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index.js
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index.js
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import Style from "ol/style/Style.js"
import Fill from "ol/style/Fill.js"
import Stroke from "ol/style/Stroke.js"
import Text from "ol/style/Text.js"
import Icon from "ol/style/Icon.js"
import RegularShape from "ol/style/RegularShape.js"
import CircleStyle from "ol/style/Circle.js"
/**
* @typedef StyleLike
* @type {object}
* @property {FillLike} fill
* @property {StrokeLike} stroke
* @property {TextLike} text
* @property {IconLike | CircleStyleLike | RegularShapeLike} image
*/
/**
* @typedef FillLike
* @type {object}
* @property {string} color
*/
/**
* @typedef StrokeLike
* @type {object}
* @property {string} color
* @property {'butt'|'round'|'square'} lineCap
* @property {'bevel'|'round'|'miter'} lineJoin
* @property {number[]} lineDash
* @property {number} lineDashOffset
* @property {number} miterLimit
* @property {number} width
*/
/**
* @typedef TextLike
* @type {object}
* @property {FillLike} backgroundFill
* @property {StrokeLike} backgroundStroke
* @property {FillLike} fill
* @property {StrokeLike} stroke
* @property {string} font
* @property {number} maxAngle
* @property {number} offsetX
* @property {number} offsetY
* @property {boolean} overflow
* @property {'point'|'line'} placement
* @property {number} scale
* @property {number} rotation
* @property {boolean} rotateWithView
* @property {string} text
* @property {string} textAlign
* @property {string} textBaseline
* @property {string} justify
* @property {number[]} padding
*/
/**
* @typedef IconLike
* @type {object}
* @property {[number,number]} anchor
* @property {string} color
* @property {[number,number]} displacement
* @property {number} opacity
* @property {number} scale
* @property {number} rotation
* @property {boolean} rotateWithView
* @property {[width:number, height:number]} size
* @property {string} src
* @property {'declutter'|'obstacle'|'none'|undefined} declutterMode
* @property {'Icon'} _type
*/
/**
* @typedef RegularShapeLike
* @type {object}
* @property {FillLike} fill
* @property {StrokeLike} stroke
* @property {number} points
* @property {number} radius
* @property {number} radius2
* @property {number} angle
* @property {[number,number]} displacement
* @property {number} rotation
* @property {boolean} rotateWithView
* @property {number} scale
* @property {'declutter'|'obstacle'|'none'|undefined} declutterMode
* @property {'RegularShape'} _type
*/
/**
* @typedef CircleStyleLike
* @type {object}
* @property {FillLike} fill
* @property {StrokeLike} stroke
* @property {number} radius
* @property {[number,number]} displacement
* @property {number} scale
* @property {number} rotation
* @property {boolean} rotateWithView
* @property {'declutter'|'obstacle'|'none'|undefined} declutterMode
* @property {'CircleStyle'} _type
*/
/**
* Mark the _type on IconLike|RegularShapeLike|CircleStyleLike object
* to identify the class when deserializing.
*/
const IMAGE_TYPE_ENUM = {
Icon: 'Icon',
CircleStyle: 'CircleStyle',
RegularShape: 'RegularShape'
}
/**
* serialize ol.style.Fill instance into FillLike object.
* @param olFill {Fill}
* @return {FillLike}
*/
export function serializeFill(olFill) {
if (olFill instanceof Fill) {
if (olFill.getColor()) {
return {
color: olFill.getColor()
}
}
}
}
/**
* construct ol.style.Fill instance use FillLike object.
* @param fillLike {FillLike}
* @return {Fill}
*/
export function constructFill(fillLike) {
if (fillLike?.color) return tryConstruct(Fill, fillLike)
}
/**
* serialize ol.style.Stroke instance into StrokeLike object.
* @param olStroke {Stroke}
* @return {StrokeLike}
*/
export function serializeStroke(olStroke) {
if (olStroke instanceof Stroke) {
return trimEmptyProperty({
color: olStroke.getColor(),
lineCap: olStroke.getLineCap(),
lineDash: olStroke.getLineDash(),
lineDashOffset: olStroke.getLineDashOffset(),
lineJoin: olStroke.getLineJoin(),
miterLimit: olStroke.getMiterLimit(),
width: olStroke.getWidth()
})
}
}
/**
* construct ol.style.Stroke instance use StrokeLike object.
