@arcgis/core/views/2d/tiling/TileStrategy.js

ArcGIS Maps SDK for JavaScript: A complete 2D and 3D mapping and data visualization API

/*
All material copyright ESRI, All Rights Reserved, unless otherwise specified.
See https://js.arcgis.com/4.33/esri/copyright.txt for details.
*/
import{create as e,contains as i}from"../../../geometry/support/aaBoundingRect.js";import t from"./TileCache.js";import s from"./TileCoverage.js";import l from"./TileKey.js";const o=new l(0,0,0,0),a=new Map,h=[],c=[];class r{constructor(e){this._previousScale=Number.POSITIVE_INFINITY,this.cachePolicy="keep",this.coveragePolicy="closest",this.resampling=!0,this.tileIndex=new Map,this.tiles=[],this.buffer=192,this.acquireTile=e.acquireTile,this.releaseTile=e.releaseTile,this.tileInfoView=e.tileInfoView,null!=e.resampling&&(this.resampling=e.resampling),e.cachePolicy&&(this.cachePolicy=e.cachePolicy),e.coveragePolicy&&(this.coveragePolicy=e.coveragePolicy),null!=e.buffer&&(this.buffer=e.buffer),e.cacheSize&&(this._tileCache=new t(e.cacheSize,this.tileInfoView,(e=>{this.releaseTile(e)})))}destroy(){this.tileIndex.clear()}update(e){const{resampling:i,tileIndex:t}=this,{scale:l,center:r,resolution:n}=e.state,{minScale:f,maxScale:d}=this.tileInfoView,u=!e.stationary&&l>this._previousScale;if(this._previousScale=l,!i&&(l>f||l<d))return this.tiles.length=0,void this.clear();const p=this.tileInfoView.getTileCoverage(e.state,this.buffer,this.resampling,this.coveragePolicy);if(!p)return this.tiles.length=0,void this.clear();const{spans:y,lodInfo:g}=p,{level:I}=g;this.tiles.length=0,t.forEach((e=>e.visible=!0));let v=0,m=0;if(y.length>0)for(const{row:s,colFrom:h,colTo:c}of y)for(let e=h;e<=c;e++){v++;const i=o.set(I,s,g.normalizeCol(e),g.getWorldForColumn(e)).id;let l=t.get(i);if(l)l.isReady?(a.set(i,l),m++):u||this._addParentTile(i,a);else{if(this._tileCache?.has(i)){if(l=this._tileCache.pop(i),this.tileIndex.set(i,l),l.isReady){a.set(i,l),m++;continue}}else l=this.acquireTile(o),this.tileIndex.set(i,l);u||this._addParentTile(i,a)}}const T=m===v;for(const[s,_]of t){if(a.has(s))continue;o.set(s);const e=this.tileInfoView.intersects(p,o),i="purge"===this.cachePolicy?o.level!==I:o.level>I;!e||!u&&T?!i&&e||h.push(_):_.isReady?i&&"purge"===this.cachePolicy&&this._hasReadyAncestor(o,I)?h.push(_):c.push(_):i&&h.push(_)}for(const s of c)s.isReady&&a.set(s.key.id,s);for(const s of h)this._tileCache?this._tileCache.add(s):this.releaseTile(s),t.delete(s.key.id);for(const s of a.values())this.tiles.push(s);for(const s of t.values())a.has(s.key.id)||(s.visible=!1);this._tileCache?.prune(I,r,n),s.pool.release(p),c.length=0,h.length=0,a.clear()}clear(){const{tileIndex:e}=this;for(const i of e.values())this.releaseTile(i);e.clear()}refresh(e){for(const i of this.tileIndex.values())e(i);this._tileCache?.clear()}updateCacheSize(e){this._tileCache&&(this._tileCache.maxSize=e)}_addParentTile(e,i){let t=e,s=null;for(;t=this.tileInfoView.getTileParentId(t),t;)if(this.tileIndex.has(t)){if(s=this.tileIndex.get(t),s?.isReady){i.has(s.key.id)||i.set(s.key.id,s);break}}else if(this._tileCache?.has(t)&&(s=this._tileCache.pop(t),this.tileIndex.set(t,s),s?.isReady)){i.has(s.key.id)||i.set(s.key.id,s);break}}_hasReadyAncestor(t,s){const l=e();this.tileInfoView.getTileBounds(l,t,!0);for(const o of this.tileIndex.values())if(o.isReady&&o.key.level>=s&&o.key.level<t.level){const t=e();if(this.tileInfoView.getTileBounds(t,o.key,!0),i(t,l))return!0}return!1}}export{r as default};