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