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2x 24x | import BoundingRectangle from "../Core/BoundingRectangle.js";
import Cartesian2 from "../Core/Cartesian2.js";
import Cartesian3 from "../Core/Cartesian3.js";
import Color from "../Core/Color.js";
import Frozen from "../Core/Frozen.js";
import defined from "../Core/defined.js";
import DeveloperError from "../Core/DeveloperError.js";
import DistanceDisplayCondition from "../Core/DistanceDisplayCondition.js";
import NearFarScalar from "../Core/NearFarScalar.js";
import Billboard from "./Billboard.js";
import HeightReference from "./HeightReference.js";
import HorizontalOrigin from "./HorizontalOrigin.js";
import LabelStyle from "./LabelStyle.js";
import SDFSettings from "./SDFSettings.js";
import VerticalOrigin from "./VerticalOrigin.js";
const fontInfoCache = {};
let fontInfoCacheLength = 0;
const fontInfoCacheMaxSize = 256;
const defaultBackgroundColor = new Color(0.165, 0.165, 0.165, 0.8);
const defaultBackgroundPadding = new Cartesian2(7, 5);
const textTypes = Object.freeze({
LTR: 0,
RTL: 1,
WEAK: 2,
BRACKETS: 3,
});
function rebindAllGlyphs(label) {
if (!label._rebindAllGlyphs && !label._repositionAllGlyphs) {
// only push label if it's not already been marked dirty
label._labelCollection._labelsToUpdate.push(label);
}
label._rebindAllGlyphs = true;
}
function repositionAllGlyphs(label) {
if (!label._rebindAllGlyphs && !label._repositionAllGlyphs) {
// only push label if it's not already been marked dirty
label._labelCollection._labelsToUpdate.push(label);
}
label._repositionAllGlyphs = true;
}
function getCSSValue(element, property) {
return document.defaultView
.getComputedStyle(element, null)
.getPropertyValue(property);
}
function parseFont(label) {
let fontInfo = fontInfoCache[label._font];
if (!defined(fontInfo)) {
const div = document.createElement("div");
div.style.position = "absolute";
div.style.opacity = 0;
div.style.font = label._font;
document.body.appendChild(div);
let lineHeight = parseFloat(getCSSValue(div, "line-height"));
Eif (isNaN(lineHeight)) {
// line-height isn't a number, i.e. 'normal'; apply default line-spacing
lineHeight = undefined;
}
fontInfo = {
family: getCSSValue(div, "font-family"),
size: getCSSValue(div, "font-size").replace("px", ""),
style: getCSSValue(div, "font-style"),
weight: getCSSValue(div, "font-weight"),
lineHeight: lineHeight,
};
document.body.removeChild(div);
Eif (fontInfoCacheLength < fontInfoCacheMaxSize) {
fontInfoCache[label._font] = fontInfo;
fontInfoCacheLength++;
}
}
label._fontFamily = fontInfo.family;
label._fontSize = fontInfo.size;
label._fontStyle = fontInfo.style;
label._fontWeight = fontInfo.weight;
label._lineHeight = fontInfo.lineHeight;
}
/**
* @typedef {object} Label.ConstructorOptions
*
* Initialization options for the Label constructor
*
* @property {Cartesian3} position The cartesian position of the label.
* @property {*} [id] A user-defined object to return when the label is picked with {@link Scene#pick}.
* @property {boolean} [show=true] Determines if this label will be shown.
* @property {string} [text] A string specifying the text of the label.
* @property {string} [font='30px sans-serif'] A string specifying the font used to draw this label. Fonts are specified using the same syntax as the CSS 'font' property.
* @property {LabelStyle} [style=LabelStyle.FILL] A {@link LabelStyle} specifying the style of the label.
* @property {number} [scale=1.0] A number specifying the uniform scale that is multiplied with the label size.
* @property {boolean} [showBackground=false] Determines if a background behind this label will be shown.
* @property {Color} [backgroundColor=new Color(0.165, 0.165, 0.165, 0.8)] A {@link Color} specifying the background color of the label.
* @property {Cartesian2} [backgroundPadding=new Cartesian2(7, 5)] A {@link Cartesian2} Specifying the horizontal and vertical background padding in pixels.
* @property {Cartesian2} [pixelOffset=Cartesian2.ZERO] A {@link Cartesian2} specifying the pixel offset in screen space from the origin of this label.
* @property {Cartesian3} [eyeOffset=Cartesian3.ZERO] A {@link Cartesian3} specifying the 3D Cartesian offset applied to this label in eye coordinates.
* @property {HorizontalOrigin} [horizontalOrigin=HorizontalOrigin.LEFT] A {@link HorizontalOrigin} specifying the horizontal origin of this label.
* @property {VerticalOrigin} [verticalOrigin=VerticalOrigin.BASELINE] A {@link VerticalOrigin} specifying the vertical origin of this label.
* @property {HeightReference} [heightReference=HeightReference.NONE] A {@link HeightReference} specifying the height reference of this label.
* @property {Color} [fillColor=Color.WHITE] A {@link Color} specifying the fill color of the label.
* @property {Color} [outlineColor=Color.BLACK] A {@link Color} specifying the outline color of the label.
* @property {number} [outlineWidth=1.0] A number specifying the outline width of the label.
* @property {NearFarScalar} [translucencyByDistance] A {@link NearFarScalar} specifying near and far translucency properties of the label based on the label's distance from the camera.
* @property {NearFarScalar} [pixelOffsetScaleByDistance] A {@link NearFarScalar} specifying near and far pixel offset scaling properties of the label based on the label's distance from the camera.
* @property {NearFarScalar} [scaleByDistance] A {@link NearFarScalar} specifying near and far scaling properties of the label based on the label's distance from the camera.
* @property {DistanceDisplayCondition} [distanceDisplayCondition] A {@link DistanceDisplayCondition} specifying at what distance from the camera that this label will be displayed.
