Namespace: util

Classes

ClusterGroup

ClusterTree

DistanceGrid

Type Definitions

geo.util.cssColorConversionRecordobject

Properties:

Name	Type	Description
name	string	The name of the color conversion.
regex	RegExp	A regex that, if it matches the color string, will cause the process function to be invoked.
process	function	A function that takes (color, match) with the original color string and the results of matching the regex using the regex's exec function. It outputs a geo.geoColorObject color object or the original color string if there is still a parsing failure.

Static Members

staticgeo.util.cssAngleUnitsBase

A dictionary of conversion factors for angular CSS measurements.

staticgeo.util.cssColorConversions

A list of regex and processing functions for color conversions to rgb objects. Each entry is a geo.util.cssColorConversionRecord. In general, these conversions are somewhat more forgiving than the css specification (see https://drafts.csswg.org/css-color/) in that percentages may be mixed with numbers, and that floating point values are accepted for all numbers. Commas are optional. As per the latest draft standard, rgb and rgba are aliases of each other, as are hsl and hsla.

Properties:

Name	Type	Description
cssColorConversions	Array.<geo.util.cssColorConversionRecord>

staticgeo.util.cssNumberRegex

A regular expression string that will parse a number (integer or floating point) for CSS properties.

staticgeo.util.radiusEarth

Radius of the earth in meters, from the equatorial radius of SRID 4326.

Static Methods

staticgeo.util.actionMatch(inputs, modifiers, actions){geo.actionRecord}

util/common.js, line 489

Determine if the current inputs and modifiers match a known action.

Name	Type	Description
inputs	object	Aan object where each input that is currently active is truthy. Common inputs are left, right, middle, wheel, pan, rotate.
modifiers	object	An object where each currently applied modifier is truthy. Common modifiers are shift, ctrl, alt, meta.
actions	Array.<geo.actionRecord>	A list of actions to compare to the inputs and modifiers. The first action that matches will be returned.

Returns:

Type	Description
geo.actionRecord	A matching action or undefined.

staticgeo.util.addAction(actions, action, toEnd)

util/common.js, line 410

Add an action to the list of handled actions.

Name	Type	Description
actions	Array.<geo.actionRecord>	An array of actions to adjust as needed.
action	geo.actionRecord	An object defining the action. Use action, name, and owner to make this entry distinct if it will need to be removed later.
toEnd	boolean	The action is added at the beginning of the actions list unless toEnd is true. Earlier actions prevent later actions with the similar input and modifiers.

staticgeo.util.adjustActions(actions)

util/common.js, line 377

Ensure that the input and modifiers properties of all actions are objects, not plain strings.

Name	Type	Description
actions	Array.<geo.actionRecord>	An array of actions to adjust as needed.

staticgeo.util.centerFromPerimeter(coor){geo.geoPosition|undefined}

util/common.js, line 613

Return the coordinate associated with the center of the perimeter formed from a list of points. This averages all of the vertices in the perimeter weighted by the line length on either side of each point. Functionally, this is the same as the average of all the points of the lines of the perimeter.

Name	Type	Description
coor	geo.geoPolygon	An array of coordinates. This can also be a polygon object with an outer element with an array of coordinates.

Returns:

Type	Description
geo.geoPosition | undefined	The position for the center, or undefined if no such position exists.

staticgeo.util.compareArrays(a1, a2){boolean}

util/common.js, line 275

Compare two arrays and return if their contents are equal.

Name	Type	Description
a1	array	First array to compare.
a2	array	Second array to compare.

Returns:

Type	Description
boolean	true if the contents of the arrays are equal.

staticgeo.util.convertColor(color){geo.geoColorObject}

util/color.js, line 112

Convert a color to a standard rgb object. Allowed inputs:

• rgb object with optional 'a' (alpha) value.
• css color name
• #rrggbb, #rrggbbaa, #rgb, #rgba hexadecimal colors
• rgb(), rgba(), hsl(), and hsla() css colors
• transparent The output object always contains r, g, b on a scale of [0-1]. If an alpha value is specified, the output will also contain an 'a' value on a scale of [0-1]. Objects already in rgb format are not checked to make sure that all parameters are in the range of [0-1], but string inputs are so validated.

Name	Type	Description
color	geo.geoColor	Any valid color input.

