Graph editing tools

.block

license: mit

README.md

Starting from the previous example, this one implements a more complete graph editing tool.

Select a tool to operate on the graph: The pointer only lets the user pan & zoom or drag nodes around. The add node tool opens up a library of node types; click one to add a node of that type to the graph. The add link tool lets the user connect two nodes with a drag gesture from the first to the second one.

Clicking a node or a link always selects it regardless of the current tool. You can press del to remove the current selection.

The example activates and deactivates d3.js's drag behavior on nodes by using a technique found in this example by Ross Kirsling: Everytime the behavior has to be deactivated, the underlying listeners (mousedown.drag and touchstart.drag) are cleared.

Mouse coordinates are used to move the representation of a new link. The coordinates are retrieved as in this example; Please note that the container passed to d3.mouse has to be a DOM node, not a d3 selection. To obtain a DOM node from a selection, use the selection.node() method (d3 wiki).

To make the text labels unselectable, d3.event.preventDefault() is used in the mousedown handler. For preventing the text to be ever selected at all (for example when dragging from the HTML node library), the CSS property user-select has been set to none (see this link).

There is no support for adding links with touch gestures.

The code is a real mess, and some questionable choices have been made because I ran out of time (like for example inlining the SVG for the tool buttons).

forked from nitaku's block: Graph editing tools

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":"0":u)),a.push(r),c=o+1);return a.push(t.substring(c,o)),a.join("")}var e=t.length;return n.parse=function(n){var e={y:1900,m:0,d:1,H:0,M:0,S:0,L:0},r=Ju(e,t,n,0);if(r!=n.length)return null;"p"in e&&(e.H=e.H%12+12*e.p);var u=new To;return u.setFullYear(e.y,e.m,e.d),u.setHours(e.H,e.M,e.S,e.L),u},n.toString=function(){return t},n};var Ro=Gu(Fo),Oo=Gu(Ho),Yo=Gu(jo),Uo=Ku(jo),Io=Gu(Po),Vo=Ku(Po),Xo={"-":"",_:" ",0:"0"},Zo={a:function(t){return Ho[t.getDay()]},A:function(t){return Fo[t.getDay()]},b:function(t){return Po[t.getMonth()]},B:function(t){return jo[t.getMonth()]},c:qi.time.format(zo),d:function(t,n){return Wu(t.getDate(),n,2)},e:function(t,n){return Wu(t.getDate(),n,2)},H:function(t,n){return Wu(t.getHours(),n,2)},I:function(t,n){return Wu(t.getHours()%12||12,n,2)},j:function(t,n){return Wu(1+qi.time.dayOfYear(t),n,3)},L:function(t,n){return Wu(t.getMilliseconds(),n,3)},m:function(t,n){return Wu(t.getMonth()+1,n,2)},M:function(t,n){return Wu(t.getMinutes(),n,2)},p:function(t){return t.getHours()>=12?"PM":"AM"},S:function(t,n){return Wu(t.getSeconds(),n,2)},U:function(t,n){return Wu(qi.time.sundayOfYear(t),n,2)},w:function(t){return t.getDay()},W:function(t,n){return Wu(qi.time.mondayOfYear(t),n,2)},x:qi.time.format(Do),X:qi.time.format(Lo),y:function(t,n){return Wu(t.getFullYear()%100,n,2)},Y:function(t,n){return Wu(t.getFullYear()%1e4,n,4)},Z:mi,"%":function(){return"%"}},Bo={a:Qu,A:ti,b:ni,B:ei,c:ri,d:fi,e:fi,H:si,I:si,L:pi,m:li,M:hi,p:di,S:gi,x:ui,X:ii,y:oi,Y:ai},$o=/^\s*\d+/,Jo=qi.map({am:0,pm:1});qi.time.format.utc=function(t){function n(t){try{To=$u;var n=new To;return n._=t,e(n)}finally{To=Date}}var e=qi.time.format(t);return n.parse=function(t){try{To=$u;var n=e.parse(t);return n&&n._}finally{To=Date}},n.toString=e.toString,n};var Go=qi.time.format.utc("%Y-%m-%dT%H:%M:%S.%LZ");qi.time.format.iso=Date.prototype.toISOString?vi:Go,vi.parse=function(t){var n=new Date(t);return isNaN(n)?null:n},vi.toString=Go.toString,qi.time.second=yi(function(t){return new To(1e3*Math.floor(t/1e3))},function(t,n){t.setTime(t.getTime()+1e3*Math.floor(n))},function(t){return t.getSeconds()}),qi.time.seconds=qi.time.second.range,qi.time.seconds.utc=qi.time.second.utc.range,qi.time.minute=yi(function(t){return new To(6e4*Math.floor(t/6e4))},function(t,n){t.setTime(t.getTime()+6e4*Math.floor(n))},function(t){return t.getMinutes()}),qi.time.minutes=qi.time.minute.range,qi.time.minutes.utc=qi.time.minute.utc.range,qi.time.hour=yi(function(t){var n=t.getTimezoneOffset()/60;return new To(36e5*(Math.floor(t/36e5-n)+n))},function(t,n){t.setTime(t.getTime()+36e5*Math.floor(n))},function(t){return t.getHours()}),qi.time.hours=qi.time.hour.range,qi.time.hours.utc=qi.time.hour.utc.range,qi.time.day=yi(function(t){var n=new To(1970,0);return n.setFullYear(t.getFullYear(),t.getMonth(),t.getDate()),n},function(t,n){t.setDate(t.getDate()+n)},function(t){return t.getDate()-1}),qi.time.days=qi.time.day.range,qi.time.days.utc=qi.time.day.utc.range,qi.time.dayOfYear=function(t){var n=qi.time.year(t);return Math.floor((t-n-6e4*(t.getTimezoneOffset()-n.getTimezoneOffset()))/864e5)},qo.forEach(function(t,n){t=t.toLowerCase(),n=7-n;var e=qi.time[t]=yi(function(t){return(t=qi.time.day(t)).setDate(t.getDate()-(t.getDay()+n)%7),t},function(t,n){t.setDate(t.getDate()+7*Math.floor(n))},function(t){var e=qi.time.year(t).getDay();return Math.floor((qi.time.dayOfYear(t)+(e+n)%7)/7)-(e!==n)});qi.time[t+"s"]=e.range,qi.time[t+"s"].utc=e.utc.range,qi.time[t+"OfYear"]=function(t){var e=qi.time.year(t).getDay();return Math.floor((qi.time.dayOfYear(t)+(e+n)%7)/7)}}),qi.time.week=qi.time.sunday,qi.time.weeks=qi.time.sunday.range,qi.time.weeks.utc=qi.time.sunday.utc.range,qi.time.weekOfYear=qi.time.sundayOfYear,qi.time.month=yi(function(t){return t=qi.time.day(t),t.setDate(1),t},function(t,n){t.setMonth(t.getMonth()+n)},function(t){return t.getMonth()}),qi.time.months=qi.time.month.range,qi.time.months.utc=qi.time.month.utc.range,qi.time.year=yi(function(t){return t=qi.time.day(t),t.setMonth(0,1),t},function(t,n){t.setFullYear(t.getFullYear()+n)},function(t){return t.getFullYear()}),qi.time.years=qi.time.year.range,qi.time.years.utc=qi.time.year.utc.range;var Ko=[1e3,5e3,15e3,3e4,6e4,3e5,9e5,18e5,36e5,108e5,216e5,432e5,864e5,1728e5,6048e5,2592e6,7776e6,31536e6],Wo=[[qi.time.second,1],[qi.time.second,5],[qi.time.second,15],[qi.time.second,30],[qi.time.minute,1],[qi.time.minute,5],[qi.time.minute,15],[qi.time.minute,30],[qi.time.hour,1],[qi.time.hour,3],[qi.time.hour,6],[qi.time.hour,12],[qi.time.day,1],[qi.time.day,2],[qi.time.week,1],[qi.time.month,1],[qi.time.month,3],[qi.time.year,1]],Qo=[[qi.time.format("%Y"),o],[qi.time.format("%B"),function(t){return t.getMonth()}],[qi.time.format("%b %d"),function(t){return 1!=t.getDate()}],[qi.time.format("%a %d"),function(t){return t.getDay()&&1!=t.getDate()}],[qi.time.format("%I %p"),function(t){return t.getHours()}],[qi.time.format("%I:%M"),function(t){return t.getMinutes()}],[qi.time.format(":%S"),function(t){return t.getSeconds()}],[qi.time.format(".%L"),function(t){return t.getMilliseconds()}]],tc=qi.scale.linear(),nc=wi(Qo);Wo.year=function(t,n){return tc.domain(t.map(ki)).ticks(n).map(Si)},qi.time.scale=function(){return bi(qi.scale.linear(),Wo,nc)};var ec=Wo.map(function(t){return[t[0].utc,t[1]]}),rc=[[qi.time.format.utc("%Y"),o],[qi.time.format.utc("%B"),function(t){return t.getUTCMonth()}],[qi.time.format.utc("%b %d"),function(t){return 1!=t.getUTCDate()}],[qi.time.format.utc("%a %d"),function(t){return t.getUTCDay()&&1!=t.getUTCDate()}],[qi.time.format.utc("%I %p"),function(t){return t.getUTCHours()}],[qi.time.format.utc("%I:%M"),function(t){return t.getUTCMinutes()}],[qi.time.format.utc(":%S"),function(t){return t.getUTCSeconds()}],[qi.time.format.utc(".%L"),function(t){return t.getUTCMilliseconds()}]],uc=wi(rc);return ec.year=function(t,n){return tc.domain(t.map(Ai)).ticks(n).map(Ei)},qi.time.scale.utc=function(){return bi(qi.scale.linear(),ec,uc)},qi}();

