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gradient-fill.html
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gradient-fill.html
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Gradient Fill</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="../dist/uPlot.min.css">
<style>
.uplot {
margin-bottom: 30px;
}
</style>
</head>
<body>
<script type="module">
import uPlot from "../dist/uPlot.esm.js";
let can = document.createElement("canvas");
let ctx = can.getContext("2d");
function scaleGradient(u, scaleKey, scaleStops) {
let min = scaleStops[0][0];
let max = scaleStops[scaleStops.length - 1][0];
let rng = max - min;
let minPos = u.valToPos(min, scaleKey, true);
let maxPos = u.valToPos(max, scaleKey, true);
let grd = ctx.createLinearGradient(0, minPos, 0, maxPos);
scaleStops.forEach(s => {
let pct = (s[0] - min) / rng;
grd.addColorStop(pct, s[1]);
});
return grd;
}
const opts = {
title: "Scale-aligned gradient fills",
width: 1920,
height: 600,
legend: {
// show: false,
fill: (u, seriesIdx) => u.series[seriesIdx].stroke(u, seriesIdx),
},
scales: {
x: {
time: false,
}
},
series: [
{},
{
label: "Tank 1 (red = high pressure)",
width: 4,
stroke: "lime",
fill: (u, seriesIdx) => {
let s = u.series[seriesIdx];
return scaleGradient(u, s.scale, [
[30, "green"],
[50, "orange"],
[60, "red"],
]);
},
},
{
label: "Tank 2 (red = low pressure)",
width: 4,
stroke: "magenta",
fill: (u, seriesIdx) => {
let s = u.series[seriesIdx];
return scaleGradient(u, s.scale, [
[0, "red"],
[10, "orange"],
[20, "green"]
]);
},
},
],
};
let data = [
[0, 1, 2, 3, 4, 5],
[10, 20, 30, 40, 50, 60],
[1, 3, 5, 8, 15, 20],
];
let u = new uPlot(opts, data, document.body);
function gradient(u, stops) {
let grd = ctx.createLinearGradient(0, u.bbox.top, 0, u.bbox.top + u.bbox.height);
stops.forEach(s => {
grd.addColorStop(s[0], s[1]);
});
return grd;
}
const opts2 = {
title: "Height-aligned gradient fills",
width: 1920,
height: 600,
legend: {
// show: false,
fill: (u, seriesIdx) => u.series[seriesIdx].stroke(u, seriesIdx),
},
scales: {
x: {
time: false,
}
},
series: [
{},
{
label: "Tank 1",
width: 4,
stroke: "lime",
fill: (u, seriesIdx) => {
return gradient(u, [
[1, "green"],
[0.5, "orange"],
[0, "red"],
])
},
},
],
};
let u2 = new uPlot(opts2, data, document.body);
</script>
</body>
</html>