Returns:

Type	Description
geo.geoColorObject	An rgb color object, possibly with an 'a' value. If the input cannot be converted to a valid color, the input value is returned.

staticgeo.util.convertColorAndOpacity(color, opacity, defaultColor){geo.geoColorObject}

util/color.js, line 183

Convert a color (possibly with opacity) and an optional opacity value to a color object that always has opacity. The opacity is guaranteed to be within [0-1]. A valid color object is always returned.

Name	Type	Default	Description
color	geo.geoColor		optional Any valid color input. If an invalid value or no value is supplied, the defaultColor is used.
opacity	number	1	optional A value from [0-1]. This is multiplied with the opacity from color.
defaultColor	geo.geoColorObject	{r: 0, g: 0, b: 0}	optional The color to use if an invalid color is supplied.

Returns:

Type	Description
geo.geoColorObject	An rgba color object.

staticgeo.util.convertColorToHex(color, allowAlpha){string}

util/color.js, line 213

Convert a color to a six or eight digit hex value prefixed with #.

Name	Type	Description
color	geo.geoColorObject	The color object to convert.
allowAlpha	boolean	optional If truthy and color has a defined a value, include the alpha channel in the output. If 'needed', only include the alpha channel if it is set and not 1.

Returns:

Type	Description
string	A color string.

staticgeo.util.convertColorToRGBA(color){string}

util/color.js, line 234

Convert a color to a css rgba() value.

Name	Type	Description
color	geo.geoColorObject	The color object to convert.

Returns:

Type	Description
string	A color string.

staticgeo.util.crossedLineSegmentPolygon2d(pt1, pt2, poly){boolean}

util/common.js, line 745

Determine if a line segment crosses any line segments of a polygon.

Name	Type	Description
pt1	geo.geoPosition	One endpoint of the line.
pt2	geo.geoPosition	The other endpoint of the line.
poly	geo.polygonObject	The polygon.

Returns:

Type	Description
boolean	True if the segment cross any segment of the polygon.

staticgeo.util.crossedLineSegments2d(seg1pt1, seg1pt2, seg2pt1, seg2pt2){boolean}

util/common.js, line 775

Determine if two line segments cross. They are not considered crossing if they share a vertex. They are crossing if either of one segment's vertices are collinear with the other segment.

Name	Type	Description
seg1pt1	geo.geoPosition	One endpoint of the first segment.
seg1pt2	geo.geoPosition	The other endpoint of the first segment.
seg2pt1	geo.geoPosition	One endpoint of the second segment.
seg2pt2	geo.geoPosition	The other endpoint of the second segment.

Returns:

Type	Description
boolean	True if the segments cross.

staticgeo.util.debounce(delay, at_begin, callback, accumulator){function}

util/throttle.js, line 151

Debounce execution of a function. Debouncing, unlike throttling, guarantees that a function is only executed a single time, either at the very beginning of a series of calls, or at the very end. If you want to simply rate-limit execution of a function, see the <jQuery.throttle> method.

In this visualization, | is a debounced-function call and X is the actual callback execution:

::

Debounced with at_begin specified as false or unspecified: ||||||||||||||||||||||||| (pause) ||||||||||||||||||||||||| X X

Debounced with at_begin specified as true: ||||||||||||||||||||||||| (pause) ||||||||||||||||||||||||| X X

The bulk of the work is handled by the geo.util.throttle function.

Name	Type	Default	Description
delay	number		A zero-or-greater delay in milliseconds. For event callbacks, values around 100 or 250 (or even higher) are most useful.
at_begin	boolean	false	optional If at_begin is false or unspecified, callback will only be executed delay milliseconds after the last debounced-function call. If at_begin is true, callback will be executed only at the first debounced-function call. (After the throttled-function has not been called for delay milliseconds, the internal counter is reset)
callback	function		A function to be executed after delay milliseconds. The this context and all arguments are passed through, as-is, to callback when the debounced-function is executed.
accumulator	function		optional A function to be executed (synchronously) during each call to the wrapped function. Typically, this this method is used to accumulate values that the callback uses when it finally executes.

Returns:

Type	Description
function	A new, debounced, function.

Example

var debounced = geo.util.debounce( delay, [ at_begin, ] callback );
$('selector').bind( 'someevent', debounced );
$('selector').unbind( 'someevent', debounced );

staticgeo.util.dereferenceCssUrls(css, styleElem, styleDefer, styleKey, baseUrl)

util/common.js, line 1044

Check css text. Any url(http[s]...) references are dereferenced and stored as local base64 urls.