index.coffee

width = 960
height = 500

### SELECTION - store the selected node ###
### EDITING - store the drag mode (either 'drag' or 'add_link') ###
global = {
    selection: null
}

### create some fake data ###
graph = {
    nodes: [
        {id: 'A', x: 469, y: 410, type: 'X'},
        {id: 'B', x: 493, y: 364, type: 'X'},
        {id: 'C', x: 442, y: 365, type: 'X'},
        {id: 'D', x: 467, y: 314, type: 'X'},
        {id: 'E', x: 477, y: 248, type: 'Y'},
        {id: 'F', x: 425, y: 207, type: 'Y'},
        {id: 'G', x: 402, y: 155, type: 'Y'},
        {id: 'H', x: 369, y: 196, type: 'Y'},
        {id: 'I', x: 350, y: 148, type: 'Z'},
        {id: 'J', x: 539, y: 222, type: 'Z'},
        {id: 'K', x: 594, y: 235, type: 'Z'},
        {id: 'L', x: 582, y: 185, type: 'Z'},
        {id: 'M', x: 633, y: 200, type: 'Z'}
    ],
    links: [
        {source: 'A', target: 'B'},
        {source: 'B', target: 'C'},
        {source: 'C', target: 'A'},
        {source: 'B', target: 'D'},
        {source: 'D', target: 'C'},
        {source: 'D', target: 'E'},
        {source: 'E', target: 'F'},
        {source: 'F', target: 'G'},
        {source: 'F', target: 'H'},
        {source: 'G', target: 'H'},
        {source: 'G', target: 'I'},
        {source: 'H', target: 'I'},
        {source: 'J', target: 'E'},
        {source: 'J', target: 'L'},
        {source: 'J', target: 'K'},
        {source: 'K', target: 'L'},
        {source: 'L', target: 'M'},
        {source: 'M', target: 'K'}
    ],
    objectify: (() ->
        ### resolve node IDs (not optimized at all!) ###
        for l in graph.links
            for n in graph.nodes
                if l.source is n.id
                    l.source = n
                    continue
                    
