add native range charts
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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)"
);
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
baseof all positive points is0, they actually overlap on top of each other. We want the base to he previous, and for England, we want the base to be3, not0. - The stacked bar chart looks right at first glance, but it's actually summing all the temperatures (and of course, the
basefor England is at0, not3. And the negative values stack a bit weirdly.
贡献指南
从这里开始
- 先读完整个 Issue,再读项目的贡献指南。
- 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
- Fork 仓库,在一个分支上完成修改。
- 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
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- 一周以上
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- 35/100