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layer-text-label.js
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layer-text-label.js
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// Copyright (c) 2020 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 {getDistanceScales} from 'viewport-mercator-project';
import {notNullorUndefined} from 'utils/data-utils';
import uniq from 'lodash.uniq';
export const defaultPadding = 20;
export function getTextOffsetByRadius(radiusScale, getRadius, mapState) {
return textLabel => {
const distanceScale = getDistanceScales(mapState);
const xMult = textLabel.anchor === 'middle' ? 0 : textLabel.anchor === 'start' ? 1 : -1;
const yMult = textLabel.alignment === 'center' ? 0 : textLabel.alignment === 'bottom' ? 1 : -1;
const sizeOffset =
textLabel.alignment === 'center'
? 0
: textLabel.alignment === 'bottom'
? textLabel.size
: textLabel.size;
const pixelRadius = radiusScale * distanceScale.pixelsPerMeter[0];
const padding = defaultPadding;
return typeof getRadius === 'function'
? d => [
xMult * (getRadius(d) * pixelRadius + padding),
yMult * (getRadius(d) * pixelRadius + padding + sizeOffset)
]
: [
xMult * (getRadius * pixelRadius + padding),
yMult * (getRadius * pixelRadius + padding + sizeOffset)
];
};
}
export const textLabelAccessor = textLabel => d => {
const val = d.data[textLabel.field.tableFieldIndex - 1];
return notNullorUndefined(val) ? String(val) : '';
};
export const formatTextLabelData = ({textLabel, triggerChanged, oldLayerData, data}) => {
return textLabel.map((tl, i) => {
if (!tl.field) {
// if no field selected,
return {
getText: null,
characterSet: []
};
}
const getText = textLabelAccessor(tl);
let characterSet;
if (
!triggerChanged[`getLabelCharacterSet-${i}`] &&
oldLayerData &&
oldLayerData.textLabels &&
oldLayerData.textLabels[i]
) {
characterSet = oldLayerData.textLabels[i].characterSet;
} else {
const allLabels = tl.field ? data.map(getText) : [];
characterSet = uniq(allLabels.join(''));
}
return {
characterSet,
getText
};
});
};