                if l.target is n.id
                    l.target = n
                    continue
    ),
    remove: ((condemned) ->
        ### remove the given node or link from the graph, also deleting dangling links if a node is removed ###
        if condemned in graph.nodes
            graph.nodes = graph.nodes.filter (n) -> n isnt condemned
            graph.links = graph.links.filter (l) -> l.source.id isnt condemned.id and l.target.id isnt condemned.id
        else if condemned in graph.links
            graph.links = graph.links.filter (l) -> l isnt condemned
    ),
    last_index: 0,
    add_node: ((type) ->
        n = {
            id: graph.last_index++,
            x: width/2,
            y: height/2,
            type: type
        }
        graph.nodes.push(n)
        
        return n
    ),
    add_link: ((source, target) ->
        ### avoid links to self ###
        return null if source is target
        
        ### avoid link duplicates ###
        for link in graph.links
            return null if link.source is source and link.target is target
            
        l = {
            source: source,
            target: target
        }
        graph.links.push(l)
        
        return l
    )
}

graph.objectify()

window.main = (() ->
    ### create the SVG ###
    svg = d3.select('body').append('svg')
        .attr('width', width)
        .attr('height', height)
        
    ### ZOOM and PAN ###
    ### create container elements ###
    container = svg.append('g')
    
    container.call(d3.behavior.zoom().scaleExtent([0.5, 8]).on('zoom', (() -> global.vis.attr('transform', "translate(#{d3.event.translate})scale(#{d3.event.scale})"))))
    
    global.vis = container.append('g')
    
    ### create a rectangular overlay to catch events ###
    ### WARNING rect size is huge but not infinite. this is a dirty hack ###
    global.vis.append('rect')
        .attr('class', 'overlay')
        .attr('x', -500000)
        .attr('y', -500000)
        .attr('width', 1000000)
        .attr('height', 1000000)
        .on('click', ((d) ->
            ### SELECTION ###
            global.selection = null
            d3.selectAll('.node').classed('selected', false)
            d3.selectAll('.link').classed('selected', false)
        ))
        
    ### END ZOOM and PAN ###
    
    global.colorify = d3.scale.category10()
    
    ### initialize the force layout ###
    global.force = d3.layout.force()
        .size([width, height])
        .charge(-400)
        .linkDistance(60)
        .on('tick', (() ->
            ### update nodes and links  ###
            global.vis.selectAll('.node')
                .attr('transform', (d) -> "translate(#{d.x},#{d.y})")
                
            global.vis.selectAll('.link')
                .attr('x1', (d) -> d.source.x)
                .attr('y1', (d) -> d.source.y)
                .attr('x2', (d) -> d.target.x)
                .attr('y2', (d) -> d.target.y)
        ))
        
    ### DRAG ###
    global.drag = global.force.drag().on('dragstart', (d) -> d.fixed = true)
    
    ### DELETION - pressing DEL deletes the selection ###
    d3.select(window)
        .on('keydown', () ->
            if d3.event.keyCode is 46 # DEL
                if global.selection?
                    graph.remove global.selection
                    global.selection = null
                    update()
        )
        
    update()
    