* @property {number} [disableDepthTestDistance] A number specifying the distance from the camera at which to disable the depth test to, for example, prevent clipping against terrain.
*/
/**
* <div class="notice">
* Create labels by calling {@link LabelCollection#add}. Do not call the constructor directly.
* </div>
*
* @alias Label
* @internalConstructor
* @class
*
* @param {Label.ConstructorOptions} options Object describing initialization options
* @param {LabelCollection} labelCollection Instance of LabelCollection
*
* @exception {DeveloperError} translucencyByDistance.far must be greater than translucencyByDistance.near
* @exception {DeveloperError} pixelOffsetScaleByDistance.far must be greater than pixelOffsetScaleByDistance.near
* @exception {DeveloperError} distanceDisplayCondition.far must be greater than distanceDisplayCondition.near
*
* @see LabelCollection
* @see LabelCollection#add
*
* @demo {@link https://sandcastle.cesium.com/index.html?src=Labels.html|Cesium Sandcastle Labels Demo}
*/
function Label(options, labelCollection) {
options = options ?? Frozen.EMPTY_OBJECT;
//>>includeStart('debug', pragmas.debug);
if (
defined(options.disableDepthTestDistance) &&
options.disableDepthTestDistance < 0.0
) {
throw new DeveloperError(
"disableDepthTestDistance must be greater than 0.0.",
);
}
//>>includeEnd('debug');
let translucencyByDistance = options.translucencyByDistance;
let pixelOffsetScaleByDistance = options.pixelOffsetScaleByDistance;
let scaleByDistance = options.scaleByDistance;
let distanceDisplayCondition = options.distanceDisplayCondition;
if (defined(translucencyByDistance)) {
//>>includeStart('debug', pragmas.debug);
if (translucencyByDistance.far <= translucencyByDistance.near) {
throw new DeveloperError(
"translucencyByDistance.far must be greater than translucencyByDistance.near.",
);
}
//>>includeEnd('debug');
translucencyByDistance = NearFarScalar.clone(translucencyByDistance);
}
if (defined(pixelOffsetScaleByDistance)) {
//>>includeStart('debug', pragmas.debug);
if (pixelOffsetScaleByDistance.far <= pixelOffsetScaleByDistance.near) {
throw new DeveloperError(
"pixelOffsetScaleByDistance.far must be greater than pixelOffsetScaleByDistance.near.",
);
}
//>>includeEnd('debug');
pixelOffsetScaleByDistance = NearFarScalar.clone(
pixelOffsetScaleByDistance,
);
}
if (defined(scaleByDistance)) {
//>>includeStart('debug', pragmas.debug);
if (scaleByDistance.far <= scaleByDistance.near) {
throw new DeveloperError(
"scaleByDistance.far must be greater than scaleByDistance.near.",
);
}
//>>includeEnd('debug');
scaleByDistance = NearFarScalar.clone(scaleByDistance);
}
if (defined(distanceDisplayCondition)) {
//>>includeStart('debug', pragmas.debug);
if (distanceDisplayCondition.far <= distanceDisplayCondition.near) {
throw new DeveloperError(
"distanceDisplayCondition.far must be greater than distanceDisplayCondition.near.",
);
}
//>>includeEnd('debug');
distanceDisplayCondition = DistanceDisplayCondition.clone(
distanceDisplayCondition,
);
}
this._renderedText = undefined;
this._text = undefined;
this._show = options.show ?? true;
this._font = options.font ?? "30px sans-serif";
this._fillColor = Color.clone(options.fillColor ?? Color.WHITE);
this._outlineColor = Color.clone(options.outlineColor ?? Color.BLACK);
this._outlineWidth = options.outlineWidth ?? 1.0;
this._showBackground = options.showBackground ?? false;
this._backgroundColor = Color.clone(
options.backgroundColor ?? defaultBackgroundColor,
);
this._backgroundPadding = Cartesian2.clone(
options.backgroundPadding ?? defaultBackgroundPadding,
);
this._style = options.style ?? LabelStyle.FILL;
this._verticalOrigin = options.verticalOrigin ?? VerticalOrigin.BASELINE;
this._horizontalOrigin = options.horizontalOrigin ?? HorizontalOrigin.LEFT;
this._pixelOffset = Cartesian2.clone(options.pixelOffset ?? Cartesian2.ZERO);
this._eyeOffset = Cartesian3.clone(options.eyeOffset ?? Cartesian3.ZERO);
this._position = Cartesian3.clone(options.position ?? Cartesian3.ZERO);
this._scale = options.scale ?? 1.0;
this._id = options.id;
this._translucencyByDistance = translucencyByDistance;
this._pixelOffsetScaleByDistance = pixelOffsetScaleByDistance;
this._scaleByDistance = scaleByDistance;
this._heightReference = options.heightReference ?? HeightReference.NONE;
this._distanceDisplayCondition = distanceDisplayCondition;
this._disableDepthTestDistance = options.disableDepthTestDistance;
this._labelCollection = labelCollection;
this._glyphs = [];
this._backgroundBillboard = undefined;
this._batchIndex = undefined; // Used only by Vector3DTilePoints and BillboardCollection
this._rebindAllGlyphs = true;
this._repositionAllGlyphs = true;
this._actualClampedPosition = undefined;
this._removeCallbackFunc = undefined;
this._mode = undefined;
this._clusterShow = true;
this.text = options.text ?? "";
this._relativeSize = 1.0;
parseFont(this);
this._updateClamping();
}
Object.defineProperties(Label.prototype, {
/**
* Determines if this label will be shown. Use this to hide or show a label, instead
* of removing it and re-adding it to the collection.
