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文字是传达信息最传统的方式,Text 标记具备有大量的视觉映射通道:x,y,color,fontSize,rotate 等,除此之外,还有大量的文本样式相关的配置,可以通过可视化映射的方式,让文本可视化具备有更强的表达性。一般用于几个场景:

  • 文本可视化
  • 数据的标注和辅助

开始使用

绘制一个简单的柱形图,然后使用 Text 标记去绘制数据标签,辅助看数。

link
/**
* A recreation of this demo: https://observablehq.com/@d3/bar-chart
*/
// single
{
annotations: [
{
type: "text",
data: ["N", 0.08],
encode: { text: "frequency" },
style: { fill: "black", textAlign: "center", dy: -5 },
}
]
}
// multi
{
annotations: [
{
type: "text",
// Position mapping
xField: '',
yField: '',
// content mapping
text: '',
style: { fill: "black", textAlign: "center", dy: -5 },
}
]
}

更多的案例,可以查看图表示例页面。

选项

目前 area 有以下几个内置的 shape 图形,默认为 text。

图形描述示例
text绘制文本
badge绘制带有标记的文本,形如一个气球

text

属性描述类型默认值
fontSize文字大小number | Function<number>-
fontFamily文字字体string | Function<string>-
fontWeight字体粗细number | Function<number>-
lineHeight文字的行高number | Function<number>-
textAlign设置文本内容的当前对齐方式, 支持的属性:center | end | left | right | start,默认值为startstring | Function<string>-
textBaseline设置在绘制文本时使用的当前文本基线, 支持的属性:top | middle | bottom | alphabetic | hanging。默认值为bottomstring | Function<string>-
fill图形的填充色string | Function<string>-
fillOpacity图形的填充透明度number | Function<number>-
stroke图形的描边string | Function<string>-
strokeOpacity描边透明度number | Function<number>-
lineWidth图形描边的宽度number | Function<number>-
lineDash描边的虚线配置,第一个值为虚线每个分段的长度,第二个值为分段间隔的距离。lineDash 设为[0, 0]的效果为没有描边。[number,number] | Function<[number, number]>-
opacity图形的整体透明度number | Function<number>-
shadowColor图形阴影颜色string | Function<string>-
shadowBlur图形阴影的高斯模糊系数number | Function<number>-
shadowOffsetX设置阴影距图形的水平距离number | Function<number>-
shadowOffsetY设置阴影距图形的垂直距离number | Function<number>-
cursor鼠标样式。同 css 的鼠标样式,默认 'default'。string | Function<string>'default'

badge

除了 text 的配置之外,还有以下配置。

属性描述类型默认值
markerSize标记大小number24
markerFill标记填充色string
markerFillOpacity标记填充色透明度number
markerStroke标记描边色string
markerStrokeOpacity标记描边色 透明度number

FAQ

  • 怎么指定箭头图标的长度?

有两种指定箭头图标长度的方式,一种是通过填写像素值,比如 40,来指定为固定长度;另外一种是通过指定一个百分比,比如 30%,来指定参考箭头长度的相对长度。默认值为 40%。如下示例:

chart
.vector()
// ...
.shape('vector')
.style({
arrowSize: 40,
// arrowSize: '30%',
});