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如何在 d3.js 中反转图中节点的方向

分类：编程问答

如何解决如何在 d3.js 中反转图中节点的方向

所以我使用 d3.js 来显示节点图。现在父母从左边开始，孩子在右边。有什么办法可以反转那个方向，让孩子在左边，父母在右边。

下面是显示树节点的函数渲染树。例如，我将 renderTree 称为 vm.renderTree(vm.tree,"#tree-container");

  vm.renderTree = function (treeData,treeId) {
    var totalNodes = 0;
    var maxLabelLength = 0;
    var selectednode = null;
    var draggingNode = null;
    var panSpeed = 200;
    var panBoundary = 20;
    var i = 0;
    var duration = 750;
    var root;
    var viewerWidth = $(document).width();
    var viewerHeight = $(document).height();
    vm.tree = d3.layout.tree()
        .size([viewerHeight,viewerWidth]);
    var diagonal = d3.svg.diagonal()
        .projection(function (d) {
        return [d.y,d.x];
    });
    function visit(parent,visitFn,childrenFn) {
        if (!parent)
            return;
        visitFn(parent);
        var children = childrenFn(parent);
        if (children) {
            var count = children.length;
            for (var i = 0; i < count; i++) {
                visit(children[i],childrenFn);
            }
        }
    }
    visit(treeData,function (d) {
        totalNodes++;
        if (typeof d.lename !== "undefined") {
            if (treeId == "#tree-container-legalTree") {
                maxLabelLength = Math.max(d.lename.length,maxLabelLength);
            }
            else {
                maxLabelLength = Math.max(d.name.length,maxLabelLength);
            }
        }
    },function (d) {
        return d.children && d.children.length > 0 ? d.children : null;
    });
    var sortTree = function () {
        vm.tree.sort(function (a,b) {
            if (typeof d !== "undefined") {
                if (treeId == "#tree-container-legalTree") {
                    return b.lename.toLowerCase() < a.lename.toLowerCase() ? 1 : -1;
                }
                else {
                    return b.name.toLowerCase() < a.name.toLowerCase() ? 1 : -1;
                }
            }
        });
    };
    sortTree();
    var pan = function (domNode,direction) {
        var speed = panSpeed;
        if (panTimer) {
            clearTimeout(panTimer);
            var translateCoords = d3.transform(svgGroup.attr("transform"));
            if (direction == 'left' || direction == 'right') {
                translateX = direction == 'left' ? translateCoords.translate[0] + speed : translateCoords.translate[0] - speed;
                translateY = translateCoords.translate[1];
            }
            else if (direction == 'up' || direction == 'down') {
                translateX = translateCoords.translate[0];
                translateY = direction == 'up' ? translateCoords.translate[1] + speed : translateCoords.translate[1] - speed;
            }
            scaleX = translateCoords.scale[0];
            scaleY = translateCoords.scale[1];
            scale = zoomListener.scale();
            svgGroup.transition().attr("transform","translate(" + translateX + "," + translateY + ")scale(" + scale + ")");
            d3.select(domNode).select('g.node').attr("transform"," + translateY + ")");
            zoomListener.scale(zoomListener.scale());
            zoomListener.translate([translateX,translateY]);
            panTimer = setTimeout(function () {
                pan(domNode,speed,direction);
            },50);
        }
    };
    function zoom() {
        svgGroup.attr("transform","translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")");
    }
    var zoomListener = d3.behavior.zoom().scaleExtent([0.1,3]).on("zoom",zoom);
    var initiateDrag = function (d,domNode) {
        draggingNode = d;
        d3.select(domNode).select('.ghostCircle').attr('pointer-events','none');
        d3.selectAll('.ghostCircle').attr('class','ghostCircle show');
        d3.select(domNode).attr('class','node activeDrag');
        svgGroup.selectAll("g.node").sort(function (a,b) {
            if (a.id != draggingNode.id)
                return 1;
            else
                return -1;
        });
        if (nodes.length > 1) {
            links = vm.tree.links(nodes);
            nodePaths = svgGroup.selectAll("path.link")
                .data(links,function (d) {
                return d.target.id;
            }).remove();
            nodesExit = svgGroup.selectAll("g.node")
                .data(nodes,function (d) {
                return d.id;
            }).filter(function (d,i) {
                if (d.id == draggingNode.id) {
                    return false;
                }
                return true;
            }).remove();
        }
        parentLink = vm.tree.links(vm.tree.nodes(draggingNode.parent));
        svgGroup.selectAll('path.link').filter(function (d,i) {
            if (d.target.id == draggingNode.id) {
                return true;
            }
            return false;
        }).remove();
        dragStarted = null;
    };
    var baseSvg = d3.select(treeId).append("svg")
        .attr("width",viewerWidth)
        .attr("height",viewerHeight)
        .attr("class","overlay")
        .call(zoomListener);
    dragListener = d3.behavior.drag()
        .on("dragstart",function (d) {
        if (d == root) {
            return;
        }
        dragStarted = true;
        nodes = vm.tree.nodes(d);
        d3.event.sourceEvent.stopPropagation();
    })
        .on("drag",function (d) {
        if (d == root) {
            return;
        }
        if (dragStarted) {
            domNode = vm;
            initiateDrag(d,domNode);
        }
        var relCoords = d3.mouse($('svg').get(0));
        if (relCoords[0] < panBoundary) {
            panTimer = true;
            pan(vm,'left');
        }
        else if (relCoords[0] > ($('svg').width() - panBoundary)) {
            panTimer = true;
            pan(vm,'right');
        }
        else if (relCoords[1] < panBoundary) {
            panTimer = true;
            pan(vm,'up');
        }
