Examples
Layers (32)
Display buildings in 3DExtrude polygons for 3D indoor mappingAdd a 3D modelAdjust a layer's opacityAnimate a lineAnimate a series of imagesAnimate a pointChange building color based on zoom levelChange the case of labelsDisplay HTML clusters with custom propertiesCreate and style clustersChange a layer's color with buttonsAdd a custom style layerStyle circles with a data-driven propertyStyle lines with a data-driven propertyDisplay and style rich text labelsUse a fallback imageAdd a pattern to a polygonAdd a new layer below labelsAdd a GeoJSON lineDraw GeoJSON pointsAdd hillshadingCreate a heatmap layerCreate a gradient line using an expressionAdd multiple geometries from one GeoJSON sourceStyle ocean depth dataShow and hide layersUpdate a choropleth layer by zoom levelChange worldview of administrative boundariesVariable label placementVisualize population densityAdd a GeoJSON polygon

Add a custom style layer

Use a custom style layer to render custom WebGL content.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Add a custom style layer</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://api.mapbox.com/mapbox-gl-js/v1.6.1/mapbox-gl.js"></script>
<link href="https://api.mapbox.com/mapbox-gl-js/v1.6.1/mapbox-gl.css" rel="stylesheet" />
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; };
</style>
</head>
<body>
<div id="map"></div>
<script>
mapboxgl.accessToken = '<your access token here>';
var map = (window.map = new mapboxgl.Map({
container: 'map',
zoom: 3,
center: [7.5, 58],
style: 'mapbox://styles/mapbox/light-v10',
antialias: true // create the gl context with MSAA antialiasing, so custom layers are antialiased
}));
// create a custom style layer to implement the WebGL content
var highlightLayer = {
id: 'highlight',
type: 'custom',
// method called when the layer is added to the map
// https://docs.mapbox.com/mapbox-gl-js/api/#styleimageinterface#onadd
onAdd: function(map, gl) {
// create GLSL source for vertex shader
var vertexSource =
'' +
'uniform mat4 u_matrix;' +
'attribute vec2 a_pos;' +
'void main() {' +
' gl_Position = u_matrix * vec4(a_pos, 0.0, 1.0);' +
'}';
// create GLSL source for fragment shader
var fragmentSource =
'' +
'void main() {' +
' gl_FragColor = vec4(1.0, 0.0, 0.0, 0.5);' +
'}';
// create a vertex shader
var vertexShader = gl.createShader(gl.VERTEX_SHADER);
gl.shaderSource(vertexShader, vertexSource);
gl.compileShader(vertexShader);
// create a fragment shader
var fragmentShader = gl.createShader(gl.FRAGMENT_SHADER);
gl.shaderSource(fragmentShader, fragmentSource);
gl.compileShader(fragmentShader);
// link the two shaders into a WebGL program
this.program = gl.createProgram();
gl.attachShader(this.program, vertexShader);
gl.attachShader(this.program, fragmentShader);
gl.linkProgram(this.program);
this.aPos = gl.getAttribLocation(this.program, 'a_pos');
// define vertices of the triangle to be rendered in the custom style layer
var helsinki = mapboxgl.MercatorCoordinate.fromLngLat({
lng: 25.004,
lat: 60.239
});
var berlin = mapboxgl.MercatorCoordinate.fromLngLat({
lng: 13.403,
lat: 52.562
});
var kyiv = mapboxgl.MercatorCoordinate.fromLngLat({
lng: 30.498,
lat: 50.541
});
// create and initialize a WebGLBuffer to store vertex and color data
this.buffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, this.buffer);
gl.bufferData(
gl.ARRAY_BUFFER,
new Float32Array([
helsinki.x,
helsinki.y,
berlin.x,
berlin.y,
kyiv.x,
kyiv.y
]),
gl.STATIC_DRAW
);
},
// method fired on each animation frame
// https://docs.mapbox.com/mapbox-gl-js/api/#map.event:render
render: function(gl, matrix) {
gl.useProgram(this.program);
gl.uniformMatrix4fv(
gl.getUniformLocation(this.program, 'u_matrix'),
false,
matrix
);
gl.bindBuffer(gl.ARRAY_BUFFER, this.buffer);
gl.enableVertexAttribArray(this.aPos);
gl.vertexAttribPointer(this.aPos, 2, gl.FLOAT, false, 0, 0);
gl.enable(gl.BLEND);
gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 3);
}
};
// add the custom style layer to the map
map.on('load', function() {
map.addLayer(highlightLayer, 'building');
});
</script>
</body>
</html>
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