third_party/bandchart/bandchart.js - build - Git at Google

 // Copyright 2021 Observable, Inc.
 // Released under the ISC license.
 // https://observablehq.com/@d3/band-chart

 function BandChart(data, {
 	defined,
 	marginTop = 50, // top margin, in pixels
 	marginRight = 15, // right margin, in pixels
 	marginBottom = 50, // bottom margin, in pixels
 	marginLeft = 50, // left margin, in pixels
 	width = 480, // outer width, in pixels
 	height = 240, // outer height, in pixels
 	unit,
 } = {}) {
 	// Compute values.
 	const C = d3.map(data, d => d.CommitHash);
 	const X = d3.map(data, d => d.CommitDate);
 	const Y = d3.map(data, d => d.Center);
 	const Y1 = d3.map(data, d => d.Low);
 	const Y2 = d3.map(data, d => d.High);
 	const I = d3.range(X.length);
 	if (defined === undefined) defined = (d, i) => !isNaN(X[i]) && !isNaN(Y1[i]) && !isNaN(Y2[i]);
 	const D = d3.map(data, defined);

 	const xRange = [marginLeft, width - marginRight]; // [left, right]
 	const yRange = [height - marginBottom, marginTop]; // [bottom, top]

 	// Compute default domains.
 	let yDomain = d3.nice(...d3.extent([...Y1, ...Y2]), 10);

 	// Determine Y domain.
 	//
 	// Three cases:
 	// (1) All data is above Y=0 line.
 	// (2) All data is below Y=0 line.
 	// (3) Data crosses the Y=0 line.
 	//
 	// For (1) set the Y=0 line as the bottom of the domain.
 	// For (2) set it at the top.
 	// For (3) make sure the Y=0 line is in the middle.
 	//
 	// Finally, make sure we don't get closer than 0.025,
 	// bceuase otherwise it just looks really noisy.
 	const minYDomain = [-0.025, 0.025];
 	if (yDomain[0] > 0) {
 		// (1)
 		yDomain[0] = 0;
 		if (yDomain[1] < minYDomain[1]) {
 			yDomain[1] = minYDomain[1];
 		}
 	} else if (yDomain[1] < 0) {
 		// (2)
 		yDomain[1] = 0;
 		if (yDomain[0] > minYDomain[0]) {
 			yDomain[0] = minYDomain[0];
 		}
 	} else {
 		// (3)
 		if (Math.abs(yDomain[1]) > Math.abs(yDomain[0])) {
 			yDomain[0] = -Math.abs(yDomain[1]);
 		} else {
 			yDomain[1] = Math.abs(yDomain[0]);
 		}
 		if (yDomain[0] > minYDomain[0]) {
 			yDomain[0] = minYDomain[0];
 		}
 		if (yDomain[1] < minYDomain[1]) {
 			yDomain[1] = minYDomain[1];
 		}
 	}

 	// Construct scales and axes.
 	const xOrdTicks = d3.range(xRange[0], xRange[1], (xRange[1]-xRange[0])/(X.length-1));
 	xOrdTicks.push(xRange[1]);
 	const xScale = d3.scaleOrdinal(X, xOrdTicks);
 	const yScale = d3.scaleLinear(yDomain, yRange);
 	const yAxis = d3.axisLeft(yScale).ticks(height / 40, "+%");

 	const svg = d3.create("svg")
 		.attr("width", width)
 		.attr("height", height)
 		.attr("viewBox", [0, 0, width, height])
 		.attr("style", "max-width: 100%; height: auto; height: intrinsic;");

 	svg.append("g")
 		.attr("transform", `translate(${marginLeft},0)`)
 		.call(yAxis)
 		.call(g => g.select(".domain").remove())
 		.call(g => g.selectAll(".tick line").clone()
 			.attr("x2", width - marginLeft - marginRight)
 			.attr("stroke-opacity", 0.1))
 		.call(g => g.append("text")
 			.attr("x", (xRange[1]-xRange[0])/2)
 			.attr("y", 40)
 			.attr("fill", "currentColor")
 			.attr("text-anchor", "middle")
 			.attr("font-size", "20px")
 			.attr("font-weight", "bold")
 			.text(unit));

 	const defs = svg.append("defs")

 	const maxHalfColorValue = 0.10;
 	const maxHalfColorOpacity = 0.5;

 	// Draw top half.
 	const goodColor = "#005AB5";
 	const badColor = "#DC3220";

 	// By default, lower is better.
 	var bottomColor = goodColor;
 	var topColor = badColor;
 	const higherIsBetter = {
 		"B/s": true,
 		"ops/s": true
 	};
 	if (unit in higherIsBetter) {
 		bottomColor = badColor;
 		topColor = goodColor;
 	}

