MapboxGL.SymbolLayer

2019-10-24  本文已影响0人  jadefan

<MapboxGL.SymbolLayer />

SymbolLayer is a style layer that renders icon and text labels at points or along lines on the map.
SymbolLayer是在地图上的点处或沿线渲染图标和文本标签的样式图层。

props

Prop Type Default Required Description
id string none false A string that uniquely identifies the source in the style to which it is added.
sourceID string MapboxGL.StyleSource.DefaultSourceID false The source from which to obtain the data to style. If the source has not yet been added to the current style, the behavior is undefined.
sourceLayerID string none false Identifier of the layer within the source identified by the sourceID property from which the receiver obtains the data to style.
aboveLayerID string none false Inserts a layer above aboveLayerID.
belowLayerID string none false Inserts a layer below belowLayerID
layerIndex number none false Inserts a layer at a specified index
filter array none false Filter only the features in the source layer that satisfy a condition that you define
minZoomLevel number none false The minimum zoom level at which the layer gets parsed and appears.
maxZoomLevel number none false The maximum zoom level at which the layer gets parsed and appears.
style union none false Customizable style attributes

styles

Name

symbolPlacement

Description

Label placement relative to its geometry.

Type

enum

Default Value

point

Supported Values

point - The label is placed at the point where the geometry is located.<br />
line - The label is placed along the line of the geometry. Can only be used on LineString and Polygon geometries.<br />
line-center - The label is placed at the center of the line of the geometry. Can only be used on LineString and Polygon geometries. Note that a single feature in a vector tile may contain multiple line geometries.<br />

Expression

Parameters: zoom

Name

symbolSpacing

Description

Distance between two symbol anchors.

Type

number

Default Value

250

Units

pixels

Minimum

1

Expression

Parameters: zoom

Name

symbolAvoidEdges

Description

If true, the symbols will not cross tile edges to avoid mutual collisions. Recommended in layers that don't have enough padding in the vector tile to prevent collisions, or if it is a point symbol layer placed after a line symbol layer.

Type

boolean

Default Value

false

Expression

Parameters: zoom

Name

symbolZOrder

Description

Controls the order in which overlapping symbols in the same layer are rendered

Type

enum

Default Value

auto

Supported Values

auto - If symbol-sort-key is set, sort based on that. Otherwise sort symbols by their y-position relative to the viewport.<br />
viewport-y - Symbols will be sorted by their y-position relative to the viewport.<br />
source - Symbols will be rendered in the same order as the source data with no sorting applied.<br />

Expression

Parameters: zoom

Name

iconAllowOverlap

Description

If true, the icon will be visible even if it collides with other previously drawn symbols.

Type

boolean

Default Value

false

Requires

iconImage

Expression

Parameters: zoom

Name

iconIgnorePlacement

Description

If true, other symbols can be visible even if they collide with the icon.

Type

boolean

Default Value

false

Requires

iconImage

Expression

Parameters: zoom

Name

iconOptional

Description

If true, text will display without their corresponding icons when the icon collides with other symbols and the text does not.

Type

boolean

Default Value

false

Requires

iconImage, textField

Expression

Parameters: zoom

Name

iconRotationAlignment

Description

In combination with symbolPlacement, determines the rotation behavior of icons.

Type

enum

Default Value

auto

Supported Values

map - When symbol-placement is set to point, aligns icons east-west. When symbol-placement is set to line or line-center, aligns icon x-axes with the line.<br />
viewport - Produces icons whose x-axes are aligned with the x-axis of the viewport, regardless of the value of symbol-placement.<br />
auto - When symbol-placement is set to point, this is equivalent to viewport. When symbol-placement is set to line or line-center, this is equivalent to map.<br />

Requires

iconImage

Expression

Parameters: zoom

Name

iconSize

Description

Scales the original size of the icon by the provided factor. The new pixel size of the image will be the original pixel size multiplied by iconSize. 1 is the original size; 3 triples the size of the image.

