Release 0.1.0

Example/Pods/pop/pop/POPMath.h

@@ -0,0 +1,55 @@
+/**
+ Copyright (c) 2014-present, Facebook, Inc.
+ All rights reserved.
+ 
+ This source code is licensed under the BSD-style license found in the
+ LICENSE file in the root directory of this source tree. An additional grant
+ of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+#import <Foundation/Foundation.h>
+#import <CoreGraphics/CoreGraphics.h>
+
+#import "POPDefines.h"
+#import "POPVector.h"
+
+NS_INLINE CGFloat sqrtr(CGFloat f)
+{
+#if CGFLOAT_IS_DOUBLE
+  return sqrt(f);
+#else
+  return sqrtf(f);
+#endif
+}
+
+// round to nearest sub; pass 2.0 to round to every 0.5 (eg: retina pixels)
+NS_INLINE CGFloat POPSubRound(CGFloat f, CGFloat sub)
+{
+  return round(f * sub) / sub;
+}
+
+#define MIX(a, b, f) ((a) + (f) * ((b) - (a)))
+
+// the longer the duration, the higher the necessary precision
+#define SOLVE_EPS(dur) (1. / (1000. * (dur)))
+
+#define _EQLF_(x, y, epsilon) (fabsf ((x) - (y)) < epsilon)
+
+extern void POPInterpolateVector(NSUInteger count, CGFloat *dst, const CGFloat *from, const CGFloat *to, CGFloat f);
+
+extern double POPTimingFunctionSolve(const double vec[4], double t, double eps);
+
+// quadratic mapping of t [0, 1] to [start, end]
+extern double POPQuadraticOutInterpolation(double t, double start, double end);
+
+// normalize value to [0, 1] based on its range [startValue, endValue]
+extern double POPNormalize(double value, double startValue, double endValue);
+
+// project a normalized value [0, 1] to a given range [start, end]
+extern double POPProjectNormal(double n, double start, double end);
+
+// solve a quadratic equation of the form a * x^2 + b * x + c = 0
+extern void POPQuadraticSolve(CGFloat a, CGFloat b, CGFloat c, CGFloat &x1, CGFloat &x2);
+
+// for a given tension return the bouncy 3 friction that produces no bounce
+extern double POPBouncy3NoBounce(double tension);