317 lines
8.3 KiB
JavaScript
317 lines
8.3 KiB
JavaScript
// FIXME test, especially polygons with holes and multipolygons
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// FIXME need to handle large thick features (where pixel size matters)
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goog.provide('ol.render.canvas.Immediate');
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goog.require('goog.asserts');
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goog.require('ol.color');
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goog.require('ol.extent');
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goog.require('ol.render.IRender');
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goog.require('ol.style.fill');
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goog.require('ol.style.stroke');
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/**
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* @constructor
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* @implements {ol.render.IRender}
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* @param {CanvasRenderingContext2D} context Context.
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* @param {ol.Extent} extent Extent.
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* @param {goog.vec.Mat4.AnyType} transform Transform.
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*/
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ol.render.canvas.Immediate = function(context, extent, transform) {
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/**
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* @private
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* @type {CanvasRenderingContext2D}
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*/
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this.context_ = context;
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/**
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* @private
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* @type {ol.Extent}
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*/
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this.extent_ = extent;
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/**
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* @private
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* @type {goog.vec.Mat4.AnyType}
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*/
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this.transform_ = transform;
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/**
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* @private
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* @type {{fillStyle: ol.style.Fill,
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* imageStyle: ol.style.Image,
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* strokeStyle: ol.style.Stroke}}
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*/
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this.state_ = {
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fillStyle: null,
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imageStyle: null,
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strokeStyle: null
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};
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/**
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* @private
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* @type {Array.<number>}
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*/
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this.pixelCoordinates_ = [];
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};
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/**
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* @param {ol.geom.Point|ol.geom.MultiPoint} geometry Geometry.
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* @private
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*/
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ol.render.canvas.Immediate.prototype.drawImages_ = function(geometry) {
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var context = this.context_;
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var imageStyle = this.state_.imageStyle;
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if (!ol.extent.intersects(this.extent_, geometry.getExtent()) ||
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!goog.isDefAndNotNull(imageStyle)) {
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return;
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}
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var pixelCoordinates = ol.geom.transformGeometry2D(
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geometry, this.transform_, this.pixelCoordinates_);
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var i, ii;
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for (i = 0, ii = pixelCoordinates.length; i < ii; i += 2) {
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var x = pixelCoordinates[i] - imageStyle.anchor[0];
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var y = pixelCoordinates[i + 1] - imageStyle.anchor[1];
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if (imageStyle.snapToPixel) {
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x = (x + 0.5) | 0;
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y = (y + 0.5) | 0;
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}
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context.drawImage(imageStyle.image, x, y);
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}
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};
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/**
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* @param {Array.<number>} pixelCoordinates Pixel coordinates.
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* @param {number} offset Offset.
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* @param {number} end End.
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* @param {boolean} close Close.
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* @private
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* @return {number} end End.
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*/
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ol.render.canvas.Immediate.prototype.moveToLineTo_ =
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function(pixelCoordinates, offset, end, close) {
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var context = this.context_;
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context.moveTo(pixelCoordinates[offset], pixelCoordinates[offset + 1]);
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var i;
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for (i = offset + 2; i < end; i += 2) {
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context.lineTo(pixelCoordinates[i], pixelCoordinates[i + 1]);
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}
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if (close) {
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context.lineTo(pixelCoordinates[offset], pixelCoordinates[offset + 1]);
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}
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return end;
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};
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/**
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* @param {Array.<number>} pixelCoordinates Pixel coordinates.
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* @param {number} offset Offset.
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* @param {Array.<number>} ends Ends.
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* @private
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* @return {number} End.
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*/
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ol.render.canvas.Immediate.prototype.drawRings_ =
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function(pixelCoordinates, offset, ends) {
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var context = this.context_;
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var i, ii;
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for (i = 0, ii = ends.length; i < ii; ++i) {
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offset = this.moveToLineTo_(pixelCoordinates, offset, ends[i], true);
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context.closePath(); // FIXME is this needed here?