Type

number

Default Value

1

Units

factor of the original icon size

Minimum

0

Requires

iconImage

Expression

Parameters: zoom, feature

Name

iconTextFit

Description

Scales the icon to fit around the associated text.

Type

enum

Default Value

none

Supported Values

none - The icon is displayed at its intrinsic aspect ratio.<br />
width - The icon is scaled in the x-dimension to fit the width of the text.<br />
height - The icon is scaled in the y-dimension to fit the height of the text.<br />
both - The icon is scaled in both x- and y-dimensions.<br />

Requires

iconImage, textField

Expression

Parameters: zoom

Name

iconTextFitPadding

Description

Size of the additional area added to dimensions determined by iconTextFit, in clockwise order: top, right, bottom, left.

Type

array<number>

Default Value

[0,0,0,0]

Units

pixels

Requires

iconImage, textField

Expression

Parameters: zoom

Name

iconImage

Description

Name of image in sprite to use for drawing an image background.

Type

string

Expression

Parameters: zoom, feature

Name

iconRotate

Description

Rotates the icon clockwise.

Type

number

Default Value

0

Units

degrees

Requires

iconImage

Expression

Parameters: zoom, feature

Name

iconPadding

Description

Size of the additional area around the icon bounding box used for detecting symbol collisions.

Type

number

Default Value

2

Units

pixels

Minimum

0

Requires

iconImage

Expression

Parameters: zoom

Name

iconKeepUpright

Description

If true, the icon may be flipped to prevent it from being rendered upsideDown.

Type

boolean

Default Value

false

Requires

iconImage

Expression

Parameters: zoom

Name

iconOffset

Description

Offset distance of icon from its anchor. Positive values indicate right and down, while negative values indicate left and up. Each component is multiplied by the value of iconSize to obtain the final offset in pixels. When combined with iconRotate the offset will be as if the rotated direction was up.

Type

array<number>

Default Value

[0,0]

Requires

iconImage

Expression

Parameters: zoom, feature

Name

iconAnchor

Description

Part of the icon placed closest to the anchor.

Type

enum

Default Value

center

Supported Values

center - The center of the icon is placed closest to the anchor.<br />
left - The left side of the icon is placed closest to the anchor.<br />
right - The right side of the icon is placed closest to the anchor.<br />
top - The top of the icon is placed closest to the anchor.<br />
bottom - The bottom of the icon is placed closest to the anchor.<br />
top-left - The top left corner of the icon is placed closest to the anchor.<br />
top-right - The top right corner of the icon is placed closest to the anchor.<br />
bottom-left - The bottom left corner of the icon is placed closest to the anchor.<br />
bottom-right - The bottom right corner of the icon is placed closest to the anchor.<br />

Requires

iconImage

Expression

Parameters: zoom, feature

Name

iconPitchAlignment

Description

Orientation of icon when map is pitched.

Type

enum

Default Value

auto

Supported Values

map - The icon is aligned to the plane of the map.<br />
viewport - The icon is aligned to the plane of the viewport.<br />
auto - Automatically matches the value of icon-rotation-alignment.<br />

Requires

iconImage

Expression

Parameters: zoom

Name

textPitchAlignment

Description

Orientation of text when map is pitched.

Type

enum

Default Value

auto

Supported Values

map - The text is aligned to the plane of the map.<br />
viewport - The text is aligned to the plane of the viewport.<br />
auto - Automatically matches the value of text-rotation-alignment.<br />

Requires

textField

Expression

Parameters: zoom

Name

textRotationAlignment

Description

In combination with symbolPlacement, determines the rotation behavior of the individual glyphs forming the text.

Type

enum

Default Value

auto

Supported Values

map - When symbol-placement is set to point, aligns text east-west. When symbol-placement is set to line or line-center, aligns text x-axes with the line.<br />
viewport - Produces glyphs whose x-axes are aligned with the x-axis of the viewport, regardless of the value of symbol-placement.<br />
auto - When symbol-placement is set to point, this is equivalent to viewport. When symbol-placement is set to line or line-center, this is equivalent to map.<br />

Requires

textField

Expression

Parameters: zoom

Name

textField

Description

Value to use for a text label. If a plain string is provided, it will be treated as a formatted with default/inherited formatting options.

