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libraries/NeoPixelBus_by_Makuna/src/internal/NeoHueBlend.h

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+/*-------------------------------------------------------------------------
+NeoHueBlend provides method objects that can be directly consumed by
+blend template functions in HslColor and HsbColor
+
+Written by Michael C. Miller.
+
+I invest time and resources providing this open source code,
+please support me by dontating (see https://github.com/Makuna/NeoPixelBus)
+
+-------------------------------------------------------------------------
+This file is part of the Makuna/NeoPixelBus library.
+
+NeoPixelBus is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as
+published by the Free Software Foundation, either version 3 of
+the License, or (at your option) any later version.
+
+NeoPixelBus is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with NeoPixel.  If not, see
+<http://www.gnu.org/licenses/>.
+-------------------------------------------------------------------------*/
+#pragma once
+
+class NeoHueBlendBase
+{
+protected:
+    static float FixWrap(float value)
+    {
+        if (value < 0.0f)
+        {
+            value += 1.0f;
+        }
+        else if (value > 1.0f)
+        {
+            value -= 1.0f;
+        }
+        return value;
+    }
+};
+
+class NeoHueBlendShortestDistance : NeoHueBlendBase
+{
+public:
+    static float HueBlend(float left, float right, float progress)
+    {
+        float delta = right - left;
+        float base = left;
+        if (delta > 0.5f)
+        {
+            base = right;
+            delta = 1.0f - delta;
+            progress = 1.0f - progress;
+        }
+        else if (delta < -0.5f)
+        {
+            delta = 1.0f + delta;
+        }
+        return FixWrap(base + (delta) * progress);
+    };
+};
+
+class NeoHueBlendLongestDistance : NeoHueBlendBase
+{
+public:
+    static float HueBlend(float left, float right, float progress)
+    {
+        float delta = right - left;
+        float base = left;
+        if (delta < 0.5f && delta >= 0.0f)
+        {
+            base = right;
+            delta = 1.0f - delta;
+            progress = 1.0f - progress;
+        }
+        else if (delta > -0.5f && delta < 0.0f)
+        {
+            delta = 1.0f + delta;
+        }
+        return FixWrap(base + delta * progress);
+    };
+};
+
+class NeoHueBlendClockwiseDirection : NeoHueBlendBase
+{
+public:
+    static float HueBlend(float left, float right, float progress)
+    {
+        float delta = right - left;
+        float base = left;
+        if (delta < 0.0f)
+        {
+            delta = 1.0f + delta;
+        }
+
+        return FixWrap(base + delta * progress);
+    };
+};
+
+class NeoHueBlendCounterClockwiseDirection : NeoHueBlendBase
+{
+public:
+    static float HueBlend(float left, float right, float progress)
+    {
+        float delta = right - left;
+        float base = left;
+        if (delta > 0.0f)
+        {
+            delta = delta - 1.0f;
+        }
+
+        return FixWrap(base + delta * progress);
+    };
+};