地图
流向图
type: 'flowmap'在两个地理端点之间绘制带方向、渐细的曲线带。端点可以是 [lon, lat] 坐标对，或同一图表中 mappoint 系列里某个点的 id；带宽随每条连线的 weight 缩放，箭头指向目的地。
编辑右侧的JSON并按Run（或⌘/Ctrl + Enter）——数据、标题、类别和颜色全部实时更新。
实时
流向图
编辑 · JSON
数据格式
{ from, to, weight } · [from, to, weight] (from/to: 点 id 或 [lon,lat])
数据结构
传入图表的 JSON——可直接放进你的 series。
data: [
['London', 'New York', 8],
['Tokyo', 'Sydney', 5],
['São Paulo', 'London', 4]
]示例
import KatuCharts from 'katucharts.js';
KatuCharts.chart('container', {
chart: { type: 'map' },
chart: { type: 'map', map: world },
series: [
{ type: 'map', mapData: world, data: [] },
{ type: 'mappoint', data: [
{ id: 'London', lat: 51.5, lon: -0.12 },
{ id: 'New York', lat: 40.71, lon: -74 }
] },
{
type: 'flowmap', width: 14,
data: [
['London', 'New York', 8],
['Tokyo', 'Sydney', 5]
]
}
]
});类型特定选项
| 选项 | 描述 |
|---|---|
from / to | 端点：mappoint 的 id 或 [lon, lat] 坐标对。 |
weight | 连线的相对大小 → 带宽。 |
width | 带的最大宽度（像素）。 |
curveFactor | 曲线的侧向弯曲（默认 0.3）。 |
fillOpacity | 带填充的不透明度。 |
Common errors
- Why does my 流向图 chart render as a line chart?
- The chart type was not registered. KatuCharts logs "KatuCharts: unknown series type "<type>", falling back to line" and draws a line chart rather than throwing. Import the module the type belongs to — for example `import 'katucharts.js/bio';` — before creating the chart.
- Why do I get "Cannot read properties of null (reading 'appendChild')"?
- The container element does not exist when the chart is created. Create the chart after the element is in the DOM: in React that means inside useEffect, not during render.
- Why is the chart rendering with zero height?
- The container has no height. A div with no content collapses to zero. Give it a height in CSS, or pass `chart: { height: 400 }` in the options.
FAQ
- How do I create a 流向图 chart in JavaScript?
- Install with `npm install katucharts.js`, then call KatuCharts.chart(container, { chart: { type: 'flowmap' }, series: [...] }).
- Why does my 流向图 chart render as a line chart?
- The chart type was not registered. KatuCharts logs "KatuCharts: unknown series type "<type>", falling back to line" and draws a line chart rather than throwing. Import the module the type belongs to — for example `import 'katucharts.js/bio';` — before creating the chart.
- Why do I get "Cannot read properties of null (reading 'appendChild')"?
- The container element does not exist when the chart is created. Create the chart after the element is in the DOM: in React that means inside useEffect, not during render.
- Why is the chart rendering with zero height?
- The container has no height. A div with no content collapses to zero. Give it a height in CSS, or pass `chart: { height: 400 }` in the options.