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30 lines
728 B
C
30 lines
728 B
C
//
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// Copyright (c) 2017 Open Whisper Systems. All rights reserved.
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//
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NS_ASSUME_NONNULL_BEGIN
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// TODO: We'll eventually want to promote these into an OWSMath.h header.
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static inline CGFloat Clamp(CGFloat value, CGFloat minValue, CGFloat maxValue)
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{
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return MAX(minValue, MIN(maxValue, value));
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}
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static inline CGFloat Clamp01(CGFloat value)
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{
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return Clamp(value, 0.f, 1.f);
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}
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static inline CGFloat CGFloatLerp(CGFloat left, CGFloat right, CGFloat alpha)
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{
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alpha = Clamp01(alpha);
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return (left * (1.f - alpha)) + (right * alpha);
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}
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static inline CGFloat CGFloatInverseLerp(CGFloat value, CGFloat minValue, CGFloat maxValue)
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{
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return (value - minValue) / (maxValue - minValue);
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}
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NS_ASSUME_NONNULL_END
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