    ### TOOLBAR ###
    toolbar = $("<div class='toolbar'></div>")
    $('body').append(toolbar)
    
    toolbar.append($("""
        <svg
            class='active tool'
            data-tool='pointer'
            xmlns='http://www.w3.org/2000/svg'
            version='1.1'
            width='32'
            height='32'
            viewBox='0 0 128 128'>
            <g transform='translate(881.10358,-356.22543)'>
              <g transform='matrix(0.8660254,-0.5,0.5,0.8660254,-266.51112,-215.31898)'>
                <path
                   d='m -797.14902,212.29589 a 5.6610848,8.6573169 0 0 0 -4.61823,4.3125 l -28.3428,75.0625 a 5.6610848,8.6573169 0 0 0 4.90431,13 l 56.68561,0 a 5.6610848,8.6573169 0 0 0 4.9043,-13 l -28.3428,-75.0625 a 5.6610848,8.6573169 0 0 0 -5.19039,-4.3125 z m 0.28608,25.96875 18.53419,49.09375 -37.06838,0 18.53419,-49.09375 z'
                />
                <path
                   d='m -801.84375,290.40625 c -2.09434,2.1e-4 -3.99979,1.90566 -4,4 l 0,35.25 c 2.1e-4,2.09434 1.90566,3.99979 4,4 l 10,0 c 2.09434,-2.1e-4 3.99979,-1.90566 4,-4 l 0,-35.25 c -2.1e-4,-2.09434 -1.90566,-3.99979 -4,-4 z'
                />
              </g>
            </g>
        </svg>
    """))
    toolbar.append($("""
        <svg
            class='tool'
            data-tool='add_node'
            xmlns='http://www.w3.org/2000/svg'
            version='1.1'
            width='32'
            height='32'
            viewBox='0 0 128 128'>
            <g transform='translate(720.71649,-356.22543)'>
              <g transform='translate(-3.8571429,146.42857)'>
                <path
                   d='m -658.27638,248.37149 c -1.95543,0.19978 -3.60373,2.03442 -3.59375,4 l 0,12.40625 -12.40625,0 c -2.09434,2.1e-4 -3.99979,1.90566 -4,4 l 0,10 c -0.007,0.1353 -0.007,0.27095 0,0.40625 0.19978,1.95543 2.03442,3.60373 4,3.59375 l 12.40625,0 0,12.4375 c 2.1e-4,2.09434 1.90566,3.99979 4,4 l 10,0 c 2.09434,-2.1e-4 3.99979,-1.90566 4,-4 l 0,-12.4375 12.4375,0 c 2.09434,-2.1e-4 3.99979,-1.90566 4,-4 l 0,-10 c -2.1e-4,-2.09434 -1.90566,-3.99979 -4,-4 l -12.4375,0 0,-12.40625 c -2.1e-4,-2.09434 -1.90566,-3.99979 -4,-4 l -10,0 c -0.1353,-0.007 -0.27095,-0.007 -0.40625,0 z'
                />
                <path
                   d='m -652.84375,213.9375 c -32.97528,0 -59.875,26.86847 -59.875,59.84375 0,32.97528 26.89972,59.875 59.875,59.875 32.97528,0 59.84375,-26.89972 59.84375,-59.875 0,-32.97528 -26.86847,-59.84375 -59.84375,-59.84375 z m 0,14 c 25.40911,0 45.84375,20.43464 45.84375,45.84375 0,25.40911 -20.43464,45.875 -45.84375,45.875 -25.40911,0 -45.875,-20.46589 -45.875,-45.875 0,-25.40911 20.46589,-45.84375 45.875,-45.84375 z'
                />
              </g>
            </g>
        </svg>
    """))
    toolbar.append($("""
        <svg
            class='tool'
            data-tool='add_link'
            xmlns='http://www.w3.org/2000/svg'
            version='1.1'
            width='32'
            height='32'
            viewBox='0 0 128 128'>
        <g transform='translate(557.53125,-356.22543)'>
            <g transform='translate(20,0)'>
              <path
                 d='m -480.84375,360 c -15.02602,0 -27.375,12.31773 -27.375,27.34375 0,4.24084 1.00221,8.28018 2.75,11.875 l -28.875,28.875 c -3.59505,-1.74807 -7.6338,-2.75 -11.875,-2.75 -15.02602,0 -27.34375,12.34898 -27.34375,27.375 0,15.02602 12.31773,27.34375 27.34375,27.34375 15.02602,0 27.375,-12.31773 27.375,-27.34375 0,-4.26067 -0.98685,-8.29868 -2.75,-11.90625 L -492.75,411.96875 c 3.60156,1.75589 7.65494,2.75 11.90625,2.75 15.02602,0 27.34375,-12.34898 27.34375,-27.375 C -453.5,372.31773 -465.81773,360 -480.84375,360 z m 0,14 c 7.45986,0 13.34375,5.88389 13.34375,13.34375 0,7.45986 -5.88389,13.375 -13.34375,13.375 -7.45986,0 -13.375,-5.91514 -13.375,-13.375 0,-7.45986 5.91514,-13.34375 13.375,-13.34375 z m -65.375,65.34375 c 7.45986,0 13.34375,5.91514 13.34375,13.375 0,7.45986 -5.88389,13.34375 -13.34375,13.34375 -7.45986,0 -13.34375,-5.88389 -13.34375,-13.34375 0,-7.45986 5.88389,-13.375 13.34375,-13.375 z'
              />
              <path
                 d='m -484.34375,429.25 c -1.95543,0.19978 -3.60373,2.03442 -3.59375,4 l 0,12.40625 -12.40625,0 c -2.09434,2.1e-4 -3.99979,1.90566 -4,4 l 0,10 c -0.007,0.1353 -0.007,0.27095 0,0.40625 0.19978,1.95543 2.03442,3.60373 4,3.59375 l 12.40625,0 0,12.4375 c 2.1e-4,2.09434 1.90566,3.99979 4,4 l 10,0 c 2.09434,-2.1e-4 3.99979,-1.90566 4,-4 l 0,-12.4375 12.4375,0 c 2.09434,-2.1e-4 3.99979,-1.90566 4,-4 l 0,-10 c -2.1e-4,-2.09434 -1.90566,-3.99979 -4,-4 l -12.4375,0 0,-12.40625 c -2.1e-4,-2.09434 -1.90566,-3.99979 -4,-4 l -10,0 c -0.1353,-0.007 -0.27095,-0.007 -0.40625,0 z'
              />
            </g>
          </g>
        </svg>
    """))
    
    library = $("<div class='library'></div></div>")
    toolbar.append(library)
    
    ['X','Y','Z','W'].forEach (type) ->
        new_btn = $("""
            <svg width='42' height='42'>
                <g class='node'>
                    <circle
                        cx='21'
                        cy='21'
                        r='18'
                        stroke='#{global.colorify(type)}'
                        fill='#{d3.hcl(global.colorify(type)).brighter(3)}'
                    />
                </g>
            </svg>
        """)
        new_btn.bind 'click', () ->
            graph.add_node(type)
            update()
            
        library.append(new_btn)
        library.hide()
        
    global.tool = 'pointer'
    
    global.new_link_source = null
    global.vis
        .on('mousemove.add_link', ((d) ->
            ### check if there is a new link in creation ###
            if global.new_link_source?
                ### update the draggable link representation ###
                p = d3.mouse(global.vis.node())
                global.drag_link
                    .attr('x1', global.new_link_source.x) # source node can be in movement
                    .attr('y1', global.new_link_source.y)
                    .attr('x2', p[0])
                    .attr('y2', p[1])
        ))
        .on('mouseup.add_link', ((d) ->
            global.new_link_source = null
            
            ### remove the draggable link representation, if exists ###
            global.drag_link.remove() if global.drag_link?
        ))
        
    d3.selectAll('.tool').on 'click', () ->
        d3.selectAll('.tool').classed('active', false)
        d3.select(this).classed('active', true)
        
        new_tool = $(this).data('tool')
        
        nodes = global.vis.selectAll('.node')
        
        if new_tool is 'add_link' and global.tool isnt 'add_link'
            ### remove drag handlers from nodes ###
            nodes
                .on('mousedown.drag', null)
                .on('touchstart.drag', null)
                
            ### add drag handlers for the add_link tool ###
            nodes
                .call(drag_add_link)
                
        else if new_tool isnt 'add_link' and global.tool is 'add_link'
            ### remove drag handlers for the add_link tool ###
            nodes
                .on('mousedown.add_link', null)
                .on('mouseup.add_link', null)
                
