528 lines
18 KiB
JavaScript
528 lines
18 KiB
JavaScript
/**
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* @module ol/renderer/canvas/VectorLayer
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*/
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import {getUid} from '../../util.js';
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import ViewHint from '../../ViewHint.js';
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import {createCanvasContext2D} from '../../dom.js';
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import {listen, unlisten} from '../../events.js';
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import EventType from '../../events/EventType.js';
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import rbush from 'rbush';
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import {buffer, createEmpty, containsExtent, getWidth} from '../../extent.js';
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import RenderEventType from '../../render/EventType.js';
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import {labelCache, rotateAtOffset} from '../../render/canvas.js';
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import CanvasReplayGroup from '../../render/canvas/ReplayGroup.js';
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import CanvasLayerRenderer from './Layer.js';
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import {defaultOrder as defaultRenderOrder, getTolerance as getRenderTolerance, getSquaredTolerance as getSquaredRenderTolerance, renderFeature} from '../vector.js';
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/**
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* @classdesc
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* Canvas renderer for vector layers.
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* @api
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*/
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class CanvasVectorLayerRenderer extends CanvasLayerRenderer {
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/**
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* @param {import("../../layer/Vector.js").default} vectorLayer Vector layer.
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*/
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constructor(vectorLayer) {
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super(vectorLayer);
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/**
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* Declutter tree.
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* @private
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*/
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this.declutterTree_ = vectorLayer.getDeclutter() ? rbush(9, undefined) : null;
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/**
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* @private
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* @type {boolean}
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*/
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this.dirty_ = false;
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/**
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* @private
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* @type {number}
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*/
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this.renderedRevision_ = -1;
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/**
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* @private
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* @type {number}
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*/
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this.renderedResolution_ = NaN;
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/**
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* @private
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* @type {import("../../extent.js").Extent}
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*/
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this.renderedExtent_ = createEmpty();
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/**
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* @private
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* @type {function(import("../../Feature.js").default, import("../../Feature.js").default): number|null}
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*/
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this.renderedRenderOrder_ = null;
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/**
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* @private
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* @type {import("../../render/canvas/ReplayGroup.js").default}
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*/
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this.replayGroup_ = null;
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/**
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* A new replay group had to be created by `prepareFrame()`
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* @type {boolean}
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*/
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this.replayGroupChanged = true;
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/**
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* @type {CanvasRenderingContext2D}
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*/
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this.context = createCanvasContext2D();
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const canvas = this.context.canvas;
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canvas.style.position = 'absolute';
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listen(labelCache, EventType.CLEAR, this.handleFontsChanged_, this);
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}
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/**
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* @inheritDoc
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*/
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disposeInternal() {
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unlisten(labelCache, EventType.CLEAR, this.handleFontsChanged_, this);
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super.disposeInternal();
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}
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/**
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* @param {CanvasRenderingContext2D} context Context.
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* @param {import("../../PluggableMap.js").FrameState} frameState Frame state.
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* @param {import("../../layer/Layer.js").State} layerState Layer state.
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*/
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compose(context, frameState, layerState) {
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const extent = frameState.extent;
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const pixelRatio = frameState.pixelRatio;
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const skippedFeatureUids = layerState.managed ?
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frameState.skippedFeatureUids : {};
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const viewState = frameState.viewState;
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const projection = viewState.projection;
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const rotation = viewState.rotation;
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const projectionExtent = projection.getExtent();
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const vectorSource = /** @type {import("../../source/Vector.js").default} */ (this.getLayer().getSource());
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let transform = this.getTransform(frameState, 0);
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// clipped rendering if layer extent is set
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const clipExtent = layerState.extent;
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const clipped = clipExtent !== undefined;
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if (clipped) {
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this.clip(context, frameState, /** @type {import("../../extent.js").Extent} */ (clipExtent));
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}
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const replayGroup = this.replayGroup_;
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if (replayGroup && !replayGroup.isEmpty()) {
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if (this.declutterTree_) {
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this.declutterTree_.clear();
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}
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const layer = /** @type {import("../../layer/Vector.js").default} */ (this.getLayer());
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let drawOffsetX = 0;
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let drawOffsetY = 0;
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let replayContext;
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const transparentLayer = layerState.opacity !== 1;
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const hasRenderListeners = layer.hasListener(RenderEventType.RENDER);
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if (transparentLayer || hasRenderListeners) {
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let drawWidth = context.canvas.width;
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let drawHeight = context.canvas.height;
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if (rotation) {
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const drawSize = Math.round(Math.sqrt(drawWidth * drawWidth + drawHeight * drawHeight));
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drawOffsetX = (drawSize - drawWidth) / 2;
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drawOffsetY = (drawSize - drawHeight) / 2;
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drawWidth = drawHeight = drawSize;
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}
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// resize and clear
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this.context.canvas.width = drawWidth;
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this.context.canvas.height = drawHeight;
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replayContext = this.context;
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} else {
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replayContext = context;
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}
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const alpha = replayContext.globalAlpha;
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if (!transparentLayer) {
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// for performance reasons, context.save / context.restore is not used
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// to save and restore the transformation matrix and the opacity.