* @memberof Label.prototype
* @type {boolean}
* @default true
*/
show: {
get: function () {
return this._show;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
if (this._show !== value) {
this._show = value;
const glyphs = this._glyphs;
for (let i = 0, len = glyphs.length; i < len; i++) {
const billboard = glyphs[i].billboard;
Eif (defined(billboard)) {
billboard.show = value;
}
}
const backgroundBillboard = this._backgroundBillboard;
if (defined(backgroundBillboard)) {
backgroundBillboard.show = value;
}
}
},
},
/**
* Gets or sets the Cartesian position of this label.
* @memberof Label.prototype
* @type {Cartesian3}
*/
position: {
get: function () {
return this._position;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
const position = this._position;
if (!Cartesian3.equals(position, value)) {
Cartesian3.clone(value, position);
const glyphs = this._glyphs;
for (let i = 0, len = glyphs.length; i < len; i++) {
const billboard = glyphs[i].billboard;
if (defined(billboard)) {
billboard.position = value;
}
}
const backgroundBillboard = this._backgroundBillboard;
if (defined(backgroundBillboard)) {
backgroundBillboard.position = value;
}
this._updateClamping();
}
},
},
/**
* Gets or sets the height reference of this billboard.
* @memberof Label.prototype
* @type {HeightReference}
* @default HeightReference.NONE
*/
heightReference: {
get: function () {
return this._heightReference;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
Iif (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
if (value !== this._heightReference) {
this._heightReference = value;
const glyphs = this._glyphs;
for (let i = 0, len = glyphs.length; i < len; i++) {
const billboard = glyphs[i].billboard;
Eif (defined(billboard)) {
billboard.heightReference = value;
}
}
const backgroundBillboard = this._backgroundBillboard;
Iif (defined(backgroundBillboard)) {
backgroundBillboard.heightReference = value;
}
repositionAllGlyphs(this);
this._updateClamping();
}
},
},
/**
* Gets or sets the text of this label.
* @memberof Label.prototype
* @type {string}
*/
text: {
get: function () {
return this._text;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
if (this._text !== value) {
this._text = value;
const renderedValue = Label.filterUnsupportedCharacters(value);
this._renderedText = Label.enableRightToLeftDetection
? reverseRtl(renderedValue)
: renderedValue;
rebindAllGlyphs(this);
}
},
},
/**
* Gets or sets the font used to draw this label. Fonts are specified using the same syntax as the CSS 'font' property.
* @memberof Label.prototype
* @type {string}
* @default '30px sans-serif'
* @see {@link http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#text-styles|HTML canvas 2D context text styles}
*/
font: {
get: function () {
return this._font;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
if (this._font !== value) {
this._font = value;
rebindAllGlyphs(this);
parseFont(this);
}
},
},
/**
* Gets or sets the fill color of this label.
* @memberof Label.prototype
* @type {Color}
* @default Color.WHITE
* @see {@link http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#fill-and-stroke-styles|HTML canvas 2D context fill and stroke styles}
*/
fillColor: {
get: function () {
return this._fillColor;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
const fillColor = this._fillColor;
if (!Color.equals(fillColor, value)) {
Color.clone(value, fillColor);
rebindAllGlyphs(this);
}
},
},
/**
* Gets or sets the outline color of this label.
* @memberof Label.prototype
* @type {Color}
* @default Color.BLACK
* @see {@link http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#fill-and-stroke-styles|HTML canvas 2D context fill and stroke styles}
*/
outlineColor: {
get: function () {
return this._outlineColor;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
const outlineColor = this._outlineColor;
if (!Color.equals(outlineColor, value)) {
Color.clone(value, outlineColor);
rebindAllGlyphs(this);
}
},
},
/**
* Gets or sets the outline width of this label.
* @memberof Label.prototype
* @type {number}
* @default 1.0
* @see {@link http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#fill-and-stroke-styles|HTML canvas 2D context fill and stroke styles}
*/
outlineWidth: {
get: function () {
return this._outlineWidth;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
if (this._outlineWidth !== value) {
this._outlineWidth = value;
rebindAllGlyphs(this);
}
},
},
/**
* Determines if a background behind this label will be shown.
* @memberof Label.prototype
* @default false
* @type {boolean}
*/
showBackground: {
get: function () {
return this._showBackground;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
Iif (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
if (this._showBackground !== value) {
this._showBackground = value;
rebindAllGlyphs(this);
}
},
},
/**
* Gets or sets the background color of this label.
* @memberof Label.prototype
* @type {Color}
* @default new Color(0.165, 0.165, 0.165, 0.8)
*/
backgroundColor: {
get: function () {
return this._backgroundColor;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
Iif (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
const backgroundColor = this._backgroundColor;
if (!Color.equals(backgroundColor, value)) {
Color.clone(value, backgroundColor);
const backgroundBillboard = this._backgroundBillboard;
if (defined(backgroundBillboard)) {
backgroundBillboard.color = backgroundColor;
}
}
},
},
/**
* Gets or sets the background padding, in pixels, of this label. The <code>x</code> value
* controls horizontal padding, and the <code>y</code> value controls vertical padding.
* @memberof Label.prototype
* @type {Cartesian2}
* @default new Cartesian2(7, 5)
*/
backgroundPadding: {
get: function () {
return this._backgroundPadding;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
Iif (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
const backgroundPadding = this._backgroundPadding;
if (!Cartesian2.equals(backgroundPadding, value)) {
Cartesian2.clone(value, backgroundPadding);
repositionAllGlyphs(this);
}
},
},
/**
* Gets or sets the style of this label.
* @memberof Label.prototype
* @type {LabelStyle}
* @default LabelStyle.FILL
*/
style: {
get: function () {
return this._style;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
if (this._style !== value) {
this._style = value;
rebindAllGlyphs(this);
}
},
},
/**
* Gets or sets the pixel offset in screen space from the origin of this label. This is commonly used
* to align multiple labels and billboards at the same position, e.g., an image and text. The
* screen space origin is the top, left corner of the canvas; <code>x</code> increases from
* left to right, and <code>y</code> increases from top to bottom.
