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h3-hexagon-layer.ts
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// Copyright (c) 2023 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
import Layer, {
LayerBaseConfig,
LayerBaseConfigPartial,
LayerColorConfig,
LayerColumn,
LayerCoverageConfig,
LayerSizeConfig
} from '../base-layer';
import {BrushingExtension} from '@deck.gl/extensions';
import {GeoJsonLayer} from '@deck.gl/layers';
import {H3HexagonLayer} from '@deck.gl/geo-layers';
import {EnhancedColumnLayer} from '@kepler.gl/deckgl-layers';
import {
getCentroid,
idToPolygonGeo,
h3IsValid,
getHexFields,
Centroid,
findDefaultColorField,
DataContainerInterface,
createDataContainer
} from '@kepler.gl/utils';
import H3HexagonLayerIcon from './h3-hexagon-layer-icon';
import {CHANNEL_SCALES, HIGHLIGH_COLOR_3D, ColorRange} from '@kepler.gl/constants';
import {
VisConfigBoolean,
VisConfigColorRange,
VisConfigNumber,
VisConfigRange,
Merge
} from '@kepler.gl/types';
import {KeplerTable} from '@kepler.gl/table';
import {getTextOffsetByRadius, formatTextLabelData} from '../layer-text-label';
export type HexagonIdLayerColumnsConfig = {
hex_id: LayerColumn;
};
export type HexagonIdLayerVisConfigSettings = {
opacity: VisConfigNumber;
colorRange: VisConfigColorRange;
coverage: VisConfigNumber;
enable3d: VisConfigBoolean;
sizeRange: VisConfigRange;
coverageRange: VisConfigRange;
elevationScale: VisConfigNumber;
enableElevationZoomFactor: VisConfigBoolean;
};
export type HexagonIdLayerVisConfig = {
opacity: number;
colorRange: ColorRange;
coverage: number;
enable3d: boolean;
sizeRange: [number, number];
coverageRange: [number, number];
elevationScale: number;
enableElevationZoomFactor: boolean;
};
export type HexagonIdLayerVisualChannelConfig = LayerColorConfig &
LayerSizeConfig &
LayerCoverageConfig;
export type HexagonIdLayerConfig = Merge<
LayerBaseConfig,
{columns: HexagonIdLayerColumnsConfig; visConfig: HexagonIdLayerVisConfig}
> &
HexagonIdLayerVisualChannelConfig;
export type HexagonIdLayerData = {index: number; id; centroid: Centroid};
const DEFAULT_LINE_SCALE_VALUE = 8;
export const hexIdRequiredColumns: ['hex_id'] = ['hex_id'];
export const hexIdAccessor = ({hex_id}: HexagonIdLayerColumnsConfig) => (
dc: DataContainerInterface
) => d => dc.valueAt(d.index, hex_id.fieldIdx);
export const defaultElevation = 500;
export const defaultCoverage = 1;
export const HexagonIdVisConfigs: {
opacity: 'opacity';
colorRange: 'colorRange';
coverage: 'coverage';
enable3d: 'enable3d';
sizeRange: 'elevationRange';
coverageRange: 'coverageRange';
elevationScale: 'elevationScale';
enableElevationZoomFactor: 'enableElevationZoomFactor';
} = {
opacity: 'opacity',
colorRange: 'colorRange',
coverage: 'coverage',
enable3d: 'enable3d',
sizeRange: 'elevationRange',
coverageRange: 'coverageRange',
elevationScale: 'elevationScale',
enableElevationZoomFactor: 'enableElevationZoomFactor'
};
const brushingExtension = new BrushingExtension();
export default class HexagonIdLayer extends Layer {
dataToFeature: {centroids: Centroid[]};
declare config: HexagonIdLayerConfig;
declare visConfigSettings: HexagonIdLayerVisConfigSettings;
constructor(props) {
super(props);
this.dataToFeature = {centroids: []};
this.registerVisConfig(HexagonIdVisConfigs);
this.getPositionAccessor = (dataContainer: DataContainerInterface) =>
hexIdAccessor(this.config.columns)(dataContainer);
}
get type(): 'hexagonId' {
return 'hexagonId';
}
get name(): 'H3' {
return 'H3';
}
get requiredLayerColumns() {
return hexIdRequiredColumns;
}
get layerIcon() {
// use hexagon layer icon for now
return H3HexagonLayerIcon;
}
get visualChannels() {
const visualChannels = super.visualChannels;
return {
color: {
...visualChannels.color,
accessor: 'getFillColor'
},
size: {
...visualChannels.size,
property: 'height',
accessor: 'getElevation',
nullValue: 0,
condition: config => config.visConfig.enable3d,
defaultValue: defaultElevation
},
coverage: {
property: 'coverage',
field: 'coverageField',
scale: 'coverageScale',
domain: 'coverageDomain',
range: 'coverageRange',
key: 'coverage',
channelScaleType: CHANNEL_SCALES.radius,
accessor: 'getCoverage',
nullValue: 0,
defaultValue: defaultCoverage
}
};
}
setInitialLayerConfig(dataset) {
if (!dataset.dataContainer.numRows()) {
return this;
}
const defaultColorField = findDefaultColorField(dataset);
if (defaultColorField) {
this.updateLayerConfig<HexagonIdLayerConfig>({
colorField: defaultColorField
});
this.updateLayerVisualChannel(dataset, 'color');
}
return this;
}
