d3.js - 在 a 内的两个元素之间放置一条线有缩放事件？
问题描述
我有这段代码，并且我有一个算法可以在两个nodes. 我希望这条线将 the#nodo4与 the连接起来#nodo6，并且每个rectangles都nodes与其同名id。
代码有点长，但实现这一点的重要部分在这里：
setTimeout(() => {
let source = d3.select("#node4");
let target = d3.select("#node6");
source.datum(source.node().getBoundingClientRect())
.attr('nodeX', d => d.x + d.width / 2)
.attr('nodeY', d => d.y + d.height / 2)
target.datum(target.node().getBoundingClientRect())
.attr('nodeX', d => d.x + d.width / 2)
.attr('nodeY', d => d.y + d.height / 2)
d3.select("#g_main").append("line")
.style("stroke", "black") // colour the line
.attr("x1", source.attr('nodeX')) // x position of the first end of the line
.attr("y1", source.attr('nodeY')) // y position of the first end of the line
.attr("x2", target.attr('nodeX')) // x position of the second end of the line
.attr("y2", target.attr('nodeY')); // y position of the second end of the line
}, 5000)
但考虑到我可以不断缩放和平移，我无法让线条出现在应有的位置。我想要一个动态解决方案，因为将来我想放置一条连接到其他节点的线，并且我想做这个动态计算。我究竟做错了什么？
var width = 960,
height = 800;
var i = 0,
duration = 750,
rectW = 100,
rectH = 30;
var tree = d3.layout.tree().nodeSize([220, 40]);
var diagonal = d3.svg.diagonal()
.projection(function(d) {
return [d.x + rectW / 2, d.y + rectH / 2];
});
var svg = d3.select("#body").append("svg").attr("width", 1000).attr("height", 1000).style("border", "1px solid red")
.call(zm = d3.behavior.zoom().scaleExtent([0.3, 3]).on("zoom", redraw)).append("g").attr("id", "g_main")
.attr("transform", "translate(" + 350 + "," + 20 + ")");
//necessary so that zoom knows where to zoom and unzoom from
zm.translate([350, 20]);
var root = {
"name": "node6",
"children": [{
"name": "node5",
"respuesta": "SI",
"children": [{
"name": "node4",
"children": [{
"name": "node3"
}]
}]
}, {
"name": "node2",
"respuesta": "NO"
},
{
"name": "node1",
"respuesta": "SI"
}
]
}
root.x0 = 0;
root.y0 = height / 2;
root.children.forEach(collapse);
update(root);
root.x0 = 0;
root.y0 = height / 2;
setTimeout(() => {
let source = d3.select("#node4");
let target = d3.select("#node6");
source.datum(source.node().getBoundingClientRect())
.attr('nodeX', d => d.x + d.width / 2)
.attr('nodeY', d => d.y + d.height / 2)
target.datum(target.node().getBoundingClientRect())
.attr('nodeX', d => d.x + d.width / 2)
.attr('nodeY', d => d.y + d.height / 2)
d3.select("#g_main").append("line")
.style("stroke", "black") // colour the line
.attr("x1", source.attr('nodeX')) // x position of the first end of the line
.attr("y1", source.attr('nodeY')) // y position of the first end of the line
.attr("x2", target.attr('nodeX')) // x position of the second end of the line
.attr("y2", target.attr('nodeY')); // y position of the second end of the line
}, 5000)
function collapse(d) {
if (d.children) {
d._children = d.children;
d._children.forEach(collapse);
// d.children = null;
}
}
root.children.forEach(collapse);
update(root);
d3.select("#body").style("height", "800px");
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;
});
// Update the nodes…
var node = svg.selectAll("g.node")
.data(nodes, function(d) {
return d.id || (d.id = ++i);
});
// Enter any new nodes at the parent's previous position.
var nodeEnter = node.enter().append("g")
.attr("class", "node")
.attr("transform", function(d) {
return "translate(" + source.x0 + "," + source.y0 + ")";
})
nodeEnter.append("rect")
.attr("id", function(d) {
return "node" + d.id
})
.attr("width", rectW)
.attr("height", rectH)
.attr("stroke", "white")
.attr("stroke-width", 1)
.style("fill", function(d) {
return d._children ? "lightsteelblue" : "#fff";
});
nodeEnter.append("image").attr("href", "plus-flat.png").attr("width", (d) => {
let length = 0;
if (d.children) {
length = d.children.length;
} else {
length = 0;
}
if (d.name == "INICIO" && length == 0) {
return 0;
} else if (d.name == "INICIO" && length != 0) {
return 0;
} else {
return 25;
}
}).style("transform", "translate(65px, -10px)")
nodeEnter.append("text")
.attr("x", rectW / 2)
.attr("y", rectH / 2)
.attr("dy", ".35em")
.text(function(d) {
return d.name;
})
// Transition nodes to their new position.
