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Draw ellipses on WPF on button click

Can be run in interactive or compiled with FSC. Cobbled together from various other snippets :)

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#r @"PresentationCore"
#r @"PresentationFramework"
#r @"WindowsBase"
#r @"System.Xaml"
#r @"UIAutomationTypes"

open System
open System.Windows
open System.Windows.Media
open System.Windows.Shapes
open System.Windows.Controls

let window = Window(Height = 400.0, Width = 400.0)
window.Title <- "Draw test"
let stackPanel = StackPanel()
window.Content <- stackPanel
stackPanel.Orientation <- Orientation.Vertical

let button1 = Button()
button1.Content <- "Click me to draw a blue ellipse"
stackPanel.Children.Add button1

let button2 = Button()
button2.Content <- "Click me to draw a red ellipse"
stackPanel.Children.Add button2

let clearButton = Button()
clearButton.Content <- "Click me to clear the canvas"
stackPanel.Children.Add clearButton

let canvas = Canvas()
canvas.Width <- window.Width
canvas.Height <- window.Height
stackPanel.Children.Add canvas

let buildEllipse height width fill stroke =
    let ellipse = Ellipse()
    ellipse.Height  <- height
    ellipse.Width   <- width
    ellipse.Fill    <- fill
    ellipse.Stroke  <- stroke
    ellipse

let ellipse1 = buildEllipse 100.0 200.0 Brushes.Aqua Brushes.Black
Canvas.SetLeft(ellipse1, canvas.Width / 10.0)
Canvas.SetTop(ellipse1, canvas.Height / 10.0)
let ellipse2 = buildEllipse 200.0 100.0 Brushes.Red Brushes.DarkViolet
Canvas.SetLeft(ellipse2, canvas.Width / 4.0)
Canvas.SetTop(ellipse2, canvas.Height / 5.0)

let addEllipseToCanvas (canvas:Canvas) (ellipse:Ellipse) =
    match canvas.Children with
    | c when c.Contains ellipse ->
        canvas.Children.Remove ellipse
        canvas.Children.Add(ellipse) |> ignore //needs to be removed and readded or the canvas complains
    | _ ->
        canvas.Children.Add(ellipse) |> ignore

button1.Click.Add(fun _ -> addEllipseToCanvas canvas ellipse1)
button2.Click.Add(fun _ -> addEllipseToCanvas canvas ellipse2)
clearButton.Click.Add(fun _ -> canvas.Children.Clear())

#if INTERACTIVE
window.Show()
#else
[<EntryPoint; STAThread>]
let main argv =
    let app = new Application()
    app.Run(window)
#endif
namespace System
namespace System.Windows
namespace System.Windows.Media
namespace System.Windows.Shapes
namespace System.Windows.Controls
val window : Window

Full name: Script.window
Multiple items
type Window =
  inherit ContentControl
  new : unit -> Window
  member Activate : unit -> bool
  member AllowsTransparency : bool with get, set
  member Close : unit -> unit
  member DialogResult : Nullable<bool> with get, set
  member DragMove : unit -> unit
  member Hide : unit -> unit
  member Icon : ImageSource with get, set
  member IsActive : bool
  member Left : float with get, set
  ...

Full name: System.Windows.Window

--------------------
Window() : unit
property Window.Title: string
val stackPanel : StackPanel

Full name: Script.stackPanel
Multiple items
type StackPanel =
  inherit Panel
  new : unit -> StackPanel
  member CanHorizontallyScroll : bool with get, set
  member CanVerticallyScroll : bool with get, set
  member ExtentHeight : float
  member ExtentWidth : float
  member HorizontalOffset : float
  member LineDown : unit -> unit
  member LineLeft : unit -> unit
  member LineRight : unit -> unit
  member LineUp : unit -> unit
  ...