Name	Type	Description
css	string	The css to parse for urls.
styleElem	jQuery.selector | HTMLElement	The element that receives the css text after dereferencing or the DOM element that has style that will be updated.
styleDefer	jQuery.Deferred	A Deferred to resolve once dereferencing is complete.
styleKey	string	optional If unset, styleElem is a header element. If set, styleElem is a DOM element and the named style will be updated.
baseUrl	string	optional If present, this is the base for relative urls.

staticgeo.util.dereferenceElements(elem){Array.<jQuery.Deferred>}

util/common.js, line 993

Check svg image and html img tags. If the source is set, load images explicitly and convert them to local data:image references.

Name	Type	Description
elem	jQuery.selector	A jQuery selector or element set that may contain images.

Returns:

Type	Description
Array.<jQuery.Deferred>	A list of deferred objects that resolve when images are dereferenced.

staticgeo.util.distance2dToLineSquared(pt, line1, line2){number}

util/common.js, line 664

Get the square of the Euclidean 2D distance between a point and a line segment.

Name	Type	Description
pt	geo.geoPosition	The point.
line1	geo.geoPosition	One end of the line.
line2	geo.geoPosition	The other end of the line.

Returns:

Type	Description
number	The distance squared.

staticgeo.util.distanceToPolygon2d(pt, poly, onlySign){number}

util/common.js, line 693

Get the signed Euclidean 2D distance between a point and a polygon. The distance is positive if the point is inside of the polygon.

Name	Type	Description
pt	geo.geoPosition	The point.
poly	geo.polygonObject	The polygon.
onlySign	boolean	optional If truthy, only the sign of the answer is significant.

Returns:

Type	Description
number	The signed distance.

staticgeo.util.ensureFunction(f){function}

util/common.js, line 168

Return a function. If the supplied object is a function, return it. Otherwise, return a function that returns the argument.

Name	Type	Description
f	object	An object that might be a function.

Returns:

Type	Description
function	A function. Either f or a function that returns f.

staticgeo.util.escapeUnicodeHTML(text){string}

util/common.js, line 973

Escape any character in a string that has a code point >= 127.

Name	Type	Description
text	string	The string to escape.

Returns:

Type	Description
string	The escaped string.

staticgeo.util.getGeomBuffer(geom, srcName, len, allowLarger, allocateLarger){Float32Array}

util/common.js, line 344

Get a buffer for a vgl geometry source. If a buffer already exists and is the correct size, return it. Otherwise, allocate a new buffer; any data in an old buffer is discarded.

Name	Type	Default	Description
geom	vgl.geometryData		The geometry to reference and modify.
srcName	string		The name of the source.
len	number		The number of elements for the array.
allowLarger	number	0.2	optional If the existing buffer is larger than requested, don't reallocate it unless it exceeds the size of len * (1 + allowLarger).
allocateLarger	number	0.1	optional If reallocating an existing buffer, allocate len * (1 + allocateLarger) to reduce the need to reallocate on subsequent calls. If this is the first allocation (the previous size was 0), len is allocated.

Returns:

Type	Description
Float32Array	A buffer for the named source.

staticgeo.util.getMinMaxValues(values, min, max, limit){object}

util/common.js, line 928

Given an array, return the minimum and maximum values within the array. If a numeric value is specified for one or the other, return that instead.

Name	Type	Default	Description
values	Array.<number>		An array of numeric values.
min	number		optional If specified, use this instead of calculating the minimum.
max	number		optional If specified, use this instead of calculating the maximum.
limit	boolean	false	optional If truthy, if min is specified, the returned min will be the larger of the specified value and the computed value, and if max is specified, the returned value will be the smaller of the specified value and the computed value.

Returns:

Type	Description
object	An object with min and max, both numbers. If the array is empty, undefined may be returned for the min and max.

staticgeo.util.hasAction(actions, action, name, owner){geo.actionRecord}

util/common.js, line 433

Check if an action is in the actions list. An action matches if the action, name, and owner match. A null or undefined value will match all actions. If using a geo.actionRecord object, this is the same as passing (action.action, action.name, action.owner).

Name	Type	Description
actions	Array.<geo.actionRecord>	An array of actions to search.
action	geo.actionRecord | string	Either an action object or the name of an action.
name	string	optional Optional name associated with the action.
owner	string	optional Optional owner associated with the action.

Returns:

Type	Description
geo.actionRecord	The first matching action or null.

staticgeo.util.htmlToImage(elem, parents){jQuery.Deferred}

util/common.js, line 1162

Convert an html element to an image. This attempts to localize any images within the element. If there are other external references, the image may not work due to security considerations.