            ### add drag behavior to nodes ###
            nodes
                .call(global.drag)
            
        if new_tool is 'add_node'
            library.show()
        else
            library.hide()
            
        global.tool = new_tool
)

update = () ->
    ### update the layout ###
    global.force
        .nodes(graph.nodes)
        .links(graph.links)
        .start()
        
    ### create nodes and links ###
    ### (links are drawn with insert to make them appear under the nodes) ###
    
    ### also define a drag behavior to drag nodes ###
    ### dragged nodes become fixed ###
    nodes = global.vis.selectAll('.node')
        .data(graph.nodes, (d) -> d.id)
        
    new_nodes = nodes
      .enter().append('g')
        .attr('class', 'node')
        .on('click', ((d) ->
            ### SELECTION ###
            global.selection = d
            d3.selectAll('.node').classed('selected', (d2) -> d2 is d)
            d3.selectAll('.link').classed('selected', false)
        ))
        
    links = global.vis.selectAll('.link')
        .data(graph.links, (d) -> "#{d.source.id}->#{d.target.id}")
        
    links
      .enter().insert('line', '.node')
        .attr('class', 'link')
        .on('click', ((d) ->
            ### SELECTION ###
            global.selection = d
            d3.selectAll('.link').classed('selected', (d2) -> d2 is d)
            d3.selectAll('.node').classed('selected', false)
        ))
        
    links
      .exit().remove()
      
    ### TOOLBAR - add link tool initialization for new nodes ###
    if global.tool is 'add_link'
        new_nodes.call(drag_add_link)
    else
        new_nodes.call(global.drag) # DRAG
        
    new_nodes.append('circle')
        .attr('r', 18)
        .attr('stroke', (d) -> global.colorify(d.type))
        .attr('fill', (d) -> d3.hcl(global.colorify(d.type)).brighter(3))
        
    ### draw the label ###
    new_nodes.append('text')
        .text((d) -> d.id)
        .attr('dy', '0.35em')
        .attr('fill', (d) -> global.colorify(d.type))
        
    nodes
      .exit().remove()
      
drag_add_link = (selection) ->
    selection
        .on('mousedown.add_link', ((d) ->
            global.new_link_source = d
            
            ### create the draggable link representation ###
            p = d3.mouse(global.vis.node())
            global.drag_link = global.vis.insert('line', '.node')
                .attr('class', 'drag_link')
                .attr('x1', d.x)
                .attr('y1', d.y)
                .attr('x2', p[0])
                .attr('y2', p[1])
                
            ### prevent pan activation ###
            d3.event.stopPropagation()
            ### prevent text selection ###
            d3.event.preventDefault()
        ))
        .on('mouseup.add_link', ((d) ->
            ### add link and update, but only if a link is actually added ###
            if graph.add_link(global.new_link_source, d)?
                update()
        ))
    

index.css

.node > circle {
  stroke-width: 4px;
}

.node > text {
  pointer-events: none;
  font-family: sans-serif;
  font-weight: bold;
  text-anchor: middle;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -o-user-select: none;
  user-select: none;
}

.link, .drag_link {
  stroke-width: 6px;
  stroke: gray;
  opacity: 0.5;
}

.drag_link {
  stroke-linecap: round;
}

.selected > circle {
  stroke-width: 8px;
}

.selected.link {
  stroke-width: 14px;
}

.overlay {
  fill: transparent;
}

.toolbar {
  position: absolute;
  top: 12px;
  left: 480px;
  width: 240px;
  margin-left: -120px;
  text-align: center;
}

.tool:not(:last-child) {
  margin-right: 10px;
}

.tool {
  fill: #a3a4c3;
  cursor: pointer;
}
.tool.active {
  fill: #b52d0c;
}

.library {
  border: 2px solid #a3a4c3;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.8);
  padding: 6px;
  margin-top: 10px;
}
.library svg {
  cursor: pointer;
}
.library svg:not(:last-child) {
  padding-right: 6px;
}

index.html

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>Graph editing tools</title>
        <link type="text/css" href="index.css" rel="stylesheet"/>
        <script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.js' type='text/javascript'></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script>
        <script src="index.js"></script>
    </head>
    <body onload="main()">
    </body>
</html>

index.js

(function() {
  var drag_add_link, global, graph, height, update, width,
    __indexOf = Array.prototype.indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (i in this && this[i] === item) return i; } return -1; };

  width = 960;

  height = 500;

  /* SELECTION - store the selected node
  */

  /* EDITING - store the drag mode (either 'drag' or 'add_link')
  */

  global = {
    selection: null
  };

