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canvasrenderer.js
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canvasrenderer.js
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goog.provide('ol.renderer.canvas');
goog.provide('ol.renderer.canvas.CanvasRenderer');
goog.require('goog.asserts');
goog.require('ol.Coordinate');
goog.require('ol.Pixel');
goog.require('ol.canvas');
goog.require('ol.geom.Geometry');
goog.require('ol.geom.Point');
goog.require('ol.renderer.Layer');
goog.require('ol.style.LiteralFill');
goog.require('ol.style.LiteralShape');
goog.require('ol.style.LiteralStroke');
goog.require('ol.style.LiteralSymbolizer');
/**
* @return {boolean} Is supported.
*/
ol.renderer.canvas.isSupported = ol.canvas.isSupported;
/**
* @constructor
*/
ol.renderer.canvas.CanvasRenderer = function() {
/**
* @type {CanvasRenderingContext2D}
* @private
*/
this.context_ = null;
/**
* @type {ol.renderer.Layer}
* @private
*/
this.layerRenderer_ = null;
/**
* @type {ol.Pixel}
* @private
*/
this.offset_ = null;
};
/**
* Confirm that we're ready to render.
* @private
*/
ol.renderer.canvas.CanvasRenderer.prototype.assertReady_ = function() {
goog.asserts.assert(!goog.isNull(this.context_),
'Call setTarget before rendering');
goog.asserts.assert(!goog.isNull(this.layerRenderer_),
'Call setLayerRenderer before rendering');
goog.asserts.assert(!goog.isNull(this.offset_),
'Call setOffset before rendering');
};
/**
* @param {ol.renderer.Layer} layerRenderer Layer renderer.
*/
ol.renderer.canvas.CanvasRenderer.prototype.setLayerRenderer =
function(layerRenderer) {
this.layerRenderer_ = layerRenderer;
};
/**
* @param {ol.Pixel} offset Pixel offset of top left corner of canvas.
*/
ol.renderer.canvas.CanvasRenderer.prototype.setOffset = function(offset) {
this.offset_ = offset;
};
/**
* @param {Element} canvas Target canvas element.
*/
ol.renderer.canvas.CanvasRenderer.prototype.setTarget = function(canvas) {
this.context_ = canvas.getContext('2d');
};
/**
* Render a geometry.
* @param {ol.geom.Geometry} geometry The geometry to render.
* @param {Array.<ol.style.LiteralSymbolizer>} symbolizers Symbolizers to render
* with.
* @private
*/
ol.renderer.canvas.CanvasRenderer.prototype.renderGeometry_ =
function(geometry, symbolizers) {
this.assertReady_();
if (geometry instanceof ol.geom.Point) {
this.renderPoint_(geometry, symbolizers);
} else {
// TODO: render other geometry types
goog.asserts.assert(false, 'Not yet implemented');
}
};
/**
* Render a point geometry.
* @param {ol.geom.Point} point Point geometry.
* @param {Array.<ol.style.LiteralSymbolizer>} symbolizers Symbolizers.
* @private
*/
ol.renderer.canvas.CanvasRenderer.prototype.renderPoint_ =
function(point, symbolizers) {
for (var i = 0, ii = symbolizers.length; i < ii; ++i) {
var symbolizer = symbolizers[i];
if (symbolizer instanceof ol.style.LiteralShape) {
if (symbolizer.type === ol.style.ShapeType.CIRCLE) {
this.renderPointCircle_(point, symbolizer);
} else {
this.renderPointShape_(point, symbolizer);
}
}
}
};
/**
* Render a point as a circle.
* @param {ol.geom.Point} point Point geometry.
* @param {ol.style.LiteralShape} symbolizer Shape symbolizer.
* @private
*/
ol.renderer.canvas.CanvasRenderer.prototype.renderPointCircle_ =
function(point, symbolizer) {
var coords = point.coordinates,
coordinate = new ol.Coordinate(coords[0], coords[1]),
mapRenderer = this.layerRenderer_.getMapRenderer(),
pixel = mapRenderer.getPixelFromCoordinate(coordinate),
px = pixel.x + this.offset_.x,
py = pixel.y + this.offset_.y,
twoPi = Math.PI * 2,
radius = symbolizer.size / 2,
/** @type {ol.style.LiteralFill} */
fill = symbolizer.fill,
/** @type {ol.style.LiteralStroke} */
stroke = symbolizer.stroke,
context = this.context_;
if (!goog.isNull(fill)) {
context.globalAlpha = fill.opacity;
context.fillStyle = fill.color;
context.beginPath();
context.arc(px, py, radius, 0, twoPi, true);
context.fill();
}
if (!goog.isNull(stroke)) {
context.globalAlpha = stroke.opacity;
context.strokeStyle = stroke.color;
context.lineWidth = stroke.width;
context.beginPath();
context.arc(px, py, radius, 0, twoPi, true);
context.stroke();
}
};
/**
* Render a point as a shape (other than circle).
* @param {ol.geom.Point} point Point geometry.
* @param {ol.style.LiteralShape} symbolizer Shape symbolizer.
* @private
*/
ol.renderer.canvas.CanvasRenderer.prototype.renderPointShape_ =
function(point, symbolizer) {
// TODO: other shape types
goog.asserts.assert(false, 'Not implemented');
};