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javascript - 重置 d3 forceSimulation 中的所有隔离力

转载 作者:行者123 更新时间:2023-11-30 14:43:53 24 4
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我正在尝试创建一个在几个状态之间转换的群图,但遇到了一些障碍。我发现设置它的最佳方法是将我的节点聚集在中心,然后 isolate forceX and forceY根据我的数据。然而,我发现一旦我这样做了,就不可能“重置”整个群体并将每个节点带回中心。即使我添加 forceCenters,似乎每个节点都开始相对于最后一个孤立的力移动。

诚然,我是 d3-force 的新手,所以这可能是一个愚蠢的问题,但我已经做了很多搜索但没有答案。

var width = 400;
var height = 150;
var radius = 3;
var data = [
{"id":1, "a":1, "b":1, "color":"#ff0000"},
{"id":2, "a":1, "b":2, "color":"#ff0000"},
{"id":3, "a":2, "b":1, "color":"#00ff00"},
{"id":4, "a":2, "b":2, "color":"#00ff00"},
{"id":5, "a":3, "b":1, "color":"#0000ff"},
{"id":6, "a":3, "b":2, "color":"#0000ff"},
];


$(document).ready(function(){
createGraph();
makeForce();
});

var svg;

function createGraph(){
svg = d3.select("body")
.append("svg")
.attr("width", width)
.attr("height", height)
.style("background-color", "#dddddd");
}

var simulation;

function makeForce(){


var nodes=data;

node = svg.append("g").attr("stroke", "#bbb").attr("stroke-width", .5).selectAll(".node");

var attractForce = d3.forceManyBody().strength(20).distanceMax(40).distanceMin(60);
var repelForce = d3.forceManyBody().strength(-10).distanceMax(50).distanceMin(10);

simulation = d3.forceSimulation(nodes)
.alphaDecay(0.03)
// .force("attractForce",attractForce)
.force("repelForce",repelForce)
.force("x", d3.forceX(width/2))
.force("y", d3.forceY(height/2))
.force('collision', d3.forceCollide().radius(function(d) {
return (radius+2);
}))
// .alphaTarget(.1)
.on("tick", ticked);

restart(0);

function restart(split){
if(split==0){

node = node.data(nodes, function(d) { return d.id;});

node.exit().remove();
node = node.enter().append("circle").attr("fill", function(d) { return d.color; }).attr("r", radius).merge(node);

simulation.nodes(nodes);

simulation.alpha(1).restart();
}else if(split==1){
d3.select("#comments").html("Dots split");
node = node.data(nodes, function(d) { return d.id;});

node.exit().remove();

node = node.enter().append("circle").attr("fill", function(d) { return d.color; }).attr("r", radius).merge(node);


// Update and restart the simulation.
simulation.nodes(nodes);
simulation.force("y", d3.forceY(height/2))
.force("A", isolate(d3.forceX(width), function(d) {
return (d.b == 2);
}))
.force("B", isolate(d3.forceX(0), function(d) {
return (d.b == 1);
}))
.on("tick", ticked);


// simulation.alpha(1).restart();
}else if(split==2){

d3.select("svg").style("background-color", "#ffffdd");
d3.select("#comments").html("Nothing happens here, but I'd like to clear out all the forces on the dots and have them return to the center");

node = node.data(nodes, function(d) { return d.id;});

node.exit().remove();

node = node.enter().append("circle").attr("fill", function(d) { return d.color; }).attr("r", radius).merge(node);

// Update and restart the simulation.
simulation.nodes(nodes);
simulation.force("x", d3.forceX(width/2))
.force("y", d3.forceY(width/2))
.on("tick", ticked);


// simulation.alpha(1).restart();
}



function isolate(force, filter) {
var initialize = force.initialize;
force.initialize = function() { initialize.call(force, nodes.filter(filter)); };
return force;
}


}

setTimeout(function(){
restart(1);
}, 1000);

setTimeout(function(){
restart(2);
}, 4000);

function ticked() {
node.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
}

}
<head>
<script src="https://d3js.org/d3.v4.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
</head>
<body>
<p id="comments">Dots load</p>
</body>

作为次要问题,如果有人能向我解释为什么 forceX() 设置为 0 并且宽度不会将点带到边缘,那也很有用。我想这源于我对上述内容的误解。

最佳答案

请记住,在模拟中注册的力将保持附加状态,直到您通过将它们设置为 null 将其移除:

# simulation.force(name[, force])

[…]

To remove the force with the given name, pass null as the force.

