Leaflet.glify

web gl renderer plugin for leaflet

Pronounced leaflet-G.L.-Ify, or leaflet-glify, or L.-G.L.-Ify, or L-glify, or elglify

inspired by http://bl.ocks.org/Sumbera/c6fed35c377a46ff74c3 & need.

Objective

• To provide a means of rendering a massive amount of data visually in a way that does not degrade user experience
• Remaining as simple as possible with current fastest libs
• Providing the same sort of user experience one would get using standard html and elements

Simple Polygon Usage

L.glify.shapes({
  map: map,
  data: geoJson,
  click: function(e, feature) {
    //do something when a shape is clicked
  }
});

Simple Points Usage

L.glify.points({
  map: map,
  data: points,
  click: function(e, point, xy) {
    //do something when a point is clicked
  }
});

Simple Lines Usage

L.glify.lines({
  map: map,
  data: geojson,
  size: 2,
  click: function(e, feature, xy) {
    //do something when a line is clicked
  }
});

L.glify.shapes Options

• map {Object} required leaflet map
• data {Object} required geojson data
• vertexShaderSource {String|Function} optional glsl vertex shader source, defaults to use L.glify.shader.vertex
• fragmentShaderSource {String|Function} optional glsl fragment shader source, defaults to use L.glify.shader.fragment.polygon
• click {Function} optional event handler for clicking a shape
• color {Function|Object|String} optional, default is 'random'
  • When color is a Function its arguments are gets the index:number, and the feature:object that is being colored
• opacity {Number} a value from 0 to 1, default is 0.5
• className {String} a class name applied to canvas, default is ''
• preserveDrawingBuffer {Boolean} optional, default false, perverse draw buffer on webgl context.
  • CAUTION: May cause performance issue with large data sets.

L.glify.points Options

• map {Object} required leaflet map
• data {Object} required geojson data
• vertexShaderSource {String|Function} optional glsl vertex shader source, defaults to use L.glify.shader.vertex
• fragmentShaderSource {String|Function} optional glsl fragment shader source, defaults to use L.glify.shader.fragment.point
• click {Function} optional event handler for clicking a point
• color {Function|Object|String} optional, default is 'random'
  • When color is a Function its arguments are gets the index:number, and the point:array that is being colored
• opacity {Number} a value from 0 to 1, default is 0.8
• className {String} a class name applied to canvas, default is ''
• size {Number|Function} pixel size of point
  • When size is a Function its arguments are index:number, and the point:array that is being sized
• sensitivity {Number} exaggerates the size of the clickable area to make it easier to click a point
• preserveDrawingBuffer {Boolean} optional, default false, perverse draw buffer on webgl context.
  • CAUTION: May cause performance issue with large data sets.
• isCentimetric {Boolean} optional, default false, uses a vertex shader with double precision to allow precise position for points at high zoom levels. Needed above zoom level 19 to avoid jittering and points snapped on a grid.

L.glify.lines Options

• map {Object} required leaflet map
• data {Object} required geojson data
• vertexShaderSource {String|Function} optional glsl vertex shader source, defaults to use L.glify.shader.vertex
• fragmentShaderSource {String|Function} optional glsl fragment shader source, defaults to use L.glify.shader.fragment.point
• click {Function} optional event handler for clicking a point
• color {Function|Object|String} optional, default is 'random'
  • When color is a Function its arguments are gets the index:number, and the point:array that is being colored
• opacity {Number} a value from 0 to 1, default is 0.5
• className {String} a class name applied to canvas, default is ''
• preserveDrawingBuffer {Boolean} optional, default false, perverse draw buffer on webgl context.
  • CAUTION: May cause performance issue with large data sets.
• weight {Number|Function} a value in pixels of how thick lines should be drawn
  • When weight is a Function its arguments are gets the index:number, and the feature:object that is being drawn
  • CAUTION: Zoom of more than 18 will turn weight internally to 1 to prevent WebGL precision rendering issues.

L.glify methods

• longitudeFirst()
• latitudeFirst()
• instances
• points(options)
• shapes(options)
• flattenData(data)

Roadmap

Soon to come: limitless styles.

Contributors

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