util

Documentation

Overview

Go Language Raspberry Pi Interface
(c) Copyright David Thorpe 2016
All Rights Reserved

For Licensing and Usage information, please see LICENSE.md

PPI

These methods provide support for calculating the pixels-per-inch (PPI) of a display. The function ParseLengthString parses a string to return a diaganol length in inches. Typically you will call the function with one of the following forms:

99 in
99 mm
99 cm
99 x 99 in
99 x 99 mm
99 x 99 cm

Index

• Constants
• Variables
• func ParseLengthString(value string) (float64, error)
• type Dict
  • func CopyDict(src *Dict) *Dict
  • func NewDict(capacity uint) *Dict
  • func (this *Dict) GetBool(key string) (bool, bool)
  • func (this *Dict) GetData(key string) ([]byte, bool)
  • func (this *Dict) GetDate(key string) (time.Time, bool)
  • func (this *Dict) GetDict(key string) (*Dict, bool)
  • func (this *Dict) GetDuration(key string) (time.Duration, bool)
  • func (this *Dict) GetFloat32(key string) (float32, bool)
  • func (this *Dict) GetFloat64(key string) (float64, bool)
  • func (this *Dict) GetInt(key string) (int, bool)
  • func (this *Dict) GetString(key string) (string, bool)
  • func (this *Dict) GetUint(key string) (uint, bool)
  • func (this *Dict) IsEmpty() bool
  • func (this *Dict) Keys() []string
  • func (this *Dict) MarshalXML(e *xml.Encoder, start xml.StartElement) error
  • func (this *Dict) SetBool(key string, value bool)
  • func (this *Dict) SetData(key string, value []byte)
  • func (this *Dict) SetDate(key string, value time.Time)
  • func (this *Dict) SetDict(key string, value *Dict)
  • func (this *Dict) SetDuration(key string, value time.Duration)
  • func (this *Dict) SetFloat32(key string, value float32)
  • func (this *Dict) SetFloat64(key string, value float64)
  • func (this *Dict) SetInt(key string, value int)
  • func (this *Dict) SetString(key string, value string)
  • func (this *Dict) SetUint(key string, value uint)
  • func (this *Dict) String() string
  • func (this *Dict) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error

Constants

const (
	R_OK = 4
	W_OK = 2
	X_OK = 1
)

const (
	UNITS_IN_PER_MM float64 = 0.0393701
	UNITS_IN_PER_CM float64 = 0.393701
)

Variables

var (
	ErrUnsupportedType = errors.New("Unsupported type")
	ErrParseError      = errors.New("Syntax error in input")
)

var (
	REGEXP_PPI_D  *regexp.Regexp = regexp.MustCompile("^\\s*([0-9\\.]+)\\s*(in|mm|cm)\\s*$")
	REGEXP_PPI_WH *regexp.Regexp = regexp.MustCompile("^\\s*([0-9\\.]+)\\s*(x|X)\\s*([0-9\\.]+)\\s*(in|mm|cm)\\s*$")
)

Functions

func ParseLengthString

func ParseLengthString(value string) (float64, error)

Return the length of the diagnol, in inches. On syntax error, ErrParseError is returned. On success, the number of inches on the screen diagnanol is returned.

Types

type Dict

type Dict struct {
	// Require ability to marshall and unmarshall XML
	xml.Marshaler
	xml.Unmarshaler
	// contains filtered or unexported fields
}

Dict defines a dictionary of values, somewhat similar to Apple property lists

func CopyDict

func CopyDict(src *Dict) *Dict

CopyDict copies values from one dictionary into a new dictionary

func NewDict

func NewDict(capacity uint) *Dict

NewDict creates a new empty dictionary. Use the capacity argument to provide a hint on how many items the dictionary will contain

func (*Dict) GetBool

func (this *Dict) GetBool(key string) (bool, bool)

func (*Dict) GetData

func (this *Dict) GetData(key string) ([]byte, bool)

func (*Dict) GetDate

func (this *Dict) GetDate(key string) (time.Time, bool)

func (*Dict) GetDict

func (this *Dict) GetDict(key string) (*Dict, bool)

func (*Dict) GetDuration

func (this *Dict) GetDuration(key string) (time.Duration, bool)

func (*Dict) GetFloat32

func (this *Dict) GetFloat32(key string) (float32, bool)

func (*Dict) GetFloat64

func (this *Dict) GetFloat64(key string) (float64, bool)

func (*Dict) GetInt

func (this *Dict) GetInt(key string) (int, bool)

func (*Dict) GetString

func (this *Dict) GetString(key string) (string, bool)

func (*Dict) GetUint

func (this *Dict) GetUint(key string) (uint, bool)

func (*Dict) IsEmpty

func (this *Dict) IsEmpty() bool

func (*Dict) Keys

func (this *Dict) Keys() []string

Keys returns the keys associated with the dictionary

func (*Dict) MarshalXML

func (this *Dict) MarshalXML(e *xml.Encoder, start xml.StartElement) error

func (*Dict) SetBool

func (this *Dict) SetBool(key string, value bool)

SetBool sets bool value for key

func (*Dict) SetData

func (this *Dict) SetData(key string, value []byte)

SetData sets []byte value for key

func (*Dict) SetDate

func (this *Dict) SetDate(key string, value time.Time)

SetDate sets time.Time value for key

func (*Dict) SetDict

func (this *Dict) SetDict(key string, value *Dict)

SetDict sets dict value for key

func (*Dict) SetDuration

func (this *Dict) SetDuration(key string, value time.Duration)

SetDuration sets time.Duration value for key

func (*Dict) SetFloat32

func (this *Dict) SetFloat32(key string, value float32)

SetFloat32 sets float32 value for key

func (*Dict) SetFloat64

func (this *Dict) SetFloat64(key string, value float64)

SetFloat64 sets float64 value for key

func (*Dict) SetInt

func (this *Dict) SetInt(key string, value int)

SetInt sets int value for key

func (*Dict) SetString

func (this *Dict) SetString(key string, value string)

SetString sets string value for key

func (*Dict) SetUint

func (this *Dict) SetUint(key string, value uint)

SetUint sets uint value for key

func (*Dict) String

func (this *Dict) String() string

func (*Dict) UnmarshalXML

func (this *Dict) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error