static findDefaultLayerProps({fields = [], dataContainer, label}: KeplerTable) {
const hexFields = getHexFields(fields, dataContainer);
if (!hexFields.length) {
return {props: []};
}
return {
props: hexFields.map(f => ({
isVisible: true,
// default layer name should be dataset name
label,
columns: {
hex_id: {
value: f.name,
fieldIdx: fields.findIndex(fid => fid.name === f.name)
}
}
}))
};
}
getDefaultLayerConfig(props: LayerBaseConfigPartial) {
return {
...super.getDefaultLayerConfig(props),
// add height visual channel
coverageField: null,
coverageDomain: [0, 1],
coverageScale: 'linear'
};
}
calculateDataAttribute({dataContainer, filteredIndex}: KeplerTable, getHexId) {
const data: HexagonIdLayerData[] = [];
for (let i = 0; i < filteredIndex.length; i++) {
const index = filteredIndex[i];
const id = getHexId({index});
const centroid = this.dataToFeature.centroids[index];
if (centroid) {
data.push({
index,
id,
centroid
});
}
}
return data;
}
// TODO: fix complexity
/* eslint-disable complexity */
formatLayerData(datasets, oldLayerData, opt = {}) {
if (this.config.dataId === null) {
return {};
}
const {gpuFilter, dataContainer} = datasets[this.config.dataId];
const getHexId = this.getPositionAccessor(dataContainer);
const {data, triggerChanged} = this.updateData(datasets, oldLayerData);
const accessors = this.getAttributeAccessors({dataContainer});
const {textLabel} = this.config;
// get all distinct characters in the text labels
const textLabels = formatTextLabelData({
textLabel,
triggerChanged,
oldLayerData,
data,
dataContainer
});
return {
data,
getHexId,
getFilterValue: gpuFilter.filterValueAccessor(dataContainer)(),
textLabels,
getPosition: d => d.centroid,
...accessors
};
}
/* eslint-enable complexity */
updateLayerMeta(dataContainer, getHexId) {
const centroids = dataContainer.map((d, index) => {
const id = getHexId({index});
if (!h3IsValid(id)) {
return null;
}
// save a reference of centroids to dataToFeature
// so we don't have to re calculate it again
return getCentroid({id});
}, true);
const centroidsDataContainer = createDataContainer(centroids);
const bounds = this.getPointsBounds(
centroidsDataContainer,
(d: any, dc: DataContainerInterface) => {
return [dc.valueAt(d.index, 0), dc.valueAt(d.index, 1)];
}
);
this.dataToFeature = {centroids};
this.updateMeta({bounds});
}
renderLayer(opts) {
const {data, gpuFilter, objectHovered, mapState, interactionConfig} = opts;
const zoomFactor = this.getZoomFactor(mapState);
const eleZoomFactor = this.getElevationZoomFactor(mapState);
const {config} = this;
const {visConfig} = config;
const updateTriggers = this.getVisualChannelUpdateTriggers();
const h3HexagonLayerTriggers = {
getHexagon: this.config.columns,
getFillColor: updateTriggers.getFillColor,
getElevation: updateTriggers.getElevation,
getFilterValue: gpuFilter.filterValueUpdateTriggers
};
const columnLayerTriggers = {
getCoverage: updateTriggers.getCoverage
};
const defaultLayerProps = this.getDefaultDeckLayerProps(opts);
const hoveredObject = this.hasHoveredObject(objectHovered);
// getPixelOffset with no radius
const radiusScale = 1.0;
const getRaidus = null;
const getPixelOffset = getTextOffsetByRadius(radiusScale, getRaidus, mapState);
const brushingProps = this.getBrushingExtensionProps(interactionConfig);
const extensions = [...defaultLayerProps.extensions, brushingExtension];
const sharedProps = {
getFilterValue: data.getFilterValue,
extensions,
filterRange: defaultLayerProps.filterRange,
visible: defaultLayerProps.visible,
...brushingProps
};
return [
new H3HexagonLayer({
...defaultLayerProps,
...data,
...brushingProps,
extensions,
wrapLongitude: false,
getHexagon: (x: any) => x.id,
// coverage
coverage: config.coverageField ? 1 : visConfig.coverage,
// highlight
autoHighlight: visConfig.enable3d,
highlightColor: HIGHLIGH_COLOR_3D,
// elevation
extruded: visConfig.enable3d,
elevationScale: visConfig.elevationScale * eleZoomFactor,
// render
updateTriggers: h3HexagonLayerTriggers,
_subLayerProps: {
'hexagon-cell': {
type: EnhancedColumnLayer,
getCoverage: data.getCoverage,
updateTriggers: columnLayerTriggers
}
}
}),
// hover layer
...(hoveredObject && !config.sizeField
? [
new GeoJsonLayer({
...this.getDefaultHoverLayerProps(),
visible: defaultLayerProps.visible,
data: [idToPolygonGeo(hoveredObject)],
getLineColor: config.highlightColor,
lineWidthScale: DEFAULT_LINE_SCALE_VALUE * zoomFactor,
wrapLongitude: false
})
]
: []),
// text label layer
...this.renderTextLabelLayer(
{
getPosition: data.getPosition,
sharedProps,
getPixelOffset,
updateTriggers
},
opts
)
];
}
}