Grand test fixup (#138)

* start fixing up tests

* fix up tests + automate with drone

* fiddle with linting

* messing about with drone.yml

* some more fiddling

* hmmm

* add cache

* add vendor directory

* verbose

* ci updates

* update some little things

* update sig

1 files changed, 198 insertions, 0 deletions

diff --git a/vendor/github.com/golang/geo/r3/precisevector.go b/vendor/github.com/golang/geo/r3/precisevector.go
new file mode 100644
index 000000000..b13393dbc
--- /dev/null
+++ b/vendor/github.com/golang/geo/r3/precisevector.go
@@ -0,0 +1,198 @@
+// Copyright 2016 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package r3
+
+import (
+	"fmt"
+	"math/big"
+)
+
+const (
+	// prec is the number of bits of precision to use for the Float values.
+	// To keep things simple, we use the maximum allowable precision on big
+	// values. This allows us to handle all values we expect in the s2 library.
+	prec = big.MaxPrec
+)
+
+// define some commonly referenced values.
+var (
+	precise0 = precInt(0)
+	precise1 = precInt(1)
+)
+
+// precStr wraps the conversion from a string into a big.Float. For results that
+// actually can be represented exactly, this should only be used on values that
+// are integer multiples of integer powers of 2.
+func precStr(s string) *big.Float {
+	// Explicitly ignoring the bool return for this usage.
+	f, _ := new(big.Float).SetPrec(prec).SetString(s)
+	return f
+}
+
+func precInt(i int64) *big.Float {
+	return new(big.Float).SetPrec(prec).SetInt64(i)
+}
+
+func precFloat(f float64) *big.Float {
+	return new(big.Float).SetPrec(prec).SetFloat64(f)
+}
+
+func precAdd(a, b *big.Float) *big.Float {
+	return new(big.Float).SetPrec(prec).Add(a, b)
+}
+
+func precSub(a, b *big.Float) *big.Float {
+	return new(big.Float).SetPrec(prec).Sub(a, b)
+}
+
+func precMul(a, b *big.Float) *big.Float {
+	return new(big.Float).SetPrec(prec).Mul(a, b)
+}
+
+// PreciseVector represents a point in ℝ³ using high-precision values.
+// Note that this is NOT a complete implementation because there are some
+// operations that Vector supports that are not feasible with arbitrary precision
+// math. (e.g., methods that need division like Normalize, or methods needing a
+// square root operation such as Norm)
+type PreciseVector struct {
+	X, Y, Z *big.Float
+}
+
+// PreciseVectorFromVector creates a high precision vector from the given Vector.
+func PreciseVectorFromVector(v Vector) PreciseVector {
+	return NewPreciseVector(v.X, v.Y, v.Z)
+}
+
+// NewPreciseVector creates a high precision vector from the given floating point values.
+func NewPreciseVector(x, y, z float64) PreciseVector {
+	return PreciseVector{
+		X: precFloat(x),
+		Y: precFloat(y),
+		Z: precFloat(z),
+	}
+}
+
+// Vector returns this precise vector converted to a Vector.
+func (v PreciseVector) Vector() Vector {
+	// The accuracy flag is ignored on these conversions back to float64.
+	x, _ := v.X.Float64()
+	y, _ := v.Y.Float64()
+	z, _ := v.Z.Float64()
+	return Vector{x, y, z}.Normalize()
+}
+
+// Equal reports whether v and ov are equal.
+func (v PreciseVector) Equal(ov PreciseVector) bool {
+	return v.X.Cmp(ov.X) == 0 && v.Y.Cmp(ov.Y) == 0 && v.Z.Cmp(ov.Z) == 0
+}
+
+func (v PreciseVector) String() string {
+	return fmt.Sprintf("(%10g, %10g, %10g)", v.X, v.Y, v.Z)
+}
+
+// Norm2 returns the square of the norm.
+func (v PreciseVector) Norm2() *big.Float { return v.Dot(v) }
+
+// IsUnit reports whether this vector is of unit length.
+func (v PreciseVector) IsUnit() bool {
+	return v.Norm2().Cmp(precise1) == 0
+}
+
+// Abs returns the vector with nonnegative components.
+func (v PreciseVector) Abs() PreciseVector {
+	return PreciseVector{
+		X: new(big.Float).Abs(v.X),
+		Y: new(big.Float).Abs(v.Y),
+		Z: new(big.Float).Abs(v.Z),
+	}
+}
+
+// Add returns the standard vector sum of v and ov.
+func (v PreciseVector) Add(ov PreciseVector) PreciseVector {
+	return PreciseVector{
+		X: precAdd(v.X, ov.X),
+		Y: precAdd(v.Y, ov.Y),
+		Z: precAdd(v.Z, ov.Z),
+	}
+}
+
+// Sub returns the standard vector difference of v and ov.
+func (v PreciseVector) Sub(ov PreciseVector) PreciseVector {
+	return PreciseVector{
+		X: precSub(v.X, ov.X),
+		Y: precSub(v.Y, ov.Y),
+		Z: precSub(v.Z, ov.Z),
+	}
+}
+
+// Mul returns the standard scalar product of v and f.
+func (v PreciseVector) Mul(f *big.Float) PreciseVector {
+	return PreciseVector{
+		X: precMul(v.X, f),
+		Y: precMul(v.Y, f),
+		Z: precMul(v.Z, f),
+	}
+}
+
+// MulByFloat64 returns the standard scalar product of v and f.
+func (v PreciseVector) MulByFloat64(f float64) PreciseVector {
+	return v.Mul(precFloat(f))
+}
+
+// Dot returns the standard dot product of v and ov.
+func (v PreciseVector) Dot(ov PreciseVector) *big.Float {
+	return precAdd(precMul(v.X, ov.X), precAdd(precMul(v.Y, ov.Y), precMul(v.Z, ov.Z)))
+}
+
+// Cross returns the standard cross product of v and ov.
+func (v PreciseVector) Cross(ov PreciseVector) PreciseVector {
+	return PreciseVector{
+		X: precSub(precMul(v.Y, ov.Z), precMul(v.Z, ov.Y)),
+		Y: precSub(precMul(v.Z, ov.X), precMul(v.X, ov.Z)),
+		Z: precSub(precMul(v.X, ov.Y), precMul(v.Y, ov.X)),
+	}
+}
+
+// LargestComponent returns the axis that represents the largest component in this vector.
+func (v PreciseVector) LargestComponent() Axis {
+	t := v.Abs()
+
+	if t.X.Cmp(t.Y) > 0 {
+		if t.X.Cmp(t.Z) > 0 {
+			return XAxis
+		}
+		return ZAxis
+	}
+	if t.Y.Cmp(t.Z) > 0 {
+		return YAxis
+	}
+	return ZAxis
+}
+
+// SmallestComponent returns the axis that represents the smallest component in this vector.
+func (v PreciseVector) SmallestComponent() Axis {
+	t := v.Abs()
+
+	if t.X.Cmp(t.Y) < 0 {
+		if t.X.Cmp(t.Z) < 0 {
+			return XAxis
+		}
+		return ZAxis
+	}
+	if t.Y.Cmp(t.Z) < 0 {
+		return YAxis
+	}
+	return ZAxis
+}