Type

formatted

Default Value

``

Expression

Parameters: zoom, feature

Name

textFont

Description

Font stack to use for displaying text.

Type

array<string>

Default Value

[Open Sans Regular,Arial Unicode MS Regular]

Requires

textField

Supported Style Functions

camera

Expression

Parameters: zoom, feature

Name

textSize

Description

Font size.

Type

number

Default Value

16

Units

pixels

Minimum

0

Requires

textField

Expression

Parameters: zoom, feature

Name

textMaxWidth

Description

The maximum line width for text wrapping.

Type

number

Default Value

10

Units

ems

Minimum

0

Requires

textField

Supported Style Functions

camera

Expression

Parameters: zoom, feature

Name

textLineHeight

Description

Text leading value for multiLine text.

Type

number

Default Value

1.2

Units

ems

Requires

textField

Expression

Parameters: zoom

Name

textLetterSpacing

Description

Text tracking amount.

Type

number

Default Value

0

Units

ems

Requires

textField

Supported Style Functions

camera

Expression

Parameters: zoom, feature

Name

textJustify

Description

Text justification options.

Type

enum

Default Value

center

Supported Values

auto - The text is aligned towards the anchor position.<br />
left - The text is aligned to the left.<br />
center - The text is centered.<br />
right - The text is aligned to the right.<br />

Requires

textField

Supported Style Functions

camera

Expression

Parameters: zoom, feature

Name

textAnchor

Description

Part of the text placed closest to the anchor.

Type

enum

Default Value

center

Supported Values

center - The center of the text is placed closest to the anchor.<br />
left - The left side of the text is placed closest to the anchor.<br />
right - The right side of the text is placed closest to the anchor.<br />
top - The top of the text is placed closest to the anchor.<br />
bottom - The bottom of the text is placed closest to the anchor.<br />
top-left - The top left corner of the text is placed closest to the anchor.<br />
top-right - The top right corner of the text is placed closest to the anchor.<br />
bottom-left - The bottom left corner of the text is placed closest to the anchor.<br />
bottom-right - The bottom right corner of the text is placed closest to the anchor.<br />

Requires

textField

Supported Style Functions

camera

Expression

Parameters: zoom, feature

Name

textMaxAngle

Description

Maximum angle change between adjacent characters.

Type

number

Default Value

45

Units

degrees

Requires

textField

Expression

Parameters: zoom

Name

textRotate

Description

Rotates the text clockwise.

Type

number

Default Value

0

Units

degrees

Requires

textField

Expression

Parameters: zoom, feature

Name

textPadding

Description

Size of the additional area around the text bounding box used for detecting symbol collisions.

Type

number

Default Value

2

Units

pixels

Minimum

0

Requires

textField

Expression

Parameters: zoom

Name

textKeepUpright

Description

If true, the text may be flipped vertically to prevent it from being rendered upsideDown.

Type

boolean

Default Value

true

Requires

textField

Expression

Parameters: zoom

Name

textTransform

Description

Specifies how to capitalize text, similar to the CSS textTransform property.

Type

enum

Default Value

none

Supported Values

none - The text is not altered.<br />
uppercase - Forces all letters to be displayed in uppercase.<br />
lowercase - Forces all letters to be displayed in lowercase.<br />

Requires

textField

Expression

Parameters: zoom, feature

Name

textOffset

Description

Offset distance of text from its anchor. Positive values indicate right and down, while negative values indicate left and up.

Type

array<number>

Default Value

[0,0]

Units

ems

Requires

textField

Disabled By

textRadialOffset

Expression

Parameters: zoom, feature

Name

textAllowOverlap

Description

If true, the text will be visible even if it collides with other previously drawn symbols.

