util.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 "github.com/golang/geo/s1"
    18  
    19  // roundAngle returns the value rounded to nearest as an int32.
    20  // This does not match C++ exactly for the case of x.5.
    21  func roundAngle(val s1.Angle) int32 {
    22  	if val < 0 {
    23  		return int32(val - 0.5)
    24  	}
    25  	return int32(val + 0.5)
    26  }
    27  
    28  // minAngle returns the smallest of the given values.
    29  func minAngle(x s1.Angle, others ...s1.Angle) s1.Angle {
    30  	min := x
    31  	for _, y := range others {
    32  		if y < min {
    33  			min = y
    34  		}
    35  	}
    36  	return min
    37  }
    38  
    39  // maxAngle returns the largest of the given values.
    40  func maxAngle(x s1.Angle, others ...s1.Angle) s1.Angle {
    41  	max := x
    42  	for _, y := range others {
    43  		if y > max {
    44  			max = y
    45  		}
    46  	}
    47  	return max
    48  }
    49  
    50  // minChordAngle returns the smallest of the given values.
    51  func minChordAngle(x s1.ChordAngle, others ...s1.ChordAngle) s1.ChordAngle {
    52  	min := x
    53  	for _, y := range others {
    54  		if y < min {
    55  			min = y
    56  		}
    57  	}
    58  	return min
    59  }
    60  
    61  // maxChordAngle returns the largest of the given values.
    62  func maxChordAngle(x s1.ChordAngle, others ...s1.ChordAngle) s1.ChordAngle {
    63  	max := x
    64  	for _, y := range others {
    65  		if y > max {
    66  			max = y
    67  		}
    68  	}
    69  	return max
    70  }
    71  
    72  // minFloat64 returns the smallest of the given values.
    73  func minFloat64(x float64, others ...float64) float64 {
    74  	min := x
    75  	for _, y := range others {
    76  		if y < min {
    77  			min = y
    78  		}
    79  	}
    80  	return min
    81  }
    82  
    83  // maxFloat64 returns the largest of the given values.
    84  func maxFloat64(x float64, others ...float64) float64 {
    85  	max := x
    86  	for _, y := range others {
    87  		if y > max {
    88  			max = y
    89  		}
    90  	}
    91  	return max
    92  }
    93  
    94  // minInt returns the smallest of the given values.
    95  func minInt(x int, others ...int) int {
    96  	min := x
    97  	for _, y := range others {
    98  		if y < min {
    99  			min = y
   100  		}
   101  	}
   102  	return min
   103  }
   104  
   105  // maxInt returns the largest of the given values.
   106  func maxInt(x int, others ...int) int {
   107  	max := x
   108  	for _, y := range others {
   109  		if y > max {
   110  			max = y
   111  		}
   112  	}
   113  	return max
   114  }
   115  
   116  // clampInt returns the number closest to x within the range min..max.
   117  func clampInt(x, min, max int) int {
   118  	if x < min {
   119  		return min
   120  	}
   121  	if x > max {
   122  		return max
   123  	}
   124  	return x
   125  }
   126
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