwise and translated back into normalized coordinates.