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import type { Schema } from 'jtd';
/**
* Style of a GeoJSON feature, stored in the feature properties.
* Every property is optional, and a missing property uses the default.
*/
export interface GeoStyle {
/** Stroke color, also used for points. */
color?: string;
strokeWidth?: GeoStrokeWidth;
strokeStyle?: GeoStrokeStyle;
/** Fill color, defaults to the stroke color. */
fillColor?: string;
fillStyle?: GeoFillStyle;
}
export const GEO_STROKE_WIDTHS = ['small', 'medium', 'large'] as const;
export type GeoStrokeWidth = typeof GEO_STROKE_WIDTHS[number];
export const GEO_STROKE_STYLES = ['solid', 'dashed', 'dotted', 'blinking'] as const;
export type GeoStrokeStyle = typeof GEO_STROKE_STYLES[number];
export const GEO_FILL_STYLES = ['default', 'none', 'solid', 'ne', 'nw', 'crosshatch', 'blinking'] as const;
export type GeoFillStyle = typeof GEO_FILL_STYLES[number];
/**
* JTD schema for the style feature properties. Other properties are allowed.
*/
export const geoStyleSchema: Schema = {
optionalProperties: {
color: { type: 'string' },
strokeWidth: { enum: [...GEO_STROKE_WIDTHS] },
strokeStyle: { enum: [...GEO_STROKE_STYLES] },
fillColor: { type: 'string' },
fillStyle: { enum: [...GEO_FILL_STYLES] },
},
additionalProperties: true,
};
export const GEO_DEFAULT_COLOR = '#4264fb';
/**
* MapLibre paint color using the feature's color property, if valid.
*/
export const GEO_COLOR: any = ['to-color', ['get', 'color'], GEO_DEFAULT_COLOR];
/**
* MapLibre paint fill color using the feature's fill color, or the stroke color.
*/
export const GEO_FILL_COLOR: any = ['to-color', ['get', 'fillColor'], ['get', 'color'], GEO_DEFAULT_COLOR];
/** Opacity of the default fill style. */
export const GEO_FILL_OPACITY = 0.3;
const STROKE_WIDTH: any = ['match', ['get', 'strokeWidth'], 'small', 1, 'large', 4, 2];
const POINT_SCALE: any = ['match', ['get', 'strokeWidth'], 'small', 0.6, 'large', 1.5, 1];
const DASHES: any = ['match', ['get', 'strokeStyle'], 'dotted', ['literal', [0, 2]], ['literal', [4, 2]]];
const PATTERN_STYLES = ['ne', 'nw', 'crosshatch'];
const PATTERN_PREFIX = 'geo-pattern-';
const pattern = (style: any, color: any): any => ['concat', PATTERN_PREFIX, style, '|', ['to-string', color]];
const BLINK_MS = 500;
/** Radius of the blinking point image, in CSS pixels. */
const BLINK_POINT_RADIUS = 16;
const POLYGONS: any = ['match', ['geometry-type'], ['Polygon', 'MultiPolygon'], true, false];
const LINES: any = ['match', ['geometry-type'], ['LineString', 'MultiLineString', 'Polygon', 'MultiPolygon'], true, false];
const POINTS: any = ['match', ['geometry-type'], ['Point', 'MultiPoint'], true, false];
const fillStyle = (...styles: string[]): any => ['match', ['get', 'fillStyle'], styles, true, false];
const strokeStyle = (...styles: string[]): any => ['match', ['get', 'strokeStyle'], styles, true, false];
/**
* Add layers drawing the features of a GeoJSON source with their style
* properties. Layer ids start with the prefix.
* Hatched and blinking styles use pattern images generated for each color
* when first needed. Blinking images are animated, and only repaint the map
* while they are drawn, so call this outside the Angular zone.
* Returns a function removing the pattern image resolver and blink repaints.
