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implement disp.y0 & disp.y1 in bars pathBuilder opts (#634)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,215 @@ | ||
| <!doctype html> | ||
| <html> | ||
| <head> | ||
| <meta charset="utf-8"> | ||
| <title>Sparkline + Floating Bars + Gradients</title> | ||
| <meta name="viewport" content="width=device-width, initial-scale=1"> | ||
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| <link rel="stylesheet" href="../dist/uPlot.min.css"> | ||
| </head> | ||
| <body> | ||
| <script src="../dist/uPlot.iife.js"></script> | ||
| <script> | ||
| let can = document.createElement("canvas"); | ||
| let ctx = can.getContext("2d"); | ||
|
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| function scaleGradient(u, scaleKey, ori, scaleStops, discrete = false) { | ||
| let scale = u.scales[scaleKey]; | ||
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| // we want the stop below or at the scaleMax | ||
| // and the stop below or at the scaleMin, else the stop above scaleMin | ||
| let minStopIdx; | ||
| let maxStopIdx; | ||
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| for (let i = 0; i < scaleStops.length; i++) { | ||
| let stopVal = scaleStops[i][0]; | ||
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| if (stopVal <= scale.min || minStopIdx == null) | ||
| minStopIdx = i; | ||
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| maxStopIdx = i; | ||
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| if (stopVal >= scale.max) | ||
| break; | ||
| } | ||
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| if (minStopIdx == maxStopIdx) | ||
| return scaleStops[minStopIdx][1]; | ||
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| let minStopVal = scaleStops[minStopIdx][0]; | ||
| let maxStopVal = scaleStops[maxStopIdx][0]; | ||
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| if (minStopVal == -Infinity) | ||
| minStopVal = scale.min; | ||
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| if (maxStopVal == Infinity) | ||
| maxStopVal = scale.max; | ||
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| let minStopPos = u.valToPos(minStopVal, scaleKey, true); | ||
| let maxStopPos = u.valToPos(maxStopVal, scaleKey, true); | ||
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| let range = minStopPos - maxStopPos; | ||
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| let x0, y0, x1, y1; | ||
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| if (ori == 1) { | ||
| x0 = x1 = 0; | ||
| y0 = minStopPos; | ||
| y1 = maxStopPos; | ||
| } | ||
| else { | ||
| y0 = y1 = 0; | ||
| x0 = minStopPos; | ||
| x1 = maxStopPos; | ||
| } | ||
|
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| let grd = ctx.createLinearGradient(x0, y0, x1, y1); | ||
|
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| let prevColor; | ||
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| for (let i = minStopIdx; i <= maxStopIdx; i++) { | ||
| let s = scaleStops[i]; | ||
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| let stopPos = i == minStopIdx ? minStopPos : i == maxStopIdx ? maxStopPos : u.valToPos(s[0], scaleKey, true); | ||
| let pct = (minStopPos - stopPos) / range; | ||
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| if (discrete && i > minStopIdx) | ||
| grd.addColorStop(pct, prevColor); | ||
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| grd.addColorStop(pct, prevColor = s[1]); | ||
| } | ||
|
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| return grd; | ||
| } | ||
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| let data = [ | ||
| [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16], | ||
| [5, -5, 0, 1, 5, 9, 10, 15, 5, -10, -15, -20, -20, -5, 0, 5], | ||
| ]; | ||
|
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| // bar lows & highs | ||
| data.push(data[1].map(v => v - 5)); | ||
| data.push(data[1].map(v => v + 5)); | ||
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| let opts = { | ||
| width: 800, | ||
| height: 400, | ||
| drawOrder: ["series", "axes"], | ||
| cursor: {show: false}, | ||
| select: {show: false}, | ||
| legend: {show: false}, | ||
| scales: { | ||
| x: { | ||
| time: false | ||
| }, | ||
| y: { | ||
| range: (u, dataMin, dataMax) => [dataMin, dataMax], | ||
| } | ||
| }, | ||
| axes: [ | ||
| { | ||
| show: false, | ||
| }, | ||
| { | ||
| size: 0, | ||
| splits: [0], | ||
| ticks: { | ||
| show: false, | ||
| }, | ||
| grid: { | ||
| width: 1, | ||
| stroke: "gray", | ||
| dash: [3, 3], | ||
| } | ||
| } | ||
| ], | ||
| series: [ | ||
| {}, | ||
| { | ||
| points: { | ||
| show: false, | ||
| }, | ||
| fill: (u, seriesIdx) => { | ||
| let s = u.series[seriesIdx]; | ||
| let sc = u.scales[s.scale]; | ||
|
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| return scaleGradient(u, s.scale, 1, [ | ||
| [sc.min, "red"], | ||
| [ 0, "white"], | ||
| [sc.max, "green"], | ||
| ]); | ||
| }, | ||
| stroke: (u, seriesIdx) => { | ||
| let s = u.series[seriesIdx]; | ||
| let sc = u.scales[s.scale]; | ||
|
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| return scaleGradient(u, s.scale, 1, [ | ||
| [sc.min, "red"], | ||
| [ 0, "green"], | ||
| ], 1, true); | ||
| }, | ||
| }, | ||
| { | ||
| width: 0, | ||
| points: { | ||
| show: false, | ||
| }, | ||
| fill: (u, seriesIdx) => { | ||
| let s = u.series[seriesIdx]; | ||
| let sc = u.scales[s.scale]; | ||
|
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| return scaleGradient(u, s.scale, 1, [ | ||
| [sc.min, "red"], | ||
| [ 0, "green"], | ||
| ], 1, true); | ||
| }, | ||
| paths: uPlot.paths.bars({ | ||
| disp: { | ||
| // bar lows | ||
| y0: { | ||
| unit: 1, | ||
| values: (u, seriesIdx) => u.data[2], | ||
| }, | ||
| // bar highs | ||
| y1: { | ||
| unit: 1, | ||
| values: (u, seriesIdx) => u.data[3], | ||
| }, | ||
| } | ||
| }) | ||
| } | ||
| ], | ||
| }; | ||
|
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| let u = new uPlot(opts, data, document.body); | ||
|
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| // with explicit bar colors | ||
| let opts2 = uPlot.assign({}, opts); | ||
| opts2.series[2].fill = null; | ||
| opts2.series[2].paths = uPlot.paths.bars({ | ||
| disp: { | ||
| // bar lows | ||
| y0: { | ||
| unit: 1, | ||
| values: (u, seriesIdx) => u.data[2], | ||
| }, | ||
| // bar highs | ||
| y1: { | ||
| unit: 1, | ||
| values: (u, seriesIdx) => u.data[3], | ||
| }, | ||
| fill: { | ||
| unit: 3, | ||
| values: (u, seriesIdx) => u.data[2].map((v, i) => { | ||
| return v < 0 || u.data[3][i] < 0 ? "red" : "green"; | ||
| }) | ||
| } | ||
| } | ||
| }); | ||
|
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| let u2 = new uPlot(opts2, data, document.body); | ||
| </script> | ||
| </body> | ||
| </html> |
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