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43 lines
2 KiB
Go
43 lines
2 KiB
Go
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// Copyright 2017 Google Inc. All rights reserved.
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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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package s2
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// Shape interface enforcement
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var (
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_ Shape = (*PointVector)(nil)
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)
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// PointVector is a Shape representing a set of Points. Each point
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// is represented as a degenerate edge with the same starting and ending
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// vertices.
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//
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// This type is useful for adding a collection of points to an ShapeIndex.
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//
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// Its methods are on *PointVector due to implementation details of ShapeIndex.
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type PointVector []Point
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func (p *PointVector) NumEdges() int { return len(*p) }
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func (p *PointVector) Edge(i int) Edge { return Edge{(*p)[i], (*p)[i]} }
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func (p *PointVector) ReferencePoint() ReferencePoint { return OriginReferencePoint(false) }
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func (p *PointVector) NumChains() int { return len(*p) }
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func (p *PointVector) Chain(i int) Chain { return Chain{i, 1} }
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func (p *PointVector) ChainEdge(i, j int) Edge { return Edge{(*p)[i], (*p)[j]} }
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func (p *PointVector) ChainPosition(e int) ChainPosition { return ChainPosition{e, 0} }
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func (p *PointVector) Dimension() int { return 0 }
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func (p *PointVector) IsEmpty() bool { return defaultShapeIsEmpty(p) }
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func (p *PointVector) IsFull() bool { return defaultShapeIsFull(p) }
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func (p *PointVector) typeTag() typeTag { return typeTagPointVector }
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func (p *PointVector) privateInterface() {}
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