*/
export function addGeoLayers(map: MapLibreMap, source: string, prefix: string, pointRadius: number): () => void {
const blink = new BlinkClock(map);
map.setMissingStyleImageResolver(id => {
if (!id.startsWith(PATTERN_PREFIX) || map.hasImage(id)) return;
const [style, color] = id.substring(PATTERN_PREFIX.length).split('|');
const image = style.startsWith('blink-')
? blinkImage(style, color, blink)
: geoPattern(style, color);
Iif (image) map.addImage(id, image, { pixelRatio: PATTERN_PIXEL_RATIO });
});
map.addLayer({
id: prefix + '-fill',
type: 'fill',
source,
filter: ['all', POLYGONS, ['!', fillStyle('none', 'blinking', ...PATTERN_STYLES)]],
paint: {
'fill-color': GEO_FILL_COLOR,
'fill-opacity': ['match', ['get', 'fillStyle'], 'solid', 1, GEO_FILL_OPACITY],
},
});
map.addLayer({
id: prefix + '-fill-pattern',
type: 'fill',
source,
filter: ['all', POLYGONS, fillStyle(...PATTERN_STYLES, 'blinking')],
paint: {
'fill-pattern': pattern(['match', ['get', 'fillStyle'], 'blinking', 'blink-fill', ['get', 'fillStyle']], GEO_FILL_COLOR),
},
});
map.addLayer({
id: prefix + '-lines',
type: 'line',
source,
filter: ['all', LINES, ['!', strokeStyle('dashed', 'dotted', 'blinking')]],
paint: { 'line-color': GEO_COLOR, 'line-width': STROKE_WIDTH },
});
map.addLayer({
id: prefix + '-lines-dashed',
type: 'line',
source,
filter: ['all', LINES, strokeStyle('dashed', 'dotted')],
layout: { 'line-cap': 'round' },
paint: { 'line-color': GEO_COLOR, 'line-width': STROKE_WIDTH, 'line-dasharray': DASHES },
});
map.addLayer({
id: prefix + '-lines-blink',
type: 'line',
source,
filter: ['all', LINES, strokeStyle('blinking')],
paint: { 'line-pattern': pattern('blink-line', GEO_COLOR), 'line-width': STROKE_WIDTH },
});
map.addLayer({
id: prefix + '-points',
type: 'circle',
source,
filter: ['all', POINTS, ['!', strokeStyle('blinking')]],
paint: { 'circle-radius': ['*', pointRadius, POINT_SCALE], 'circle-color': GEO_COLOR },
});
map.addLayer({
id: prefix + '-points-blink',
type: 'symbol',
source,
filter: ['all', POINTS, strokeStyle('blinking')],
layout: {
'icon-image': pattern('blink-point', GEO_COLOR),
'icon-size': ['*', pointRadius / BLINK_POINT_RADIUS, POINT_SCALE],
'icon-allow-overlap': true,
'icon-ignore-placement': true,
},
});
return () => {
blink.dispose();
try {
map.setMissingStyleImageResolver(null);
} catch {
// Map removed
}
};
}
/**
* Shared blink phase, so every blinking feature blinks together. Repaints the
* map once at the next phase change, only when a blinking image was drawn.
*/
export class BlinkClock {
private timeout?: ReturnType<typeof setTimeout>;
private disposed = false;
constructor(private map: Pick<MapLibreMap, 'triggerRepaint'>) { }
get on() {
return Math.floor(performance.now() / BLINK_MS) % 2 === 0;
}
/**
* Called each frame a blinking image is drawn.
*/
drawn() {
if (this.disposed || this.timeout) return;
const wait = BLINK_MS - performance.now() % BLINK_MS + 1;
this.timeout = setTimeout(() => {
this.timeout = undefined;
Eif (!this.disposed) this.map.triggerRepaint();
}, wait);
}
dispose() {
this.disposed = true;
clearTimeout(this.timeout);
this.timeout = undefined;
}
}
/**
* Animated pattern image for a blinking fill, line or point. Swaps between an
* on and off frame, only uploading a frame when the blink phase changes.
*/
export function blinkImage(style: string, color: string, clock: BlinkClock): StyleImageInterface | undefined {
const on = blinkFrame(style, color, true);
const off = blinkFrame(style, color, false);
if (!on || !off) return undefined;
let shown = true;
const data = new Uint8Array(on.data.buffer.slice(0));
return {
width: on.width,
height: on.height,
data,
render() {
clock.drawn();
const next = clock.on;
if (next === shown) return false;
shown = next;
data.set((next ? on : off).data);
return true;
},
};
}
function blinkFrame(style: string, color: string, on: boolean): ImageData | undefined {
const point = style === 'blink-point';
const s = (point ? BLINK_POINT_RADIUS * 2 : 4) * PATTERN_PIXEL_RATIO;
const canvas = document.createElement('canvas');
canvas.width = canvas.height = s;
const ctx = canvas.getContext('2d');
if (!ctx) return undefined;
ctx.fillStyle = color;
switch (style) {
case 'blink-fill':
ctx.globalAlpha = on ? GEO_FILL_OPACITY * 2 : 0;
ctx.fillRect(0, 0, s, s);
break;
case 'blink-line':
ctx.globalAlpha = on ? 1 : 0.2;
ctx.fillRect(0, 0, s, s);
break;
case 'blink-point':
ctx.globalAlpha = on ? 1 : 0.2;
ctx.beginPath();
ctx.arc(s / 2, s / 2, s / 2 - 1, 0, Math.PI * 2);
ctx.fill();
break;
default:
return undefined;
}
return ctx.getImageData(0, 0, s, s);
}
const PATTERN_SIZE = 12;
const PATTERN_PIXEL_RATIO = 2;
/**
* Hatch pattern image for a fill style and color.
*/
export function geoPattern(style: string, color: string): ImageData | undefined {
Eif (!PATTERN_STYLES.includes(style)) return undefined;
const s = PATTERN_SIZE * PATTERN_PIXEL_RATIO;
const canvas = document.createElement('canvas');
canvas.width = canvas.height = s;
const ctx = canvas.getContext('2d');
if (!ctx) return undefined;
ctx.strokeStyle = color;
ctx.lineWidth = PATTERN_PIXEL_RATIO * 1.5;
ctx.beginPath();
// Draw each diagonal three times so the pattern tiles seamlessly
for (const k of [-s, 0, s]) {
if (style !== 'nw') {
ctx.moveTo(k, s);
ctx.lineTo(k + s, 0);
}
if (style !== 'ne') {
ctx.moveTo(k, 0);
ctx.lineTo(k + s, s);
}
}
ctx.stroke();
return ctx.getImageData(0, 0, s, s);
}
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