F# logo generator

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#if INTERACTIVE
#r "System.Drawing.dll"
#endif

open System.Drawing

let drawRect (xPos,yPos,height,direction,col) scale (bm:Bitmap) =
  let rec loop x y d i =
    for z = min (xPos*scale) x to (max (xPos*scale) x) - 1 do bm.SetPixel(z,y,Color.FromArgb(col))
    if i = 0 then bm
    elif i = ((height*scale) / 2) + 1
    then loop (x + d) (y + 1) (0 - d) (i - 1)
    else loop (x + d) (y + 1) d (i - 1)
  loop (xPos*scale) (yPos*scale) direction (height*scale)

let scale = 18
let size = 29 * scale
let back,dark,light = 0x0,0xff378bba,0xff30b9db
let image =
  [(14,0,28,-1,dark);(14,7,14,-1,back);(14,9,10,-1,dark);(15,0,28,1,light);(15,7,14,1,back)]
  |> List.fold (fun bm c -> drawRect c scale bm) (new Bitmap(size, size))

image.Save("fslogo.png", Imaging.ImageFormat.Png)

namespace System

namespace System.Drawing

val drawRect : xPos:int * yPos:int * height:int * direction:int * col:int -> scale:int -> bm:Bitmap -> Bitmap

Full name: Script.drawRect

val xPos : int

val yPos : int

val height : int

val direction : int

val col : int

val scale : int

val bm : Bitmap

Multiple items
type Bitmap =
  inherit Image
  new : filename:string -> Bitmap + 11 overloads
  member Clone : rect:Rectangle * format:PixelFormat -> Bitmap + 1 overload
  member GetHbitmap : unit -> nativeint + 1 overload
  member GetHicon : unit -> nativeint
  member GetPixel : x:int * y:int -> Color
  member LockBits : rect:Rectangle * flags:ImageLockMode * format:PixelFormat -> BitmapData + 1 overload
  member MakeTransparent : unit -> unit + 1 overload
  member SetPixel : x:int * y:int * color:Color -> unit
  member SetResolution : xDpi:float32 * yDpi:float32 -> unit
  member UnlockBits : bitmapdata:BitmapData -> unit
  ...

Full name: System.Drawing.Bitmap

--------------------
Bitmap(filename: string) : unit
   (+0 other overloads)
Bitmap(stream: System.IO.Stream) : unit
   (+0 other overloads)
Bitmap(original: Image) : unit
   (+0 other overloads)
Bitmap(filename: string, useIcm: bool) : unit
   (+0 other overloads)
Bitmap(type: System.Type, resource: string) : unit
   (+0 other overloads)
Bitmap(stream: System.IO.Stream, useIcm: bool) : unit
   (+0 other overloads)
Bitmap(width: int, height: int) : unit
   (+0 other overloads)
Bitmap(original: Image, newSize: Size) : unit
   (+0 other overloads)
Bitmap(width: int, height: int, format: Imaging.PixelFormat) : unit
   (+0 other overloads)
Bitmap(width: int, height: int, g: Graphics) : unit
   (+0 other overloads)

val loop : (int -> int -> int -> int -> Bitmap)

val x : int

val y : int

val d : int

val i : int

val z : int

val min : e1:'T -> e2:'T -> 'T (requires comparison)

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

val max : e1:'T -> e2:'T -> 'T (requires comparison)

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

Bitmap.SetPixel(x: int, y: int, color: Color) : unit

type Color =
  struct
    member A : byte
    member B : byte
    member Equals : obj:obj -> bool
    member G : byte
    member GetBrightness : unit -> float32
    member GetHashCode : unit -> int
    member GetHue : unit -> float32
    member GetSaturation : unit -> float32
    member IsEmpty : bool
    member IsKnownColor : bool
    ...
  end

Full name: System.Drawing.Color

Color.FromArgb(argb: int) : Color
Color.FromArgb(alpha: int, baseColor: Color) : Color
Color.FromArgb(red: int, green: int, blue: int) : Color
Color.FromArgb(alpha: int, red: int, green: int, blue: int) : Color

val scale : int

Full name: Script.scale

val size : int

Full name: Script.size

val back : int

Full name: Script.back

val dark : int

Full name: Script.dark

val light : int

Full name: Script.light

val image : Bitmap

Full name: Script.image

Multiple items
module List

from Microsoft.FSharp.Collections

--------------------
type List<'T> =
  | ( [] )
  | ( :: ) of Head: 'T * Tail: 'T list
  interface IEnumerable
  interface IEnumerable<'T>
  member Head : 'T
  member IsEmpty : bool
  member Item : index:int -> 'T with get
  member Length : int
  member Tail : 'T list
  static member Cons : head:'T * tail:'T list -> 'T list
  static member Empty : 'T list

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

val fold : folder:('State -> 'T -> 'State) -> state:'State -> list:'T list -> 'State

Full name: Microsoft.FSharp.Collections.List.fold

val c : int * int * int * int * int

Image.Save(filename: string) : unit
Image.Save(stream: System.IO.Stream, format: Imaging.ImageFormat) : unit
Image.Save(filename: string, format: Imaging.ImageFormat) : unit
Image.Save(stream: System.IO.Stream, encoder: Imaging.ImageCodecInfo, encoderParams: Imaging.EncoderParameters) : unit
Image.Save(filename: string, encoder: Imaging.ImageCodecInfo, encoderParams: Imaging.EncoderParameters) : unit

namespace System.Drawing.Imaging

Multiple items
type ImageFormat =
  new : guid:Guid -> ImageFormat
  member Equals : o:obj -> bool
  member GetHashCode : unit -> int
  member Guid : Guid
  member ToString : unit -> string
  static member Bmp : ImageFormat
  static member Emf : ImageFormat
  static member Exif : ImageFormat
  static member Gif : ImageFormat
  static member Icon : ImageFormat
  ...

Full name: System.Drawing.Imaging.ImageFormat

--------------------
Imaging.ImageFormat(guid: System.Guid) : unit

property Imaging.ImageFormat.Png: Imaging.ImageFormat