point_vector_test.go

Documentation: github.com/golang/geo/s2

     1  // Copyright 2017 Google Inc. All rights reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package s2
    16  
    17  import (
    18  	"math/rand"
    19  	"testing"
    20  )
    21  
    22  func TestPointVectorEmpty(t *testing.T) {
    23  	var shape PointVector
    24  
    25  	if got, want := shape.NumEdges(), 0; got != want {
    26  		t.Errorf("shape.NumEdges() = %v, want %v", got, want)
    27  	}
    28  	if got, want := shape.NumChains(), 0; got != want {
    29  		t.Errorf("shape.NumChains() = %v, want %v", got, want)
    30  	}
    31  	if got, want := shape.Dimension(), 0; got != want {
    32  		t.Errorf("shape.Dimension() = %v, want %v", got, want)
    33  	}
    34  	if !shape.IsEmpty() {
    35  		t.Errorf("shape.IsEmpty() = false, want true")
    36  	}
    37  	if shape.IsFull() {
    38  		t.Errorf("shape.IsFull() = true, want false")
    39  	}
    40  	if shape.ReferencePoint().Contained {
    41  		t.Errorf("shape.ReferencePoint().Contained = true, want false")
    42  	}
    43  }
    44  
    45  func TestPointVectorBasics(t *testing.T) {
    46  	const seed = 8675309
    47  	rand.Seed(seed)
    48  
    49  	const numPoints = 100
    50  	var p PointVector = make([]Point, numPoints)
    51  
    52  	for i := 0; i < numPoints; i++ {
    53  		p[i] = randomPoint()
    54  	}
    55  
    56  	shape := Shape(&p)
    57  	if got, want := shape.NumEdges(), numPoints; got != want {
    58  		t.Errorf("shape.NumEdges() = %v, want %v", got, want)
    59  	}
    60  	if got, want := shape.NumChains(), numPoints; got != want {
    61  		t.Errorf("shape.NumChains() = %v, want %v", got, want)
    62  	}
    63  	if got, want := shape.Dimension(), 0; got != want {
    64  		t.Errorf("shape.Dimension() = %v, want %v", got, want)
    65  	}
    66  	if shape.IsEmpty() {
    67  		t.Errorf("shape.IsEmpty() = true, want false")
    68  	}
    69  	if shape.IsFull() {
    70  		t.Errorf("shape.IsFull() = true, want false")
    71  	}
    72  
    73  	rand.Seed(seed)
    74  	for i := 0; i < numPoints; i++ {
    75  		if got, want := shape.Chain(i).Start, i; got != want {
    76  			t.Errorf("shape.Chain(%d).Start = %d, want %d", i, got, want)
    77  		}
    78  		if got, want := shape.Chain(i).Length, 1; got != want {
    79  			t.Errorf("shape.Chain(%d).Length = %v, want %d", i, got, want)
    80  		}
    81  		edge := shape.Edge(i)
    82  		pt := randomPoint()
    83  
    84  		if !pt.ApproxEqual(edge.V0) {
    85  			t.Errorf("shape.Edge(%d).V0 = %v, want %v", i, edge.V0, pt)
    86  		}
    87  		if !pt.ApproxEqual(edge.V1) {
    88  			t.Errorf("shape.Edge(%d).V1 = %v, want %v", i, edge.V1, pt)
    89  		}
    90  	}
    91  }
    92
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