  /* create some fake data
  */

  graph = {
    nodes: [
      {
        id: 'A',
        x: 469,
        y: 410,
        type: 'X'
      }, {
        id: 'B',
        x: 493,
        y: 364,
        type: 'X'
      }, {
        id: 'C',
        x: 442,
        y: 365,
        type: 'X'
      }, {
        id: 'D',
        x: 467,
        y: 314,
        type: 'X'
      }, {
        id: 'E',
        x: 477,
        y: 248,
        type: 'Y'
      }, {
        id: 'F',
        x: 425,
        y: 207,
        type: 'Y'
      }, {
        id: 'G',
        x: 402,
        y: 155,
        type: 'Y'
      }, {
        id: 'H',
        x: 369,
        y: 196,
        type: 'Y'
      }, {
        id: 'I',
        x: 350,
        y: 148,
        type: 'Z'
      }, {
        id: 'J',
        x: 539,
        y: 222,
        type: 'Z'
      }, {
        id: 'K',
        x: 594,
        y: 235,
        type: 'Z'
      }, {
        id: 'L',
        x: 582,
        y: 185,
        type: 'Z'
      }, {
        id: 'M',
        x: 633,
        y: 200,
        type: 'Z'
      }
    ],
    links: [
      {
        source: 'A',
        target: 'B'
      }, {
        source: 'B',
        target: 'C'
      }, {
        source: 'C',
        target: 'A'
      }, {
        source: 'B',
        target: 'D'
      }, {
        source: 'D',
        target: 'C'
      }, {
        source: 'D',
        target: 'E'
      }, {
        source: 'E',
        target: 'F'
      }, {
        source: 'F',
        target: 'G'
      }, {
        source: 'F',
        target: 'H'
      }, {
        source: 'G',
        target: 'H'
      }, {
        source: 'G',
        target: 'I'
      }, {
        source: 'H',
        target: 'I'
      }, {
        source: 'J',
        target: 'E'
      }, {
        source: 'J',
        target: 'L'
      }, {
        source: 'J',
        target: 'K'
      }, {
        source: 'K',
        target: 'L'
      }, {
        source: 'L',
        target: 'M'
      }, {
        source: 'M',
        target: 'K'
      }
    ],
    objectify: (function() {
      /* resolve node IDs (not optimized at all!)
      */
      var l, n, _i, _len, _ref, _results;
      _ref = graph.links;
      _results = [];
      for (_i = 0, _len = _ref.length; _i < _len; _i++) {
        l = _ref[_i];
        _results.push((function() {
          var _j, _len2, _ref2, _results2;
          _ref2 = graph.nodes;
          _results2 = [];
          for (_j = 0, _len2 = _ref2.length; _j < _len2; _j++) {
            n = _ref2[_j];
            if (l.source === n.id) {
              l.source = n;
              continue;
            }
            if (l.target === n.id) {
              l.target = n;
              continue;
            } else {
              _results2.push(void 0);
            }
          }
          return _results2;
        })());
      }
      return _results;
    }),
    remove: (function(condemned) {
      /* remove the given node or link from the graph, also deleting dangling links if a node is removed
      */      if (__indexOf.call(graph.nodes, condemned) >= 0) {
        graph.nodes = graph.nodes.filter(function(n) {
          return n !== condemned;
        });
        return graph.links = graph.links.filter(function(l) {
          return l.source.id !== condemned.id && l.target.id !== condemned.id;
        });
      } else if (__indexOf.call(graph.links, condemned) >= 0) {
        return graph.links = graph.links.filter(function(l) {
          return l !== condemned;
        });
      }
    }),
    last_index: 0,
    add_node: (function(type) {
      var n;
      n = {
        id: graph.last_index++,
        x: width / 2,
        y: height / 2,
        type: type
      };
      graph.nodes.push(n);
      return n;
    }),
    add_link: (function(source, target) {
      /* avoid links to self
      */
      var l, link, _i, _len, _ref;
      if (source === target) return null;
      /* avoid link duplicates
      */
      _ref = graph.links;
      for (_i = 0, _len = _ref.length; _i < _len; _i++) {
        link = _ref[_i];
        if (link.source === source && link.target === target) return null;
      }
      l = {
        source: source,
        target: target
      };
      graph.links.push(l);
      return l;
    })
  };

  graph.objectify();