        else if (relCoords[1] > ($('svg').height() - panBoundary)) {
            panTimer = true;
            pan(vm,'down');
        }
        else {
            try {
                clearTimeout(panTimer);
            }
            catch (e) {
            }
        }
        d.x0 += d3.event.dy;
        d.y0 += d3.event.dx;
        var node = d3.select(vm);
        node.attr("transform","translate(" + d.y0 + "," + d.x0 + ")");
        updateTempConnector();
    }).on("dragend",function (d) {
        if (d == root) {
            return;
        }
        domNode = vm;
        if (selectednode) {
            var index = draggingNode.parent.children.indexOf(draggingNode);
            if (index > -1) {
                draggingNode.parent.children.splice(index,1);
            }
            if (typeof selectednode.children !== 'undefined' || typeof selectednode._children !== 'undefined') {
                if (typeof selectednode.children !== 'undefined') {
                    selectednode.children.push(draggingNode);
                }
                else {
                    selectednode._children.push(draggingNode);
                }
            }
            else {
                selectednode.children = [];
                selectednode.children.push(draggingNode);
            }
            expand(selectednode);
            sortTree();
            endDrag();
        }
        else {
            endDrag();
        }
    });
    function endDrag() {
        selectednode = null;
        d3.selectAll('.ghostCircle').attr('class','ghostCircle');
        d3.select(domNode).attr('class','node');
        d3.select(domNode).select('.ghostCircle').attr('pointer-events','');
        updateTempConnector();
        if (draggingNode !== null) {
            update(root);
            centerNode(draggingNode);
            draggingNode = null;
        }
    }
    function collapse(d) {
        if (d.children) {
            d._children = d.children;
            d._children.forEach(collapse);
            d.children = null;
        }
    }
    function expand(d) {
        if (d._children) {
            d.children = d._children;
            d.children.forEach(expand);
            d._children = null;
        }
    }
    var overCircle = function (d) {
        selectednode = d;
        updateTempConnector();
    };
    var outCircle = function (d) {
        selectednode = null;
        updateTempConnector();
    };
    var updateTempConnector = function () {
        var data = [];
        if (draggingNode !== null && selectednode !== null) {
            data = [{
                    source: {
                        x: selectednode.y0,y: selectednode.x0
                    },target: {
                        x: draggingNode.y0,y: draggingNode.x0
                    }
                }];
        }
        var link = svgGroup.selectAll(".templink").data(data);
        link.enter().append("path")
            .attr("class","templink")
            .attr("d",d3.svg.diagonal())
            .attr('pointer-events','none');
        link.attr("d",d3.svg.diagonal());
        link.exit().remove();
    };
    function centerNode(source) {
        scale = zoomListener.scale();
        x = -source.y0;
        y = -source.x0;
        x = 150;
        y = y * scale + viewerHeight / 2;
        d3.select('g').transition()
            .duration(duration)
            .attr("transform","translate(" + x + "," + y + ")scale(" + scale + ")");
        zoomListener.scale(scale);
        zoomListener.translate([x,y]);
    }
    function toggleChildren(d) {
        if (d.children) {
            d._children = d.children;
            d.children = null;
        }
        else if (d._children) {
            d.children = d._children;
            d._children = null;
        }
        return d;
    }
    function click(d) {
        if (d3.event.defaultPrevented)
            return;
        d = toggleChildren(d);
        update(d);
        centerNode(d);
    }
    var update = function (source) {
        var levelWidth = [1];
        var childCount = function (level,n) {
            if (n.children && n.children.length > 0) {
                if (levelWidth.length <= level + 1)
                    levelWidth.push(0);
                levelWidth[level + 1] += n.children.length;
                n.children.forEach(function (d) {
                    childCount(level + 1,d);
                });
            }
        };
        childCount(0,root);
        var newHeight = d3.max(levelWidth) * 25;
        vm.tree = vm.tree.size([newHeight,viewerWidth]);
        var nodes = vm.tree.nodes(root).reverse(),links = vm.tree.links(nodes);
        nodes.forEach(function (d) {
            d.y = (d.depth * (maxLabelLength * 10));
        });
        node = svgGroup.selectAll("g.node")
            .data(nodes,function (d) {
            return d.id || (d.id = ++i);
        });
        var nodeEnter = node.enter().append("g")
            .call(dragListener)
            .attr("class","node")
            .attr("transform",function (d) {
            return "translate(" + source.y0 + "," + source.x0 + ")";
        })
            .on('click',click);
        nodeEnter.append("circle")
            .attr('class','nodeCircle')
            .attr("r",0)
            .style("fill",function (d) {
            return d._children ? "lightsteelblue" : "#fff";
        });
        nodeEnter.append("text")
            .attr("x",function (d) {
            return d.children || d._children ? -10 : 10;
        })
            .attr("dy",".35em")
            .attr('class','nodeText')
            .attr("text-anchor",function (d) {
            return d.children || d._children ? "end" : "start";
        })
            .text(function (d) {
                if (vm.showName == "LE Name") {
                    if (treeId == "#tree-container-legalTree") {
                        return d.lename;
                    }
                    return d.name;
                }
               