* <br /><br />
* <div align='center'>
* <table border='0' cellpadding='5'><tr>
* <td align='center'><code>default</code><br/><img src='Images/Label.setPixelOffset.default.png' width='250' height='188' /></td>
* <td align='center'><code>l.pixeloffset = new Cartesian2(25, 75);</code><br/><img src='Images/Label.setPixelOffset.x50y-25.png' width='250' height='188' /></td>
* </tr></table>
* The label's origin is indicated by the yellow point.
* </div>
* @memberof Label.prototype
* @type {Cartesian2}
* @default Cartesian2.ZERO
*/
pixelOffset: {
get: function () {
return this._pixelOffset;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
const pixelOffset = this._pixelOffset;
if (!Cartesian2.equals(pixelOffset, value)) {
Cartesian2.clone(value, pixelOffset);
const glyphs = this._glyphs;
for (let i = 0, len = glyphs.length; i < len; i++) {
const glyph = glyphs[i];
Eif (defined(glyph.billboard)) {
glyph.billboard.pixelOffset = value;
}
}
const backgroundBillboard = this._backgroundBillboard;
if (defined(backgroundBillboard)) {
backgroundBillboard.pixelOffset = value;
}
}
},
},
/**
* Gets or sets near and far translucency properties of a Label based on the Label's distance from the camera.
* A label's translucency will interpolate between the {@link NearFarScalar#nearValue} and
* {@link NearFarScalar#farValue} while the camera distance falls within the lower and upper bounds
* of the specified {@link NearFarScalar#near} and {@link NearFarScalar#far}.
* Outside of these ranges the label's translucency remains clamped to the nearest bound. If undefined,
* translucencyByDistance will be disabled.
* @memberof Label.prototype
* @type {NearFarScalar}
*
* @example
* // Example 1.
* // Set a label's translucencyByDistance to 1.0 when the
* // camera is 1500 meters from the label and disappear as
* // the camera distance approaches 8.0e6 meters.
* text.translucencyByDistance = new Cesium.NearFarScalar(1.5e2, 1.0, 8.0e6, 0.0);
*
* @example
* // Example 2.
* // disable translucency by distance
* text.translucencyByDistance = undefined;
*/
translucencyByDistance: {
get: function () {
return this._translucencyByDistance;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (defined(value) && value.far <= value.near) {
throw new DeveloperError(
"far distance must be greater than near distance.",
);
}
//>>includeEnd('debug');
const translucencyByDistance = this._translucencyByDistance;
if (!NearFarScalar.equals(translucencyByDistance, value)) {
this._translucencyByDistance = NearFarScalar.clone(
value,
translucencyByDistance,
);
const glyphs = this._glyphs;
for (let i = 0, len = glyphs.length; i < len; i++) {
const glyph = glyphs[i];
if (defined(glyph.billboard)) {
glyph.billboard.translucencyByDistance = value;
}
}
const backgroundBillboard = this._backgroundBillboard;
if (defined(backgroundBillboard)) {
backgroundBillboard.translucencyByDistance = value;
}
}
},
},
/**
* Gets or sets near and far pixel offset scaling properties of a Label based on the Label's distance from the camera.
* A label's pixel offset will be scaled between the {@link NearFarScalar#nearValue} and
* {@link NearFarScalar#farValue} while the camera distance falls within the lower and upper bounds
* of the specified {@link NearFarScalar#near} and {@link NearFarScalar#far}.
* Outside of these ranges the label's pixel offset scaling remains clamped to the nearest bound. If undefined,
* pixelOffsetScaleByDistance will be disabled.
* @memberof Label.prototype
* @type {NearFarScalar}
*
* @example
* // Example 1.
* // Set a label's pixel offset scale to 0.0 when the
* // camera is 1500 meters from the label and scale pixel offset to 10.0 pixels
* // in the y direction the camera distance approaches 8.0e6 meters.
* text.pixelOffset = new Cesium.Cartesian2(0.0, 1.0);
* text.pixelOffsetScaleByDistance = new Cesium.NearFarScalar(1.5e2, 0.0, 8.0e6, 10.0);
*
* @example
* // Example 2.
* // disable pixel offset by distance
* text.pixelOffsetScaleByDistance = undefined;
*/
pixelOffsetScaleByDistance: {
get: function () {
return this._pixelOffsetScaleByDistance;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (defined(value) && value.far <= value.near) {
throw new DeveloperError(
"far distance must be greater than near distance.",
);
}
//>>includeEnd('debug');
const pixelOffsetScaleByDistance = this._pixelOffsetScaleByDistance;
if (!NearFarScalar.equals(pixelOffsetScaleByDistance, value)) {
this._pixelOffsetScaleByDistance = NearFarScalar.clone(
value,
pixelOffsetScaleByDistance,
);
const glyphs = this._glyphs;
for (let i = 0, len = glyphs.length; i < len; i++) {
const glyph = glyphs[i];
Eif (defined(glyph.billboard)) {
glyph.billboard.pixelOffsetScaleByDistance = value;
}
}
const backgroundBillboard = this._backgroundBillboard;
if (defined(backgroundBillboard)) {
backgroundBillboard.pixelOffsetScaleByDistance = value;
}
}
},
},
/**
* Gets or sets near and far scaling properties of a Label based on the label's distance from the camera.
* A label's scale will interpolate between the {@link NearFarScalar#nearValue} and
* {@link NearFarScalar#farValue} while the camera distance falls within the lower and upper bounds
* of the specified {@link NearFarScalar#near} and {@link NearFarScalar#far}.
* Outside of these ranges the label's scale remains clamped to the nearest bound. If undefined,
* scaleByDistance will be disabled.
* @memberof Label.prototype
* @type {NearFarScalar}
*
* @example
* // Example 1.
* // Set a label's scaleByDistance to scale by 1.5 when the
* // camera is 1500 meters from the label and disappear as
* // the camera distance approaches 8.0e6 meters.
