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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              <!-- Dimmer based on:
http://dribbble.com/shots/910235-Light-Dimmer-Switch -->
<figure class="dimmer">
  <div class="wrapper">
    <div class="knob">
      <div class="center"></div>
    </div>
  </div>
  <canvas class="progress" width="300" height="300">  </canvas>
</figure>

            
          
!

CSS

            
              html,
body {
  height: 100%;
  width: 100%;
  overflow: hidden;
}
body {
  background: #000 radial-gradient(ellipse at center, #8c8f95 0%, #4e5054 100%) center center no-repeat;
}

.dimmer {
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -150px;
  width: 300px;
  height: 300px;
  border-radius: 50px;
  background: #eaebea;
  background: linear-gradient(to bottom, #f3f4f3 0%,#afb0b3 99%);
  box-shadow: 0px 20px 14px 0px rgba(70,70,70, 0.4), 0px 4px 10px -0px rgba(0,0,0,0.6), 0px -4px 4px 4px #97979a inset;
}

.dimmer:before {
  content: "";
  position: absolute;
  width: 300px;
  left: 50%;
  margin-left: -150px;
  height: 190px;
  top: 0px;
  border-radius: 50px;
  background: linear-gradient(to bottom, rgba(243, 244, 243, 0.8) 0%, rgba(243, 244, 243, 0) 99%);
  z-index: 1;
}

.dimmer:after {
  content: "";
  position: absolute;
  top: 22px;
  left: 26px;
  width: 250px;
  height: 250px;
  border-radius: 30px;
  box-shadow: 0px -1px 2px 2px rgba(0,0,0,0.3) inset, 0px 1px 3px 3px #f3f4f3 inset;
}

.knob {
  z-index: 20;
  cursor: pointer;
}

.knob .center {
  position: absolute;
  width: 116px;
  height: 116px;
  left: 50%;
  top: 50%;
  margin: -58px 0px 0px -58px;
  border-radius: 160px;
  background: linear-gradient(to bottom, #e7e7e7 0%,#bec0c3 99%);
  box-shadow: inset 0px 5px 4px 2px rgba(0,0,0,0.35);
  z-index: 2;

}

.knob:before {
  content: "";
  position: absolute;
  width: 164px;
  height: 164px;
  left: 50%;
  top: 50%;
  margin: -82px 0px 0px -82px;
  border-radius: 164px;
  background: linear-gradient(to bottom, #f5f5f5 0%,#a6a7a7 99%);
  box-shadow: 0px 5px 12px 0px rgba(0,0,0,0.7);
  z-index: 0;
}

.knob:after {
  content: "";
  position: absolute;
  width: 142px;
  height: 142px;
  left: 50%;
  top: 50%;
  margin: -71px 0px 0px -71px;
  border-radius: 140px;
  background: linear-gradient(to bottom, #afb0b3 0%,#e5e7e6 99%);
  z-index: 1;
}

.progress {
  position: absolute;
}
            
          
!

JS

            
              class Dimmer

  raf: null
  mdown: false

  mPos:
    x: 0
    y: 0

  elementPosition:
    x: 0
    y: 0

  target: 0
  steps: 50
  radius: 150
  maxDiff: 150
  constraint: 360
  maxAngle: 250

  constructor: (@$context) ->
    @$body = $ "body"
    @$knob = @$context.find ".knob"
    @$handle = @$context.find ".handle"
    @$progress = @$context.find ".progress"
    @$center = @$context.find ".center"
    @$textOutput = @$center.find "span"

    @ctx = @$progress.get(0).getContext "2d"

    knobOffset = @$knob.offset()

    @elementPosition =
      x: knobOffset.left
      y: knobOffset.top

    @centerX = @$progress.width()/2
    @centerY = @$progress.height()/2

    @canvasSize = @$progress.width()

    @addEventListeners()
    @drawLine()
    @draw()
    return


  addEventListeners: () ->
    @$context.on "mousedown", @onMouseDown
    @$context.on "mousemove", @onMouseMove
    $("body").on "mouseup", @onMouseUp
    return


  setDimmerPosition: ->
    @draw()
    return

  drawLine: (endAngle)->
    @ctx.save()