 	// IDs, even within SVGs, are shared across the entire page. (what?)
 	// So, at least try to avoid a collision.
 	const gradientIDSuffix = Math.random()*10000000.0;

 	const topGradient = defs.append("linearGradient")
 		.attr("id", "topGradient"+gradientIDSuffix)
 		.attr("x1", "0%")
 		.attr("x2", "0%")
 		.attr("y1", "100%")
 		.attr("y2", "0%");
 	topGradient.append("stop")
 		.attr("offset", "0%")
 		.style("stop-color", topColor)
 		.style("stop-opacity", 0);
 	let topGStopOpacity = maxHalfColorOpacity;
 	let topGOffsetPercent = 100.0;
 	if (yDomain[1] > maxHalfColorValue) {
 		topGOffsetPercent *= maxHalfColorValue/yDomain[1];
 	} else {
 		topGStopOpacity *= yDomain[1]/maxHalfColorValue;
 	}
 	topGradient.append("stop")
 		.attr("offset", topGOffsetPercent+"%")
 		.style("stop-color", topColor)
 		.style("stop-opacity", topGStopOpacity);

 	const bottomGradient = defs.append("linearGradient")
 		.attr("id", "bottomGradient"+gradientIDSuffix)
 		.attr("x1", "0%")
 		.attr("x2", "0%")
 		.attr("y1", "0%")
 		.attr("y2", "100%");
 	bottomGradient.append("stop")
 		.attr("offset", "0%")
 		.style("stop-color", bottomColor)
 		.style("stop-opacity", 0);
 	let bottomGStopOpacity = maxHalfColorOpacity;
 	let bottomGOffsetPercent = 100.0;
 	if (yDomain[0] < -maxHalfColorValue) {
 		bottomGOffsetPercent *= -maxHalfColorValue/yDomain[0];
 	} else {
 		bottomGStopOpacity *= -yDomain[0]/maxHalfColorValue;
 	}
 	bottomGradient.append("stop")
 		.attr("offset", bottomGOffsetPercent+"%")
 		.style("stop-color", bottomColor)
 		.style("stop-opacity", bottomGStopOpacity);

 	// Top half color.
 	svg.append("rect")
 		.attr("fill", "url(#topGradient"+gradientIDSuffix+")")
 		.attr("x", xRange[0])
 		.attr("y", yScale(yDomain[1]))
 		.attr("width", xRange[1] - xRange[0])
 		.attr("height", (yDomain[1]/(yDomain[1]-yDomain[0]))*(height-marginTop-marginBottom));

 	// Bottom half color.
 	svg.append("rect")
 		.attr("fill", "url(#bottomGradient"+gradientIDSuffix+")")
 		.attr("x", xRange[0])
 		.attr("y", yScale(0))
 		.attr("width", xRange[1] - xRange[0])
 		.attr("height", (-yDomain[0]/(yDomain[1]-yDomain[0]))*(height-marginTop-marginBottom));

 	// Add a harder gridline for Y=0 to make it stand out.

 	const line0 = d3.line()
 		.defined(i => D[i])
 		.x(i => xScale(X[i]))
 		.y(i => yScale(0))

 	svg.append("path")
 		.attr("fill", "none")
 		.attr("stroke", "#999999")
 		.attr("stroke-width", 2)
 		.attr("d", line0(I))

 	// Create CI area.

 	const area = d3.area()
 		.defined(i => D[i])
 		.curve(d3.curveLinear)
 		.x(i => xScale(X[i]))
 		.y0(i => yScale(Y1[i]))
 		.y1(i => yScale(Y2[i]));

 	svg.append("path")
 		.attr("fill", "black")
 		.attr("opacity", 0.1)
 		.attr("d", area(I));

 	// Add X axis label.
 	svg.append("text")
 		.attr("x", xRange[0] + (xRange[1]-xRange[0])/2)
 		.attr("y", yRange[0] + (yRange[0]-yRange[1])*0.12)
 		.attr("fill", "currentColor")
 		.attr("text-anchor", "middle")
 		.attr("font-size", "12px")
 		.text("Commits");

 	// Create center line.

 	const line = d3.line()
 		.defined(i => D[i])
 		.x(i => xScale(X[i]))
 		.y(i => yScale(Y[i]))

 	svg.append("path")
 		.attr("fill", "none")
 		.attr("stroke", "#212121")
 		.attr("stroke-width", 2.5)
 		.attr("d", line(I))