        })
            .style("fill-opacity",0);
        nodeEnter.append("circle")
            .attr('class','ghostCircle')
            .attr("r",30)
            .attr("opacity",0.2)
            .style("fill","red")
            .attr('pointer-events','mouSEOver')
            .on("mouSEOver",function (node) {
            overCircle(node);
        })
            .on("mouSEOut",function (node) {
            outCircle(node);
        });
        node.select('text')
            .attr("x",function (d) {
            return d.children || d._children ? -10 : 10;
        })
            .attr("text-anchor",function (d) {
            return d.children || d._children ? "end" : "start";
        })
            .text(function (d) {
                if (vm.showName == "LE Name") {
                    if (treeId == "#tree-container-legalTree") {
                        return d.lename;
                    }
                    return d.name;
                }
               
        });
        node.select("circle.nodeCircle")
            .attr("r",4.5)
            .style("fill",function (d) {
            return d._children ? "lightsteelblue" : "#fff";
        });
        var nodeUpdate = node.transition()
            .duration(duration)
            .attr("transform",function (d) {
            return "translate(" + d.y + "," + d.x + ")";
        });
        nodeUpdate.select("text")
            .style("fill-opacity",1);
        var nodeExit = node.exit().transition()
            .duration(duration)
            .attr("transform",function (d) {
            return "translate(" + source.y + "," + source.x + ")";
        })
            .remove();
        nodeExit.select("circle")
            .attr("r",0);
        nodeExit.select("text")
            .style("fill-opacity",0);
        var link = svgGroup.selectAll("path.link")
            .data(links,function (d) {
            return d.target.id;
        });
        link.enter().insert("path","g")
            .attr("class","link")
            .attr("d",function (d) {
            var o = {
                x: source.x0,y: source.y0
            };
            return diagonal({
                source: o,target: o
            });
        });
        link.transition()
            .duration(duration)
            .attr("d",diagonal);
        link.exit().transition()
            .duration(duration)
            .attr("d",function (d) {
            var o = {
                x: source.x,y: source.y
            };
            return diagonal({
                source: o,target: o
            });
        })
            .remove();
        nodes.forEach(function (d) {
            d.x0 = d.x;
            d.y0 = d.y;
        });
    };
    var svgGroup = baseSvg.append("g");
    root = treeData;
    root.x0 = viewerHeight / 2;
    root.y0 = 0;
    update(root);
    centerNode(root);
};