    @ctx.translate @centerX, @centerY
    @ctx.rotate (145*(Math.PI/180))
    startAngle = 0
    radius =  93
    x = 0
    y = 0
    @ctx.moveTo(98, 0)

    @ctx.beginPath()
    @ctx.shadowBlur = 10
    @ctx.lineWidth = 2.4
    @ctx.strokeStyle = "#fffdcf"
    @ctx.shadowBlur = 10
    @ctx.shadowColor = "#fff"
    @ctx.arc(x, y, radius, startAngle, endAngle, false)
    @ctx.stroke()


    @ctx.beginPath()
    @ctx.strokeStyle = "#7f7f7f"
    @ctx.shadowBlur = 0
    @ctx.arc(x, y, radius, endAngle, (@maxAngle*Math.PI)/180, false)
    @ctx.stroke()
    @ctx.restore()


  drawSteps: ->
    steps = 4
    @ctx.save()
    @ctx.translate @centerX, @centerY
    @ctx.rotate((135*Math.PI)/180)

    for i in [0..steps] by 1
      @ctx.beginPath()
      @ctx.rotate((180*Math.PI)/180 / steps)

      @ctx.strokeStyle = "#7f7f7f"
      @ctx.lineWidth = 2

      @ctx.lineTo(108, 0)
      @ctx.lineTo(100, 0)
      @ctx.stroke()

    @ctx.restore()
    return


  drawNumbers: () ->
    steps = 4
    angle = (180*(Math.PI/180))
    step = (180*Math.PI)/180 / steps
    radius = 116

    @ctx.translate @centerX, @centerY
    @ctx.save()

    for i in [0..steps] by 1
      x = (radius * Math.cos(angle))-4
      y = (radius * Math.sin(angle))+4
      angle += step

      @ctx.fillStyle = "#7f7f7f";
      @ctx.font = "bold 13px Arial";
      @ctx.fillText(i+1, x, y);

    @ctx.restore()


    @ctx.fillStyle = "#636262";
    @ctx.font = "normal 12px Arial";
    @ctx.fillText("OFF", -84, 75);
    @ctx.fillText("MAX", 62, 75);
    return


  draw: ()->
    @$progress.get(0).height = @canvasSize
    @$progress.get(0).width = @canvasSize

    endAngle = (@maxAngle*Math.PI)/180

    @drawLine((@target*Math.PI)/180)
    @drawSteps()
    @drawNumbers()
    @updateBackground()
    return


  updateBackground: ->
    normalizedTarget =  @map @target, 0, @maxAngle, 0, 1

    gray = parseInt(normalizedTarget*255,10)
    @$body.css
      background: "#000 radial-gradient(ellipse at center, #8c8f95 0%, rgb(#{gray},#{gray},#{gray}) 100%) center center no-repeat"

    return

  setMousePosition: (event) ->
    @mPos =
      x: event.pageX - (@elementPosition.x + @centerX)
      y: event.pageY - (@elementPosition.y + @centerY)

    ang = Math.atan2 @mPos.x, @mPos.y
    if ang < 0 then ang = ang + 2 * Math.PI

    
    deg = 360 - (ang * (180/Math.PI))
    target = @map(deg, 0, 360, -40, 270)

    diff = Math.abs target - @target

    if diff < @maxDiff and target < @constraint
      @target = target

      if @target > @maxAngle then @target = @maxAngle
      if @target < 0 then @target = 0

    @setDimmerPosition()
    return


  # Callbacks
  onMouseDown: (event) =>
    @mdown = true
    return


  onMouseUp: (event) =>
    @mdown = false
    return


  onMouseMove: (event) =>
    if @mdown then @setMousePosition event
    return

  map: (value, low1, high1, low2, high2) ->
    return low2 + (high2 - low2) * (value - low1) / (high1 - low1)



@$dimmer = $ ".dimmer"
dimmer = new Dimmer @$dimmer

            
          
!
999px

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