FilterDemoFramework.FilterView.SetMagnitudes C# (CSharp) Method

		public void SetMagnitudes (double [] magnitudeData)
		{
			if (curveLayer == null) {
				curveLayer = new CAShapeLayer ();
				curveLayer.FillColor = UIColor.FromRGBA (0.31f, 0.37f, 0.73f, 0.8f).CGColor;
				graphLayer.AddSublayer (curveLayer);
			}

			var bezierPath = new CGPath ();
			var width = graphLayer.Bounds.Width;
			bezierPath.MoveToPoint (leftMargin, graphLayer.Frame.Height + bottomMargin);

			float lastDbPos = 0f;
			float location = leftMargin;
			var frequencyCount = frequencies?.Count ?? 0;
			var pixelRatio = (int)(Math.Ceiling (width / frequencyCount));

			for (int i = 0; i < frequencyCount; i++) {
				var dbValue = 20 * Math.Log10 (magnitudeData [i]);
				float dbPos;

				if (dbValue < -defaultGain)
					dbPos = GetLocationForDbValue (-defaultGain);
				else if (dbValue > defaultGain)
					dbPos = GetLocationForDbValue (defaultGain);
				else
					dbPos = GetLocationForDbValue ((float)dbValue);

				if (Math.Abs (lastDbPos - dbPos) >= 0.1)
					bezierPath.AddLineToPoint (location, dbPos);

				lastDbPos = dbPos;
				location += pixelRatio;

				if (location > width + graphLayer.Frame.X) {
					location = (float)width + (float)graphLayer.Frame.X;
					break;
				}
			}

			bezierPath.AddLineToPoint (location, graphLayer.Frame.Y + graphLayer.Frame.Height + bottomMargin);
			bezierPath.CloseSubpath ();

			CATransaction.Begin ();
			CATransaction.DisableActions = true;
			curveLayer.Path = bezierPath;
			CATransaction.Commit ();

			UpdateControls (true);
		}