ad62739a6e
In addition to using const and let, this also upgrades our linter config and removes lint (mostly whitespace).
47 lines
1.6 KiB
JavaScript
47 lines
1.6 KiB
JavaScript
/**
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* @module ol/render
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*/
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import _ol_has_ from './has.js';
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import _ol_transform_ from './transform.js';
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import CanvasImmediateRenderer from './render/canvas/Immediate.js';
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const _ol_render_ = {};
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/**
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* Binds a Canvas Immediate API to a canvas context, to allow drawing geometries
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* to the context's canvas.
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*
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* The units for geometry coordinates are css pixels relative to the top left
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* corner of the canvas element.
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* ```js
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* var canvas = document.createElement('canvas');
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* var render = ol.render.toContext(canvas.getContext('2d'),
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* { size: [100, 100] });
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* render.setFillStrokeStyle(new ol.style.Fill({ color: blue }));
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* render.drawPolygon(
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* new ol.geom.Polygon([[[0, 0], [100, 100], [100, 0], [0, 0]]]));
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* ```
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*
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* @param {CanvasRenderingContext2D} context Canvas context.
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* @param {olx.render.ToContextOptions=} opt_options Options.
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* @return {ol.render.canvas.Immediate} Canvas Immediate.
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* @api
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*/
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_ol_render_.toContext = function(context, opt_options) {
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const canvas = context.canvas;
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const options = opt_options ? opt_options : {};
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const pixelRatio = options.pixelRatio || _ol_has_.DEVICE_PIXEL_RATIO;
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const size = options.size;
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if (size) {
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canvas.width = size[0] * pixelRatio;
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canvas.height = size[1] * pixelRatio;
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canvas.style.width = size[0] + 'px';
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canvas.style.height = size[1] + 'px';
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}
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const extent = [0, 0, canvas.width, canvas.height];
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const transform = _ol_transform_.scale(_ol_transform_.create(), pixelRatio, pixelRatio);
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return new CanvasImmediateRenderer(context, pixelRatio, extent, transform,
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0);
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};
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export default _ol_render_;
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