83 lines
2.8 KiB
JavaScript
83 lines
2.8 KiB
JavaScript
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define([
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'../Core/defined',
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'../Core/defineProperties'
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], function(
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defined,
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defineProperties) {
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'use strict';
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/**
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* @private
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*/
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function Cesium3DTileStyleEngine() {
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this._style = undefined; // The style provided by the user
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this._styleDirty = false; // true when the style is reassigned
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this._lastStyleTime = 0; // The "time" when the last style was assigned
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}
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defineProperties(Cesium3DTileStyleEngine.prototype, {
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style : {
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get : function() {
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return this._style;
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},
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set : function(value) {
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this._style = value;
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this._styleDirty = true;
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}
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}
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});
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Cesium3DTileStyleEngine.prototype.makeDirty = function() {
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this._styleDirty = true;
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};
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Cesium3DTileStyleEngine.prototype.applyStyle = function(tileset, frameState) {
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if (!tileset.ready) {
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return;
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}
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if (defined(this._style) && !this._style.ready) {
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return;
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}
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var styleDirty = this._styleDirty;
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if (frameState.passes.render) {
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// Don't reset until the color pass, e.g., for mouse-over picking
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this._styleDirty = false;
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}
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if (styleDirty) {
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// Increase "time", so the style is applied to all visible tiles
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++this._lastStyleTime;
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}
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var lastStyleTime = this._lastStyleTime;
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var statistics = tileset._statistics;
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// If a new style was assigned, loop through all the visible tiles; otherwise, loop through
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// only the tiles that are newly visible, i.e., they are visible this frame, but were not
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// visible last frame. In many cases, the newly selected tiles list will be short or empty.
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var tiles = styleDirty ? tileset._selectedTiles : tileset._selectedTilesToStyle;
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// PERFORMANCE_IDEA: does mouse-over picking basically trash this? We need to style on
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// pick, for example, because a feature's show may be false.
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var length = tiles.length;
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for (var i = 0; i < length; ++i) {
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var tile = tiles[i];
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if (tile.lastStyleTime !== lastStyleTime) {
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// Apply the style to this tile if it wasn't already applied because:
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// 1) the user assigned a new style to the tileset
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// 2) this tile is now visible, but it wasn't visible when the style was first assigned
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var content = tile.content;
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tile.lastStyleTime = lastStyleTime;
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content.applyStyle(this._style);
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statistics.numberOfFeaturesStyled += content.featuresLength;
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++statistics.numberOfTilesStyled;
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}
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}
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};
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return Cesium3DTileStyleEngine;
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});
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