Layers
Layer is defined as the representation of data. It controls the map's visualization,without layers data will not be visible.
Layers contains all the layers avialable in the style JSON. The type property defines the type of layer and must have one of the following:
background
fill
line
symbol
raster
circle
fill-extrusion
heatmap
hillshade
*Note : Except for the type background all layers need a need a source as they get data from a source.
id
Required string
It is a unique identifier of the layer name.
paint
Optional object
Paint includes properties of background,fill,line,symbol,raster,fill-extrusion,circle,heatmap,hillshade.
source
Optional string
It defines the source to be used in the layer.It is mandatory for all layers except background.
source-layer
Optional string
It is used in the vector tile source.It is restricted to all other sources.
Layout properties
They define how data of the layer is passed to the GPU and they are enforced early in the rendering process.
Paint properties
Background
background-color
Optional paint
It defines the background color and its default value is "#000000".
background-opacity
Optional paint
It ranges between 0 and 1 and its default value is 1.
visibility
Optional layout
Its value is either "visible" or "none". It is responsible for whether the layer should be visible or not. Its default value is "visible".
Fill
fill-antialias
Optional paint
Whether or not the fill should be antialiased. Defaults to true.
fill-color
Optional paint
It defines the color of the filled part of the layer. and its default value is "#000000". The color value can be in rgba format.
fill-opacity
Optional paint
It ranges between 0 and 1 and its default value is 1. It defines the opacity of the filled layer.
Line
line-blur
Optional paint
Its value is 0 or greater than 0 and measured in pixels.
line-cap
Optional layout
It is a layout property and have the following values:
"butt" : A cap with a squared-off end which is drawn to the exact endpoint of the line.
"round" : A cap with a rounded end which is drawn beyond the endpoint of the line at a radius of one-half of the line's width and centered on the endpoint of the line.
"square" : A cap with a squared-off end which is drawn beyond the endpoint of the line at a distance of one-half of the line's width.
line-color
Optional paint
It defines the line color and its default value is "#000000".
line-dasharray
Optional paint
It consists of array of numbers 0 or greater than 0 and measured in widths.It defines the length of the dashes and gaps which ultimately form the dashed pattern.We can convert the length into pixels by multiplying the length with current width.Line pattern disable the line-dasharray.
line-gap-width
Optional paint
Its value can be 0 or greater than 0 and measured in pixels. It draws a line away from the actual path denoting the width of the inner gap.
line-join
Optional paint
It is a layout property and have the following values:
"bevel" : A join with a squared-off end which is drawn beyond the endpoint of the line at a distance of one-half of the line's width.
"round" : A join with a rounded end which is drawn beyond the endpoint of the line at a radius of one-half of the line's width and centered on the endpoint of the line.
"miter" : A join with a sharp, angled corner which is drawn with the outer sides beyond the endpoint of the path until they meet.
line-opacity
Optional paint
It ranges between 0 and 1 and its default value is 1.
line-width
Optional paint
Its value can be 0 or greater than 0 and measured in pixels. It defines the thickness of the stroke.
Circle
circle-blur
Optional paint
Its value is 0 or greater than 0 and measured in pixels.Value 1 will make the centerpoint at its full opacity.
circle-color
Optional paint
It defines the circle color and its default value is "#000000".
circle-opacity
Optional paint
It ranges between 0 and 1 and its default value is 1.
circle-radius
Optional paint
It defines the radius of the circle and its value is 0 or greater than 0 .Default is 5.
circle-stroke-color
Optional paint
It defines the stroke color of the circle and its default value is "#000000".
circle-stroke-color
Optional paint
It defines the stroke color of the circle and its default value is "#000000".
circle-stroke-opacity
Optional paint
It ranges between 0 and 1 and its default value is 1.Default value is 1.
circle-stroke-width
Optional paint
It is the width of the circle stroke and is value is 0 or greater than 0(measured in pixels).Default value is 0.
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