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// see http://jsperf.com/context-save-restore-versus-variable
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replayContext.globalAlpha = layerState.opacity;
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}
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if (replayContext != context) {
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replayContext.translate(drawOffsetX, drawOffsetY);
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}
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const viewHints = frameState.viewHints;
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const snapToPixel = !(viewHints[ViewHint.ANIMATING] || viewHints[ViewHint.INTERACTING]);
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const width = frameState.size[0] * pixelRatio;
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const height = frameState.size[1] * pixelRatio;
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rotateAtOffset(replayContext, -rotation,
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width / 2, height / 2);
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replayGroup.replay(replayContext, transform, rotation, skippedFeatureUids, snapToPixel);
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if (vectorSource.getWrapX() && projection.canWrapX() &&
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!containsExtent(projectionExtent, extent)) {
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let startX = extent[0];
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const worldWidth = getWidth(projectionExtent);
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let world = 0;
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let offsetX;
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while (startX < projectionExtent[0]) {
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--world;
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offsetX = worldWidth * world;
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transform = this.getTransform(frameState, offsetX);
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replayGroup.replay(replayContext, transform, rotation, skippedFeatureUids, snapToPixel);
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startX += worldWidth;
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}
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world = 0;
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startX = extent[2];
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while (startX > projectionExtent[2]) {
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++world;
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offsetX = worldWidth * world;
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transform = this.getTransform(frameState, offsetX);
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replayGroup.replay(replayContext, transform, rotation, skippedFeatureUids, snapToPixel);
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startX -= worldWidth;
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}
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}
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rotateAtOffset(replayContext, rotation,
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width / 2, height / 2);
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if (hasRenderListeners) {
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this.dispatchRenderEvent(replayContext, frameState, transform);
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}
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if (replayContext != context) {
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if (transparentLayer) {
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const mainContextAlpha = context.globalAlpha;
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context.globalAlpha = layerState.opacity;
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context.drawImage(replayContext.canvas, -drawOffsetX, -drawOffsetY);
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context.globalAlpha = mainContextAlpha;
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} else {
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context.drawImage(replayContext.canvas, -drawOffsetX, -drawOffsetY);
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}
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replayContext.translate(-drawOffsetX, -drawOffsetY);
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}
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if (!transparentLayer) {
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replayContext.globalAlpha = alpha;
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}
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}
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if (clipped) {
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context.restore();
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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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composeFrame(frameState, layerState, context) {
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const transform = this.getTransform(frameState, 0);
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this.preCompose(context, frameState, transform);
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this.compose(context, frameState, layerState);
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this.postCompose(context, frameState, layerState, transform);
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}
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/**
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* @param {import("../../PluggableMap.js").FrameState} frameState Frame state.
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* @param {import("../../layer/Layer.js").State} layerState Layer state.