var nodeUpdate = node.transition()
.duration(duration)
.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
});
nodeUpdate.select("rect")
.attr("width", rectW)
.attr("height", rectH)
.attr("stroke", "black")
.attr("stroke-width", 1)
.style("fill", function(d) {
return d._children ? "lightsteelblue" : "#fff";
});
nodeUpdate.select("text")
.style("fill-opacity", 1);
// Transition exiting nodes to the parent's new position.
var nodeExit = node.exit().transition()
.duration(duration)
.attr("transform", function(d) {
return "translate(" + source.x + "," + source.y + ")";
})
.remove();
nodeExit.select("rect")
.attr("width", rectW)
.attr("height", rectH)
//.attr("width", bbox.getBBox().width)""
//.attr("height", bbox.getBBox().height)
.attr("stroke", "black")
.attr("stroke-width", 1);
nodeExit.select("text");
// Update the links…
var link = svg.selectAll("path.link")
.data(links, function(d) {
return d.target.id;
});
// Enter any new links at the parent's previous position.
link.enter().insert("path", "g")
.attr("class", "link")
.style("stroke", (d) => {
let respuesta = d.target.respuesta;
if (respuesta == "SI") {
return "#2a8841";
} else if (respuesta == "NO") {
return "#d44646";
} else {
return "#b7b7b7";
}
})
.attr("x", rectW / 2)
.attr("y", rectH / 2)
.attr("d", function(d) {
var o = {
x: source.x0,
y: source.y0
};
return diagonal({
source: o,
target: o
});
});
// Transition links to their new position.
link.transition()
.duration(duration)
.attr("d", diagonal);
// Transition exiting nodes to the parent's new position.
link.exit().transition()
.duration(duration)
.attr("d", function(d) {
var o = {
x: source.x,
y: source.y
};
return diagonal({
source: o,
target: o
});
})
.remove();
link.append("text").text("otros")
// Stash the old positions for transition.
nodes.forEach(function(d) {
d.x0 = d.x;
d.y0 = d.y;
});
}
// Toggle children on click.
function click(d) {
if (d.children) {
d._children = d.children;
d.children = null;
} else {
d.children = d._children;
d._children = null;
}
update(d);
}
//Redraw for zoom
function redraw() {
//console.log("here", d3.event.translate, d3.event.scale);
svg.attr("transform",
"translate(" + d3.event.translate + ")" +
" scale(" + d3.event.scale + ")");
}.node {
cursor: pointer;
}
.node circle {
fill: #fff;
stroke: steelblue;
stroke-width: 1.5px;
}
.node text {
font: 10px sans-serif;
}
.link {
fill: none;
stroke: #ccc;
stroke-width: 1.5px;
}
body {
overflow: hidden;
}<script src="https://d3js.org/d3.v3.js"></script>
<div id="body"></div>预期的结果，是这样的：
解决方案
不要覆盖datum源和目标。这意味着您将无法重新绘制树，因为您覆盖了它所需的所有值。
另外，不要使用getBoundingClientRect(). 如果您缩放或平移怎么办？它会扭曲，并且线永远不会在正确的位置。
相反，依靠你已经给节点的数据，你已经拥有它，你可以通过.datum()不带参数的调用来访问它！然后，计算节点的位置就没有问题了，无论缩放还是滚动，在你想要的位置添加一条线也没有问题。
var width = 960,
height = 800;
var i = 0,
duration = 750,
rectW = 100,
rectH = 30;
var tree = d3.layout.tree().nodeSize([220, 40]);
var diagonal = d3.svg.diagonal()
.projection(function(d) {
return [d.x + rectW / 2, d.y + rectH / 2];
});
var svg = d3.select("#body").append("svg").attr("width", 1000).attr("height", 1000).style("border", "1px solid red")
.call(zm = d3.behavior.zoom().scaleExtent([0.3, 3]).on("zoom", redraw)).append("g").attr("id", "g_main")
.attr("transform", "translate(" + 350 + "," + 20 + ")");
//necessary so that zoom knows where to zoom and unzoom from
zm.translate([350, 20]);
var root = {
"name": "node6",
"children": [{
"name": "node5",
"respuesta": "SI",
"children": [{
"name": "node4",
"children": [{
"name": "node3"
}]
}]
}, {
"name": "node2",
"respuesta": "NO"
},
{
"name": "node1",
"respuesta": "SI"
}
]
}
root.x0 = 0;
root.y0 = height / 2;
root.children.forEach(collapse);
update(root);
root.x0 = 0;
root.y0 = height / 2;
setTimeout(() => {
let source = d3.select("#node4").datum();
let target = d3.select("#node6").datum();
d3.select("#g_main").append("line")
.style("stroke", "black") // colour the line
.attr("x1", source.x0 + rectW / 2) // x position of the first end of the line
.attr("y1", source.y0) // y position of the first end of the line
.attr("x2", target.x0 + rectW / 2) // x position of the second end of the line
.attr("y2", target.y0 + rectH); // y position of the second end of the line
}, 1000)
function collapse(d) {
if (d.children) {
d._children = d.children;
d._children.forEach(collapse);
// d.children = null;
}
}
root.children.forEach(collapse);
update(root);
d3.select("#body").style("height", "800px");
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;
});
// Update the nodes…
var node = svg.selectAll("g.node")
.data(nodes, function(d) {
return d.id || (d.id = ++i);
});
// Enter any new nodes at the parent's previous position.
