github.com/richardwilkes/toolbox@v1.121.0/xmath/geom/visibility/endpoint.go (about)

     1  // Copyright (c) 2016-2024 by Richard A. Wilkes. All rights reserved.
     2  //
     3  // This Source Code Form is subject to the terms of the Mozilla Public
     4  // License, version 2.0. If a copy of the MPL was not distributed with
     5  // this file, You can obtain one at http://mozilla.org/MPL/2.0/.
     6  //
     7  // This Source Code Form is "Incompatible With Secondary Licenses", as
     8  // defined by the Mozilla Public License, version 2.0.
     9  
    10  package visibility
    11  
    12  import (
    13  	"github.com/richardwilkes/toolbox/xmath/geom"
    14  	"golang.org/x/exp/constraints"
    15  )
    16  
    17  type endPoint[T constraints.Float] struct {
    18  	angle        T
    19  	segmentIndex int
    20  	start        bool
    21  }
    22  
    23  func (ep *endPoint[T]) pt(segments []Segment[T]) geom.Point[T] {
    24  	if ep.start {
    25  		return segments[ep.segmentIndex].Start
    26  	}
    27  	return segments[ep.segmentIndex].End
    28  }