Add fade cycle modev0.2

1 files changed, 95 insertions, 0 deletions

diff --git a/NucLedController/FadeColourCyclerControlMode.cs b/NucLedController/FadeColourCyclerControlMode.cs
new file mode 100644
index 0000000..ba982ca
--- /dev/null
+++ b/NucLedController/FadeColourCyclerControlMode.cs
@@ -0,0 +1,95 @@
+using System;
+using System.Linq;
+using System.Timers;
+
+namespace NucLedController
+{    
+    class FadeColourCyclerControlMode : IControlMode
+    {
+        private enum FadeDirection
+        {
+            Up,
+            Down
+        }
+
+        private readonly Timer timer;
+        private int currentColourIndex;
+        private readonly int maxColourIndex = LEDColour.AvailableColours.Count - 1;
+
+        private readonly byte brightnessStepping = 0x05; 
+        private byte currentBrightness = 0x00;
+        private byte maxBrightness = 0x64;
+        private byte minBrightness = 0x00;
+        private FadeDirection fadeDirection = FadeDirection.Up;
+
+        public FadeColourCyclerControlMode(int intervalMs)
+        {
+            timer = new Timer();
+            timer.Elapsed += new ElapsedEventHandler(Tick);
+
+            // This should be enforced through the GUI but it causes the sliders input text box to behave weirdly when typing a single number
+            if (intervalMs < 100)
+            {
+                intervalMs = 100;
+            }
+
+            // There are 0x64 (100d) brightness values, so divide the desired interval time by brightness stepping to get the tick rate
+            timer.Interval = intervalMs / (100/brightnessStepping);
+        }
+
+        private void Tick(object source, ElapsedEventArgs e)
+        {
+            LEDController.SetLEDState(LEDTransition.AvailableTransitions.Find(t => t.Identifier.ToString() == "ALWAYS_ON"), LEDColour.AvailableColours.ElementAt(currentColourIndex), currentBrightness);
+
+            // TODO more of the fade duration should be spent at the lower brightness levels, since the perceived change in brightness is much more apparent at the bottom end.
+            // e.g. the perceived difference between 0x10 and 0x20 is much larger than 0x50 and 0x60, so scaling up linearly wastes a lot of time increasing imperceivable brightness changes at the top of the range.
+            // presumably its logarithmic, like with sound?
+            if (fadeDirection == FadeDirection.Up)
+            {
+                if(currentBrightness == maxBrightness)
+                {
+                    // Fade up finished, start fading down
+                    fadeDirection = FadeDirection.Down;
+                }
+                else
+                {
+                    // Continue fading up
+                    currentBrightness += brightnessStepping;
+                }
+            }
+            else // Fading down
+            {
+                if(currentBrightness == minBrightness)
+                {
+                    // Fade cycle complete. Change colour and fade up
+                    fadeDirection = FadeDirection.Up;
+
+                    if (currentColourIndex == maxColourIndex)
+                    {
+                        currentColourIndex = 0;
+                    }
+                    else
+                    {
+                        currentColourIndex++;
+                    }
+                }
+                else
+                {
+                    // Continue fading down
+                    currentBrightness -= brightnessStepping;
+                }
+            }
+            
+        }
+
+        public void Start()
+        {
+            timer.Start();
+        }
+
+        public void Stop()
+        {
+            timer.Stop();
+        }
+    }
+}