以下是treeData的例子

{
  "id": 1,"code": "a","name": "b","type": "t","leId": 2,"leName": "d","children": [
    {
      "id": 2,"code": "e","name": "f","type": "g","leId": 4,"lename": "e","childrenCount": 0
    }
  ],"childrenCount": 1
}

解决方法

这是一个反向树的片段。

用 d.y 替换 height - d.y，交换文本位置 (start / end) 并修改对链接的 diagonal 调用：

var data = [
    { "name" : "Level 2: A","parent":"Top Level" },{ "name" : "Top Level","parent":"null" },{ "name" : "Son of A","parent":"Level 2: A" },{ "name" : "Daughter of A",{ "name" : "Level 2: B","parent":"Top Level" }
    ];

// *********** Convert flat data into a nice tree ***************
// create a name: node map
var dataMap = data.reduce(function(map,node) {
    map[node.name] = node;
    return map;
},{});

// create the tree array
var treeData = [];
data.forEach(function(node) {
    // add to parent
    var parent = dataMap[node.parent];
    if (parent) {
        // create child array if it doesn't exist
        (parent.children || (parent.children = []))
            // add node to child array
            .push(node);
    } else {
        // parent is null or missing
        treeData.push(node);
    }
});

// ************** Generate the tree diagram  *****************
var margin = {top: 20,right: 120,bottom: 20,left: 120},width = 960 - margin.right - margin.left,height = 500 - margin.top - margin.bottom;
    
var i = 0;

var tree = d3.layout.tree()
    .size([height,width]);

var diagonal = d3.svg.diagonal()
    .projection(function(d) { return [d.y,d.x]; });

var svg = d3.select("body").append("svg")
    .attr("width",width + margin.right + margin.left)
    .attr("height",height + margin.top + margin.bottom)
  .append("g")
    .attr("transform","translate(" + margin.left + "," + margin.top + ")");

root = treeData[0];
  
update(root);

function update(source) {

  // Compute the new tree layout.
  var nodes = tree.nodes(root).reverse(),links = tree.links(nodes);

  // Normalize for fixed-depth.
  nodes.forEach(function(d) { d.y = d.depth * 180; });

  // Declare the nodes…
  var node = svg.selectAll("g.node")
      .data(nodes,function(d) { return d.id || (d.id = ++i); });

  // Enter the nodes.
  var nodeEnter = node.enter().append("g")
      .attr("class","node")
      .attr("transform",function(d) { 
          return "translate(" + (height - d.y) + "," + d.x + ")"; });

  nodeEnter.append("circle")
      .attr("r",10)
      .style("fill","#fff");

  nodeEnter.append("text")
      .attr("x",function(d) { 
          return d.children || d._children ? 13 : -13; })
      .attr("dy",".35em")
      .attr("text-anchor",function(d) { 
          return d.children || d._children ? "start" : "end"; })
      .text(function(d) { return d.name; })
      .style("fill-opacity",1);

  // Declare the links…
  var link = svg.selectAll("path.link")
      .data(links,function(d) { return d.target.id; });

  // Enter the links.
  link.enter().insert("path","g")
      .attr("class","link")
      .attr("d",d => {
        console.log(d);
      const source = {x: d.source.x,y: height - d.source.y};
      const target = {x: d.target.x,y: height - d.target.y};
        return diagonal({source,target});
        //diagonal({x: d.x,y: height - d.y})
    });

}
    .node circle {
      fill: #fff;
      stroke: steelblue;
      stroke-width: 3px;
    }

    .node text { font: 12px sans-serif; }

    .link {
      fill: none;
      stroke: #ccc;
      stroke-width: 2px;
    }
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.7/d3.min.js"></script>

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