  window.main = (function() {
    /* create the SVG
    */
    var container, library, svg, toolbar;
    svg = d3.select('body').append('svg').attr('width', width).attr('height', height);
    /* ZOOM and PAN
    */
    /* create container elements
    */
    container = svg.append('g');
    container.call(d3.behavior.zoom().scaleExtent([0.5, 8]).on('zoom', (function() {
      return global.vis.attr('transform', "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")");
    })));
    global.vis = container.append('g');
    /* create a rectangular overlay to catch events
    */
    /* WARNING rect size is huge but not infinite. this is a dirty hack
    */
    global.vis.append('rect').attr('class', 'overlay').attr('x', -500000).attr('y', -500000).attr('width', 1000000).attr('height', 1000000).on('click', (function(d) {
      /* SELECTION
      */      global.selection = null;
      d3.selectAll('.node').classed('selected', false);
      return d3.selectAll('.link').classed('selected', false);
    }));
    /* END ZOOM and PAN
    */
    global.colorify = d3.scale.category10();
    /* initialize the force layout
    */
    global.force = d3.layout.force().size([width, height]).charge(-400).linkDistance(60).on('tick', (function() {
      /* update nodes and links
      */      global.vis.selectAll('.node').attr('transform', function(d) {
        return "translate(" + d.x + "," + d.y + ")";
      });
      return global.vis.selectAll('.link').attr('x1', function(d) {
        return d.source.x;
      }).attr('y1', function(d) {
        return d.source.y;
      }).attr('x2', function(d) {
        return d.target.x;
      }).attr('y2', function(d) {
        return d.target.y;
      });
    }));
    /* DRAG
    */
    global.drag = global.force.drag().on('dragstart', function(d) {
      return d.fixed = true;
    });
    /* DELETION - pressing DEL deletes the selection
    */
    d3.select(window).on('keydown', function() {
      if (d3.event.keyCode === 46) {
        if (global.selection != null) {
          graph.remove(global.selection);
          global.selection = null;
          return update();
        }
      }
    });
    update();
    /* TOOLBAR
    */
    toolbar = $("<div class='toolbar'></div>");
    $('body').append(toolbar);
    toolbar.append($("<svg\n    class='active tool'\n    data-tool='pointer'\n    xmlns='http://www.w3.org/2000/svg'\n    version='1.1'\n    width='32'\n    height='32'\n    viewBox='0 0 128 128'>\n    <g transform='translate(881.10358,-356.22543)'>\n      <g transform='matrix(0.8660254,-0.5,0.5,0.8660254,-266.51112,-215.31898)'>\n        <path\n           d='m -797.14902,212.29589 a 5.6610848,8.6573169 0 0 0 -4.61823,4.3125 l -28.3428,75.0625 a 5.6610848,8.6573169 0 0 0 4.90431,13 l 56.68561,0 a 5.6610848,8.6573169 0 0 0 4.9043,-13 l -28.3428,-75.0625 a 5.6610848,8.6573169 0 0 0 -5.19039,-4.3125 z m 0.28608,25.96875 18.53419,49.09375 -37.06838,0 18.53419,-49.09375 z'\n        />\n        <path\n           d='m -801.84375,290.40625 c -2.09434,2.1e-4 -3.99979,1.90566 -4,4 l 0,35.25 c 2.1e-4,2.09434 1.90566,3.99979 4,4 l 10,0 c 2.09434,-2.1e-4 3.99979,-1.90566 4,-4 l 0,-35.25 c -2.1e-4,-2.09434 -1.90566,-3.99979 -4,-4 z'\n        />\n      </g>\n    </g>\n</svg>"));
    toolbar.append($("<svg\n    class='tool'\n    data-tool='add_node'\n    xmlns='http://www.w3.org/2000/svg'\n    version='1.1'\n    width='32'\n    height='32'\n    viewBox='0 0 128 128'>\n    <g transform='translate(720.71649,-356.22543)'>\n      <g transform='translate(-3.8571429,146.42857)'>\n        <path\n           d='m -658.27638,248.37149 c -1.95543,0.19978 -3.60373,2.03442 -3.59375,4 l 0,12.40625 -12.40625,0 c -2.09434,2.1e-4 -3.99979,1.90566 -4,4 l 0,10 c -0.007,0.1353 -0.007,0.27095 0,0.40625 0.19978,1.95543 2.03442,3.60373 4,3.59375 l 12.40625,0 0,12.4375 c 2.1e-4,2.09434 1.90566,3.99979 4,4 l 10,0 c 2.09434,-2.1e-4 3.99979,-1.90566 4,-4 l 0,-12.4375 12.4375,0 c 2.09434,-2.1e-4 3.99979,-1.90566 4,-4 l 0,-10 c -2.1e-4,-2.09434 -1.90566,-3.99979 -4,-4 l -12.4375,0 0,-12.40625 c -2.1e-4,-2.09434 -1.90566,-3.99979 -4,-4 l -10,0 c -0.1353,-0.007 -0.27095,-0.007 -0.40625,0 z'\n        />\n        <path\n           d='m -652.84375,213.9375 c -32.97528,0 -59.875,26.86847 -59.875,59.84375 0,32.97528 26.89972,59.875 59.875,59.875 32.97528,0 59.84375,-26.89972 59.84375,-59.875 0,-32.97528 -26.86847,-59.84375 -59.84375,-59.84375 z m 0,14 c 25.40911,0 45.84375,20.43464 45.84375,45.84375 0,25.40911 -20.43464,45.875 -45.84375,45.875 -25.40911,0 -45.875,-20.46589 -45.875,-45.875 0,-25.40911 20.46589,-45.84375 45.875,-45.84375 z'\n        />\n      </g>\n    </g>\n</svg>"));
    toolbar.append($("<svg\n    class='tool'\n    data-tool='add_link'\n    xmlns='http://www.w3.org/2000/svg'\n    version='1.1'\n    width='32'\n    height='32'\n    viewBox='0 0 128 128'>\n<g transform='translate(557.53125,-356.22543)'>\n    <g transform='translate(20,0)'>\n      <path\n         d='m -480.84375,360 c -15.02602,0 -27.375,12.31773 -27.375,27.34375 0,4.24084 1.00221,8.28018 2.75,11.875 l -28.875,28.875 c -3.59505,-1.74807 -7.6338,-2.75 -11.875,-2.75 -15.02602,0 -27.34375,12.34898 -27.34375,27.375 0,15.02602 12.31773,27.34375 27.34375,27.34375 15.02602,0 27.375,-12.31773 27.375,-27.34375 0,-4.26067 -0.98685,-8.29868 -2.75,-11.90625 L -492.75,411.96875 c 3.60156,1.75589 7.65494,2.75 11.90625,2.75 15.02602,0 27.34375,-12.34898 27.34375,-27.375 C -453.5,372.31773 -465.81773,360 -480.84375,360 z m 0,14 c 7.45986,0 13.34375,5.88389 13.34375,13.34375 0,7.45986 -5.88389,13.375 -13.34375,13.375 -7.45986,0 -13.375,-5.91514 -13.375,-13.375 0,-7.45986 5.91514,-13.34375 13.375,-13.34375 z m -65.375,65.34375 c 7.45986,0 13.34375,5.91514 13.34375,13.375 0,7.45986 -5.88389,13.34375 -13.34375,13.34375 -7.45986,0 -13.34375,-5.88389 -13.34375,-13.34375 0,-7.45986 5.88389,-13.375 13.34375,-13.375 z'\n      />\n      <path\n         d='m -484.34375,429.25 c -1.95543,0.19978 -3.60373,2.03442 -3.59375,4 l 0,12.40625 -12.40625,0 c -2.09434,2.1e-4 -3.99979,1.90566 -4,4 l 0,10 c -0.007,0.1353 -0.007,0.27095 0,0.40625 0.19978,1.95543 2.03442,3.60373 4,3.59375 l 12.40625,0 0,12.4375 c 2.1e-4,2.09434 1.90566,3.99979 4,4 l 10,0 c 2.09434,-2.1e-4 3.99979,-1.90566 4,-4 l 0,-12.4375 12.4375,0 c 2.09434,-2.1e-4 3.99979,-1.90566 4,-4 l 0,-10 c -2.1e-4,-2.09434 -1.90566,-3.99979 -4,-4 l -12.4375,0 0,-12.40625 c -2.1e-4,-2.09434 -1.90566,-3.99979 -4,-4 l -10,0 c -0.1353,-0.007 -0.27095,-0.007 -0.40625,0 z'\n      />\n    </g>\n  </g>\n</svg>"));
    library = $("<div class='library'></div></div>");
    toolbar.append(library);
    ['X', 'Y', 'Z', 'W'].forEach(function(type) {
      var new_btn;
      new_btn = $("<svg width='42' height='42'>\n    <g class='node'>\n        <circle\n            cx='21'\n            cy='21'\n            r='18'\n            stroke='" + (global.colorify(type)) + "'\n            fill='" + (d3.hcl(global.colorify(type)).brighter(3)) + "'\n        />\n    </g>\n</svg>");
      new_btn.bind('click', function() {
        graph.add_node(type);
        return update();
      });
      library.append(new_btn);
      return library.hide();
    });
    global.tool = 'pointer';
    global.new_link_source = null;
    global.vis.on('mousemove.add_link', (function(d) {
      /* check if there is a new link in creation
      */
      var p;
      if (global.new_link_source != null) {
        /* update the draggable link representation
        */
        p = d3.mouse(global.vis.node());
        return global.drag_link.attr('x1', global.new_link_source.x).attr('y1', global.new_link_source.y).attr('x2', p[0]).attr('y2', p[1]);
      }
    })).on('mouseup.add_link', (function(d) {
      global.new_link_source = null;
      /* remove the draggable link representation, if exists
      */
      if (global.drag_link != null) return global.drag_link.remove();
    }));
    return d3.selectAll('.tool').on('click', function() {
      var new_tool, nodes;
      d3.selectAll('.tool').classed('active', false);
      d3.select(this).classed('active', true);
      new_tool = $(this).data('tool');
      nodes = global.vis.selectAll('.node');
      if (new_tool === 'add_link' && global.tool !== 'add_link') {
        /* remove drag handlers from nodes
        */
        nodes.on('mousedown.drag', null).on('touchstart.drag', null);
        /* add drag handlers for the add_link tool
        */
        nodes.call(drag_add_link);
      } else if (new_tool !== 'add_link' && global.tool === 'add_link') {
        /* remove drag handlers for the add_link tool
        */
        nodes.on('mousedown.add_link', null).on('mouseup.add_link', null);
        /* add drag behavior to nodes
        */
        nodes.call(global.drag);
      }
      if (new_tool === 'add_node') {
        library.show();
      } else {
        library.hide();
      }
      return global.tool = new_tool;
    });
  });