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*/
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render(frameState, layerState) {
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const replayGroup = this.replayGroup_;
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if (!replayGroup || replayGroup.isEmpty()) {
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return;
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}
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const context = this.context;
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const canvas = context.canvas;
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const extent = frameState.extent;
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const pixelRatio = frameState.pixelRatio;
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const viewState = frameState.viewState;
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const projection = viewState.projection;
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const rotation = viewState.rotation;
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const projectionExtent = projection.getExtent();
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const vectorSource = /** @type {import("../../source/Vector.js").default} */ (this.getLayer().getSource());
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// clipped rendering if layer extent is set
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const clipExtent = layerState.extent;
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const clipped = clipExtent !== undefined;
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if (clipped) {
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this.clip(context, frameState, /** @type {import("../../extent.js").Extent} */ (clipExtent));
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}
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if (this.declutterTree_) {
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this.declutterTree_.clear();
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}
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// resize and clear
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let width = Math.round(frameState.size[0] * pixelRatio);
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let height = Math.round(frameState.size[1] * pixelRatio);
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if (rotation) {
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const size = Math.round(Math.sqrt(width * width + height * height));
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width = height = size;
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}
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if (canvas.width != width || canvas.height != height) {
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canvas.width = width;
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canvas.height = height;
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canvas.style.width = (width / pixelRatio) + 'px';
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canvas.style.height = (height / pixelRatio) + 'px';
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} else {
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context.clearRect(0, 0, width, height);
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}
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const viewHints = frameState.viewHints;
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const snapToPixel = !(viewHints[ViewHint.ANIMATING] || viewHints[ViewHint.INTERACTING]);
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let transform = this.getRenderTransform(frameState, width, height, 0);
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const skippedFeatureUids = layerState.managed ? frameState.skippedFeatureUids : {};
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replayGroup.replay(context, transform, rotation, skippedFeatureUids, snapToPixel);
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if (vectorSource.getWrapX() && projection.canWrapX() && !containsExtent(projectionExtent, extent)) {
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let startX = extent[0];
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const worldWidth = getWidth(projectionExtent);
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let world = 0;
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let offsetX;
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while (startX < projectionExtent[0]) {
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--world;
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offsetX = worldWidth * world;
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transform = this.getRenderTransform(frameState, width, height, offsetX);
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replayGroup.replay(context, transform, rotation, skippedFeatureUids, snapToPixel);
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startX += worldWidth;
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}
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world = 0;
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startX = extent[2];
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while (startX > projectionExtent[2]) {
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++world;
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offsetX = worldWidth * world;
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transform = this.getRenderTransform(frameState, width, height, offsetX);
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replayGroup.replay(context, transform, rotation, skippedFeatureUids, snapToPixel);
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startX -= worldWidth;
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}
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}
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if (this.getLayer().hasListener(RenderEventType.RENDER)) {
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this.dispatchRenderEvent(context, frameState, transform);
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}
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if (clipped) {
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context.restore();
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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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renderFrame(frameState, layerState) {
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this.preRender(frameState);
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this.render(frameState, layerState);
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this.postRender(frameState, layerState);
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const canvas = this.context.canvas;
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const opacity = layerState.opacity;
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if (opacity !== canvas.style.opacity) {
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canvas.style.opacity = opacity;
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}
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const rotation = frameState.viewState.rotation;
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const transform = 'rotate(' + rotation + 'rad)';
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if (transform !== canvas.style.transform) {
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canvas.style.transform = transform;
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}
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return canvas;
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}
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/**
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* @inheritDoc
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*/
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forEachFeatureAtCoordinate(coordinate, frameState, hitTolerance, callback, thisArg) {
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if (!this.replayGroup_) {
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return undefined;
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} else {
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const resolution = frameState.viewState.resolution;
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const rotation = frameState.viewState.rotation;
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const layer = /** @type {import("../../layer/Vector.js").default} */ (this.getLayer());
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/** @type {!Object<string, boolean>} */
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const features = {};
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const result = this.replayGroup_.forEachFeatureAtCoordinate(coordinate, resolution, rotation, hitTolerance, {},
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/**
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* @param {import("../../Feature.js").FeatureLike} feature Feature.
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* @return {?} Callback result.
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*/
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function(feature) {
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const key = getUid(feature);
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if (!(key in features)) {
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features[key] = true;
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return callback.call(thisArg, feature, layer);
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}
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}, null);
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return result;
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}
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}
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/**
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* @param {import("../../events/Event.js").default} event Event.
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*/
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handleFontsChanged_(event) {
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const layer = this.getLayer();
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if (layer.getVisible() && this.replayGroup_) {
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layer.changed();
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}
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}
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/**
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* Handle changes in image style state.
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* @param {import("../../events/Event.js").default} event Image style change event.
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* @private
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*/
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handleStyleImageChange_(event) {
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this.renderIfReadyAndVisible();
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}
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/**
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* @inheritDoc
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*/
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prepareFrame(frameState, layerState) {
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const vectorLayer = /** @type {import("../../layer/Vector.js").default} */ (this.getLayer());
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const vectorSource = /** @type {import("../../source/Vector.js").default} */ (vectorLayer.getSource());
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const animating = frameState.viewHints[ViewHint.ANIMATING];
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const interacting = frameState.viewHints[ViewHint.INTERACTING];
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const updateWhileAnimating = vectorLayer.getUpdateWhileAnimating();
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const updateWhileInteracting = vectorLayer.getUpdateWhileInteracting();
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if (!this.dirty_ && (!updateWhileAnimating && animating) ||
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(!updateWhileInteracting && interacting)) {
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return true;
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}
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const frameStateExtent = frameState.extent;
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const viewState = frameState.viewState;
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const projection = viewState.projection;
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const resolution = viewState.resolution;
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const pixelRatio = frameState.pixelRatio;
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const vectorLayerRevision = vectorLayer.getRevision();
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const vectorLayerRenderBuffer = vectorLayer.getRenderBuffer();
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let vectorLayerRenderOrder = vectorLayer.getRenderOrder();
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if (vectorLayerRenderOrder === undefined) {
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vectorLayerRenderOrder = defaultRenderOrder;
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}
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const extent = buffer(frameStateExtent,
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vectorLayerRenderBuffer * resolution);
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const projectionExtent = viewState.projection.getExtent();
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if (vectorSource.getWrapX() && viewState.projection.canWrapX() &&
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!containsExtent(projectionExtent, frameState.extent)) {
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// For the replay group, we need an extent that intersects the real world
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// (-180° to +180°). To support geometries in a coordinate range from -540°
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// to +540°, we add at least 1 world width on each side of the projection
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// extent. If the viewport is wider than the world, we need to add half of
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// the viewport width to make sure we cover the whole viewport.
