github.com/jingcheng-WU/gonum@v0.9.1-0.20210323123734-f1a2a11a8f7b/unit/mass.go (about)

     1  // Code generated by "go generate github.com/jingcheng-WU/gonum/unit”; DO NOT EDIT.
     2  
     3  // Copyright ©2014 The Gonum Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  package unit
     8  
     9  import (
    10  	"errors"
    11  	"fmt"
    12  	"math"
    13  	"unicode/utf8"
    14  )
    15  
    16  // Mass represents a mass in kilograms.
    17  type Mass float64
    18  
    19  const (
    20  	Gram Mass = 1e-3
    21  
    22  	Kilogram = Kilo * Gram
    23  )
    24  
    25  // Unit converts the Mass to a *Unit.
    26  func (m Mass) Unit() *Unit {
    27  	return New(float64(m), Dimensions{
    28  		MassDim: 1,
    29  	})
    30  }
    31  
    32  // Mass allows Mass to implement a Masser interface.
    33  func (m Mass) Mass() Mass {
    34  	return m
    35  }
    36  
    37  // From converts the unit into the receiver. From returns an
    38  // error if there is a mismatch in dimension.
    39  func (m *Mass) From(u Uniter) error {
    40  	if !DimensionsMatch(u, Gram) {
    41  		*m = Mass(math.NaN())
    42  		return errors.New("unit: dimension mismatch")
    43  	}
    44  	*m = Mass(u.Unit().Value())
    45  	return nil
    46  }
    47  
    48  func (m Mass) Format(fs fmt.State, c rune) {
    49  	switch c {
    50  	case 'v':
    51  		if fs.Flag('#') {
    52  			fmt.Fprintf(fs, "%T(%v)", m, float64(m))
    53  			return
    54  		}
    55  		fallthrough
    56  	case 'e', 'E', 'f', 'F', 'g', 'G':
    57  		p, pOk := fs.Precision()
    58  		w, wOk := fs.Width()
    59  		const unit = " kg"
    60  		switch {
    61  		case pOk && wOk:
    62  			fmt.Fprintf(fs, "%*.*"+string(c), pos(w-utf8.RuneCount([]byte(unit))), p, float64(m))
    63  		case pOk:
    64  			fmt.Fprintf(fs, "%.*"+string(c), p, float64(m))
    65  		case wOk:
    66  			fmt.Fprintf(fs, "%*"+string(c), pos(w-utf8.RuneCount([]byte(unit))), float64(m))
    67  		default:
    68  			fmt.Fprintf(fs, "%"+string(c), float64(m))
    69  		}
    70  		fmt.Fprint(fs, unit)
    71  	default:
    72  		fmt.Fprintf(fs, "%%!%c(%T=%g kg)", c, m, float64(m))
    73  	}
    74  }