WPF clock

Ruby code posted by Edd Morgan
created at 12 Jun 00:17

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require 'WindowsBase'
require 'PresentationFramework'
require 'PresentationCore'
require 'System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

class Clock

    CLOCK_WIDTH     = 150
    CLOCK_HEIGHT    = 150
    LABEL_HEIGHT    = CLOCK_HEIGHT / 7
    LABEL_WIDTH     = CLOCK_WIDTH / 7
    RADIUS          = CLOCK_WIDTH / 2
    RADS            = Math::PI / 180
    MIN_LOCATIONS   = {}
    HOUR_LOCATIONS  = {}

    def run!
        plot_locations

        # build our window
        @window = System::Windows::Window.new
        @window.background = System::Windows::Media::Brushes.LightGray
        @window.width = CLOCK_WIDTH * 2
        @window.height = CLOCK_HEIGHT * 2
        @window.resize_mode = System::Windows::ResizeMode.NoResize
        
        @canvas = System::Windows::Controls::Canvas.new
        @canvas.width = CLOCK_WIDTH
        @canvas.height = CLOCK_HEIGHT

        # create shapes to represent clock hands
        @minute_hand = System::Windows::Shapes::Line.new
        @minute_hand.stroke = System::Windows::Media::Brushes.Black
        @minute_hand.stroke_thickness = 1
        @minute_hand.x1 = CLOCK_WIDTH / 2
        @minute_hand.y1 = CLOCK_HEIGHT / 2

        @hour_hand = System::Windows::Shapes::Line.new
        @hour_hand.stroke = System::Windows::Media::Brushes.Black
        @hour_hand.stroke_thickness = 3
        @hour_hand.x1 = CLOCK_WIDTH / 2
        @hour_hand.y1 = CLOCK_HEIGHT / 2
        
        # .. and stick them to our canvas
        @canvas.children.add(@minute_hand)
        @canvas.children.add(@hour_hand)
        
        plot_face # draw a clock face
        plot_labels # draw clock numbers
        plot_hands # draw minute / hour hands

        @window.content = @canvas
        app = System::Windows::Application.new
        app.run(@window)
        # the Application object handles the lifecycle of our app
        # including the execution loop
    end
    
    # determine 2 sets of equidistant points around the circumference of a circle
    # of CLOCK_WIDTH and CLOCK_HEIGHT dimensions.
    def plot_locations
        for i in (0..60) # 60 minutes, and 12 hours
            a = i * 6
            x = (RADIUS * Math.sin(a * RADS)).to_i + (CLOCK_WIDTH / 2)
            y = (CLOCK_HEIGHT / 2) - (RADIUS * Math.cos(a * RADS)).to_i
            coords = [x, y]
            HOUR_LOCATIONS[i / 5] = coords if i % 5 == 0 # is this also an 'hour' location (ie. every 5 minutes)?
            MIN_LOCATIONS[i] = coords
        end
    end
    
    # draws a circle to represent the clock's face
    def plot_face
        extra_x = (CLOCK_WIDTH * 0.15) # pad our circle a little
        extra_y = (CLOCK_HEIGHT * 0.15)
        face = System::Windows::Shapes::Ellipse.new
        face.fill = System::Windows::Media::Brushes.White
        face.width = CLOCK_WIDTH + extra_x
        face.height = CLOCK_HEIGHT + extra_y
        face.margin = System::Windows::Thickness.new(0 - (extra_x/2), 0 - (extra_y/2), 0, 0)
        face.stroke = System::Windows::Media::Brushes.Gray # give it a slight border
        face.stroke_thickness = 1 
        System::Windows::Controls::Canvas.set_z_index(face, -1) # send our circle to the back
        @canvas.children.add(face) # add the clock face to our canvas
    end
    
    # at each point along the hour locations, put a number
    def plot_labels
        HOUR_LOCATIONS.each_pair do |p, coords|
            unless p == 0
                lbl = System::Windows::Controls::Label.new
                lbl.horizontal_content_alignment = System::Windows::HorizontalAlignment.Center
                lbl.width = LABEL_WIDTH
                lbl.height = LABEL_HEIGHT
                lbl.content = p.to_s
                lbl.margin = System::Windows::Thickness.new(coords[0] - (LABEL_WIDTH / 2), coords[1] - (LABEL_HEIGHT / 2), 0, 0)
                lbl.padding = System::Windows::Thickness.new(0, 0, 0, 0)
                @canvas.children.add(lbl)
            end
        end
    end
    
    def plot_hands
        time = Time.now
        hours = time.hour
        minutes = time.min
        
        if !@minutes || minutes != @minutes
            @hours = hours >= 12 ? hours - 12 : hours
            @minutes = minutes == 0 ? 60 : minutes
            # Dispatcher.BeginInvoke() is asynchronous, though it probably doesn't matter too much here
            @minute_hand.dispatcher.begin_invoke(System::Windows::Threading::DispatcherPriority.Render, System::Action.new {
                @minute_hand.x2 = MIN_LOCATIONS[@minutes][0]
                @minute_hand.y2 = MIN_LOCATIONS[@minutes][1]
                @hour_hand.x2 = HOUR_LOCATIONS[@hours][0]
                @hour_hand.y2 = HOUR_LOCATIONS[@hours][1]
            })
        end
    end
    
end

clock = Clock.new

timer = System::Timers::Timer.new
timer.interval = 1000
timer.elapsed { clock.plot_hands }
timer.enabled = true

clock.run!
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