-
Notifications
You must be signed in to change notification settings - Fork 284
/
TiledLayer.ts
executable file
·218 lines (190 loc) · 6.3 KB
/
TiledLayer.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
import Camera from '../Camera';
import Utils = require('../Utils');
import TileGrid from '../TileGrid';
import Kernel = require('../Kernel');
import Extent = require('../Extent');
import Tile = require("../graphics/Tile");
import GraphicGroup = require('../GraphicGroup');
import SubTiledLayer = require('./SubTiledLayer');
abstract class TiledLayer extends GraphicGroup<SubTiledLayer> {
readonly imageRequestOptimizeDeltaLevel = 2;
constructor(protected style: string = "") {
super();
//添加第0级的子图层
var subLayer0 = new SubTiledLayer(0);
this.add(subLayer0);
//要对level为1的图层进行特殊处理,在创建level为1时就创建其中的全部的四个tile
var subLayer1 = new SubTiledLayer(1);
this.add(subLayer1);
for (var m = 0; m <= 1; m++) {
for (var n = 0; n <= 1; n++) {
var args = {
level: 1,
row: m,
column: n,
url: ""
};
args.url = this.getTileUrl(args.level, args.row, args.column);
var tile = Tile.getInstance(args.level, args.row, args.column, args.url);
subLayer1.add(tile);
}
}
}
refresh() {
var globe = Kernel.globe;
var camera = globe.camera;
var level = globe.getLevel();
var options = {
threshold: 1
};
var pitch = camera.getPitch();
options.threshold = 1;// options.threshold = Math.min(90 / (90 - pitch), 1.5);
//最大级别的level所对应的可见TileGrids
var lastLevelTileGrids = camera.getVisibleTilesByLevel(level, options);
// this.updateSubLayerCount();
var levelsTileGrids: TileGrid[][] = [];
var parentTileGrids = lastLevelTileGrids;
var subLevel: number;
for (subLevel = level; subLevel >= 2; subLevel--) {
levelsTileGrids[subLevel] = parentTileGrids;//此行代码表示第subLevel层级的可见切片
parentTileGrids = parentTileGrids.map(function (item) {
return item.getParent();
});
parentTileGrids = Utils.filterRepeatArray(parentTileGrids);
}
for (subLevel = 2; subLevel <= level; subLevel++) {
var addNew = level === subLevel || (level - subLevel) > this.imageRequestOptimizeDeltaLevel;
this.children[subLevel].updateTiles(subLevel, levelsTileGrids[subLevel], addNew);
}
// this.updateTileVisibility();
}
//根据传入的level更新SubTiledLayer的数量
updateSubLayerCount() {
var level: number = Kernel.globe.getLevel();
var subLayerCount = this.children.length;
var deltaLevel = level + 1 - subLayerCount;
var i: number, subLayer: SubTiledLayer;
if (deltaLevel > 0) {
//需要增加子图层
for (i = 0; i < deltaLevel; i++) {
subLayer = new SubTiledLayer(i + subLayerCount);
this.add(subLayer);
}
} else if (deltaLevel < 0) {
//需要删除多余的子图层
deltaLevel *= -1;
for (i = 0; i < deltaLevel; i++) {
var removeLevel = this.children.length - 1;
//第0级和第1级不删除
if (removeLevel >= 2) {
subLayer = this.children[removeLevel];
this.remove(subLayer);
} else {
break;
}
}
}
}
private _getReadyTile(tileGrid: TileGrid): Tile{
var level = tileGrid.level;
var row = tileGrid.row;
var column = tileGrid.column;
var tile = this.children[level].findTile(level, row, column);
if(level === 1){
return tile;
}else{
if(tile && tile.isReady()){
return tile;
}else{
return this._getReadyTile(tileGrid.getParent());
}
}
}
updateTileVisibility() {
var globe = Kernel.globe;
var level = globe.getLevel();
this.children.forEach((subTiledLayer) => {
subTiledLayer.showAllTiles();
});
var ancesorLevel = level - this.imageRequestOptimizeDeltaLevel - 1;
if(ancesorLevel >= 1){
var camera = Kernel.globe.camera;
var tileGrids = camera.getTileGridsOfBoundary(ancesorLevel, false);
if(tileGrids.length === 8){
tileGrids = Utils.filterRepeatArray(tileGrids);
for(var i: number = 0; i <= ancesorLevel; i++){
this.children[i].hideAllTiles();
}
tileGrids.forEach((tileGrid) => {
var tile = this._getReadyTile(tileGrid);
if(tile){
tile.setVisible(true);
tile.parent.visible = true;
}
});
}
}
}
onDraw(camera: Camera) {
var program = Tile.findProgram();
if (!program) {
return;
}
program.use();
var gl = Kernel.gl;
//设置uniform变量的值
//uPMVMatrix
var pmvMatrix = camera.getProjViewMatrixForDraw();
var locPMVMatrix = program.getUniformLocation('uPMVMatrix');
gl.uniformMatrix4fv(locPMVMatrix, false, pmvMatrix.getFloat32Array());
//uSampler
gl.activeTexture(gl.TEXTURE0);
var locSampler = program.getUniformLocation('uSampler');
gl.uniform1i(locSampler, 0);
//此处将深度测试设置为ALWAYS是为了解决两个不同层级的切片在拖动时一起渲染会导致屏闪的问题
gl.depthFunc(gl.ALWAYS);
super.onDraw(camera);
//将深度测试恢复成LEQUAL
gl.depthFunc(gl.LEQUAL);
}
getExtent(level?: number) {
var extents = this.getExtents(level);
return Extent.union(extents);
}
getExtents(level?: number): Extent[] {
if (!(level >= 0 && level <= (this.children.length - 1))) {
level = this.children.length - 1 - 3;
}
var subTiledLayer = this.children[level];
if (subTiledLayer) {
return subTiledLayer.getExtents();
}
return [];
}
protected wrapUrlWithProxy(url: string): string {
return Utils.wrapUrlWithProxy(url);
}
getLastLevelVisibleTileGrids(){
var tileGrids: TileGrid[] = null;
var subTiledLayer = this.children[this.children.length - 1];
if(subTiledLayer){
tileGrids = subTiledLayer.getVisibleTileGrids();
}
return tileGrids;
}
abstract getTileUrl(level: number, row: number, column: number): string
logVisibleTiles() {
var result: any[] = [];
this.children.forEach((subLayer) => {
var allCount = subLayer.children.length;
var visibleCount = subLayer.getShouldDrawTilesCount();
result.push({
level: subLayer.getLevel(),
allCount: allCount,
visibleCount: visibleCount
});
});
console.table(result);
}
}
export = TiledLayer;