point_vector.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  // Shape interface enforcement
    18  var (
    19  	_ Shape = (*PointVector)(nil)
    20  )
    21  
    22  // PointVector is a Shape representing a set of Points. Each point
    23  // is represented as a degenerate edge with the same starting and ending
    24  // vertices.
    25  //
    26  // This type is useful for adding a collection of points to an ShapeIndex.
    27  //
    28  // Its methods are on *PointVector due to implementation details of ShapeIndex.
    29  type PointVector []Point
    30  
    31  func (p *PointVector) NumEdges() int                     { return len(*p) }
    32  func (p *PointVector) Edge(i int) Edge                   { return Edge{(*p)[i], (*p)[i]} }
    33  func (p *PointVector) ReferencePoint() ReferencePoint    { return OriginReferencePoint(false) }
    34  func (p *PointVector) NumChains() int                    { return len(*p) }
    35  func (p *PointVector) Chain(i int) Chain                 { return Chain{i, 1} }
    36  func (p *PointVector) ChainEdge(i, j int) Edge           { return Edge{(*p)[i], (*p)[j]} }
    37  func (p *PointVector) ChainPosition(e int) ChainPosition { return ChainPosition{e, 0} }
    38  func (p *PointVector) Dimension() int                    { return 0 }
    39  func (p *PointVector) IsEmpty() bool                     { return defaultShapeIsEmpty(p) }
    40  func (p *PointVector) IsFull() bool                      { return defaultShapeIsFull(p) }
    41  func (p *PointVector) typeTag() typeTag                  { return typeTagPointVector }
    42  func (p *PointVector) privateInterface()                 {}
    43
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