titel=html`<h1>智能科学与技术---课程体系拓扑关系图</h1>`
viewof direction = Inputs.radio(["前继", "后继"], {value: "后继", label: "选择方向"})
direction
svg = {
const svg = d3.select(DOM.svg(width, height));
const defs = svg.append("defs");
// Add a g.view for holding the sankey diagram.
const view = svg.append("g")
.classed("view", true)
.attr("transform", `translate(${margin}, ${margin})`);
// Define the nodes.
const nodes = view.selectAll("rect.node")
.data(graph.nodes)
.join("rect")
.classed("node", true)
.attr("id", d => `node-${d.index}`)
.attr("x", d => d.x0)
.attr("y", d => d.y0)
.attr("width", d => d.x1 - d.x0)
.attr("height", d => Math.max(1, d.y1 - d.y0))
.attr("fill", d => d.color)
.attr("opacity", 0.8);
// Add definitions for all of the linear gradients.
//为所有线性渐变添加定义
const gradients = defs.selectAll("linearGradient")
.data(graph.links)
.join("linearGradient")
.attr("id", d => d.gradient.id)
gradients.append("stop").attr("offset", 0.0).attr("stop-color", d => d.source.color);
gradients.append("stop").attr("offset", 1.0).attr("stop-color", d => d.target.color);
// Add titles for node hover effects.鼠标滑过节点，显示的悬浮文字
nodes.append("title").text(d => `${d.name}\n${format(d.value)}`);
// Define the gray links灰色的连接.
const links = view.selectAll("path.link")
.data(graph.links)
.join("path")
.classed("link", true)
.attr("d", mysankey.sankeyLinkHorizontal())
.attr("stroke", "grey")
.attr("stroke-opacity", 0.2)
.attr("stroke-width", d => Math.max(1, d.width))
.attr("fill", "none");
// Add <title> hover effect on links.
links.append("title").text(d => `${d.source.name} ${arrow} ${d.target.name}\n${format(d.value)}`);
// Define the default dash behavior for colored gradients.
//一条关系之间的颜色流动代码就在这里
function setDash(link) {
let el = view.select(`#${link.path.id}`);
let length = el.node().getTotalLength();
if(direction=="前继"){
el.attr("stroke-dasharray", `${length} ${length}`)
.attr("stroke-dashoffset", -length);
}else{
el.attr("stroke-dasharray", `${length} ${length}`)
.attr("stroke-dashoffset", length);
}
}
const gradientLinks = view.selectAll("path.gradient-link")
.data(graph.links)
.join("path")
.classed("gradient-link", true)
.attr("id", d => d.path.id)
.attr("d", mysankey.sankeyLinkHorizontal())
.attr("stroke", d => d.gradient)
.attr("stroke-opacity", 0.5)
.attr("stroke-width", d => Math.max(1, d.width))
.attr("fill", "none")
.each(setDash);
// Add text labels.这个是一直显示的节点旁边的文字
view.selectAll("text.node")
.data(graph.nodes)
.join("text")
.classed("node", true)
.attr("x", d => d.x1)
.attr("dx", 6)
.attr("y", d => (d.y1 + d.y0) / 2)
.attr("dy", "0.35em")
.attr("fill", "black")
.attr("opacity", 0.7)
.attr("text-anchor", "start")
.attr("font-size", 14)
.attr("font-family", "Arial, sans-serif")
.text(d => d.name)
.filter(d => d.x1 > width / 2)
.attr("x", d => d.x0)
.attr("dx", -6)
.attr("text-anchor", "end");
//鼠标移到-开始流动
function branchAnimate(node) {
let mytextnodes = view.selectAll("text.node")
.filter((mytextnode) => {
return node.name == mytextnode.name;
});
mytextnodes.attr("font-size",14)
.transition()
.attr("fill", "black")
.attr("opacity", 0.7);
let mynodes = view.selectAll("rect.node")
.filter((mynode) => {
return node.name == mynode.name;
});
mynodes.attr("opacity", 0.8);
if(direction=="前继"){
let links = view.selectAll("path.gradient-link")
.filter((link) => {
return node.targetLinks.indexOf(link) !== -1; //在node.targetLinks中寻找到这个link是第几个，不是最后一个就行
});
let nextNodes = [];
links.each((link) => {
nextNodes.push(link.source);
});
links.attr("stroke-opacity", 0.5)
.transition()
.duration(duration)
.ease(d3.easeLinear)
.attr("stroke-dashoffset", 0)
.on("end", () => {
nextNodes.forEach((node) => {
branchAnimate(node);
});
});
}else{
let links = view.selectAll("path.gradient-link")
.filter((link) => {
return node.sourceLinks.indexOf(link) !== -1;
});
let nextNodes = [];
links.each((link) => {
nextNodes.push(link.target);
});
links.attr("stroke-opacity", 0.5)
.transition()
.duration(duration)
.ease(d3.easeLinear)
.attr("stroke-dashoffset", 0)
.on("end", () => {
nextNodes.forEach((node) => {
branchAnimate(node);
});
});
}
}
function ohternodes_opactiy(node) {
let allnodetexts = view.selectAll("text.node")
allnodetexts.attr("font-size",14)
.transition()
.attr("fill", "black")
.attr("opacity", 0.1);
let alllinks = view.selectAll("path.link")
alllinks.attr("stroke", "grey")
.attr("stroke-opacity", 0.1);
let allnodes = view.selectAll("rect.node")
allnodes.attr("opacity", 0.1);
branchAnimate(node);
}
//鼠标移开-流动消失
function branchClear() {
gradientLinks.transition();
gradientLinks.attr("stroke-opactiy", 0.5)
.each(setDash);
let mytextnodes = view.selectAll("text.node");
mytextnodes.attr("font-size",14)
.transition()
.attr("fill", "black")
.attr("opacity", 0.7);
let alllinks = view.selectAll("path.link")
alllinks.attr("stroke", "grey")
.attr("stroke-opacity", 0.2);
let mynodes = view.selectAll("rect.node")
mynodes.attr("opacity", 0.8);
}
nodes.on("mouseover", ohternodes_opactiy)
.on("mouseout", branchClear);
return svg.node();
}
fav = html`<p>My favorite color is <span style="font-weight:bold;color:${color1}">${color1}</span></p>`
color1="blue"
Type JavaScript, then Shift-Enter. Ctrl-space for more options. Arrow ↑/↓ to switch modes.
layout = mysankey.sankey()
.size(size)
.nodePadding(nodePadding)
.nodeWidth(nodeWidth)
format = (value) => {
let f = d3.format(",.0f");
return f(value) + " TWh";
}
color = (value) => {
return d3.interpolateRainbow(value);
}
Type JavaScript, then Shift-Enter. Ctrl-space for more options. Arrow ↑/↓ to switch modes.
Type JavaScript, then Shift-Enter. Ctrl-space for more options. Arrow ↑/↓ to switch modes.
size = [width - 2 * margin, height - 2 * margin]
height = 600
margin = 10
nodeWidth = 20
nodePadding = 10
duration = 250
arrow = "\u2192"
d3 = require("d3@5.9")
mysankey=require('d3-sankey-forxpos@1.2.5/dist/d3-sankey-forxpos.min.js')
Type JavaScript, then Shift-Enter. Ctrl-space for more options. Arrow ↑/↓ to switch modes.
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