 	// Divide the chart into columns and apply links and hover actions to them.
 	svg.append("g")
 		.attr("stroke", "#2074A0")
 		.attr("stroke-opacity", 0)
 		.attr("fill", "none")
 		.selectAll("path")
 		.data(I)
 		.join("a")
 			.attr("xlink:href", (d, i) => "https://go.googlesource.com/go/+show/"+C[i])
 			.append("rect")
 				.attr("pointer-events", "all")
 				.attr("x", (d, i) => {
 					if (i == 0) {
 						return xOrdTicks[i];
 					}
 					return xOrdTicks[i-1]+(xOrdTicks[i]-xOrdTicks[i-1])/2;
 				})
 				.attr("y", marginTop)
 				.attr("width", (d, i) => {
 					if (i == 0 || i == X.length-1) {
 						return (xOrdTicks[1]-xOrdTicks[0]) / 2;
 					}
 					return xOrdTicks[1]-xOrdTicks[0];
 				})
 				.attr("height", height-marginTop-marginBottom)
 				.on("mouseover", (d, i) => {
 					svg.append('a')
 						.attr("class", "tooltip")
 						.call(g => g.append('line')
 							.attr("x1", xScale(X[i]))
 							.attr("y1", yRange[0])
 							.attr("x2", xScale(X[i]))
 							.attr("y2", yRange[1])
 							.attr("stroke", "black")
 							.attr("stroke-width", 1)
 							.attr("stroke-dasharray", 2)
 							.attr("opacity", 0.5)
 							.attr("pointer-events", "none")
 						)
 						.call(g => g.append('text')
 							.attr("x", (() => {
 								let base = xScale(X[i]);
 								if (base < marginLeft+100) {
 									base += 10;
 								} else if (base > width-marginRight-100) {
 									base -= 10;
 								}
 								return base;
 							})())
 							.attr("y", (() => {
 								let base = yScale(Y[i]);
 								if (base < marginTop+100) {
 									base += 30;
 								} else if (base > height-marginBottom-100) {
 									base -= 30;
 								}
 								return base;
 							}))
 							.attr("pointer-events", "none")
 							.attr("fill", "currentColor")
 							.attr("text-anchor", (() => {
 								let base = xScale(X[i]);
 								if (base < marginLeft+100) {
 									return "start";
 								} else if (base > width-marginRight-100) {
 									return "end";
 								}
 								return "middle";
 							})())
 							.attr("font-family", "sans-serif")
 							.attr("font-size", 12)
 							.text(C[i].slice(0, 7) + " ("
 								+ Intl.DateTimeFormat([], {
 									dateStyle: "long",
 									timeStyle: "short"
 								}).format(X[i])
 								+ ")")
 						)
 				})
 				.on("mouseout", () => svg.selectAll('.tooltip').remove());

 	return svg.node();
 }
	// Copyright 2021 Observable, Inc.
	// Released under the ISC license.
	// https://observablehq.com/@d3/band-chart

	function BandChart(data, {
	defined,
	marginTop = 50, // top margin, in pixels
	marginRight = 15, // right margin, in pixels
	marginBottom = 50, // bottom margin, in pixels
	marginLeft = 50, // left margin, in pixels
	width = 480, // outer width, in pixels
	height = 240, // outer height, in pixels
	unit,
	} = {}) {
	// Compute values.
	const C = d3.map(data, d => d.CommitHash);
	const X = d3.map(data, d => d.CommitDate);
	const Y = d3.map(data, d => d.Center);
	const Y1 = d3.map(data, d => d.Low);
	const Y2 = d3.map(data, d => d.High);
	const I = d3.range(X.length);
	if (defined === undefined) defined = (d, i) => !isNaN(X[i]) && !isNaN(Y1[i]) && !isNaN(Y2[i]);
	const D = d3.map(data, defined);

	const xRange = [marginLeft, width - marginRight]; // [left, right]
	const yRange = [height - marginBottom, marginTop]; // [bottom, top]

	// Compute default domains.
	let yDomain = d3.nice(...d3.extent([...Y1, ...Y2]), 10);

