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CSS

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HTML 

              
                <input type="text" name = "title" placeholder="new node" id="node-title" />
<input type="button" value="add node" id="add-node" />
<label for="edge-mode">
  <input type="checkbox" id="edge-mode" />edge
</label>
<div id="container"></div>
!

CSS 

              
                #container {
  border: 1px solid #000;
  width: 600px;
  height: 350px;
}

label, input[type='checkbox'] {
    cursor: pointer;
}
!

JS 

              
                class Node
  constructor: (@title, @xpos, @ypos, @width, @height, @id) ->
  centerX: -> @xpos + @width/2
  centerY: -> @ypos + @height/2
  show: -> "title:#{@title} :#{@xpos} y:#{@ypos} width:#{@width} height:#{@height}"

class Edge
  constructor: (@from, @to, @id) ->
  @startx: 0
  @starty: 0
  @endx: 0
  @endy: 0
  show: ->
    "from:#{@from}(#{@startx}, #{@starty}) to:#{@to}(#{@endx}, #{@endy})"

@Nodes = []
@Edges = []

class EdgeAdding
  @enabled: false
  @adding: false
  @startx: 0
  @starty: 0
  @endx: 0
  @endy: 0
  @from: ''
  @to: ''
  started: ->
    @adding is true
  start: ->
    @adding = true
  end: ->
    @adding = false
  fromAttr: (edgeId)-> 
    edge = new Edge(@from, @to, edgeId)
    edge.startx = @startx
    edge.starty = @starty
    edge.endx = @endx
    edge.endy = @endy
    edge

@edgeAdding = new EdgeAdding()

@dragContext =
  nodeId:0
  node: null
  froms: []
  tos: []

class Sequence
  constructor: (@nodeSeq, @edgeSeq) ->
  getNodeSeq: ->
    @nodeSeq++
  getEdgeSeq: ->
    @edgeSeq++
@sequence = new Sequence(0, 0)

class Graph
  addNode: (title) ->
    id = sequence.getNodeSeq()
    node = new Node title, konvaStage.randomX(), konvaStage.randomY(), 0, 0, id
    shape = konvaFactory.createShape(node, id)
    node.width = shape.width()
    node.height = shape.height()
    console.log node.show()
    konvaStage.registerShape shape
    Nodes.push node
    id

  addEdge: ->
    edge = edgeAdding.fromAttr(sequence.getEdgeSeq())
    this.addEdgeInternal edge

  addEdgeByIds: (fromId, toId) ->
    edgeId = sequence.getEdgeSeq()
    edge = new Edge(fromId, toId, edgeId)
    fromNode = _.find Nodes, (node) -> node.id == fromId
    toNode = _.find Nodes, (node) -> node.id == toId
    edge.startx = fromNode.centerX()
    edge.starty = fromNode.centerY()
    edge.endx = toNode.centerX()
    edge.endy = toNode.centerY()
    this.addEdgeInternal edge

  addEdgeInternal: (newEdge) ->
    edge = _.find Edges, (e) ->
      e.from is newEdge.from && e.to is newEdge.to || e.from is newEdge.to && e.to is newEdge.from
    if !edge?
      Edges.push newEdge
      console.log newEdge.show()
      konvaStage.registerLine konvaFactory.createLine newEdge
    else
      console.log "edge already exists.."

  moveNode: ->
    id = dragContext.nodeId
    x = dragContext.node.xpos
    y = dragContext.node.ypos
    node = _.find Nodes, (node) -> node.id == id
    node.xpos = x
    node.ypos = y

  moveEdges: ->
    x = dragContext.node.centerX()
    y = dragContext.node.centerY()
    _.each dragContext.froms, (edge) ->
      edge.startx = x
      edge.starty = y
    _.each dragContext.tos, (edge) ->
      edge.endx = x
      edge.endy = y

  getNode: (id) ->
    _.find Nodes, (node) -> node.id == id

  findEdgesFrom: (nodeId) ->
    _.filter Edges, (edge) -> edge.from == nodeId

  findEdgesTo: (nodeId) ->
    _.filter Edges, (edge) -> edge.to == nodeId

@graph = new Graph

class KonvaStage
  constructor: ->
    @stage = new Konva.Stage({
      container  : container
      width      : 600
      height     : 350
    })
    @layer = new Konva.Layer()
    .on 'mouseup tap', (event) ->
      layerEdgeAction(event)
    @stage.add @layer
  randomX: ->
    parseInt Math.random()*(@stage.getWidth() / 2)
  randomY: ->
    parseInt Math.random()*(@stage.getHeight() / 2)
  registerShape: (label) ->
    @layer.add label
    applyTweenTo label.getTag()
    applyTweenTo label.getText()
    @layer.draw()
  registerLine: (line) ->
    @layer.add line
    line.moveToBottom()
    @layer.draw()
  applyTweenTo = (node) ->
    node.tween = new Konva.Tween({
      node: node
      scaleX: 1.2
      scaleY: 1.2
      easing: Konva.Easings.EaseInOut
      duration: 0.5
    })
  dragEdges: ->
    l = @layer
    n = dragContext.node
    _.each dragContext.froms, (from) ->
      edgeId = from.id
      line = l.find("##{edgeId}")[0]
      if line
        points = line.attrs.points
        line.points [n.centerX(), n.centerY(), points[2], points[3]]
        l.draw()
    _.each dragContext.tos, (to) ->
      edgeId = to.id
      line = l.find("##{edgeId}")[0]
      if line
        points = line.attrs.points
        line.points [points[0], points[1], n.centerX(), n.centerY()]
        l.draw()

