Namespace: render

ol.render


Classes

Event
Feature
VectorContext

Namespaces

canvas
webgl

Methods

ol.render.toContext(context, opt_options){ol.render.canvas.Immediate}

src/ol/render.js, line 28

Binds a Canvas Immediate API to a canvas context, to allow drawing geometries to the context's canvas.

The units for geometry coordinates are css pixels relative to the top left corner of the canvas element.

var canvas = document.createElement('canvas');
var render = ol.render.toContext(canvas.getContext('2d'),
    { size: [100, 100] });
render.setFillStrokeStyle(new ol.style.Fill({ color: blue }));
render.drawPolygon(
    new ol.geom.Polygon([[[0, 0], [100, 100], [100, 0], [0, 0]]]));
Name Type Description
context CanvasRenderingContext2D

Canvas context.

options

Options.

Name Type Description
size ol.Size | undefined

Desired size of the canvas in css pixels. When provided, both canvas and css size will be set according to the pixelRatio. If not provided, the current canvas and css sizes will not be altered.

pixelRatio number | undefined

Pixel ratio (canvas pixel to css pixel ratio) for the canvas. Default is the detected device pixel ratio.

Returns:
Canvas Immediate.