* label.scaleByDistance = new Cesium.NearFarScalar(1.5e2, 1.5, 8.0e6, 0.0);
*
* @example
* // Example 2.
* // disable scaling by distance
* label.scaleByDistance = undefined;
*/
scaleByDistance: {
get: function () {
return this._scaleByDistance;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (defined(value) && value.far <= value.near) {
throw new DeveloperError(
"far distance must be greater than near distance.",
);
}
//>>includeEnd('debug');
const scaleByDistance = this._scaleByDistance;
if (!NearFarScalar.equals(scaleByDistance, value)) {
this._scaleByDistance = NearFarScalar.clone(value, scaleByDistance);
const glyphs = this._glyphs;
for (let i = 0, len = glyphs.length; i < len; i++) {
const glyph = glyphs[i];
if (defined(glyph.billboard)) {
glyph.billboard.scaleByDistance = value;
}
}
const backgroundBillboard = this._backgroundBillboard;
if (defined(backgroundBillboard)) {
backgroundBillboard.scaleByDistance = value;
}
}
},
},
/**
* Gets and sets the 3D Cartesian offset applied to this label in eye coordinates. Eye coordinates is a left-handed
* coordinate system, where <code>x</code> points towards the viewer's right, <code>y</code> points up, and
* <code>z</code> points into the screen. Eye coordinates use the same scale as world and model coordinates,
* which is typically meters.
* <br /><br />
* An eye offset is commonly used to arrange multiple label or objects at the same position, e.g., to
* arrange a label above its corresponding 3D model.
* <br /><br />
* Below, the label is positioned at the center of the Earth but an eye offset makes it always
* appear on top of the Earth regardless of the viewer's or Earth's orientation.
* <br /><br />
* <div align='center'>
* <table border='0' cellpadding='5'><tr>
* <td align='center'><img src='Images/Billboard.setEyeOffset.one.png' width='250' height='188' /></td>
* <td align='center'><img src='Images/Billboard.setEyeOffset.two.png' width='250' height='188' /></td>
* </tr></table>
* <code>l.eyeOffset = new Cartesian3(0.0, 8000000.0, 0.0);</code><br /><br />
* </div>
* @memberof Label.prototype
* @type {Cartesian3}
* @default Cartesian3.ZERO
*/
eyeOffset: {
get: function () {
return this._eyeOffset;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
const eyeOffset = this._eyeOffset;
if (!Cartesian3.equals(eyeOffset, value)) {
Cartesian3.clone(value, eyeOffset);
const glyphs = this._glyphs;
for (let i = 0, len = glyphs.length; i < len; i++) {
const glyph = glyphs[i];
Eif (defined(glyph.billboard)) {
glyph.billboard.eyeOffset = value;
}
}
const backgroundBillboard = this._backgroundBillboard;
if (defined(backgroundBillboard)) {
backgroundBillboard.eyeOffset = value;
}
}
},
},
/**
* Gets or sets the horizontal origin of this label, which determines if the label is drawn
* to the left, center, or right of its anchor position.
* <br /><br />
* <div align='center'>
* <img src='Images/Billboard.setHorizontalOrigin.png' width='648' height='196' /><br />
* </div>
* @memberof Label.prototype
* @type {HorizontalOrigin}
* @default HorizontalOrigin.LEFT
* @example
* // Use a top, right origin
* l.horizontalOrigin = Cesium.HorizontalOrigin.RIGHT;
* l.verticalOrigin = Cesium.VerticalOrigin.TOP;
*/
horizontalOrigin: {
get: function () {
return this._horizontalOrigin;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
if (this._horizontalOrigin !== value) {
this._horizontalOrigin = value;
repositionAllGlyphs(this);
}
},
},
/**
* Gets or sets the vertical origin of this label, which determines if the label is
* to the above, below, or at the center of its anchor position.
* <br /><br />
* <div align='center'>
* <img src='Images/Billboard.setVerticalOrigin.png' width='695' height='175' /><br />
* </div>
* @memberof Label.prototype
* @type {VerticalOrigin}
* @default VerticalOrigin.BASELINE
* @example
* // Use a top, right origin
* l.horizontalOrigin = Cesium.HorizontalOrigin.RIGHT;
* l.verticalOrigin = Cesium.VerticalOrigin.TOP;
*/
verticalOrigin: {
get: function () {
return this._verticalOrigin;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
if (this._verticalOrigin !== value) {
this._verticalOrigin = value;
const glyphs = this._glyphs;
for (let i = 0, len = glyphs.length; i < len; i++) {
const glyph = glyphs[i];
if (defined(glyph.billboard)) {
glyph.billboard.verticalOrigin = value;
}
}
const backgroundBillboard = this._backgroundBillboard;
if (defined(backgroundBillboard)) {
backgroundBillboard.verticalOrigin = value;
}
repositionAllGlyphs(this);
}
},
},
/**
* Gets or sets the uniform scale that is multiplied with the label's size in pixels.
* A scale of <code>1.0</code> does not change the size of the label; a scale greater than
* <code>1.0</code> enlarges the label; a positive scale less than <code>1.0</code> shrinks
* the label.
* <br /><br />
* Applying a large scale value may pixelate the label. To make text larger without pixelation,
* use a larger font size when calling {@link Label#font} instead.
* <br /><br />
* <div align='center'>
* <img src='Images/Label.setScale.png' width='400' height='300' /><br/>
* From left to right in the above image, the scales are <code>0.5</code>, <code>1.0</code>,
* and <code>2.0</code>.
