Simple console bar chart

Creates a simple bar chart from a list consisting of a tuple (title:string * value:'a).

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type Width =
    /// Use the full width of the console
    | FullWidth
    /// The width of the chart including the printed title and value
    | Width of int
    member self.Value =
        match self with
        | FullWidth -> System.Console.WindowWidth
        | Width value -> value

// based on: https://www.daniweb.com/programming/software-development/code/238532/very-simple-console-barchart
let inline drawBarChartWith (width: Width) valueFormatter (xs: (string * 'a) seq) =
    let xs = xs |> Seq.cache
    // calculate maximum of the data
    let maxTitleWidth = xs |> Seq.map (fst >> String.length) |> Seq.max
    let maxValue = xs |> Seq.map snd |> Seq.max
    let maxValueWidth = xs |> Seq.map (snd >> valueFormatter >> String.length) |> Seq.max
    // use full width of console
    let factor = float (width.Value - maxTitleWidth - maxValueWidth - 3)
    // draw chart
    let emptyTitle = String.replicate maxTitleWidth " "
    let emptyValue = String.replicate maxValueWidth " "
    printfn "%s│%s│" emptyTitle emptyValue
    for (title, value) in xs do
        let paddedTitle = (string title).PadLeft(maxTitleWidth)
        let width = int (float value / float maxValue * factor)
        let value = (valueFormatter value).PadLeft(maxValueWidth)
        let segments = String.replicate width "■"
        printfn "%s│%s│%s" paddedTitle value segments
    printfn "%s│%s│" emptyTitle emptyValue

let inline drawBarChart xs =
    drawBarChartWith FullWidth string xs

union case Width.FullWidth: Width

Use the full width of the console

Multiple items
union case Width.Width: int -> Width

The width of the chart including the printed title and value

--------------------
type Width =
  | FullWidth
  | Width of int
  member Value : int

Full name: Script.Width

Multiple items
val int : value:'T -> int (requires member op_Explicit)

Full name: Microsoft.FSharp.Core.Operators.int

--------------------
type int = int32

Full name: Microsoft.FSharp.Core.int

--------------------
type int<'Measure> = int

Full name: Microsoft.FSharp.Core.int<_>

val self : Width

member Width.Value : int

Full name: Script.Width.Value

namespace System

type Console =
  static member BackgroundColor : ConsoleColor with get, set
  static member Beep : unit -> unit + 1 overload
  static member BufferHeight : int with get, set
  static member BufferWidth : int with get, set
  static member CapsLock : bool
  static member Clear : unit -> unit
  static member CursorLeft : int with get, set
  static member CursorSize : int with get, set
  static member CursorTop : int with get, set
  static member CursorVisible : bool with get, set
  ...

Full name: System.Console

property System.Console.WindowWidth: int

val value : int

val drawBarChartWith : width:Width -> valueFormatter:('a -> string) -> xs:seq<string * 'a> -> unit (requires comparison and member op_Explicit)

Full name: Script.drawBarChartWith

val width : Width

val valueFormatter : ('a -> string) (requires comparison and member op_Explicit)

val xs : seq<string * 'a> (requires comparison and member op_Explicit)

Multiple items
val string : value:'T -> string

Full name: Microsoft.FSharp.Core.Operators.string

--------------------
type string = System.String

Full name: Microsoft.FSharp.Core.string

Multiple items
val seq : sequence:seq<'T> -> seq<'T>

Full name: Microsoft.FSharp.Core.Operators.seq

--------------------
type seq<'T> = System.Collections.Generic.IEnumerable<'T>

Full name: Microsoft.FSharp.Collections.seq<_>

module Seq

from Microsoft.FSharp.Collections

val cache : source:seq<'T> -> seq<'T>

Full name: Microsoft.FSharp.Collections.Seq.cache

val maxTitleWidth : int

val map : mapping:('T -> 'U) -> source:seq<'T> -> seq<'U>

Full name: Microsoft.FSharp.Collections.Seq.map

val fst : tuple:('T1 * 'T2) -> 'T1

Full name: Microsoft.FSharp.Core.Operators.fst

module String

from Microsoft.FSharp.Core

val length : str:string -> int

Full name: Microsoft.FSharp.Core.String.length

val max : source:seq<'T> -> 'T (requires comparison)

Full name: Microsoft.FSharp.Collections.Seq.max

val maxValue : 'a (requires comparison and member op_Explicit)

val snd : tuple:('T1 * 'T2) -> 'T2

Full name: Microsoft.FSharp.Core.Operators.snd

val maxValueWidth : int

val factor : float

Multiple items
val float : value:'T -> float (requires member op_Explicit)

Full name: Microsoft.FSharp.Core.Operators.float

--------------------
type float = System.Double

Full name: Microsoft.FSharp.Core.float

--------------------
type float<'Measure> = float

Full name: Microsoft.FSharp.Core.float<_>

property Width.Value: int

val emptyTitle : string

val replicate : count:int -> str:string -> string

Full name: Microsoft.FSharp.Core.String.replicate

val emptyValue : string

val printfn : format:Printf.TextWriterFormat<'T> -> 'T

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.printfn

val title : string

val value : 'a (requires comparison and member op_Explicit)

val paddedTitle : string

val width : int

val value : string

val segments : string

val drawBarChart : xs:seq<string * 'a> -> unit (requires comparison and member op_Explicit)

Full name: Script.drawBarChart

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More information

Link:	http://fssnip.net/7UB
Posted:	6 years ago
Author:	Tobias Burger
Tags:	#console , #chart , #barchart