plotly / plotly/plotly.js

add native range charts

未关闭
#7,288 2 条评论 2 个 reaction 已指派 0 人 在 GitHub 查看

还没有人认领这个 Issue。

feature P3
主要语言
JavaScript
星标
18.3k
派生
2k
平均合并
2 天 12 小时
30 天内合并 PR
28

描述

MinutePhysics called us out (by name!) for not having native support for range charts: https://www.youtube.com/watch?v=5zBg9pH_6bE

However, to be clear, it is possible to build this chart type in Plotly using the base attribute for bar charts and doing a bit of data preparation.

Here's a live demo of a custom range chart and our built-ins: https://codepen.io/ndrezn/pen/XJrWboB

Code snippet
/**
 * Creates a range bar chart using Plotly.js.
 *
 * @param {Object} data - The dataset, with keys as categories (e.g., cities) and values as arrays of measurements.
 * @param {Array} labels - The labels for each measurement (e.g., temperature metrics).
 * @param {string} containerId - The ID of the HTML container to render the chart.
 * @param {string} title - The title of the chart.
 */
function rangeChart(data, labels, containerId, title) {
  const categories = Object.keys(data); // Extract categories (e.g., cities)

  // Generate bar traces for each label
  const barTraces = labels.map((label, index) => {
    const bases = categories.map((category) =>
      index === 0 ? data[category][index] : data[category][index - 1]
    ); // base, i.e. the previous value
    const heights = categories.map(
      (category) => data[category][index] - bases[categories.indexOf(category)]
    ); // Height relative to the base, i.e. the current value
    return {
      x: categories,
      y: heights, // Bar heights
      base: bases, // Starting points for each bar
      name: label,
      type: "bar"
    };
  });

  // Layout for the chart
  const layout = {
    title: title,
    barmode: "overlay", // Overlapping bars to show ranges
    xaxis: { title: "Category" },
    yaxis: { title: "Value" }
  };

  // Render the chart
  Plotly.newPlot(containerId, barTraces, layout);
}

const ranges = {
  Ontario: [-9, 3, 8, 13, 27],
  England: [3, 8, 12, 16, 24],
  Kentucky: [-3, 8, 14, 20, 30]
};

const labels = [
  "Winter mean low",
  "Annual mean low",
  "Annual mean",
  "Annual mean high",
  "Summer mean high"
];

rangeChart(
  ranges,
  labels,
  "rangePlot",
  "Temperature Ranges in Three Londons (range)"
);

Image

That being said, having this chart-type built in would be great. The mental gymnastics are a bit tricky to get a true range chart working correctly.

Here are the built-in ways to achieve a similar chart:

Code snippet
// Data for the three Londons
const ranges = {
  Ontario: [-9, 3, 8, 13, 27],
  England: [3, 8, 12, 16, 24],
  Kentucky: [-3, 8, 14, 20, 30]
};

const labels = [
  "Winter mean low",
  "Annual mean low",
  "Annual mean",
  "Annual mean high",
  "Summer mean high"
];
const cities = Object.keys(ranges);

// Scatter plot traces
const scatterTraces = labels.map((label, index) => ({
  x: cities,
  y: cities.map((city) => ranges[city][index]),
  mode: "markers",
  name: label,
  type: "scatter"
}));

const scatterLayout = {
  title: "Temperature Ranges in Three Londons (scatter)",
  xaxis: { title: "City" },
  yaxis: { title: "Temperature" }
};

Plotly.newPlot("scatterPlot", scatterTraces, scatterLayout);

// Bar plot traces
const barTraces = labels.map((label, index) => ({
  x: cities,
  y: cities.map((city) => ranges[city][index]),
  name: label,
  type: "bar"
}));

const barLayout = {
  title: "Temperature Ranges in Three Londons (overlay)",
  barmode: "overlay",
  xaxis: { title: "City" },
  yaxis: { title: "Temperature" }
};

Plotly.newPlot("barPlot", barTraces, barLayout);

// Bar plot traces
const stackedBarTraces = labels.map((label, index) => ({
  x: cities,
  y: cities.map((city) => ranges[city][index]),
  name: label,
  type: "bar"
}));

const stackedBarLayout = {
  title: "Temperature Ranges in Three Londons (stacked)",
  barmode: "stack",
  xaxis: { title: "City" },
  yaxis: { title: "Temperature" }
};

Plotly.newPlot("stackedBarPlot", stackedBarTraces, stackedBarLayout);

However, these aren't quite right.

  • The scatter plot is most legible, but doesn't depict a range
  • The overlaid bar shows the right data, but because the base of all positive points is 0, they actually overlap on top of each other. We want the base to he previous, and for England, we want the base to be 3, not 0.
  • The stacked bar chart looks right at first glance, but it's actually summing all the temperatures (and of course, the base for England is at 0, not 3. And the negative values stack a bit weirdly.

Image

贡献指南

打开贡献指南

从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

调研方向

未识别出源文件、测试或入口点。请从 issue 的自定义 range-chart 示例开始,并将其行为与列出的 scatter、overlaid-bar 和 stacked-bar 方法进行比较;当 Plotly.js 原生支持 range-chart,并能正确处理非零基线和负基线时,即视为完成。

由索引模型根据 Issue 内容生成。

评估

技术栈
javascript
领域
data-visualization
Issue 类型
功能
难度
5/5
预计耗时
一周以上
活跃度
停滞
描述清晰度
基本清楚
新手友好度
35/100

把新 issue 发到你的邮箱

精选适合新手参与的 GitHub issue 摘要。