* </div>
* @memberof Label.prototype
* @type {number}
* @default 1.0
*/
scale: {
get: function () {
return this._scale;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (!defined(value)) {
throw new DeveloperError("value is required.");
}
//>>includeEnd('debug');
if (this._scale !== value) {
this._scale = value;
const glyphs = this._glyphs;
for (let i = 0, len = glyphs.length; i < len; i++) {
const glyph = glyphs[i];
Eif (defined(glyph.billboard)) {
glyph.billboard.scale = value * this._relativeSize;
}
}
const backgroundBillboard = this._backgroundBillboard;
if (defined(backgroundBillboard)) {
backgroundBillboard.scale = value * this._relativeSize;
}
repositionAllGlyphs(this);
}
},
},
/**
* Gets the total scale of the label, which is the label's scale multiplied by the computed relative size
* of the desired font compared to the generated glyph size.
* @memberof Label.prototype
* @type {number}
* @default 1.0
*/
totalScale: {
get: function () {
return this._scale * this._relativeSize;
},
},
/**
* Gets or sets the condition specifying at what distance from the camera that this label will be displayed.
* @memberof Label.prototype
* @type {DistanceDisplayCondition}
* @default undefined
*/
distanceDisplayCondition: {
get: function () {
return this._distanceDisplayCondition;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (defined(value) && value.far <= value.near) {
throw new DeveloperError("far must be greater than near");
}
//>>includeEnd('debug');
if (
!DistanceDisplayCondition.equals(value, this._distanceDisplayCondition)
) {
this._distanceDisplayCondition = DistanceDisplayCondition.clone(
value,
this._distanceDisplayCondition,
);
const glyphs = this._glyphs;
for (let i = 0, len = glyphs.length; i < len; i++) {
const glyph = glyphs[i];
Iif (defined(glyph.billboard)) {
glyph.billboard.distanceDisplayCondition = value;
}
}
const backgroundBillboard = this._backgroundBillboard;
Iif (defined(backgroundBillboard)) {
backgroundBillboard.distanceDisplayCondition = value;
}
}
},
},
/**
* Gets or sets the distance from the camera at which to disable the depth test to, for example, prevent clipping against terrain.
* When set to zero, the depth test is always applied. When set to Number.POSITIVE_INFINITY, the depth test is never applied.
* @memberof Label.prototype
* @type {number}
*/
disableDepthTestDistance: {
get: function () {
return this._disableDepthTestDistance;
},
set: function (value) {
if (this._disableDepthTestDistance !== value) {
//>>includeStart('debug', pragmas.debug);
if (defined(value) && value < 0.0) {
throw new DeveloperError(
"disableDepthTestDistance must be greater than 0.0.",
);
}
//>>includeEnd('debug');
this._disableDepthTestDistance = value;
const glyphs = this._glyphs;
for (let i = 0, len = glyphs.length; i < len; i++) {
const glyph = glyphs[i];
if (defined(glyph.billboard)) {
glyph.billboard.disableDepthTestDistance = value;
}
}
const backgroundBillboard = this._backgroundBillboard;
Iif (defined(backgroundBillboard)) {
backgroundBillboard.disableDepthTestDistance = value;
}
}
},
},
/**
* Gets or sets the user-defined value returned when the label is picked.
* @memberof Label.prototype
* @type {*}
*/
id: {
get: function () {
return this._id;
},
set: function (value) {
if (this._id !== value) {
this._id = value;
const glyphs = this._glyphs;
for (let i = 0, len = glyphs.length; i < len; i++) {
const glyph = glyphs[i];
Eif (defined(glyph.billboard)) {
glyph.billboard.id = value;
}
}
const backgroundBillboard = this._backgroundBillboard;
if (defined(backgroundBillboard)) {
backgroundBillboard.id = value;
}
}
},
},
/**
* @private
*/
pickId: {
get: function () {
if (this._glyphs.length === 0 || !defined(this._glyphs[0].billboard)) {
return undefined;
}
return this._glyphs[0].billboard.pickId;
},
},
/**
* Keeps track of the position of the label based on the height reference.
* @memberof Label.prototype
* @type {Cartesian3}
* @private
*/
_clampedPosition: {
get: function () {
return this._actualClampedPosition;
},
set: function (value) {
this._actualClampedPosition = Cartesian3.clone(
value,
this._actualClampedPosition,
);
const glyphs = this._glyphs;
for (let i = 0, len = glyphs.length; i < len; i++) {
const glyph = glyphs[i];
Eif (defined(glyph.billboard)) {
// Set all the private values here, because we already clamped to ground
// so we don't want to do it again for every glyph
glyph.billboard._clampedPosition = value;
}
}
const backgroundBillboard = this._backgroundBillboard;
Iif (defined(backgroundBillboard)) {
backgroundBillboard._clampedPosition = value;
}
},
},
/**
* Determines whether or not this label will be shown or hidden because it was clustered.
* @memberof Label.prototype
* @type {boolean}
* @default true
* @private
*/
clusterShow: {
get: function () {
return this._clusterShow;
},
set: function (value) {
if (this._clusterShow !== value) {
this._clusterShow = value;
const glyphs = this._glyphs;
for (let i = 0, len = glyphs.length; i < len; i++) {
const glyph = glyphs[i];
Eif (defined(glyph.billboard)) {
glyph.billboard.clusterShow = value;
}
}
const backgroundBillboard = this._backgroundBillboard;
if (defined(backgroundBillboard)) {
backgroundBillboard.clusterShow = value;
}
}
},
},
});
Label.prototype._updateClamping = function () {
Billboard._updateClamping(this._labelCollection, this);
};
/**
* Computes the screen-space position of the label's origin, taking into account eye and pixel offsets.
* The screen space origin is the top, left corner of the canvas; <code>x</code> increases from
* left to right, and <code>y</code> increases from top to bottom.
*
* @param {Scene} scene The scene the label is in.
* @param {Cartesian2} [result] The object onto which to store the result.
* @returns {Cartesian2} The screen-space position of the label.
