QGIS API Documentation 3.27.0-Master (a46f227e17)
qgschunkloader_p.cpp
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1/***************************************************************************
2 qgschunkloader_p.cpp
3 --------------------------------------
4 Date : October 2020
5 Copyright : (C) 2020 by Martin Dobias
6 Email : wonder dot sk at gmail dot com
7 ***************************************************************************
8 * *
9 * This program is free software; you can redistribute it and/or modify *
10 * it under the terms of the GNU General Public License as published by *
11 * the Free Software Foundation; either version 2 of the License, or *
12 * (at your option) any later version. *
13 * *
14 ***************************************************************************/
15
16#include "qgschunkloader_p.h"
17
18#include "qgschunknode_p.h"
19#include <QVector>
21
22QgsQuadtreeChunkLoaderFactory::QgsQuadtreeChunkLoaderFactory() = default;
23
24QgsQuadtreeChunkLoaderFactory::~QgsQuadtreeChunkLoaderFactory() = default;
25
26void QgsQuadtreeChunkLoaderFactory::setupQuadtree( const QgsAABB &rootBbox, float rootError, int maxLevel )
27{
28 mRootBbox = rootBbox;
29 mRootError = rootError;
30 mMaxLevel = maxLevel;
31}
32
33QgsChunkNode *QgsQuadtreeChunkLoaderFactory::createRootNode() const
34{
35 return new QgsChunkNode( QgsChunkNodeId( 0, 0, 0 ), mRootBbox, mRootError );
36}
37
38QVector<QgsChunkNode *> QgsQuadtreeChunkLoaderFactory::createChildren( QgsChunkNode *node ) const
39{
40 QVector<QgsChunkNode *> children;
41
42 if ( node->level() >= mMaxLevel )
43 return children;
44
45 const QgsChunkNodeId nodeId = node->tileId();
46 const float childError = node->error() / 2;
47 const QgsAABB bbox = node->bbox();
48 float xc = bbox.xCenter(), zc = bbox.zCenter();
49
50 for ( int i = 0; i < 4; ++i )
51 {
52 int dx = i & 1, dy = !!( i & 2 );
53 const QgsChunkNodeId childId( nodeId.d + 1, nodeId.x * 2 + dx, nodeId.y * 2 + ( dy ? 0 : 1 ) ); // TODO: inverse dy?
54 // the Y and Z coordinates below are intentionally flipped, because
55 // in chunk node IDs the X,Y axes define horizontal plane,
56 // while in our 3D scene the X,Z axes define the horizontal plane
57 const float chXMin = dx ? xc : bbox.xMin;
58 const float chXMax = dx ? bbox.xMax : xc;
59 const float chZMin = dy ? zc : bbox.zMin;
60 const float chZMax = dy ? bbox.zMax : zc;
61 const float chYMin = bbox.yMin;
62 const float chYMax = bbox.yMax;
63 children << new QgsChunkNode( childId, QgsAABB( chXMin, chYMin, chZMin, chXMax, chYMax, chZMax ), childError, node );
64 }
65 return children;
66}
67
3
Definition: qgsaabb.h:34
float yMax
Definition: qgsaabb.h:85
float xMax
Definition: qgsaabb.h:84
float xCenter() const
Returns center in X axis.
Definition: qgsaabb.h:50
float xMin
Definition: qgsaabb.h:81
float zMax
Definition: qgsaabb.h:86
float yMin
Definition: qgsaabb.h:82
float zMin
Definition: qgsaabb.h:83
float zCenter() const
Returns center in Z axis.
Definition: qgsaabb.h:54