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// 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 });
}));
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