只要名称不同,仅添加新势力不会影响任何先前添加的势力。要操纵已经附加到模拟的力,您需要使用相同的名称重新注册该力/它的克隆/新力。类似地,要取消注册您将其设置为 null 的强制。

要移除隔离力 "A""B",您需要执行以下操作:

simulation
.force("A", null)
.force("B", null);

这也回答了你的第二个问题,为什么使用值为 0widthd3.forceX 不会将圆定位在边界上.所有先前注册的力,即 "repelForce""x""y""collision",在添加新的隔离力 "A""B" 时仍将应用。正是这六种力的结合决定了第二步中圆圈的位置。

看看下面的工作演示:

var width = 400;
var height = 150;
var radius = 3;
var data = [
{"id":1, "a":1, "b":1, "color":"#ff0000"},
{"id":2, "a":1, "b":2, "color":"#ff0000"},
{"id":3, "a":2, "b":1, "color":"#00ff00"},
{"id":4, "a":2, "b":2, "color":"#00ff00"},
{"id":5, "a":3, "b":1, "color":"#0000ff"},
{"id":6, "a":3, "b":2, "color":"#0000ff"},
];


$(document).ready(function(){
createGraph();
makeForce();
});

var svg;

function createGraph(){
svg = d3.select("body")
.append("svg")
.attr("width", width)
.attr("height", height)
.style("background-color", "#dddddd");
}

var simulation;

function makeForce(){


var nodes=data;

node = svg.append("g").attr("stroke", "#bbb").attr("stroke-width", .5).selectAll(".node");

var attractForce = d3.forceManyBody().strength(20).distanceMax(40).distanceMin(60);
var repelForce = d3.forceManyBody().strength(-10).distanceMax(50).distanceMin(10);

simulation = d3.forceSimulation(nodes)
.alphaDecay(0.03)
// .force("attractForce",attractForce)
.force("repelForce",repelForce)
.force("x", d3.forceX(width/2))
.force("y", d3.forceY(height/2))
.force('collision', d3.forceCollide().radius(function(d) {
return (radius+2);
}))
// .alphaTarget(.1)
.on("tick", ticked);

restart(0);

function restart(split){
if(split==0){

node = node.data(nodes, function(d) { return d.id;});

node.exit().remove();
node = node.enter().append("circle").attr("fill", function(d) { return d.color; }).attr("r", radius).merge(node);

simulation.nodes(nodes);

simulation.alpha(1).restart();
}else if(split==1){
d3.select("#comments").html("Dots split");
node = node.data(nodes, function(d) { return d.id;});

node.exit().remove();

node = node.enter().append("circle").attr("fill", function(d) { return d.color; }).attr("r", radius).merge(node);


// Update and restart the simulation.
simulation.nodes(nodes);
simulation.force("y", d3.forceY(height/2))
.force("A", isolate(d3.forceX(width), function(d) {
return (d.b == 2);
}))
.force("B", isolate(d3.forceX(0), function(d) {
return (d.b == 1);
}))
.on("tick", ticked);


// simulation.alpha(1).restart();
}else if(split==2){

d3.select("svg").style("background-color", "#ffffdd");
d3.select("#comments").html("Nothing happens here, but I'd like to clear out all the forces on the dots and have them return to the center");

node = node.data(nodes, function(d) { return d.id;});

node.exit().remove();

node = node.enter().append("circle").attr("fill", function(d) { return d.color; }).attr("r", radius).merge(node);

// Update and restart the simulation.
simulation.nodes(nodes);
simulation.force("x", d3.forceX(width/2))
.force("y", d3.forceY(height/2))
.force("A", null)
.force("B", null)
.on("tick", ticked);


simulation.alpha(1).restart();
}



function isolate(force, filter) {
var initialize = force.initialize;
force.initialize = function() { initialize.call(force, nodes.filter(filter)); };
return force;
}


}

setTimeout(function(){
restart(1);
}, 1000);

setTimeout(function(){
restart(2);
}, 4000);

function ticked() {
node.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
}

}
<head>
<script src="https://d3js.org/d3.v4.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
</head>
<body>
<p id="comments">Dots load</p>
</body>

关于javascript - 重置 d3 forceSimulation 中的所有隔离力,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/49248627/

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