1 files changed, 0 insertions, 46 deletions
diff --git a/vendor/modernc.org/mathutil/envelope.go b/vendor/modernc.org/mathutil/envelope.go
deleted file mode 100644
index 71980db50..000000000
--- a/vendor/modernc.org/mathutil/envelope.go
+++ /dev/null
@@ -1,46 +0,0 @@
-// Copyright (c) 2014 The mathutil Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package mathutil // import "modernc.org/mathutil"
-
-import (
-	"math"
-)
-
-// Approximation type determines approximation methods used by e.g. Envelope.
-type Approximation int
-
-// Specific approximation method tags
-const (
-	_          Approximation = iota
-	Linear                   // As named
-	Sinusoidal               // Smooth for all derivations
-)
-
-// Envelope is an utility for defining simple curves using a small (usually)
-// set of data points.  Envelope returns a value defined by x, points and
-// approximation.  The value of x must be in [0,1) otherwise the result is
-// undefined or the function may panic. Points are interpreted as dividing the
-// [0,1) interval in len(points)-1 sections, so len(points) must be > 1 or the
-// function may panic. According to the left and right points closing/adjacent
-// to the section the resulting value is interpolated using the chosen
-// approximation method.  Unsupported values of approximation are silently
-// interpreted as 'Linear'.
-func Envelope(x float64, points []float64, approximation Approximation) float64 {
-	step := 1 / float64(len(points)-1)
-	fslot := math.Floor(x / step)
-	mod := x - fslot*step
-	slot := int(fslot)
-	l, r := points[slot], points[slot+1]
-	rmod := mod / step
-	switch approximation {
-	case Sinusoidal:
-		k := (math.Sin(math.Pi*(rmod-0.5)) + 1) / 2
-		return l + (r-l)*k
-	case Linear:
-		fallthrough
-	default:
-		return l + (r-l)*rmod
-	}
-}