Function previousPoint

public/assets/bower_components/Chart.js/Chart.js:2777–2779

(point, collection, index)

				return helpers.findNextWhere(collection, hasValue, index) || point;
			},
			previousPoint = function(point, collection, index){
				return helpers.findPreviousWhere(collection, hasValue, index) || point;
			};

			this.scale.draw(easingDecimal);