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Merge pull request #843 from CodeForAfrica/ft/hurumap-choropleth-map
Choropleth Map
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| import { Typography, Grid } from "@mui/material"; | ||
|
|
||
| export default function Legend({ legend, title = "Average Temperature", sx }) { | ||
| return ( | ||
| <Grid | ||
| spacing={2} | ||
| sx={(theme) => ({ | ||
| position: "absolute", | ||
| zIndex: 1000, | ||
| width: "fit-content", | ||
| bottom: theme.spacing(30), | ||
| right: theme.spacing(20), | ||
| backgroundColor: theme.palette.background.paper, | ||
| padding: theme.spacing(1), | ||
| boxShadow: theme.shadows[3], | ||
| ...sx, | ||
| })} | ||
| > | ||
| <Typography | ||
| variant="subtitle2" | ||
| sx={(theme) => ({ | ||
| color: theme.palette.text.primary, | ||
| marginBottom: theme.spacing(2), | ||
| })} | ||
| > | ||
| {title} | ||
| </Typography> | ||
| {legend?.map(({ min, max, color }) => ( | ||
| <Grid | ||
| container | ||
| key={`${min}-${max}`} | ||
| alignItems="center" | ||
| spacing={1} | ||
| sx={(theme) => ({ | ||
| padding: theme.spacing(1), | ||
| })} | ||
| > | ||
| <Grid | ||
| item | ||
| sx={(theme) => ({ | ||
| backgroundColor: color, | ||
| width: theme.spacing(4), | ||
| height: theme.spacing(4), | ||
| })} | ||
| /> | ||
| <Grid item xs> | ||
| <Typography | ||
| variant="subtitle1" | ||
| sx={(theme) => ({ color: theme.palette.text.primary })} | ||
| > | ||
| {min} - {max} | ||
| </Typography> | ||
| </Grid> | ||
| </Grid> | ||
| ))} | ||
| </Grid> | ||
| ); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| /* eslint-disable import/prefer-default-export */ | ||
|
|
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| import { defaultChoroplethStyles } from "./geoStyles"; | ||
|
|
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| const roundToNearestHalf = (num) => { | ||
| return Math.round(num * 2) / 2; | ||
| }; | ||
|
|
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| const calculateThresholds = (min, max, steps) => { | ||
| const stepSize = (max - min) / steps; | ||
| const thresholds = []; | ||
|
|
||
| for (let i = 0; i < steps; i += 1) { | ||
| thresholds.push({ | ||
| min: roundToNearestHalf(min + i * stepSize), | ||
| max: roundToNearestHalf(min + (i + 1) * stepSize), | ||
| }); | ||
| } | ||
|
|
||
| return thresholds; | ||
| }; | ||
|
|
||
| const generateLegend = ( | ||
| min, | ||
| max, | ||
| positiveThresholds, | ||
| positiveColorRange, | ||
| negativeThresholds, | ||
| negativeColorRange, | ||
| zeroColor, | ||
| ) => { | ||
| const legend = []; | ||
|
|
||
| if (negativeThresholds.length) { | ||
| negativeThresholds.forEach((threshold, index) => { | ||
| legend.push({ | ||
| min: threshold.min, | ||
| max: threshold.max, | ||
| color: negativeColorRange[index], | ||
| }); | ||
| }); | ||
| } | ||
|
|
||
| if (min <= 0 && max >= 0) { | ||
| legend.push({ | ||
| min: 0, | ||
| max: 0, | ||
| color: zeroColor, | ||
| }); | ||
| } | ||
|
|
||
| if (positiveThresholds.length) { | ||
| positiveThresholds.forEach((threshold, index) => { | ||
| legend.push({ | ||
| min: threshold.min, | ||
| max: threshold.max, | ||
| color: positiveColorRange[index], | ||
| }); | ||
| }); | ||
| } | ||
|
|
||
| return legend; | ||
| }; | ||
|
|
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| export const generateChoropleth = (colors, locations, mapType) => { | ||
| if (mapType !== "choropleth") return null; | ||
|
|
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| const filteredLocations = locations.filter(({ count }) => count !== null); | ||
| const counts = filteredLocations.map(({ count }) => count); | ||
| const hasNegativeValues = counts.some((count) => count < 0); | ||
| const hasPositiveValues = counts.some((count) => count > 0); | ||
| const maxCount = Math.max(...counts); | ||
| const minCount = Math.min(...counts); | ||
| const roundedMinCount = Math.floor(minCount); | ||
| const roundedMaxCount = Math.ceil(maxCount); | ||
|
|
||
| const negativeColorRange = | ||
| colors?.negative_color_range || | ||
| defaultChoroplethStyles.negative_color_range; | ||
| const positiveColorRange = | ||
| colors?.positive_color_range || | ||
| defaultChoroplethStyles.positive_color_range; | ||
| const zeroColor = colors?.zero_color || defaultChoroplethStyles.zero_color; | ||
| const opacity = colors?.opacity || defaultChoroplethStyles.opacity; | ||
|
|
||
| const positiveThresholds = hasPositiveValues | ||
| ? calculateThresholds( | ||
| roundedMinCount, | ||
| roundedMaxCount, | ||
| positiveColorRange.length, | ||
| ) | ||
| : []; | ||
| const negativeThresholds = hasNegativeValues | ||
| ? calculateThresholds( | ||
| roundedMinCount, | ||
| roundedMaxCount, | ||
| negativeColorRange.length, | ||
| ) | ||
| : []; | ||
|
|
||
| const legend = generateLegend( | ||
| roundedMinCount, | ||
| roundedMaxCount, | ||
| positiveThresholds, | ||
| positiveColorRange, | ||
| negativeThresholds, | ||
| negativeColorRange, | ||
| zeroColor, | ||
| ); | ||
|
|
||
| const getColor = (count) => { | ||
| if (count === 0) return zeroColor; | ||
| const colorRange = count > 0 ? positiveColorRange : negativeColorRange; | ||
| const thresholds = count > 0 ? positiveThresholds : negativeThresholds; | ||
| const index = thresholds.findIndex( | ||
| (threshold) => count >= threshold.min && count < threshold.max, | ||
| ); | ||
| return colorRange[index]; | ||
| }; | ||
|
|
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| const choroplethData = filteredLocations.map(({ code, count }) => { | ||
| const color = getColor(count); | ||
|
|
||
| return { | ||
| code, | ||
| count, | ||
| fillColor: color, | ||
| opacity, | ||
| }; | ||
| }); | ||
|
|
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| return { choropleth: choroplethData, legend }; | ||
| }; |