*
*
* @example
* console.log(l.computeScreenSpacePosition(scene).toString());
*
* @see Label#eyeOffset
* @see Label#pixelOffset
*/
Label.prototype.computeScreenSpacePosition = function (scene, result) {
//>>includeStart('debug', pragmas.debug);
if (!defined(scene)) {
throw new DeveloperError("scene is required.");
}
//>>includeEnd('debug');
if (!defined(result)) {
result = new Cartesian2();
}
const labelCollection = this._labelCollection;
const modelMatrix = labelCollection.modelMatrix;
const actualPosition = defined(this._actualClampedPosition)
? this._actualClampedPosition
: this._position;
const windowCoordinates = Billboard._computeScreenSpacePosition(
modelMatrix,
actualPosition,
this._eyeOffset,
this._pixelOffset,
scene,
result,
);
return windowCoordinates;
};
/**
* Gets a label's screen space bounding box centered around screenSpacePosition.
* @param {Label} label The label to get the screen space bounding box for.
* @param {Cartesian2} screenSpacePosition The screen space center of the label.
* @param {BoundingRectangle} [result] The object onto which to store the result.
* @returns {BoundingRectangle} The screen space bounding box.
*
* @private
*/
Label.getScreenSpaceBoundingBox = function (
label,
screenSpacePosition,
result,
) {
let x = 0;
let y = 0;
let width = 0;
let height = 0;
const scale = label.totalScale;
const backgroundBillboard = label._backgroundBillboard;
if (defined(backgroundBillboard)) {
x = screenSpacePosition.x + backgroundBillboard._translate.x;
y = screenSpacePosition.y - backgroundBillboard._translate.y;
width = backgroundBillboard.width * scale;
height = backgroundBillboard.height * scale;
if (
label.verticalOrigin === VerticalOrigin.BOTTOM ||
label.verticalOrigin === VerticalOrigin.BASELINE
) {
y -= height;
} else Eif (label.verticalOrigin === VerticalOrigin.CENTER) {
y -= height * 0.5;
}
} else {
x = Number.POSITIVE_INFINITY;
y = Number.POSITIVE_INFINITY;
let maxX = 0;
let maxY = 0;
const glyphs = label._glyphs;
const length = glyphs.length;
for (let i = 0; i < length; ++i) {
const glyph = glyphs[i];
const billboard = glyph.billboard;
if (!defined(billboard)) {
continue;
}
const glyphX = screenSpacePosition.x + billboard._translate.x;
let glyphY = screenSpacePosition.y - billboard._translate.y;
const glyphWidth = glyph.dimensions.width * scale;
const glyphHeight = glyph.dimensions.height * scale;
if (
label.verticalOrigin === VerticalOrigin.BOTTOM ||
label.verticalOrigin === VerticalOrigin.BASELINE
) {
glyphY -= glyphHeight;
} else if (label.verticalOrigin === VerticalOrigin.CENTER) {
glyphY -= glyphHeight * 0.5;
}
if (label._verticalOrigin === VerticalOrigin.TOP) {
glyphY += SDFSettings.PADDING * scale;
} else if (
label._verticalOrigin === VerticalOrigin.BOTTOM ||
label._verticalOrigin === VerticalOrigin.BASELINE
) {
glyphY -= SDFSettings.PADDING * scale;
}
x = Math.min(x, glyphX);
y = Math.min(y, glyphY);
maxX = Math.max(maxX, glyphX + glyphWidth);
maxY = Math.max(maxY, glyphY + glyphHeight);
}
width = maxX - x;
height = maxY - y;
}
if (!defined(result)) {
result = new BoundingRectangle();
}
result.x = x;
result.y = y;
result.width = width;
result.height = height;
return result;
};
/**
* Removes control characters and soft hyphon (auto-wrap) characters, which will cause an error when rendering a glyph. This does not remove tabs, carriage returns, or newlines.
* @private
* @param {string} text The original label text
* @returns {string} The renderable filtered text
*/
Label.filterUnsupportedCharacters = function (text) {
const problematicCharactersRegex = new RegExp(
// eslint-disable-next-line no-control-regex
/[\u0000-\u0008\u000E-\u001F\u00ad\u202a-\u206f\u200b-\u200f]/,
"g",
);
return text.replace(problematicCharactersRegex, "");
};
/**
* Determines if this label equals another label. Labels are equal if all their properties
* are equal. Labels in different collections can be equal.
*
* @param {Label} [other] The label to compare for equality.
* @returns {boolean} <code>true</code> if the labels are equal; otherwise, <code>false</code>.
*/
Label.prototype.equals = function (other) {
return (
this === other ||
(defined(other) &&
this._show === other._show &&
this._scale === other._scale &&
this._outlineWidth === other._outlineWidth &&
this._showBackground === other._showBackground &&
this._style === other._style &&
this._verticalOrigin === other._verticalOrigin &&
this._horizontalOrigin === other._horizontalOrigin &&
this._heightReference === other._heightReference &&
this._renderedText === other._renderedText &&
this._font === other._font &&
Cartesian3.equals(this._position, other._position) &&
Color.equals(this._fillColor, other._fillColor) &&
Color.equals(this._outlineColor, other._outlineColor) &&
Color.equals(this._backgroundColor, other._backgroundColor) &&
Cartesian2.equals(this._backgroundPadding, other._backgroundPadding) &&
Cartesian2.equals(this._pixelOffset, other._pixelOffset) &&
Cartesian3.equals(this._eyeOffset, other._eyeOffset) &&
NearFarScalar.equals(
this._translucencyByDistance,
other._translucencyByDistance,
) &&
NearFarScalar.equals(
this._pixelOffsetScaleByDistance,
other._pixelOffsetScaleByDistance,
) &&
NearFarScalar.equals(this._scaleByDistance, other._scaleByDistance) &&
DistanceDisplayCondition.equals(
this._distanceDisplayCondition,
other._distanceDisplayCondition,
) &&
this._disableDepthTestDistance === other._disableDepthTestDistance &&
this._id === other._id)
);
};
/**
* Returns true if this object was destroyed; otherwise, false.
* <br /><br />
* If this object was destroyed, it should not be used; calling any function other than
* <code>isDestroyed</code> will result in a {@link DeveloperError} exception.
