File size: 5,277 Bytes
40559c4
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
// https://github.com/1wheel/swoopy-drag Copyright (c) 2016 Adam Pearce

(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('d3')) :
  typeof define === 'function' && define.amd ? define(['exports', 'd3'], factory) :
  (factory((global.d3 = global.d3 || {}),global.d3));
}(this, function (exports,d3) { 'use strict';

  function swoopyDrag(){
    var x = function(d){ return d }
    var y = function(d){ return d }

    var annotations = []
    var annotationSel

    var draggable = false

    var dispatch = d3.dispatch('drag')

    var textDrag = d3.drag()
        .on('drag', function(d){
          var x = d3.event.x
          var y = d3.event.y
          d.textOffset = [x, y].map(Math.round)

          d3.select(this).call(translate, d.textOffset)

          dispatch.call('drag')
        })
        .subject(function(d){ return {x: d.textOffset[0], y: d.textOffset[1]} })

    var circleDrag = d3.drag()
        .on('drag', function(d){
          var x = d3.event.x
          var y = d3.event.y
          d.pos = [x, y].map(Math.round)

          var parentSel = d3.select(this.parentNode)

          var path = ''
          var points = parentSel.selectAll('circle').data()
          if (points[0].type == 'A'){
            path = calcCirclePath(points)
          } else{
            points.forEach(function(d){ path = path + d.type  + d.pos })
          }

          parentSel.select('path').attr('d', path).datum().path = path
          d3.select(this).call(translate, d.pos)

          dispatch.call('drag')
        })
        .subject(function(d){ return {x: d.pos[0], y: d.pos[1]} })


    var rv = function(sel){
      annotationSel = sel.html('').selectAll('g')
          .data(annotations).enter()
        .append('g')
          .call(translate, function(d){ return [x(d), y(d)] })

      var textSel = annotationSel.append('text')
          .call(translate, ƒ('textOffset'))
          .text(ƒ('text'))

      annotationSel.append('path')
          .attr('d', ƒ('path'))

      if (!draggable) return

      annotationSel.style('cursor', 'pointer')
      textSel.call(textDrag)

      annotationSel.selectAll('circle').data(function(d){
        var points = []

        if (~d.path.indexOf('A')){
          //handle arc paths seperatly -- only one circle supported
          var pathNode = d3.select(this).select('path').node()
          var l = pathNode.getTotalLength()

          points = [0, .5, 1].map(function(d){
            var p = pathNode.getPointAtLength(d*l)
            return {pos: [p.x, p.y], type: 'A'}
          })
        } else{
          var i = 1
          var type = 'M'
          var commas = 0

          for (var j = 1; j < d.path.length; j++){
            var curChar = d.path[j]
            if (curChar == ',') commas++
            if (curChar == 'L' || curChar == 'C' || commas == 2){
              points.push({pos: d.path.slice(i, j).split(','), type: type})
              type = curChar
              i = j + 1
              commas = 0
            }
          }

          points.push({pos: d.path.slice(i, j).split(','), type: type})
        }

        return points
      }).enter().append('circle')
          .attr('r', 8)
          .attr('fill', 'rgba(0,0,0,0)')
          .attr('stroke', '#333')
          .attr('stroke-dasharray', '2 2')
          .call(translate, ƒ('pos'))
          .call(circleDrag)

      dispatch.call('drag')
    }


    rv.annotations = function(_x){
      if (typeof(_x) == 'undefined') return annotations
      annotations = _x
      return rv
    }
    rv.x = function(_x){
      if (typeof(_x) == 'undefined') return x
      x = _x
      return rv
    }
    rv.y = function(_x){
      if (typeof(_x) == 'undefined') return y
      y = _x
      return rv
    }
    rv.draggable = function(_x){
      if (typeof(_x) == 'undefined') return draggable
      draggable = _x
      return rv
    }
    rv.on = function() {
      var value = dispatch.on.apply(dispatch, arguments);
      return value === dispatch ? rv : value;
    }

    return rv

    //convert 3 points to an Arc Path 
    function calcCirclePath(points){
      var a = points[0].pos
      var b = points[2].pos
      var c = points[1].pos

      var A = dist(b, c)
      var B = dist(c, a)
      var C = dist(a, b)

      var angle = Math.acos((A*A + B*B - C*C)/(2*A*B))
      
      //calc radius of circle
      var K = .5*A*B*Math.sin(angle)
      var r = A*B*C/4/K
      r = Math.round(r*1000)/1000

      //large arc flag
      var laf = +(Math.PI/2 > angle)

      //sweep flag
      var saf = +((b[0] - a[0])*(c[1] - a[1]) - (b[1] - a[1])*(c[0] - a[0]) < 0) 

      return ['M', a, 'A', r, r, 0, laf, saf, b].join(' ')
    }

    function dist(a, b){
      return Math.sqrt(
        Math.pow(a[0] - b[0], 2) +
        Math.pow(a[1] - b[1], 2))
    }


    //no jetpack dependency 
    function translate(sel, pos){
      sel.attr('transform', function(d){
        var posStr = typeof(pos) == 'function' ? pos(d) : pos
        return 'translate(' + posStr + ')' 
      }) 
    }

    function ƒ(str){ return function(d){ return d[str] } } 
  }

  exports.swoopyDrag = swoopyDrag;

  Object.defineProperty(exports, '__esModule', { value: true });

}));