G8 · 雨幕双面积图
双序列因果（投入 vs 产出）的 Glance 真实参考实现。示例结论为“营销投入落下，注册量流动”，副标题已经把图例、单位或时间口径写在图旁：每日广告投入自上而下，单位千美元 · 注册量形成下方流线，单位百人 · 共 30 天
技术档案
| 项目 | 约定 |
|---|---|
| 数据形状 | 双序列因果（投入 vs 产出） |
| 场合 | 增长复盘 |
| 读者时间 | ~30s |
| 渲染引擎 | ECharts |
| 交互与动效 | 滚入视野初始化，点击图表重播；保留原 gallery 的 tooltip 与动画 |
| 示例来源行 | DUAL AREA · MONO-FANCY · GROWTH + ADS |
实现与使用边界
- 页面直接复用 gallery 中 “Campaigns rain down” 的卡片结构和同名渲染块，没有按截图重新绘制。
- 标题、副标题、图形、来源行四件套保持原样；数据编码、比例关系、灰阶和动画节奏由原实现决定。
- 使用时只替换数据与文案，并保持“双序列因果（投入 vs 产出）”这一数据契约；若数据本体改变，应回到总目录重新选型。
- 颜色限于 Mono 灰阶，面积编码继续使用平方根换算；柱长、位置与角度编码不得断轴或视觉夸大。
模板来源：Lieflat Charts
G8 Rainfall Dual Area，真实骨架取自templates/glance-gallery.html的 “Campaigns rain down” 卡片与对应渲染块。
g8-rainfall-dual-area.html —— 自包含单页源码
<!doctype html>
<html lang="zh-CN">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1" />
<title>Lieflat Charts — G8 雨幕双面积图</title>
<script src="https://cdn.jsdelivr.net/npm/chart.js@4"></script>
<script src="https://cdn.jsdelivr.net/npm/echarts@6/dist/echarts.min.js"></script>
<link rel="stylesheet" href="../../../../vendor/fonts/fonts.css">
<style>
:root{--bg:#F0EFEB;--dark:#1C1C1A;--ink:#1C1C1A;--muted:#8F8E88;--faint:#C6C5BF;--grid:#DEDDD6}
*{margin:0;padding:0;box-sizing:border-box}
body{background:var(--bg);font-family:'Inter',sans-serif;color:var(--ink);padding:40px;-webkit-font-smoothing:antialiased}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:22px;max-width:1400px;margin:0 auto}
.card{background:var(--bg);border-radius:24px;padding:28px 28px 20px}
.card.dark{background:var(--dark);color:#F0EFEB}
.card.dark .sub{color:#8F8E88}
.card.dark .src{color:#55554F}
h2{font-weight:700;font-size:16.5px;letter-spacing:-.02em;margin-bottom:3px}
.sub{font-size:11.5px;color:var(--muted);margin-bottom:14px}
.src{font-size:9.5px;color:var(--faint);margin-top:10px;letter-spacing:.08em;font-weight:500}
.ch{height:320px}
.wrap{position:relative;height:320px}
svg text{font-family:'Inter',sans-serif}
.pop{transform-box:fill-box;transform-origin:center;animation:pop .5s cubic-bezier(.2,.7,.3,1.3) both}
@keyframes pop{from{transform:scale(0)}to{transform:none}}
.pagehead{max-width:1400px;margin:0 auto 26px;padding:0 4px}
.pagehead h1{font-size:22px;letter-spacing:-.02em;font-weight:800}
.pagehead p{font-size:12px;color:#8F8E88;margin-top:5px;line-height:1.7}
.pagehead .badge{margin:0 2px}
.badge{display:inline-block;font-size:9px;font-weight:700;letter-spacing:.08em;
padding:3px 10px;border-radius:99px;margin-bottom:10px}
.badge.del{background:#1C1C1A;color:#F0EFEB}
.badge.pick{border:1.5px solid #1C1C1A;color:#1C1C1A}
.badge.pair{border:1px dashed #B0AFA9;color:#8F8E88}
.card.dark .badge.del{background:#F0EFEB;color:#1C1C1A}
.card.dark .badge.pick{border-color:#F0EFEB;color:#F0EFEB}
.card.dark .badge.pair{border-color:#55554F;color:#8F8E88}
html,body{min-height:100%;margin:0}
body{display:grid;place-items:center;padding:28px}
.pagehead{display:none}
.grid2{display:block;width:min(100%,920px);max-width:920px;margin:0 auto}
.card,.card.wide{display:block;width:100%;min-height:520px;padding:38px 42px 24px}
.card .split{grid-template-columns:minmax(190px,250px) 1fr}
.wiki-code{display:inline-block;margin-bottom:12px;padding:4px 11px;border:1px dashed #B0AFA9;border-radius:99px;color:#8F8E88;font-size:10px;font-weight:700;letter-spacing:.08em}
.card.dark .wiki-code{border-color:#55554F}
@media(max-width:620px){
body{padding:10px}
.card,.card.wide{min-height:500px;padding:26px 18px 20px}
.card .split{display:block}
.card .note,.card .legend{display:none}
}
</style>
</head>
<body>
<main class="grid2">
<div class="card">
<span class="wiki-code">GLANCE 快读型 · G8</span>
<h2>营销投入落下，注册量流动</h2>
<div class="sub">每日广告投入自上而下，单位千美元 · 注册量形成下方流线，单位百人 · 共 30 天</div>
<div class="ch" id="rainfall"></div>
<div class="src">DUAL AREA · MONO-FANCY · GROWTH + ADS</div>
</div>
</main>
<script>
// ── shared Mono tokens ──
const INK='#1C1C1A',PAPER='#F0EFEB',MUTED='#8F8E88',GRID='#DEDDD6';
const L=['#1C1C1A','#4A4944','#6A6963','#8F8E88','#B0AFA9','#C6C5BF'];
const LAD=['#1C1C1A','#4A4944','#8F8E88','#B0AFA9','#D8D7D1'];
const tipLight={backgroundColor:INK,borderWidth:0,textStyle:{color:PAPER,fontFamily:'Inter',fontSize:12},padding:[10,14]};
const tipDark={backgroundColor:PAPER,borderWidth:0,textStyle:{color:INK,fontFamily:'Inter',fontSize:12},padding:[10,14]};
const rnd=(i,k)=>((i*73856093)^(k*19349663))%1000/1000; // deterministic
// ── unified reveal: every chart waits to be scrolled into view; click replays.