Name	Type	Description
elem	jQuery.selector	Either a jquery selector or an HTML element. This may contain multiple elements. The direct parent and grandparent of the element are used for class information.
parents	number	optional Number of layers up to travel to get class information.

Returns:

Type	Description
jQuery.Deferred	A jquery deferred object which receives an HTML Image element when resolved.

staticgeo.util.htmlToImageSupported(){boolean|jQuery.Deferred}

util/common.js, line 1113

Check if the current browser supports covnerting html to an image via an svg foreignObject and canvas. If this has not been checked before, it returns a Deferred that resolves to a boolean (never rejects). If the check has been done before, it returns a boolean.

Returns:

Type	Description
boolean | jQuery.Deferred

staticgeo.util.isFunction(f){boolean}

util/common.js, line 155

Test if an object is a function.

Name	Type	Description
f	object	An object that might be a function.

Returns:

Type	Description
boolean	true if the object is a function.

staticgeo.util.isObject(value){boolean}

util/common.js, line 1441

Test if an item is an object. This uses typeof not instanceof, since instanceof will return false for some things that we expect to be objects.

Name	Type	Description
value	*	The item to test.

Returns:

Type	Description
boolean	True if the tested item is an object.

staticgeo.util.isReadyImage(img, allowFailedImage){boolean}

util/common.js, line 118

Check if an object an HTML Image element that is fully loaded.

Name	Type	Description
img	object	An object that might be an HTML Image element.
allowFailedImage	boolean	optional If true, an image element that has a source and has failed to load is also considered 'ready' in the sense that it isn't expected to change to a better state.

Returns:

Type	Description
boolean	true if this is an image that is ready.

staticgeo.util.isReadyVideo(vid, allowFailedVideo){boolean}

util/common.js, line 137

Check if an object an HTMLVideoElement element that is loaded.

Name	Type	Description
vid	object	An object that might be an HTMLVideoElement.
allowFailedVideo	boolean	optional If true, an video element that has a source and has failed to load is also considered 'ready' in the sense that it isn't expected to change to a better state.

Returns:

Type	Description
boolean	true if this is a video that is ready.

staticgeo.util.mat3AsArray(){array}

util/common.js, line 301

Create a mat3 that is always an array. This should only be used if it will not be used in a WebGL context. Plain arrays usually use 64-bit float values, whereas mat3 defaults to 32-bit floats.

Returns:

Type	Description
array	Identity mat3 compatible array.

staticgeo.util.mat4AsArray(){array}

util/common.js, line 317

Create a mat4 that is always an array. This should only be used if it will not be used in a WebGL context. Plain arrays usually use 64-bit float values, whereas mat4 defaults to 32-bit floats.

Returns:

Type	Description
array	Identity mat4 compatible array.

staticgeo.util.mockWebglRenderer(supported)

util/mockVGL.js, line 19

Replace webgl.renderer with a mocked version for testing in a non-webGL state. Use restoreWebglRenderer to unmock. Call vgl.mockCounts() to get the number of times different webGL functions have been called.

Name	Type	Default	Description
supported	boolean	true	optional If false, then the webgl renderer will indicate that this is an unsupported browser environment.

staticgeo.util.normalizeCoordinates(p){geo.geoPosition}

util/common.js, line 216

Normalize a coordinate object into geo.geoPosition form. The input can be a 2 or 3 element array or an object with a variety of properties.

Name	Type	Description
p	object | array	The point to convert.

Returns:

Type	Description
geo.geoPosition	The point as an object with x, y, and z properties.

staticgeo.util.pixelCoordinateParams(node, width, height, tileWidth, tileHeight){object}

util/common.js, line 540

Return recommended defaults for map parameters and osm or tile layer parameters where the expected intent is to use the map in pixel coordinates (upper left is (0, 0), lower right is (width, height).

Name	Type	Description
node	string	nullable DOM selector for the map container.
width	number	Width of the whole map contents in pixels.
height	number	Height of the whole map contents in pixels.
tileWidth	number	optional If an osm or tile layer is going to be used, the width of a tile.
tileHeight	number	optional If an osm or tile layer is going to be used, the height of a tile.

Returns:

Type	Description
object	An object with map and layer properties. map is an object that can be passed to geo.map, and layer is an object that can be passed to map.createLayer.

