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add plugin to draw crosshair to track y at x
and refactor js to use start using modules
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| const chartStates = new WeakMap(); | ||
| const crosshairs = { | ||
| id: "chartjs-crosshairs", | ||
|
|
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| defaults: { | ||
| color: "black", | ||
| lineWidth: 1, | ||
| }, | ||
|
|
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| beforeInit(chart) {}, | ||
|
|
||
| // https://stackoverflow.com/a/77663018/23104322 | ||
| afterEvent(chart, args, options) { | ||
| const { ctx, chartArea } = chart; | ||
|
|
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| switch (args.event.type) { | ||
| case "mousemove": | ||
| drawCrosshair(chart, { x: args.event.x, y: args.event.y }); | ||
| break; | ||
| } | ||
| }, | ||
|
|
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| afterDatasetsDraw(chart, args, options) {}, | ||
| }; | ||
|
|
||
| function drawCrosshair(chart, coord) { | ||
| const { canvas, ctx, chartArea, scales } = chart; | ||
| if (!scales.y) { | ||
| return; | ||
| } | ||
| if ( | ||
| chartArea.right >= coord.x && | ||
| coord.x >= chartArea.left && | ||
| chartArea.bottom >= coord.y && | ||
| coord.y >= chartArea.top | ||
| ) { | ||
| canvas.style.cursor = "crosshair"; | ||
|
|
||
| ctx.lineWidth = 1; | ||
| ctx.setLineDash([3, 3]); | ||
|
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| ctx.beginPath(); | ||
| ctx.moveTo(chartArea.left, coord.y); | ||
| ctx.lineTo(chartArea.right, coord.y); | ||
| ctx.stroke(); | ||
| ctx.closePath(); | ||
|
|
||
| // draw y-value | ||
| const yTipHeight = 10; | ||
| ctx.beginPath(); | ||
| ctx.fillStyle = "grey"; | ||
| ctx.moveTo(chartArea.left, coord.y); | ||
| ctx.lineTo(chartArea.left - yTipHeight / 2, coord.y + yTipHeight); | ||
| ctx.lineTo(0, coord.y + yTipHeight); | ||
| ctx.lineTo(0, coord.y - yTipHeight); | ||
| ctx.lineTo(chartArea.left - yTipHeight / 2, coord.y - yTipHeight); | ||
| ctx.fill(); | ||
| ctx.closePath(); | ||
| ctx.fillStyle = "white"; | ||
| ctx.textBaseline = "middle"; | ||
| ctx.textAlign = "right"; | ||
| ctx.fillText( | ||
| scales.y.getValueForPixel(coord.y).toFixed(2), | ||
| chartArea.left - yTipHeight / 2, | ||
| coord.y, | ||
| ); | ||
|
|
||
| ctx.beginPath(); | ||
| ctx.moveTo(coord.x, chartArea.top); | ||
| ctx.lineTo(coord.x, chartArea.bottom); | ||
| ctx.stroke(); | ||
| ctx.closePath(); | ||
| } else { | ||
| canvas.style.cursor = "default"; | ||
| } | ||
| } | ||
|
|
||
| export { crosshairs }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,20 @@ | ||
| let og_datasets; | ||
|
|
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| function toggleView(elem, chart) { | ||
| if (elem.checked) { | ||
| og_datasets = chart.data.datasets.map((dataset) => { | ||
| return dataset.data; | ||
| }); | ||
| const total = og_datasets.reduce((r, a) => r.map((b, i) => a[i] + b)); | ||
| for (const [index, data] of og_datasets.entries()) { | ||
| chart.data.datasets[index].data = data.map((a, i) => (a / total[i]) * 100); | ||
| } | ||
| } else { | ||
| for (const [index, data] of og_datasets.entries()) { | ||
| chart.data.datasets[index].data = data; | ||
| } | ||
| } | ||
| chart.update(); | ||
| } | ||
|
|
||
| export { toggleView }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| // https://www.chartjs.org/docs/latest/developers/updates.html | ||
| function addData(chart, newData, labels) { | ||
| for (const data of newData) { | ||
| chart.data.datasets.push(data); | ||
| } | ||
| if (labels != null) { | ||
| chart.data.labels = labels; | ||
| } | ||
| chart.update(); | ||
| } | ||
|
|
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| function displayPrices(chart, table, data) { | ||
| const prices = data.indicators.quote[0].close; | ||
| // ideally, should check overlap of labels between datasets | ||
| table.updateOrAddData(data.timestamp.map((a, i) => ({ date: a, [data.meta.symbol]: prices[i] }))); | ||
| if (!table.columnManager.columns.length) { | ||
| table.addColumn({ title: "Date", field: "date", frozen: true }, true); | ||
| } | ||
| table.addColumn({ | ||
| title: data.meta.symbol, | ||
| field: data.meta.symbol, | ||
| hozAlign: "right", | ||
| headerSort: false, | ||
| formatter: "money", | ||
| formatterParams: { thousand: false }, | ||
| }); | ||
| chart.data.labels = data.timestamp; | ||
| // change prices to percentage so it's comparable | ||
| chart.data.datasets.push({ | ||
| label: data.meta.symbol, | ||
| data: prices.map((x) => ((x - prices[0]) / prices[0]) * 100), | ||
| }); | ||
| chart.update(); | ||
| } | ||
|
|
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| function setupResponseHandlers() { | ||
| document.body.addEventListener("displayPrices", function (evt) { | ||
| const chart = Chart.getChart(evt.detail.target); | ||
| const table = Tabulator.findTable("#priceTable")[0]; | ||
| const data = JSON.parse(document.getElementById(evt.detail.dataId).textContent); | ||
| displayPrices(chart, table, data); | ||
| document.getElementById(evt.detail.dataId).remove(); | ||
| }); | ||
|
|
||
| // chartjs + htmx with payload in HX-Trigger | ||
| document.body.addEventListener("drawChart", function (evt) { | ||
| const chart = Chart.getChart(evt.detail.target); | ||
| // https://www.reddit.com/r/htmx/comments/10sdk43/comment/j72m2j7/ | ||
| const data = JSON.parse(document.getElementById(evt.detail.dataId).textContent); | ||
| addData(chart, data.datasets, data.labels); | ||
| document.getElementById(evt.detail.dataId).remove(); | ||
| }); | ||
| } | ||
|
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| const isKeyDown = (() => { | ||
| // https://stackoverflow.com/a/48750898 | ||
| const state = {}; | ||
|
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| // biome-ignore lint: let it mod | ||
| window.addEventListener("keyup", (e) => (state[e.key] = false)); | ||
| // biome-ignore lint: let it mod | ||
| window.addEventListener("keydown", (e) => (state[e.key] = true)); | ||
|
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| return (key) => (Object.hasOwn(state, key) && state[key]) || false; | ||
| })(); | ||
|
|
||
| export { isKeyDown, setupResponseHandlers }; |
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