Full name: System.Windows.Controls.StackPanel

--------------------
StackPanel() : unit
property ContentControl.Content: obj
property StackPanel.Orientation: Orientation
type Orientation =
  | Horizontal = 0
  | Vertical = 1

Full name: System.Windows.Controls.Orientation
field Orientation.Vertical = 1
val button1 : Button

Full name: Script.button1
Multiple items
type Button =
  inherit ButtonBase
  new : unit -> Button
  member IsCancel : bool with get, set
  member IsDefault : bool with get, set
  member IsDefaulted : bool
  static val IsDefaultProperty : DependencyProperty
  static val IsCancelProperty : DependencyProperty
  static val IsDefaultedProperty : DependencyProperty

Full name: System.Windows.Controls.Button

--------------------
Button() : unit
property Panel.Children: UIElementCollection
UIElementCollection.Add(element: UIElement) : int
val button2 : Button

Full name: Script.button2
val clearButton : Button

Full name: Script.clearButton
val canvas : Canvas

Full name: Script.canvas
Multiple items
type Canvas =
  inherit Panel
  new : unit -> Canvas
  static val LeftProperty : DependencyProperty
  static val TopProperty : DependencyProperty
  static val RightProperty : DependencyProperty
  static val BottomProperty : DependencyProperty
  static member GetBottom : element:UIElement -> float
  static member GetLeft : element:UIElement -> float
  static member GetRight : element:UIElement -> float
  static member GetTop : element:UIElement -> float
  static member SetBottom : element:UIElement * length:float -> unit
  ...

Full name: System.Windows.Controls.Canvas

--------------------
Canvas() : unit
property FrameworkElement.Width: float
property FrameworkElement.Height: float
val buildEllipse : height:float -> width:float -> fill:Brush -> stroke:Brush -> Ellipse

Full name: Script.buildEllipse
val height : float
val width : float
val fill : Brush
val stroke : Brush
val ellipse : Ellipse
Multiple items
type Ellipse =
  inherit Shape
  new : unit -> Ellipse
  member GeometryTransform : Transform
  member RenderedGeometry : Geometry

Full name: System.Windows.Shapes.Ellipse

--------------------
Ellipse() : unit
property Shape.Fill: Brush
property Shape.Stroke: Brush
val ellipse1 : Ellipse

Full name: Script.ellipse1
type Brushes =
  static member AliceBlue : SolidColorBrush
  static member AntiqueWhite : SolidColorBrush
  static member Aqua : SolidColorBrush
  static member Aquamarine : SolidColorBrush
  static member Azure : SolidColorBrush
  static member Beige : SolidColorBrush
  static member Bisque : SolidColorBrush
  static member Black : SolidColorBrush
  static member BlanchedAlmond : SolidColorBrush
  static member Blue : SolidColorBrush
  ...

Full name: System.Windows.Media.Brushes
property Brushes.Aqua: SolidColorBrush
property Brushes.Black: SolidColorBrush
Canvas.SetLeft(element: UIElement, length: float) : unit
Canvas.SetTop(element: UIElement, length: float) : unit
val ellipse2 : Ellipse

Full name: Script.ellipse2
property Brushes.Red: SolidColorBrush
property Brushes.DarkViolet: SolidColorBrush
val addEllipseToCanvas : canvas:Canvas -> ellipse:Ellipse -> unit

Full name: Script.addEllipseToCanvas
val canvas : Canvas
val c : UIElementCollection
UIElementCollection.Contains(element: UIElement) : bool
UIElementCollection.Remove(element: UIElement) : unit
val ignore : value:'T -> unit

Full name: Microsoft.FSharp.Core.Operators.ignore
event Primitives.ButtonBase.Click: IEvent<RoutedEventHandler,RoutedEventArgs>
member IObservable.Add : callback:('T -> unit) -> unit
UIElementCollection.Clear() : unit
Multiple items
type EntryPointAttribute =
  inherit Attribute
  new : unit -> EntryPointAttribute

Full name: Microsoft.FSharp.Core.EntryPointAttribute

--------------------
new : unit -> EntryPointAttribute
Multiple items
type STAThreadAttribute =
  inherit Attribute
  new : unit -> STAThreadAttribute

Full name: System.STAThreadAttribute

--------------------
STAThreadAttribute() : unit
Multiple items
type Application =
  inherit DispatcherObject
  new : unit -> Application
  member FindResource : resourceKey:obj -> obj
  member MainWindow : Window with get, set
  member Properties : IDictionary
  member Resources : ResourceDictionary with get, set
  member Run : unit -> int + 1 overload
  member Shutdown : unit -> unit + 1 overload
  member ShutdownMode : ShutdownMode with get, set
  member StartupUri : Uri with get, set
  member TryFindResource : resourceKey:obj -> obj
  ...

Full name: System.Windows.Application

--------------------
Application() : unit
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More information

Link:http://fssnip.net/7Ux
Posted:5 months ago
Author:asdf
Tags: drawing , graphics , wpf