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const worldWidth = getWidth(projectionExtent);
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const gutter = Math.max(getWidth(extent) / 2, worldWidth);
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extent[0] = projectionExtent[0] - gutter;
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extent[2] = projectionExtent[2] + gutter;
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}
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if (!this.dirty_ &&
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this.renderedResolution_ == resolution &&
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this.renderedRevision_ == vectorLayerRevision &&
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this.renderedRenderOrder_ == vectorLayerRenderOrder &&
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containsExtent(this.renderedExtent_, extent)) {
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this.replayGroupChanged = false;
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return true;
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}
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this.replayGroup_ = null;
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this.dirty_ = false;
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const replayGroup = new CanvasReplayGroup(
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getRenderTolerance(resolution, pixelRatio), extent, resolution,
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pixelRatio, vectorSource.getOverlaps(), this.declutterTree_, vectorLayer.getRenderBuffer());
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vectorSource.loadFeatures(extent, resolution, projection);
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/**
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* @param {import("../../Feature.js").default} feature Feature.
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* @this {CanvasVectorLayerRenderer}
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*/
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const render = function(feature) {
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let styles;
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const styleFunction = feature.getStyleFunction() || vectorLayer.getStyleFunction();
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if (styleFunction) {
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styles = styleFunction(feature, resolution);
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}
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if (styles) {
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const dirty = this.renderFeature(
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feature, resolution, pixelRatio, styles, replayGroup);
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this.dirty_ = this.dirty_ || dirty;
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}
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}.bind(this);
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if (vectorLayerRenderOrder) {
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/** @type {Array<import("../../Feature.js").default>} */
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const features = [];
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vectorSource.forEachFeatureInExtent(extent,
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/**
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* @param {import("../../Feature.js").default} feature Feature.
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*/
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function(feature) {
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features.push(feature);
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});
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features.sort(vectorLayerRenderOrder);
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for (let i = 0, ii = features.length; i < ii; ++i) {
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render(features[i]);
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}
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} else {
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vectorSource.forEachFeatureInExtent(extent, render);
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}
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replayGroup.finish();
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this.renderedResolution_ = resolution;
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this.renderedRevision_ = vectorLayerRevision;
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this.renderedRenderOrder_ = vectorLayerRenderOrder;
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this.renderedExtent_ = extent;
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this.replayGroup_ = replayGroup;
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this.replayGroupChanged = true;
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return true;
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}
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/**
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* @param {import("../../Feature.js").default} feature Feature.
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* @param {number} resolution Resolution.
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* @param {number} pixelRatio Pixel ratio.
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* @param {import("../../style/Style.js").default|Array<import("../../style/Style.js").default>} styles The style or array of styles.
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* @param {import("../../render/canvas/ReplayGroup.js").default} replayGroup Replay group.
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* @return {boolean} `true` if an image is loading.
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*/
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renderFeature(feature, resolution, pixelRatio, styles, replayGroup) {
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if (!styles) {
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return false;
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}
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let loading = false;
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if (Array.isArray(styles)) {
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for (let i = 0, ii = styles.length; i < ii; ++i) {
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loading = renderFeature(
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replayGroup, feature, styles[i],
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getSquaredRenderTolerance(resolution, pixelRatio),
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this.handleStyleImageChange_, this) || loading;
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}
|
|
} else {
|
|
loading = renderFeature(
|
|
replayGroup, feature, styles,
|
|
getSquaredRenderTolerance(resolution, pixelRatio),
|
|
this.handleStyleImageChange_, this);
|
|
}
|
|
return loading;
|
|
}
|
|
}
|
|
|
|
|
|
export default CanvasVectorLayerRenderer;
|