	// Determine Y domain.
	//
	// Three cases:
	// (1) All data is above Y=0 line.
	// (2) All data is below Y=0 line.
	// (3) Data crosses the Y=0 line.
	//
	// For (1) set the Y=0 line as the bottom of the domain.
	// For (2) set it at the top.
	// For (3) make sure the Y=0 line is in the middle.
	//
	// Finally, make sure we don't get closer than 0.025,
	// bceuase otherwise it just looks really noisy.
	const minYDomain = [-0.025, 0.025];
	if (yDomain[0] > 0) {
	// (1)
	yDomain[0] = 0;
	if (yDomain[1] < minYDomain[1]) {
	yDomain[1] = minYDomain[1];
	}
	} else if (yDomain[1] < 0) {
	// (2)
	yDomain[1] = 0;
	if (yDomain[0] > minYDomain[0]) {
	yDomain[0] = minYDomain[0];
	}
	} else {
	// (3)
	if (Math.abs(yDomain[1]) > Math.abs(yDomain[0])) {
	yDomain[0] = -Math.abs(yDomain[1]);
	} else {
	yDomain[1] = Math.abs(yDomain[0]);
	}
	if (yDomain[0] > minYDomain[0]) {
	yDomain[0] = minYDomain[0];
	}
	if (yDomain[1] < minYDomain[1]) {
	yDomain[1] = minYDomain[1];
	}
	}

	// Construct scales and axes.
	const xOrdTicks = d3.range(xRange[0], xRange[1], (xRange[1]-xRange[0])/(X.length-1));
	xOrdTicks.push(xRange[1]);
	const xScale = d3.scaleOrdinal(X, xOrdTicks);
	const yScale = d3.scaleLinear(yDomain, yRange);
	const yAxis = d3.axisLeft(yScale).ticks(height / 40, "+%");

	const svg = d3.create("svg")
	.attr("width", width)
	.attr("height", height)
	.attr("viewBox", [0, 0, width, height])
	.attr("style", "max-width: 100%; height: auto; height: intrinsic;");

	svg.append("g")
	.attr("transform", `translate(${marginLeft},0)`)
	.call(yAxis)
	.call(g => g.select(".domain").remove())
	.call(g => g.selectAll(".tick line").clone()
	.attr("x2", width - marginLeft - marginRight)
	.attr("stroke-opacity", 0.1))
	.call(g => g.append("text")
	.attr("x", (xRange[1]-xRange[0])/2)
	.attr("y", 40)
	.attr("fill", "currentColor")
	.attr("text-anchor", "middle")
	.attr("font-size", "20px")
	.attr("font-weight", "bold")
	.text(unit));

	const defs = svg.append("defs")

	const maxHalfColorValue = 0.10;
	const maxHalfColorOpacity = 0.5;

	// Draw top half.
	const goodColor = "#005AB5";
	const badColor = "#DC3220";

	// By default, lower is better.
	var bottomColor = goodColor;
	var topColor = badColor;
	const higherIsBetter = {
	"B/s": true,
	"ops/s": true
	};
	if (unit in higherIsBetter) {
	bottomColor = badColor;
	topColor = goodColor;
	}

	// IDs, even within SVGs, are shared across the entire page. (what?)
	// So, at least try to avoid a collision.
	const gradientIDSuffix = Math.random()*10000000.0;

	const topGradient = defs.append("linearGradient")
	.attr("id", "topGradient"+gradientIDSuffix)
	.attr("x1", "0%")
	.attr("x2", "0%")
	.attr("y1", "100%")
	.attr("y2", "0%");
	topGradient.append("stop")
	.attr("offset", "0%")
	.style("stop-color", topColor)
	.style("stop-opacity", 0);
	let topGStopOpacity = maxHalfColorOpacity;
	let topGOffsetPercent = 100.0;
	if (yDomain[1] > maxHalfColorValue) {
	topGOffsetPercent *= maxHalfColorValue/yDomain[1];
	} else {
	topGStopOpacity *= yDomain[1]/maxHalfColorValue;
	}
	topGradient.append("stop")
	.attr("offset", topGOffsetPercent+"%")
	.style("stop-color", topColor)
	.style("stop-opacity", topGStopOpacity);

	const bottomGradient = defs.append("linearGradient")
	.attr("id", "bottomGradient"+gradientIDSuffix)
	.attr("x1", "0%")
	.attr("x2", "0%")
	.attr("y1", "0%")
	.attr("y2", "100%");
	bottomGradient.append("stop")
	.attr("offset", "0%")
	.style("stop-color", bottomColor)
	.style("stop-opacity", 0);
	let bottomGStopOpacity = maxHalfColorOpacity;
	let bottomGOffsetPercent = 100.0;
	if (yDomain[0] < -maxHalfColorValue) {
	bottomGOffsetPercent *= -maxHalfColorValue/yDomain[0];
	} else {
	bottomGStopOpacity *= -yDomain[0]/maxHalfColorValue;
	}
	bottomGradient.append("stop")
	.attr("offset", bottomGOffsetPercent+"%")
	.style("stop-color", bottomColor)
	.style("stop-opacity", bottomGStopOpacity);

