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rui/angleUnit.go

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package rui
import (
"fmt"
"math"
"strconv"
"strings"
)
// AngleUnitType : type of enumerated constants for define a type of AngleUnit value.
// Can take the following values: Radian, Degree, Gradian, and Turn
type AngleUnitType uint8
const (
// Radian - angle in radians
Radian AngleUnitType = 0
// Radian - angle in radians * π
PiRadian AngleUnitType = 1
// Degree - angle in degrees
Degree AngleUnitType = 2
// Gradian - angle in gradian (1400 of a full circle)
Gradian AngleUnitType = 3
// Turn - angle in turns (1 turn = 360 degree)
Turn AngleUnitType = 4
)
// AngleUnit describe a size (Value field) and size unit (Type field).
type AngleUnit struct {
Type AngleUnitType
Value float64
}
// Deg creates AngleUnit with Degree type
func Deg(value float64) AngleUnit {
return AngleUnit{Type: Degree, Value: value}
}
// Rad create AngleUnit with Radian type
func Rad(value float64) AngleUnit {
return AngleUnit{Type: Radian, Value: value}
}
// PiRad create AngleUnit with PiRadian type
func PiRad(value float64) AngleUnit {
return AngleUnit{Type: PiRadian, Value: value}
}
// Grad create AngleUnit with Gradian type
func Grad(value float64) AngleUnit {
return AngleUnit{Type: Gradian, Value: value}
}
// Equal compare two AngleUnit. Return true if AngleUnit are equal
func (angle AngleUnit) Equal(size2 AngleUnit) bool {
return angle.Type == size2.Type && angle.Value == size2.Value
}
func angleUnitSuffixes() map[AngleUnitType]string {
return map[AngleUnitType]string{
Degree: "deg",
Radian: "rad",
PiRadian: "pi",
Gradian: "grad",
Turn: "turn",
}
}
// StringToAngleUnit converts the string argument to AngleUnit
func StringToAngleUnit(value string) (AngleUnit, bool) {
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angle, err := stringToAngleUnit(value)
if err != nil {
ErrorLog(err.Error())
return angle, false
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}
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return angle, true
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}
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func stringToAngleUnit(value string) (AngleUnit, error) {
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value = strings.ToLower(strings.Trim(value, " \t\n\r"))
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setValue := func(suffix string, unitType AngleUnitType) (AngleUnit, error) {
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val, err := strconv.ParseFloat(value[:len(value)-len(suffix)], 64)
if err != nil {
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return AngleUnit{}, err
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}
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return AngleUnit{Value: val, Type: unitType}, nil
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}
if value == "π" {
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return AngleUnit{Value: 1, Type: PiRadian}, nil
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}
if strings.HasSuffix(value, "π") {
return setValue("π", PiRadian)
}
if strings.HasSuffix(value, "°") {
return setValue("°", Degree)
}
for unitType, suffix := range angleUnitSuffixes() {
if strings.HasSuffix(value, suffix) {
return setValue(suffix, unitType)
}
}
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val, err := strconv.ParseFloat(value, 64)
if err != nil {
return AngleUnit{}, err
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}
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return AngleUnit{Value: val, Type: Radian}, nil
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}
// String - convert AngleUnit to string
func (angle AngleUnit) String() string {
if suffix, ok := angleUnitSuffixes()[angle.Type]; ok {
return fmt.Sprintf("%g%s", angle.Value, suffix)
}
return fmt.Sprintf("%g", angle.Value)
}
// cssString - convert AngleUnit to string
func (angle AngleUnit) cssString() string {
if angle.Type == PiRadian {
return fmt.Sprintf("%grad", angle.Value*math.Pi)
}
return angle.String()
}
// ToDegree returns the angle in radians
func (angle AngleUnit) ToRadian() AngleUnit {
switch angle.Type {
case PiRadian:
return AngleUnit{Value: angle.Value * math.Pi, Type: Radian}
case Degree:
return AngleUnit{Value: angle.Value * math.Pi / 180, Type: Radian}
case Gradian:
return AngleUnit{Value: angle.Value * math.Pi / 200, Type: Radian}
case Turn:
return AngleUnit{Value: angle.Value * 2 * math.Pi, Type: Radian}
}
return angle
}
// ToDegree returns the angle in degrees
func (angle AngleUnit) ToDegree() AngleUnit {
switch angle.Type {
case Radian:
return AngleUnit{Value: angle.Value * 180 / math.Pi, Type: Degree}
case PiRadian:
return AngleUnit{Value: angle.Value * 180, Type: Degree}
case Gradian:
return AngleUnit{Value: angle.Value * 360 / 400, Type: Degree}
case Turn:
return AngleUnit{Value: angle.Value * 360, Type: Degree}
}
return angle
}
// ToGradian returns the angle in gradians (1400 of a full circle)
func (angle AngleUnit) ToGradian() AngleUnit {
switch angle.Type {
case Radian:
return AngleUnit{Value: angle.Value * 200 / math.Pi, Type: Gradian}
case PiRadian:
return AngleUnit{Value: angle.Value * 200, Type: Gradian}
case Degree:
return AngleUnit{Value: angle.Value * 400 / 360, Type: Gradian}
case Turn:
return AngleUnit{Value: angle.Value * 400, Type: Gradian}
}
return angle
}
// ToTurn returns the angle in turns (1 turn = 360 degree)
func (angle AngleUnit) ToTurn() AngleUnit {
switch angle.Type {
case Radian:
return AngleUnit{Value: angle.Value / (2 * math.Pi), Type: Turn}
case PiRadian:
return AngleUnit{Value: angle.Value / 2, Type: Turn}
case Degree:
return AngleUnit{Value: angle.Value / 360, Type: Turn}
case Gradian:
return AngleUnit{Value: angle.Value / 400, Type: Turn}
}
return angle
}