Type

boolean

Default Value

false

Requires

textField

Expression

Parameters: zoom

Name

textIgnorePlacement

Description

If true, other symbols can be visible even if they collide with the text.

Type

boolean

Default Value

false

Requires

textField

Expression

Parameters: zoom

Name

textOptional

Description

If true, icons will display without their corresponding text when the text collides with other symbols and the icon does not.

Type

boolean

Default Value

false

Requires

textField, iconImage

Expression

Parameters: zoom

Name

visibility

Description

Whether this layer is displayed.

Type

enum

Default Value

visible

Supported Values

visible - The layer is shown.<br />
none - The layer is not shown.<br />

Name

iconOpacity

Description

The opacity at which the icon will be drawn.

Type

number

Default Value

1

Minimum

0

Maximum

1

Requires

iconImage

Expression

Parameters: zoom, feature, feature-state

Name

iconColor

Description

The color of the icon. This can only be used with sdf icons.

Type

color

Default Value

#000000

Requires

iconImage

Expression

Parameters: zoom, feature, feature-state

Name

iconHaloColor

Description

The color of the icon's halo. Icon halos can only be used with SDF icons.

Type

color

Default Value

rgba(0, 0, 0, 0)

Requires

iconImage

Expression

Parameters: zoom, feature, feature-state

Name

iconHaloWidth

Description

Distance of halo to the icon outline.

Type

number

Default Value

0

Units

pixels

Minimum

0

Requires

iconImage

Expression

Parameters: zoom, feature, feature-state

Name

iconHaloBlur

Description

Fade out the halo towards the outside.

Type

number

Default Value

0

Units

pixels

Minimum

0

Requires

iconImage

Expression

Parameters: zoom, feature, feature-state

Name

iconTranslate

Description

Distance that the icon's anchor is moved from its original placement. Positive values indicate right and down, while negative values indicate left and up.

Type

array<number>

Default Value

[0,0]

Units

pixels

Requires

iconImage

Expression

Parameters: zoom

Name

iconTranslateAnchor

Description

Controls the frame of reference for iconTranslate.

Type

enum

Default Value

map

Supported Values

map - Icons are translated relative to the map.<br />
viewport - Icons are translated relative to the viewport.<br />

Requires

iconImage, iconTranslate

Expression

Parameters: zoom

Name

textOpacity

Description

The opacity at which the text will be drawn.

Type

number

Default Value

1

Minimum

0

Maximum

1

Requires

textField

Expression

Parameters: zoom, feature, feature-state

Name

textColor

Description

The color with which the text will be drawn.

Type

color

Default Value

#000000

Requires

textField

Expression

Parameters: zoom, feature, feature-state

Name

textHaloColor

Description

The color of the text's halo, which helps it stand out from backgrounds.

Type

color

Default Value

rgba(0, 0, 0, 0)

Requires

textField

Expression

Parameters: zoom, feature, feature-state

Name

textHaloWidth

Description

Distance of halo to the font outline. Max text halo width is 1/4 of the fontSize.

Type

number

Default Value

0

Units

pixels

Minimum

0

Requires

textField

Expression

Parameters: zoom, feature, feature-state

Name

textHaloBlur

Description

The halo's fadeout distance towards the outside.

Type

number

Default Value

0

Units

pixels

Minimum

0

Requires

textField

Expression

Parameters: zoom, feature, feature-state

Name

textTranslate

Description

Distance that the text's anchor is moved from its original placement. Positive values indicate right and down, while negative values indicate left and up.

Type

array<number>

Default Value

[0,0]

Units

pixels

Requires

textField

Expression

Parameters: zoom

Name

textTranslateAnchor

Description

Controls the frame of reference for textTranslate.

Type

enum

Default Value

map

Supported Values

map - The text is translated relative to the map.<br />
viewport - The text is translated relative to the viewport.<br />

Requires

textField, textTranslate

Expression

Parameters: zoom

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