citygrid

README

citygrid

Build an image of a city from a list of addresses using Go

Addresses

Various cities and the sources of their data.

Denver

From data.denvergov.org, found through data.opencolorado.org

Documentation

Index

• Variables
• func HSLToRGB(h, s, l float64) (r, g, b uint8)
• func HSVToRGB(h, s, v float64) (r, g, b uint8)
• func Image(width, height, pixel int, freq Frequency) *image.RGBA
• func RGBToHSL(r, g, b uint8) (h, s, l float64)
• func RGBToHSV(r, g, b uint8) (h, s, v float64)
• type Frequency
  • func CreateFrequency(h *Histogram, index int) Frequency
  • func CreateMaxFrequency(h *Histogram) Frequency
• type HSL
  • func (c HSL) RGBA() (uint32, uint32, uint32, uint32)
• type HSV
  • func (c HSV) RGBA() (uint32, uint32, uint32, uint32)
• type Histogram
  • func AutoHeightHistogram(width int, extrema Rect) *Histogram
  • func (h *Histogram) CountLocations(locations []Location)
• type Location
• type LocationParser
• type Rect
  • func Extrema(minX, minY, maxX, maxY float64) (rect Rect)
  • func LocationExtrema(locations []Location) (rect Rect)
  • func LocationExtrema999(locations []Location) (rect Rect)
  • func LocationExtrema9999(locations []Location) (rect Rect)
• type Simple
  • func (s Simple) LatLong() (float64, float64)

Variables

var HSLModel = color.ModelFunc(hslModel)

HSLModel converts any color.Color to a HSL color.

var HSVModel = color.ModelFunc(hsvModel)

HSVModel converts any color.Color to a HSV color.

Functions

func HSLToRGB

func HSLToRGB(h, s, l float64) (r, g, b uint8)

HSLToRGB converts an HSL triple to a RGB triple.

Ported from http://goo.gl/Vg1h9

func HSVToRGB

func HSVToRGB(h, s, v float64) (r, g, b uint8)

HSVToRGB converts an HSV triple to a RGB triple.

Ported from http://goo.gl/Vg1h9

func Image

func Image(width, height, pixel int, freq Frequency) *image.RGBA

func RGBToHSL

func RGBToHSL(r, g, b uint8) (h, s, l float64)

RGBToHSL converts an RGB triple to a HSL triple.

Ported from http://goo.gl/Vg1h9

func RGBToHSV

func RGBToHSV(r, g, b uint8) (h, s, v float64)

RGBToHSV converts an RGB triple to a HSV triple.

Ported from http://goo.gl/Vg1h9

Types

type Frequency

type Frequency []float64

func CreateFrequency

func CreateFrequency(h *Histogram, index int) Frequency

func CreateMaxFrequency

func CreateMaxFrequency(h *Histogram) Frequency

type HSL

type HSL struct {
	H, S, L float64
}

HSL represents a cylindrical coordinate of points in an RGB color model.

Values are in the range 0 to 1.

func (HSL) RGBA

func (c HSL) RGBA() (uint32, uint32, uint32, uint32)

RGBA returns the alpha-premultiplied red, green, blue and alpha values for the HSL.

type HSV

type HSV struct {
	H, S, V float64
}

HSV represents a cylindrical coordinate of points in an RGB color model.

Values are in the range 0 to 1.

func (HSV) RGBA

func (c HSV) RGBA() (uint32, uint32, uint32, uint32)

RGBA returns the alpha-premultiplied red, green, blue and alpha values for the HSV.

type Histogram

type Histogram struct {
	Width  int
	Height int
	Blocks [][]int
	// contains filtered or unexported fields
}

func AutoHeightHistogram

func AutoHeightHistogram(width int, extrema Rect) *Histogram

Uses the ratio of latitude and longitude at 45 deg N/S

func (*Histogram) CountLocations

func (h *Histogram) CountLocations(locations []Location)

type Location

type Location interface {
	LatLong() (float64, float64)
}

All we need from addresses is their latitude and longitude

type LocationParser

type LocationParser interface {
	Parse(*os.File) ([]Location, error)
}

Given a file of addresses, return a list of locations

type Rect

type Rect struct {
	// contains filtered or unexported fields
}

func Extrema

func Extrema(minX, minY, maxX, maxY float64) (rect Rect)

func LocationExtrema

func LocationExtrema(locations []Location) (rect Rect)

func LocationExtrema999

func LocationExtrema999(locations []Location) (rect Rect)

func LocationExtrema9999

func LocationExtrema9999(locations []Location) (rect Rect)

type Simple

type Simple struct {
	Latitude  float64
	Longitude float64
}

A simple implementation of the location interface

func (Simple) LatLong

func (s Simple) LatLong() (float64, float64)