* @param strokeLike {StrokeLike}
* @return {Stroke}
*/
export function constructStroke(strokeLike) {
if (strokeLike) return tryConstruct(Stroke, strokeLike)
}
/**
* serialize ol.style.Text instance into TextLike object.
* @param olText {Text}
* @return {TextLike}
*/
export function serializeText(olText) {
if (olText instanceof Text) {
return trimEmptyProperty({
backgroundFill: serializeFill(olText.getBackgroundFill()),
backgroundStroke: serializeStroke(olText.getBackgroundStroke()),
fill: serializeFill(olText.getFill()),
stroke: serializeStroke(olText.getStroke()),
font: olText.getFont(),
maxAngle: olText.getMaxAngle(),
offsetX: olText.getOffsetX(),
offsetY: olText.getOffsetY(),
overflow: olText.getOverflow(),
placement: olText.getPlacement(),
scale: olText.getScale(),
rotation: olText.getRotation(),
rotateWithView: olText.getRotateWithView(),
text: olText.getText(),
textAlign: olText.getTextAlign(),
textBaseline: olText.getTextBaseline(),
justify: olText.getJustify(),
padding: olText.getPadding()
})
}
}
/**
* construct ol.style.Text instance use TextLike object.
* @param textLike {TextLike}
* @return {Text}
*/
export function constructText(textLike) {
if (!textLike) return undefined
const {
backgroundFill,
backgroundStroke,
fill,
stroke,
...props
} = textLike
return tryConstruct(Text, {
...props,
backgroundFill: constructFill(backgroundFill),
backgroundStroke: constructStroke(backgroundStroke),
fill: constructFill(fill),
stroke: constructStroke(stroke)
})
}
/**
* serialize ol.style.Icon instance into IconLike object.
* @param olIcon {Icon}
* @return {IconLike}
*/
export function serializeIcon(olIcon) {
if (olIcon instanceof Icon) {
if (!olIcon.getSrc()) return undefined
return trimEmptyProperty({
_type: IMAGE_TYPE_ENUM.Icon,
anchor: olIcon.getAnchor(),
color: olIcon.getColor(),
displacement: olIcon.getDisplacement(),
opacity: olIcon.getOpacity(),
scale: olIcon.getScale(),
rotateWithView: olIcon.getRotateWithView(),
rotation: olIcon.getRotation(),
size: olIcon.getSize(),
src: olIcon.getSrc(),
declutterMode: olIcon.getDeclutterMode()
})
}
}
/**
* construct ol.style.Icon instance use IconLike object.
* @param iconLike {IconLike}
* @return {Icon}
*/
export function constructIcon(iconLike) {
if (!iconLike) return undefined
if (!iconLike.src) return undefined
return tryConstruct(Icon, iconLike)
}
/**
* serialize ol.style.RegularShape instance into RegularShapeLike object.
* @param regularShape {RegularShape}
* @return {RegularShapeLike}
*/
export function serialRegularShape(regularShape) {
if (regularShape instanceof RegularShape) {
return trimEmptyProperty({
_type: IMAGE_TYPE_ENUM.RegularShape,
//
fill: serializeFill(regularShape.getFill()),
stroke: serializeStroke(regularShape.getStroke()),
//
points: regularShape.getPoints(),
radius: regularShape.getRadius(),
radius2: regularShape.getRadius2(),
angle: regularShape.getAngle(),
displacement: regularShape.getDisplacement(),
rotation: regularShape.getRotation(),
rotateWithView: regularShape.getRotateWithView(),
scale: regularShape.getScale(),
declutterMode: regularShape.getDeclutterMode()
})
}
}
/**
* construct ol.style.RegularShape instance use RegularShapeLike object.