layerEdgeAction = (event) ->
  if !edgeAdding.enabled
    return
  if !edgeAdding.started()
    edgeAdding.start()
  else
    edgeAdding.end()
    if edgeAdding.from is edgeAdding.to
      return
    graph.addEdge()
    edgeAdding.enabled = false
    $("#edge-mode").prop("checked", false)

@konvaStage = new KonvaStage

class KonvaFactory
  createShape: (graphNode, id) ->
    new Konva.Label({
      x: graphNode.xpos
      y: graphNode.ypos
      width: 100
      height: 50
      draggable: true
      id: id
      name: graphNode.title
    })
    .on 'dragstart', () ->
      dragStartAction(@)
    .on 'dragmove', () ->
      dragMoveAction(@)
    .on 'dragend', () ->
      dragEndAction(@)
    .on 'mouseover touchstart', () ->
      document.body.style.cursor = 'pointer'
      if edgeAdding.enabled
        @getTag().tween.play()
        @getText().tween.play()
    .on 'mouseout touchend', () ->
      document.body.style.cursor = 'default'
      if edgeAdding.enabled
        @getTag().tween.reverse()
        @getText().tween.reverse()
    .on 'mouseup tap', (event) ->
      labelEdgeAction(event, @)
    .add new Konva.Tag({
      fill: ((length) ->
        n = parseInt Math.random() * Math.floor(5)
        if n ==  0
          '#CEF6CE' # 緑
        else if n == 1
          '#F5A9A9' # ピンク
        else if n == 2
          '#F6CEF5' # 紫
        else if n == 3
          '#F2F5A9' # 黄
        else
          '#FFFFFF' # 白
        )(graphNode.title.length)
      stroke: 'black'
      strokeWidth: 4
    })
    .add new Konva.Text({
      text: graphNode.title
      fontSize: 14
      padding: 8
      fill: 'black'
    })

  createLine: (edge) ->
    line = new Konva.Line({
      points: [edge.startx, edge.starty, edge.endx, edge.endy]
      stroke: 'black'
      strokeWidth: 4
      id: edge.id
      name: 'test'
    })

labelEdgeAction = (event, shape) ->
  if edgeAdding.enabled
    if !edgeAdding.started()
      edgeAdding.from = shape.getId()
      edgeAdding.startx = shape.x() + shape.width()/2
      edgeAdding.starty = shape.y() + shape.height()/2
    else if edgeAdding.started()
      edgeAdding.to = shape.getId()
      edgeAdding.endx = shape.x() + shape.width()/2
      edgeAdding.endy = shape.y() + shape.height()/2

dragStartAction = (shape) ->
  dragContext.nodeId = shape.getId()
  node = graph.getNode shape.getId()
  console.log "drag began. - #{node.title}"
  if node
    node.xpos = shape.x()
    node.ypos = shape.y()
    dragContext.node = node
    dragContext.froms = graph.findEdgesFrom shape.getId()
    dragContext.tos = graph.findEdgesTo shape.getId()

dragMoveAction = (shape) ->
  dragContext.node.xpos = shape.x()
  dragContext.node.ypos = shape.y()
  konvaStage.dragEdges()

dragEndAction = (shape) ->
  console.log 'drag End.'
  #console.log dragContext
  dragContext.node.xpos = shape.x()
  dragContext.node.ypos = shape.y()
  graph.moveNode()
  konvaStage.dragEdges()
  graph.moveEdges()

@konvaFactory = new KonvaFactory

append = () ->
  title = $('#node-title').val()
  if title != ''
    graph.addNode title
    $('#node-title').val ''

$('#add-node').click -> append()

$('#node-title').keypress (key)->
  if key.charCode == 13
    append()

$("#edge-mode").click ->
  edgeAdding.enabled = $("#edge-mode").prop("checked")
  console.log "edge mode:" + $("#edge-mode").prop("checked")

funa = graph.addNode 'ふなっしー'
hyaha = graph.addNode 'ヒャッハー ヒャッハー'
shiru = graph.addNode '梨汁プシャー'
graph.addEdgeByIds funa, hyaha
graph.addEdgeByIds funa, shiru
!
999px

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