50 lines
1.6 KiB
Go
50 lines
1.6 KiB
Go
// Copyright 2017 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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package pipoint
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import (
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"fmt"
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"math"
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"testing"
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"github.com/stretchr/testify/assert"
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)
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func TestLatLength(t *testing.T) {
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// Test vectors from https://en.wikipedia.org/wiki/Latitude
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assert.InDelta(t, LatLength(0*math.Pi/180), 110574, 1)
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assert.InDelta(t, LatLength(15*math.Pi/180), 110649, 1)
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assert.InDelta(t, LatLength(30*math.Pi/180), 110852, 1)
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assert.InDelta(t, LatLength(45*math.Pi/180), 111132, 1)
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assert.InDelta(t, LatLength(60*math.Pi/180), 111412, 1)
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assert.InDelta(t, LatLength(75*math.Pi/180), 111618, 1)
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}
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func TestLonLength(t *testing.T) {
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// Test vectors from https://en.wikipedia.org/wiki/Latitude
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assert.InDelta(t, LonLength(0*math.Pi/180), 111320, 1)
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assert.InDelta(t, LonLength(15*math.Pi/180), 107550, 1)
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assert.InDelta(t, LonLength(30*math.Pi/180), 96486, 1)
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assert.InDelta(t, LonLength(45*math.Pi/180), 78847, 1)
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assert.InDelta(t, LonLength(60*math.Pi/180), 55800, 1)
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assert.InDelta(t, LonLength(75*math.Pi/180), 28902, 1)
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}
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func ExampleLatLength() {
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fmt.Println(int(LatLength(46.8 * math.Pi / 180)))
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// Output: 111166
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}
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