* @param regularShapeLike {RegularShapeLike}
* @return {RegularShape}
*/
export function constructRegularShape(regularShapeLike) {
if (!regularShapeLike) return undefined
const { fill, stroke, ...props } = regularShapeLike
return tryConstruct(RegularShape, {
...props,
fill: constructFill(fill),
stroke: constructStroke(stroke)
})
}
/**
* serialize ol.style.CircleStyle instance into CircleStyleLike object.
* @param circleStyle {CircleStyle}
* @return {CircleStyleLike}
*/
export function serialCircleShape(circleStyle) {
if (circleStyle instanceof CircleStyle) {
return trimEmptyProperty({
_type: IMAGE_TYPE_ENUM.CircleStyle,
//
fill: serializeFill(circleStyle.getFill()),
stroke: serializeStroke(circleStyle.getStroke()),
//
radius: circleStyle.getRadius(),
displacement: circleStyle.getDisplacement(),
scale: circleStyle.getScale(),
rotation: circleStyle.getRotation(),
rotateWithView: circleStyle.getRotateWithView(),
declutterMode: circleStyle.getDeclutterMode()
})
}
}
/**
* construct ol.style.CircleStyle instance use CircleStyleLike object.
* @param circleStyleLike {CircleStyleLike}
* @return {CircleStyle}
*/
export function constructCircleStyle(circleStyleLike) {
if (!circleStyleLike) return undefined
const { fill, stroke, ...props } = circleStyleLike
return tryConstruct(CircleStyle, {
...props,
fill: constructFill(fill),
stroke: constructStroke(stroke)
})
}
/**
* serialize ol.style.Image sub class instance into ImageLike object.
* CircleStyle is RegularShape's sub class, handle CircleStyle first.
* @param olImage {Icon|RegularShape|CircleStyle}
* @return {IconLike|RegularShapeLike|CircleStyleLike}
*/
export function serializeImage(olImage) {
if (olImage instanceof Icon) {
return serializeIcon(olImage)
}
if (olImage instanceof CircleStyle) {
return serialCircleShape(olImage)
}
if (olImage instanceof RegularShape) {
return serialRegularShape(olImage)
}
}
/**
* construct ol.style.Image sub class instance use ImageLike object.
* @param imageLike {IconLike|RegularShapeLike|CircleStyleLike}
* @return {Icon|RegularShape|CircleStyle}
*/
export function constructImage(imageLike) {
if (!imageLike) return undefined
switch (imageLike._type) {
case IMAGE_TYPE_ENUM.Icon:
return constructIcon(imageLike)
case IMAGE_TYPE_ENUM.CircleStyle:
return constructCircleStyle(imageLike)
case IMAGE_TYPE_ENUM.RegularShape:
return constructRegularShape(imageLike)
default:
return constructIcon(imageLike)
}
}
/**
* serialize ol.style.Style instance into StyleLike object.
* @param olStyle {Style}
* @return {StyleLike}
*/
export function serializeStyle(olStyle) {
if (olStyle instanceof Style) {
return trimEmptyProperty({
image: serializeImage(olStyle.getImage()),
fill: serializeFill(olStyle.getFill()),
stroke: serializeStroke(olStyle.getStroke()),
text: serializeText(olStyle.getText())
})
}
}
/**
* construct ol.style.Style instance use StyleLike object.
* return undefined on construction failure.
* @param styleLike {StyleLike}
* @return {Style}
*/
export function constructStyle(styleLike) {
if (!styleLike) return undefined
const { image, fill, stroke, text } = styleLike
return tryConstruct(Style, {
fill: constructFill(fill),
stroke: constructStroke(stroke),
text: constructText(text),
image: constructImage(image),
})
}
/**
* remove the null/undefined-valued 1 depth property from an object.
*/
function trimEmptyProperty(obj) {
return obj && Object.keys(obj)
.filter((key) => obj[key] !== null && obj[key] !== undefined)
.reduce((acc, key) => ({ ...acc, [key]: obj[key] }), {})
}
/**
* ignore the error and return undefined when construct failed.
*/
function tryConstruct(constructor, options) {
try {
return options ? new constructor(trimEmptyProperty(options)) : new constructor()
} catch (e) {
}
}