private fun highlightGraphEvent(xTapCoordinate: Int, yTapCoordinate: Int) {

	var closestEntry: Entry? = null
	var minDistance: Int? = null


	// Filter for BG's, loop through, checking whether 'Tap' coordinates are within range of each BG
	lineData.getDataSetByLabel("BG", true).let {

		for (index in 0 until it.entryCount) {
			val entry = it.getEntryForIndex(index)

			// Calculate the distance from the BG
			distanceFromBG(entry, xTapCoordinate, yTapCoordinate)?.let { calcDistFromBG ->

				// Update minDistance if minDistace == null or calculated distance is less than
				minDistance?.let { currentMinDist ->
					if (calcDistFromBG < currentMinDist) {
						minDistance = calcDistFromBG
						closestEntry = entry.data as Bg
					}
				} ?: calcDistFromBG

			}
		}
	}