	// Top half color.
	svg.append("rect")
	.attr("fill", "url(#topGradient"+gradientIDSuffix+")")
	.attr("x", xRange[0])
	.attr("y", yScale(yDomain[1]))
	.attr("width", xRange[1] - xRange[0])
	.attr("height", (yDomain[1]/(yDomain[1]-yDomain[0]))*(height-marginTop-marginBottom));

	// Bottom half color.
	svg.append("rect")
	.attr("fill", "url(#bottomGradient"+gradientIDSuffix+")")
	.attr("x", xRange[0])
	.attr("y", yScale(0))
	.attr("width", xRange[1] - xRange[0])
	.attr("height", (-yDomain[0]/(yDomain[1]-yDomain[0]))*(height-marginTop-marginBottom));

	// Add a harder gridline for Y=0 to make it stand out.

	const line0 = d3.line()
	.defined(i => D[i])
	.x(i => xScale(X[i]))
	.y(i => yScale(0))

	svg.append("path")
	.attr("fill", "none")
	.attr("stroke", "#999999")
	.attr("stroke-width", 2)
	.attr("d", line0(I))

	// Create CI area.

	const area = d3.area()
	.defined(i => D[i])
	.curve(d3.curveLinear)
	.x(i => xScale(X[i]))
	.y0(i => yScale(Y1[i]))
	.y1(i => yScale(Y2[i]));

	svg.append("path")
	.attr("fill", "black")
	.attr("opacity", 0.1)
	.attr("d", area(I));

	// Add X axis label.
	svg.append("text")
	.attr("x", xRange[0] + (xRange[1]-xRange[0])/2)
	.attr("y", yRange[0] + (yRange[0]-yRange[1])*0.12)
	.attr("fill", "currentColor")
	.attr("text-anchor", "middle")
	.attr("font-size", "12px")
	.text("Commits");

	// Create center line.

	const line = d3.line()
	.defined(i => D[i])
	.x(i => xScale(X[i]))
	.y(i => yScale(Y[i]))

	svg.append("path")
	.attr("fill", "none")
	.attr("stroke", "#212121")
	.attr("stroke-width", 2.5)
	.attr("d", line(I))

	// Divide the chart into columns and apply links and hover actions to them.
	svg.append("g")
	.attr("stroke", "#2074A0")
	.attr("stroke-opacity", 0)
	.attr("fill", "none")
	.selectAll("path")
	.data(I)
	.join("a")
	.attr("xlink:href", (d, i) => "https://go.googlesource.com/go/+show/"+C[i])
	.append("rect")
	.attr("pointer-events", "all")
	.attr("x", (d, i) => {
	if (i == 0) {
	return xOrdTicks[i];
	}
	return xOrdTicks[i-1]+(xOrdTicks[i]-xOrdTicks[i-1])/2;
	})
	.attr("y", marginTop)
	.attr("width", (d, i) => {
	if (i == 0 \|\| i == X.length-1) {
	return (xOrdTicks[1]-xOrdTicks[0]) / 2;
	}
	return xOrdTicks[1]-xOrdTicks[0];
	})
	.attr("height", height-marginTop-marginBottom)
	.on("mouseover", (d, i) => {
	svg.append('a')
	.attr("class", "tooltip")
	.call(g => g.append('line')
	.attr("x1", xScale(X[i]))
	.attr("y1", yRange[0])
	.attr("x2", xScale(X[i]))
	.attr("y2", yRange[1])
	.attr("stroke", "black")
	.attr("stroke-width", 1)
	.attr("stroke-dasharray", 2)
	.attr("opacity", 0.5)
	.attr("pointer-events", "none")
	)
	.call(g => g.append('text')
	.attr("x", (() => {
	let base = xScale(X[i]);
	if (base < marginLeft+100) {
	base += 10;
	} else if (base > width-marginRight-100) {
	base -= 10;
	}
	return base;
	})())
	.attr("y", (() => {
	let base = yScale(Y[i]);
	if (base < marginTop+100) {
	base += 30;
	} else if (base > height-marginBottom-100) {
	base -= 30;
	}
	return base;
	}))
	.attr("pointer-events", "none")
	.attr("fill", "currentColor")
	.attr("text-anchor", (() => {
	let base = xScale(X[i]);
	if (base < marginLeft+100) {
	return "start";
	} else if (base > width-marginRight-100) {
	return "end";
	}
	return "middle";
	})())
	.attr("font-family", "sans-serif")
	.attr("font-size", 12)
	.text(C[i].slice(0, 7) + " ("
	+ Intl.DateTimeFormat([], {
	dateStyle: "long",
	timeStyle: "short"
	}).format(X[i])
	+ ")")
	)
	})
	.on("mouseout", () => svg.selectAll('.tooltip').remove());

	return svg.node();
	}