Example

The returned objects can be modified or extended.

var results = pixelCoordinateParams('#map', 10000, 9000);
var map = geo.map($.extend(results.map, {clampZoom: false}));
map.createLayer('osm', results.layer);

staticgeo.util.pointInPolygon(point, outer, inner, range){boolean}

util/common.js, line 62

Check if a point is inside of a polygon. The point and polygon must be in the same coordinate system. A point exactly on the edge is not considered inside.

Name	Type	Description
point	geo.point2D	The test point.
outer	Array.<geo.point2D> | geo.polygonObject	The outer boundary of the polygon or a polygon object that has both the inner and outer boundaries.
inner	Array.<Array.<geo.point2D>>	optional A list of inner boundaries (holes).
range	object	optional If specified, this is the extent of the outer polygon and is used for early detection. Name Type Description min geo.point2D The minimum value of coordinates in the outer polygon. max geo.point2D The maximum value of coordinates in the outer polygon.

Returns:

Type	Description
boolean	true if the point is inside or on the border of the polygon.

staticgeo.util.pointToTriangleBasis2d(point, vert0, vert1, vert2){geo.point2D}

util/common.js, line 95

Return a point in the basis of the triangle. If the point is located on a vertex of the triangle, it will be at vert0: (0, 0), vert1: (1, 0), vert2: (0, 1). If it is within the triangle, its coordinates will be 0 <= x <= 1, 0 <= y <= 1, x + y <= 1. The point and vertices must be in the same coordinate system.

Name	Type	Description
point	geo.point2D	The point to convert.
vert0	geo.point2D	Vertex 0 of the triangle.
vert1	geo.point2D	Vertex 1 (x direction) of the triangle.
vert2	geo.point2D	Vertex 2 (y direction) of the triangle.

Returns:

Type	Description
geo.point2D	The point in the triangle basis, or undefined if the triangle is degenerate.

staticgeo.util.randomString(n){string}

util/common.js, line 195

Return a random string of length n || 8. The string consists of mixed-case ASCII alphanumerics.

Name	Type	Default	Description
n	number	8	optional The length of the string to return.

Returns:

Type	Description
string	A string of random characters.

staticgeo.util.range(start, end, step){Array.<number>}

util/common.js, line 259

Create an integer array contains elements from one integer to another integer.

Name	Type	Default	Description
start	number		The start integer.
end	number		The end integer.
step	number	1	optional The step.

Returns:

Type	Description
Array.<number>	An array of integers.

staticgeo.util.rdpLineSimplify(pts, tolerance, closed, noCrossLines){Array.<geo.geoPosition>}

util/common.js, line 855

Remove vertices from a chain of 2d line segments so that it is simpler but is close to the original overall shape within some tolerance limit. This is the Ramer–Douglas–Peucker algorithm. The first and last points will always remain the same for open lines. For closed lines (polygons), this picks an point that likely to be significant and then reduces it, possibly returning a single point.

Name	Type	Description
pts	Array.<geo.geoPosition>	A list of points forming the line or polygon.
tolerance	number	The maximum variation allowed. A value of zero will only remove perfectly collinear points.
closed	boolean	optional If true, this is a polygon rather than an open line. In this case, it is possible to get back a single point.
noCrossLines	Array.<Array.<geo.geoPosition>>	optional nullable A falsy value to allow the resultant line to cross itself, an empty array ([]) to prevent self-crossing, or an array of line segments to prevent self-crossing and disallow crossing any line segment in the list. Each entry in the list is an open line (with one segment less than the number of vertices). If self-crossing is prohibited, the resultant point set might not be as simplified as it could be.

Returns:

Type	Description
Array.<geo.geoPosition>	The new point set.

staticgeo.util.removeAction(actions, action, name, owner){number}

util/common.js, line 461

Remove all matching actions. Actions are matched as with hasAction.

Name	Type	Description
actions	Array.<geo.actionRecord>	An array of actions to adjust as needed.
action	geo.actionRecord | string	Either an action object or the name of an action.
name	string	optional Optional name associated with the action.
owner	string	optional Optional owner associated with the action.

Returns:

Type	Description
number	The number of actions that were removed.

staticgeo.util.restoreWebglRenderer()

util/mockVGL.js, line 191

Unmock the vgl renderer.

staticgeo.util.segmentCrossesLineList2d(pt1, pt2, lineList){boolean}

util/common.js, line 819

Check if a line segment crosses any segment from a list of lines. The segment is considered crossing it it touches a line segment, unless that line segment shares a vertex with the segment.