  update = function() {
    /* update the layout
    */
    var links, new_nodes, nodes;
    global.force.nodes(graph.nodes).links(graph.links).start();
    /* create nodes and links
    */
    /* (links are drawn with insert to make them appear under the nodes)
    */
    /* also define a drag behavior to drag nodes
    */
    /* dragged nodes become fixed
    */
    nodes = global.vis.selectAll('.node').data(graph.nodes, function(d) {
      return d.id;
    });
    new_nodes = nodes.enter().append('g').attr('class', 'node').on('click', (function(d) {
      /* SELECTION
      */      global.selection = d;
      d3.selectAll('.node').classed('selected', function(d2) {
        return d2 === d;
      });
      return d3.selectAll('.link').classed('selected', false);
    }));
    links = global.vis.selectAll('.link').data(graph.links, function(d) {
      return "" + d.source.id + "->" + d.target.id;
    });
    links.enter().insert('line', '.node').attr('class', 'link').on('click', (function(d) {
      /* SELECTION
      */      global.selection = d;
      d3.selectAll('.link').classed('selected', function(d2) {
        return d2 === d;
      });
      return d3.selectAll('.node').classed('selected', false);
    }));
    links.exit().remove();
    /* TOOLBAR - add link tool initialization for new nodes
    */
    if (global.tool === 'add_link') {
      new_nodes.call(drag_add_link);
    } else {
      new_nodes.call(global.drag);
    }
    new_nodes.append('circle').attr('r', 18).attr('stroke', function(d) {
      return global.colorify(d.type);
    }).attr('fill', function(d) {
      return d3.hcl(global.colorify(d.type)).brighter(3);
    });
    /* draw the label
    */
    new_nodes.append('text').text(function(d) {
      return d.id;
    }).attr('dy', '0.35em').attr('fill', function(d) {
      return global.colorify(d.type);
    });
    return nodes.exit().remove();
  };

  drag_add_link = function(selection) {
    return selection.on('mousedown.add_link', (function(d) {
      var p;
      global.new_link_source = d;
      /* create the draggable link representation
      */
      p = d3.mouse(global.vis.node());
      global.drag_link = global.vis.insert('line', '.node').attr('class', 'drag_link').attr('x1', d.x).attr('y1', d.y).attr('x2', p[0]).attr('y2', p[1]);
      /* prevent pan activation
      */
      d3.event.stopPropagation();
      /* prevent text selection
      */
      return d3.event.preventDefault();
    })).on('mouseup.add_link', (function(d) {
      /* add link and update, but only if a link is actually added
      */      if (graph.add_link(global.new_link_source, d) != null) return update();
    }));
  };

}).call(this);

index.sass

.node > circle
    stroke-width: 4px
    
.node > text
    pointer-events: none
    font-family: sans-serif
    font-weight: bold
    text-anchor: middle
    
    // prevent text selection
    -webkit-user-select: none 
    -moz-user-select: none
    -ms-user-select: none
    -o-user-select: none
    user-select: none
    
// editing
.link, .drag_link
    stroke-width: 6px
    stroke: gray
    opacity: 0.5
    
.drag_link
    stroke-linecap: round
    
// selection
.selected > circle
    stroke-width: 8px
    
.selected.link
    stroke-width: 14px
    
// zoom and pan
.overlay
    fill: transparent
    
// toolbar
.toolbar
    position: absolute
    top: 12px
    left: 480px
    width: 240px
    margin-left: -120px
    text-align: center
    
.tool:not(:last-child)
    margin-right: 10px
    
.tool
    fill: #A3A4C3
    cursor: pointer
    &.active
        fill: #B52D0C
        
.library
    border: 2px solid #A3A4C3
    border-radius: 6px
    background: rgba(255,255,255,0.8)
    padding: 6px
    margin-top: 10px
    
    svg
        cursor: pointer
        
    svg:not(:last-child)
        padding-right: 6px