d3plot more or less works now

src/lib/d3plot.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
 import * as d3 from 'd3';
+    import { onMount } from 'svelte';
 
 export let data: {date: string, avgTemp: number}[] = [
   {date: "2023-01-01", avgTemp: 22},
@@ -26,156 +27,23 @@ export let data: {date: string, avgTemp: number}[] = [
   {date: "2023-01-22", avgTemp: 0},
   {date: "2023-01-23", avgTemp: -2},
 ];
-let vis;
 
-let chart = LineChart(data, { x: d.date, y: d.avgTemp, yLabel: 'Daily average temperature', width, height: 500, color: 'steelblue' })
+let vis: Element;
 
-// Copyright 2021 Observable, Inc.
+onMount(() => {
-// Released under the ISC license.
+  const xScale = d3.scaleBand().rangeRound([0, 500]).padding(0.1);
-// https://observablehq.com/@d3/line-with-tooltip
+  const yScale = d3.scaleLinear().domain([-10, 40]).range([200, 0]);
-function LineChart(data, {
+  const container = d3.select(vis);
-  x = ([x]) => x, // given d in data, returns the (temporal) x-value
+  container
-  y = ([, y]) => y, // given d in data, returns the (quantitative) y-value
+    .selectAll('rect')
-  title, // given d in data, returns the title text
+    .data(data)
-  defined, // for gaps in data
+    .enter()
-  curve = d3.curveLinear, // method of interpolation between points
+    .append('rect')
-  marginTop = 20, // top margin, in pixels
+    .attr('width', xScale.bandwidth())
-  marginRight = 30, // right margin, in pixels
+    .attr('heigth', (data) => yScale(data.avgTemp))
-  marginBottom = 30, // bottom margin, in pixels
+    .attr('fill', 'black')
-  marginLeft = 40, // left margin, in pixels
+})
-  width = 640, // outer width, in pixels
-  height = 400, // outer height, in pixels
-  xType = d3.scaleUtc, // type of x-scale
-  xDomain, // [xmin, xmax]
-  xRange = [marginLeft, width - marginRight], // [left, right]
-  yType = d3.scaleLinear, // type of y-scale
-  yDomain, // [ymin, ymax]
-  yRange = [height - marginBottom, marginTop], // [bottom, top]
-  color = "currentColor", // stroke color of line
-  strokeWidth = 1.5, // stroke width of line, in pixels
-  strokeLinejoin = "round", // stroke line join of line
-  strokeLinecap = "round", // stroke line cap of line
-  yFormat, // a format specifier string for the y-axis
-  yLabel, // a label for the y-axis
-} = {}) {
-  // Compute values.
-  const X = d3.map(data, x);
-  const Y = d3.map(data, y);
-  const O = d3.map(data, d => d);
-  const I = d3.map(data, (_, i) => i);
-
-  // Compute which data points are considered defined.
-  if (defined === undefined) defined = (d, i) => !isNaN(X[i]) && !isNaN(Y[i]);
-  const D = d3.map(data, defined);
-
-  // Compute default domains.
-  if (xDomain === undefined) xDomain = d3.extent(X);
-  if (yDomain === undefined) yDomain = [0, d3.max(Y)];
-
-  // Construct scales and axes.
-  const xScale = xType(xDomain, xRange);
-  const yScale = yType(yDomain, yRange);
-  const xAxis = d3.axisBottom(xScale).ticks(width / 80).tickSizeOuter(0);
-  const yAxis = d3.axisLeft(yScale).ticks(height / 40, yFormat);
-
-  // Compute titles.
-  if (title === undefined) {
-    const formatDate = xScale.tickFormat(null, "%b %-d, %Y");
-    const formatValue = yScale.tickFormat(100, yFormat);
-    title = i => `${formatDate(X[i])}\n${formatValue(Y[i])}`;
-  } else {
-    const O = d3.map(data, d => d);
-    const T = title;
-    title = i => T(O[i], i, data);
-  }
-
-  // Construct a line generator.
-  const line = d3.line()
-      .defined(i => D[i])
-      .curve(curve)
-      .x(i => xScale(X[i]))
-      .y(i => yScale(Y[i]));
-
-  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;")
-      .attr("font-family", "sans-serif")
-      .attr("font-size", 10)
-      .style("-webkit-tap-highlight-color", "transparent")
-      .style("overflow", "visible")
-      .on("pointerenter pointermove", pointermoved)
-      .on("pointerleave", pointerleft)
-      .on("touchstart", event => event.preventDefault());
-
-  svg.append("g")
-      .attr("transform", `translate(0,${height - marginBottom})`)
-      .call(xAxis);
-
-  svg.append("g")
-      .attr("transform", `translate(${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", -marginLeft)
-          .attr("y", 10)
-          .attr("fill", "currentColor")
-          .attr("text-anchor", "start")
-          .text(yLabel));
-
-  svg.append("path")
-      .attr("fill", "none")
-      .attr("stroke", color)
-      .attr("stroke-width", strokeWidth)
-      .attr("stroke-linejoin", strokeLinejoin)
-      .attr("stroke-linecap", strokeLinecap)
-      .attr("d", line(I));
-
-  const tooltip = svg.append("g")
-      .style("pointer-events", "none");
-
-  function pointermoved(event) {
-    const i = d3.bisectCenter(X, xScale.invert(d3.pointer(event)[0]));
-    tooltip.style("display", null);
-    tooltip.attr("transform", `translate(${xScale(X[i])},${yScale(Y[i])})`);
-
-    const path = tooltip.selectAll("path")
-      .data([,])
-      .join("path")
-        .attr("fill", "white")
-        .attr("stroke", "black");
-
-    const text = tooltip.selectAll("text")
-      .data([,])
-      .join("text")
-      .call(text => text
-        .selectAll("tspan")
-        .data(`${title(i)}`.split(/\n/))
-        .join("tspan")
-          .attr("x", 0)
-          .attr("y", (_, i) => `${i * 1.1}em`)
-          .attr("font-weight", (_, i) => i ? null : "bold")
-          .text(d => d));
-
-    const {x, y, width: w, height: h} = text.node().getBBox();
-    text.attr("transform", `translate(${-w / 2},${15 - y})`);
-    path.attr("d", `M${-w / 2 - 10},5H-5l5,-5l5,5H${w / 2 + 10}v${h + 20}h-${w + 20}z`);
-    svg.property("value", O[i]).dispatch("input", {bubbles: true});
-  }
-
-  function pointerleft() {
-    tooltip.style("display", "none");
-    svg.node().value = null;
-    svg.dispatch("input", {bubbles: true});
-  }
-
-  return Object.assign(svg.node(), {value: null});
-}
 </script>
 <main>
-  <div bind:this={vis}><svg bind:this={chart}></svg></div>
+  <svg bind:this={vis}></svg>
 </main>