// fn charts manage their own timers via keep(); they're cleared on replay.
const timers={};
const obsReveal=(id,fn)=>{
const el=document.getElementById(id);
const go=()=>{(timers[id]||[]).forEach(clearInterval);timers[id]=[];fn(el)};
const io=new IntersectionObserver(es=>{
if(es[0].isIntersecting){go();io.disconnect()}
},{threshold:.35});
io.observe(el);
el.style.cursor='pointer';
el.addEventListener('click',go);
};
const keep=(id,t)=>{(timers[id]=timers[id]||[]).push(t)};
const eReveal=(id,opt)=>obsReveal(id,el=>{
const g=echarts.getInstanceByDom(el)||echarts.init(el);
g.clear();g.setOption(opt);
});
const cjs={};
const cReveal=(id,mkCfg)=>obsReveal(id,el=>{
cjs[id]?.destroy();
cjs[id]=new Chart(el,mkCfg());
});
Chart.defaults.color=MUTED;
Chart.defaults.font.family='Inter';
Chart.defaults.font.size=10.5;
Chart.defaults.borderColor=GRID;
Chart.defaults.plugins.legend.display=false;
Chart.defaults.plugins.tooltip.backgroundColor=INK;
Chart.defaults.plugins.tooltip.titleColor='#F0EFEB';
Chart.defaults.plugins.tooltip.bodyColor='#A5A49E';
Chart.defaults.plugins.tooltip.padding=12;
Chart.defaults.plugins.tooltip.cornerRadius=12;
Chart.defaults.plugins.tooltip.displayColors=false;
// ════ mono-fancy · 4: rainfall dual area ════
(()=>{
const days=Array.from({length:30},(_,i)=>i+1);
const flow=[42,45,44,48,52,55,53,58,64,62,66,71,69,75,82,79,84,80,86,92,88,95,91,97,104,101,108,105,112,118];
const rain=[2,0,4,8,3,0,6,12,7,3,9,15,6,2,11,5,8,14,4,9,6,13,3,7,10,5,12,8,15,6];
eReveal('rainfall',{
animationDuration:1200,animationEasing:'quarticOut',
tooltip:{...tipLight,trigger:'axis',
formatter:p=>`Day ${p[0].axisValue} — spend $${rain[p[0].dataIndex]}K · ${p[0].value} sign-ups`},
axisPointer:{link:[{xAxisIndex:'all'}],lineStyle:{color:'#B0AFA9'}},
grid:[
{left:44,right:14,top:8,height:'26%'},
{left:44,right:14,top:'42%',bottom:26},
],
xAxis:[
{gridIndex:0,type:'category',data:days,axisLine:{show:false},axisTick:{show:false},axisLabel:{show:false},position:'bottom'},
{gridIndex:1,type:'category',data:days,axisLine:{show:false},axisTick:{show:false},
axisLabel:{color:MUTED,fontFamily:'Inter',fontSize:9.5,interval:6,formatter:v=>'D'+v}},
],
yAxis:[
{gridIndex:0,inverse:true,max:18,splitLine:{show:false},
axisLabel:{color:'#B0AFA9',fontFamily:'Inter',fontSize:9,formatter:'${value}K'},
axisLine:{show:false},axisTick:{show:false}},
{gridIndex:1,splitLine:{lineStyle:{color:'#DEDDD6'}},
axisLabel:{color:MUTED,fontFamily:'Inter',fontSize:9.5},
axisLine:{show:false},axisTick:{show:false}},
],
series:[
{name:'spend',type:'bar',xAxisIndex:0,yAxisIndex:0,data:rain,
itemStyle:{color:'#B0AFA9',borderRadius:[0,0,4,4]},barWidth:'55%'},
{name:'sign-ups',type:'line',xAxisIndex:1,yAxisIndex:1,data:flow,
smooth:.4,symbol:'none',lineStyle:{color:INK,width:2.2},
areaStyle:{color:{type:'linear',x:0,y:0,x2:0,y2:1,
colorStops:[{offset:0,color:'rgba(28,28,26,.22)'},{offset:1,color:'rgba(28,28,26,0)'}]}}},
],
});
})();
</script>
</body>
</html>