*
* @returns {boolean} True if this object was destroyed; otherwise, false.
*/
Label.prototype.isDestroyed = function () {
return false;
};
/**
* Determines whether or not run the algorithm, that match the text of the label to right-to-left languages
* @memberof Label
* @type {boolean}
* @default false
*
* @example
* // Example 1.
* // Set a label's rightToLeft before init
* Cesium.Label.enableRightToLeftDetection = true;
* const myLabelEntity = viewer.entities.add({
* label: {
* id: 'my label',
* text: 'זה טקסט בעברית \n ועכשיו יורדים שורה',
* }
* });
*
* @example
* // Example 2.
* const myLabelEntity = viewer.entities.add({
* label: {
* id: 'my label',
* text: 'English text'
* }
* });
* // Set a label's rightToLeft after init
* Cesium.Label.enableRightToLeftDetection = true;
* myLabelEntity.text = 'טקסט חדש';
*/
Label.enableRightToLeftDetection = false;
function convertTextToTypes(text, rtlChars) {
const ltrChars = /[a-zA-Z0-9]/;
const bracketsChars = /[()[\]{}<>]/;
const parsedText = [];
let word = "";
let lastType = textTypes.LTR;
let currentType = "";
const textLength = text.length;
for (let textIndex = 0; textIndex < textLength; ++textIndex) {
const character = text.charAt(textIndex);
if (rtlChars.test(character)) {
currentType = textTypes.RTL;
} else if (ltrChars.test(character)) {
currentType = textTypes.LTR;
} else if (bracketsChars.test(character)) {
currentType = textTypes.BRACKETS;
} else {
currentType = textTypes.WEAK;
}
if (textIndex === 0) {
lastType = currentType;
}
if (lastType === currentType && currentType !== textTypes.BRACKETS) {
word += character;
} else {
if (word !== "") {
parsedText.push({ Type: lastType, Word: word });
}
lastType = currentType;
word = character;
}
}
parsedText.push({ Type: currentType, Word: word });
return parsedText;
}
function reverseWord(word) {
return word.split("").reverse().join("");
}
function spliceWord(result, pointer, word) {
return result.slice(0, pointer) + word + result.slice(pointer);
}
function reverseBrackets(bracket) {
switch (bracket) {
case "(":
return ")";
case ")":
return "(";
case "[":
return "]";
case "]":
return "[";
case "{":
return "}";
case "}":
return "{";
case "<":
return ">";
case ">":
return "<";
}
}
// To add another language, add its Unicode block range(s) to the below regex.
const hebrew = "\u05D0-\u05EA";
const arabic = "\u0600-\u06FF\u0750-\u077F\u08A0-\u08FF";
const rtlChars = new RegExp(`[${hebrew}${arabic}]`);
/**
*
* @param {string} value the text to parse and reorder
* @returns {string} the text as rightToLeft direction
* @private
*/
function reverseRtl(value) {
const texts = value.split("\n");
let result = "";
for (let i = 0; i < texts.length; i++) {
const text = texts[i];
// first character of the line is a RTL character, so need to manage different cases
const rtlDir = rtlChars.test(text.charAt(0));
const parsedText = convertTextToTypes(text, rtlChars);
let splicePointer = 0;
let line = "";
for (let wordIndex = 0; wordIndex < parsedText.length; ++wordIndex) {
const subText = parsedText[wordIndex];
const reverse =
subText.Type === textTypes.BRACKETS
? reverseBrackets(subText.Word)
: reverseWord(subText.Word);
if (rtlDir) {
if (subText.Type === textTypes.RTL) {
line = reverse + line;
splicePointer = 0;
} else if (subText.Type === textTypes.LTR) {
line = spliceWord(line, splicePointer, subText.Word);
splicePointer += subText.Word.length;
} else Eif (
subText.Type === textTypes.WEAK ||
subText.Type === textTypes.BRACKETS
) {
// current word is weak, last one was bracket
if (
subText.Type === textTypes.WEAK &&
parsedText[wordIndex - 1].Type === textTypes.BRACKETS
) {
line = reverse + line;
}
// current word is weak or bracket, last one was rtl
else if (parsedText[wordIndex - 1].Type === textTypes.RTL) {
line = reverse + line;
splicePointer = 0;
}
// current word is weak or bracket, there is at least one more word
else if (parsedText.length > wordIndex + 1) {
// next word is rtl
if (parsedText[wordIndex + 1].Type === textTypes.RTL) {
line = reverse + line;
splicePointer = 0;
} else {
line = spliceWord(line, splicePointer, subText.Word);
splicePointer += subText.Word.length;
}
}
// current word is weak or bracket, and it the last in this line
else {
line = spliceWord(line, 0, reverse);
}
}
}
// ltr line, rtl word
else if (subText.Type === textTypes.RTL) {
line = spliceWord(line, splicePointer, reverse);
}
// ltr line, ltr word
else if (subText.Type === textTypes.LTR) {
line += subText.Word;
splicePointer = line.length;
}
// ltr line, weak or bracket word
else if (
subText.Type === textTypes.WEAK ||
subText.Type === textTypes.BRACKETS
) {
// not first word in line
if (wordIndex > 0) {
// last word was rtl
if (parsedText[wordIndex - 1].Type === textTypes.RTL) {
// there is at least one more word
if (parsedText.length > wordIndex + 1) {
// next word is rtl
if (parsedText[wordIndex + 1].Type === textTypes.RTL) {
line = spliceWord(line, splicePointer, reverse);
} else {
line += subText.Word;
splicePointer = line.length;
}
} else {
line += subText.Word;
}
} else {
line += subText.Word;
splicePointer = line.length;
}
} else {
line += subText.Word;
splicePointer = line.length;
}
}
}
result += line;
if (i < texts.length - 1) {
result += "\n";
}
}
return result;
}
export default Label;
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