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}
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return offset;
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};
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/**
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* @inheritDoc
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*/
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ol.render.canvas.Immediate.prototype.drawFeature = function(feature, style) {
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var geometry = feature.getGeometry();
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if (!ol.extent.intersects(this.extent_, geometry.getExtent())) {
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return;
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}
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this.setFillStrokeStyle(style.fill, style.stroke);
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this.setImageStyle(style.image);
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var renderGeometry =
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ol.render.canvas.Immediate.GEOMETRY_RENDERES_[geometry.getType()];
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goog.asserts.assert(goog.isDef(renderGeometry));
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renderGeometry.call(this, geometry);
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};
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/**
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* @inheritDoc
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*/
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ol.render.canvas.Immediate.prototype.drawPointGeometry =
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ol.render.canvas.Immediate.prototype.drawImages_;
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/**
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* @inheritDoc
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*/
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ol.render.canvas.Immediate.prototype.drawMultiPointGeometry =
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ol.render.canvas.Immediate.prototype.drawImages_;
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/**
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* @inheritDoc
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*/
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ol.render.canvas.Immediate.prototype.drawLineStringGeometry =
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function(lineStringGeometry) {
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if (!ol.extent.intersects(this.extent_, lineStringGeometry.getExtent()) ||
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!goog.isDefAndNotNull(this.state_.strokeStyle)) {
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return;
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}
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var context = this.context_;
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var pixelCoordinates = ol.geom.transformGeometry2D(
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lineStringGeometry, this.transform_, this.pixelCoordinates_);
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context.beginPath();
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this.moveToLineTo_(pixelCoordinates, 0, pixelCoordinates.length, false);
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context.stroke();
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};
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/**
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* @inheritDoc
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*/
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ol.render.canvas.Immediate.prototype.drawMultiLineStringGeometry =
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function(multiLineStringGeometry) {
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var geometryExtent = multiLineStringGeometry.getExtent();
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if (!ol.extent.intersects(this.extent_, geometryExtent) ||
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!goog.isDefAndNotNull(this.state_.strokeStyle)) {
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return;
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}
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var context = this.context_;
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var pixelCoordinates = ol.geom.transformGeometry2D(
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multiLineStringGeometry, this.transform_, this.pixelCoordinates_);
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context.beginPath();
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var ends = multiLineStringGeometry.getEnds();
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var offset = 0;
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var i, ii;
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for (i = 0, ii = ends.length; i < ii; ++i) {
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offset = this.moveToLineTo_(pixelCoordinates, offset, ends[i], false);
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}
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context.stroke();
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};
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/**
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* @inheritDoc
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*/
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ol.render.canvas.Immediate.prototype.drawPolygonGeometry =
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function(polygonGeometry) {
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if (!ol.extent.intersects(this.extent_, polygonGeometry.getExtent())) {
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return;
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}
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var state = this.state_;
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if (!goog.isDefAndNotNull(state.fillStyle) &&
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!goog.isDefAndNotNull(state.strokeStyle)) {
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return;
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}
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var context = this.context_;
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var pixelCoordinates = ol.geom.transformGeometry2D(
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polygonGeometry, this.transform_, this.pixelCoordinates_);
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var ends = polygonGeometry.getEnds();
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context.beginPath();
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this.drawRings_(pixelCoordinates, 0, ends);
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if (goog.isDefAndNotNull(state.fillStyle)) {
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context.fill();
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}
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if (goog.isDefAndNotNull(state.strokeStyle)) {
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context.stroke();
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}
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};
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/**
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* @inheritDoc
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*/
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ol.render.canvas.Immediate.prototype.drawMultiPolygonGeometry =
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function(multiPolygonGeometry) {
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if (!ol.extent.intersects(this.extent_, multiPolygonGeometry.getExtent())) {
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return;
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}
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var state = this.state_;
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if (!goog.isDefAndNotNull(state.fillStyle) &&
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!goog.isDefAndNotNull(state.strokeStyle)) {
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return;
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}
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var context = this.context_;
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var pixelCoordinates = ol.geom.transformGeometry2D(
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multiPolygonGeometry, this.transform_, this.pixelCoordinates_);
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var endss = multiPolygonGeometry.getEndss();
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var offset = 0;
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var i, ii;
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for (i = 0, ii = endss.length; i < ii; ++i) {
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var ends = endss[i];
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context.beginPath();
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offset = this.drawRings_(pixelCoordinates, offset, ends);
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if (goog.isDefAndNotNull(state.fillStyle)) {
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context.fill();
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}
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if (goog.isDefAndNotNull(state.strokeStyle)) {
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context.stroke();
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}
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}
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};
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/**
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* @inheritDoc
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*/
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ol.render.canvas.Immediate.prototype.setFillStrokeStyle =
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function(fillStyle, strokeStyle) {
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var context = this.context_;
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var state = this.state_;
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if (!ol.style.fill.equals(state.fillStyle, fillStyle)) {
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if (goog.isDefAndNotNull(fillStyle)) {
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context.fillStyle = ol.color.asString(fillStyle.color);
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}
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state.fillStyle = fillStyle;
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}
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if (!ol.style.stroke.equals(state.strokeStyle, strokeStyle)) {
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if (goog.isDefAndNotNull(strokeStyle)) {
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context.strokeStyle = ol.color.asString(strokeStyle.color);
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context.lineWidth = goog.isDef(strokeStyle.width) ? strokeStyle.width : 1;
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}
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state.strokeStyle = strokeStyle;
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}
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};
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/**
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* @inheritDoc
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*/
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ol.render.canvas.Immediate.prototype.setImageStyle = function(imageStyle) {
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this.state_.imageStyle = imageStyle;
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};
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/**
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* @inheritDoc
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*/
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ol.render.canvas.Immediate.prototype.setTextStyle = goog.abstractMethod;
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/**
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* @const
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* @private
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* @type {Object.<ol.geom.Type,
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* function(this: ol.render.canvas.Immediate, ol.geom.Geometry)>}
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*/
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ol.render.canvas.Immediate.GEOMETRY_RENDERES_ = {
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'Point': ol.render.canvas.Immediate.prototype.drawPointGeometry,
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'LineString': ol.render.canvas.Immediate.prototype.drawLineStringGeometry,
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'Polygon': ol.render.canvas.Immediate.prototype.drawPolygonGeometry,
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'MultiPoint': ol.render.canvas.Immediate.prototype.drawMultiPointGeometry,
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'MultiLineString':
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ol.render.canvas.Immediate.prototype.drawMultiLineStringGeometry,
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'MultiPolygon': ol.render.canvas.Immediate.prototype.drawMultiPolygonGeometry
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};
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