Name	Type	Description
pt1	geo.geoPosition	One end of the line segment.
pt2	geo.geoPosition	The other end of the line segment.
lineList	Array.<Array.<geo.geoPosition>>	A list of open lines. Each line is a list of vertices. The line segment is checked against each segment of each line in this list.

Returns:

Type	Description
boolean	True if the segment crosses any line segment.

staticgeo.util.throttle(delay, no_trailing, callback, accumulator, debounce_mode){function}

util/throttle.js, line 62

Throttle execution of a function. Especially useful for rate limiting execution of handlers on events like resize and scroll. If you want to rate-limit execution of a function to a single time see geo.util.debounce.

In this visualization, | is a throttled-function call and X is the actual callback execution:

Throttled with `no_trailing` specified as false or unspecified:
||||||||||||||||||||||||| (pause) |||||||||||||||||||||||||
X    X    X    X    X    X        X    X    X    X    X    X

Throttled with `no_trailing` specified as true:
||||||||||||||||||||||||| (pause) |||||||||||||||||||||||||
X    X    X    X    X             X    X    X    X    X

This is also used to handle debouncing a function.

Name	Type	Default	Description
delay	number		A zero-or-greater delay in milliseconds. For event callbacks, values around 100 or 250 (or even higher) are most useful.
no_trailing	boolean	false	optional If no_trailing is true, callback will only execute every delay milliseconds while the throttled-function is being called. If no_trailing is false or unspecified, callback will be executed one final time after the last throttled-function call. (After the throttled-function has not been called for delay milliseconds, the internal counter is reset)
callback	function		optional A function to be executed after delay milliseconds. The this context and all arguments are passed through, as-is, to callback when the throttled-function is executed.
accumulator	function		optional A function to be executed (synchronously) during each call to the wrapped function. Typically, this this method is used to accumulate values that the callback uses when it finally executes.
debounce_mode	boolean		optional See the at_begin parameter of the geo.util.debounce function.

Returns:

Type	Description
function	The throttled version of callback.

Example

var throttled = geo.util.throttle( delay, [ no_trailing, ] callback );
$('selector').bind( 'someevent', throttled );
$('selector').unbind( 'someevent', throttled );

staticgeo.util.timeFunctionStart(name, reset)

util/common.js, line 1310

Note the start time of a function (or any other section of code). This should be paired with timeFunctionStop, which will collect statistics on the amount of time spent in a function.

Name	Type	Description
name	string	Name to use for tracking the timing.
reset	boolean	If true, clear old tracking data for this named tracker.

staticgeo.util.timeFunctionStop(name)

util/common.js, line 1326

Note the stop time of a function (or any other section of code). This should be paired with timeFunctionStart.

Name	Type	Description
name	string	Name to use for tracking the timing.

staticgeo.util.timeReport(name){object}

util/common.js, line 1282

Report on one or all of the tracked timings.

Name	Type	Description
name	string	optional A name to report on, or undefined to report all.

Returns:

Type	Description
object	An object with timing information, or an object with properties for all tracked timings, each of which contains timing information.

staticgeo.util.timeRequestAnimationFrame(stop, reset, threshold, keep)

util/common.js, line 1357

Start or stop tracking the time spent in requestAnimationFrame. If tracked, the results can be fetched via timeFunctionReport('requestAnimationFrame').

Name	Type	Default	Description
stop	boolean		optional Falsy to start tracking, truthy to start tracking.
reset	boolean		optional If truthy, reset the statistics.
threshold	number	15	optional If present, set the threshold in milliseconds used in tracking slow callbacks.
keep	number	200	optional If present, set the number of recent frame times to track.

staticgeo.util.triangleTwiceSignedArea2d(pt1, pt2, pt3){number}

util/common.js, line 732

Get twice the signed area of a 2d triangle.

Name	Type	Description
pt1	geo.geoPosition	A vertex.
pt2	geo.geoPosition	A vertex.
pt3	geo.geoPosition	A vertex.

Returns:

Type	Description
number	Twice the signed area.

staticgeo.util.vec3AsArray(){array}

util/common.js, line 289

Create a vec3 that is always an array. This should only be used if it will not be used in a WebGL context. Plain arrays usually use 64-bit float values, whereas vec3 defaults to 32-bit floats.

Returns:

Type	Description
array	Zeroed-out vec3 compatible array.

staticgeo.util.wrapAngle(value){number}

util/common.js, line 955

Given a value in radians, return a value wrapped to the range [-PI, PI).

Name	Type	Description
value	number	A value in radians.

Returns:

Type	Description
number	The wrapped value.