var nodeEnter = node.enter().append("g")
.attr("class", "node")
.attr("transform", function(d) {
return "translate(" + source.x0 + "," + source.y0 + ")";
})
nodeEnter.append("rect")
.attr("id", function(d) {
return "node" + d.id
})
.attr("width", rectW)
.attr("height", rectH)
.attr("stroke", "white")
.attr("stroke-width", 1)
.style("fill", function(d) {
return d._children ? "lightsteelblue" : "#fff";
});
nodeEnter.append("image").attr("href", "plus-flat.png").attr("width", (d) => {
let length = 0;
if (d.children) {
length = d.children.length;
} else {
length = 0;
}
if (d.name == "INICIO" && length == 0) {
return 0;
} else if (d.name == "INICIO" && length != 0) {
return 0;
} else {
return 25;
}
}).style("transform", "translate(65px, -10px)")
nodeEnter.append("text")
.attr("x", rectW / 2)
.attr("y", rectH / 2)
.attr("dy", ".35em")
.text(function(d) {
return d.name;
})
// Transition nodes to their new position.
var nodeUpdate = node.transition()
.duration(duration)
.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
});
nodeUpdate.select("rect")
.attr("width", rectW)
.attr("height", rectH)
.attr("stroke", "black")
.attr("stroke-width", 1)
.style("fill", function(d) {
return d._children ? "lightsteelblue" : "#fff";
});
nodeUpdate.select("text")
.style("fill-opacity", 1);
// Transition exiting nodes to the parent's new position.
var nodeExit = node.exit().transition()
.duration(duration)
.attr("transform", function(d) {
return "translate(" + source.x + "," + source.y + ")";
})
.remove();
nodeExit.select("rect")
.attr("width", rectW)
.attr("height", rectH)
//.attr("width", bbox.getBBox().width)""
//.attr("height", bbox.getBBox().height)
.attr("stroke", "black")
.attr("stroke-width", 1);
nodeExit.select("text");
// Update the links…
var link = svg.selectAll("path.link")
.data(links, function(d) {
return d.target.id;
});
// Enter any new links at the parent's previous position.
link.enter().insert("path", "g")
.attr("class", "link")
.style("stroke", (d) => {
let respuesta = d.target.respuesta;
if (respuesta == "SI") {
return "#2a8841";
} else if (respuesta == "NO") {
return "#d44646";
} else {
return "#b7b7b7";
}
})
.attr("x", rectW / 2)
.attr("y", rectH / 2)
.attr("d", function(d) {
var o = {
x: source.x0,
y: source.y0
};
return diagonal({
source: o,
target: o
});
});
// Transition links to their new position.
link.transition()
.duration(duration)
.attr("d", diagonal);
// Transition exiting nodes to the parent's new position.
link.exit().transition()
.duration(duration)
.attr("d", function(d) {
var o = {
x: source.x,
y: source.y
};
return diagonal({
source: o,
target: o
});
})
.remove();
link.append("text").text("otros")
// Stash the old positions for transition.
nodes.forEach(function(d) {
d.x0 = d.x;
d.y0 = d.y;
});
}
// Toggle children on click.
function click(d) {
if (d.children) {
d._children = d.children;
d.children = null;
} else {
d.children = d._children;
d._children = null;
}
update(d);
}
//Redraw for zoom
function redraw() {
//console.log("here", d3.event.translate, d3.event.scale);
svg.attr("transform",
"translate(" + d3.event.translate + ")" +
" scale(" + d3.event.scale + ")");
}.node {
cursor: pointer;
}
.node circle {
fill: #fff;
stroke: steelblue;
stroke-width: 1.5px;
}
.node text {
font: 10px sans-serif;
}
.link {
fill: none;
stroke: #ccc;
stroke-width: 1.5px;
}
body {
overflow: hidden;
}<script src="https://d3js.org/d3.v3.js"></script>
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