QGIS API Documentation 3.27.0-Master (1c05421486)
qgscamerapose.cpp
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1/***************************************************************************
2 qgscamerapose.cpp
3 --------------------------------------
4 Date : July 2018
5 Copyright : (C) 2018 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 "qgscamerapose.h"
17
18#include <Qt3DRender/QCamera>
19
20#include <QDomDocument>
21
22QDomElement QgsCameraPose::writeXml( QDomDocument &doc ) const
23{
24 QDomElement elemCamera = doc.createElement( QStringLiteral( "camera-pose" ) );
25 elemCamera.setAttribute( QStringLiteral( "x" ), mCenterPoint.x() );
26 elemCamera.setAttribute( QStringLiteral( "y" ), mCenterPoint.y() );
27 elemCamera.setAttribute( QStringLiteral( "z" ), mCenterPoint.z() );
28 elemCamera.setAttribute( QStringLiteral( "dist" ), mDistanceFromCenterPoint );
29 elemCamera.setAttribute( QStringLiteral( "pitch" ), mPitchAngle );
30 elemCamera.setAttribute( QStringLiteral( "heading" ), mHeadingAngle );
31 return elemCamera;
32}
33
34void QgsCameraPose::readXml( const QDomElement &elem )
35{
36 const double x = elem.attribute( QStringLiteral( "x" ) ).toDouble();
37 const double y = elem.attribute( QStringLiteral( "y" ) ).toDouble();
38 const double z = elem.attribute( QStringLiteral( "z" ) ).toDouble();
39 mCenterPoint = QgsVector3D( x, y, z );
40
41 mDistanceFromCenterPoint = elem.attribute( QStringLiteral( "dist" ) ).toFloat();
42 mPitchAngle = elem.attribute( QStringLiteral( "pitch" ) ).toFloat();
43 mHeadingAngle = elem.attribute( QStringLiteral( "heading" ) ).toFloat();
44}
45
47{
48 // something went horribly wrong. Prevent further errors
49 if ( std::isnan( point.x() ) || std::isnan( point.y() ) || std::isnan( point.z() ) )
50 qWarning() << "Not updating camera position: it cannot be NaN!";
51 else
52 mCenterPoint = point;
53}
54
56{
57 mDistanceFromCenterPoint = std::max( distance, 10.0f );
58}
59
61{
62 // prevent going over the head
63 // prevent bug in QgsCameraPose::updateCamera when updating camera rotation.
64 // With a mPitchAngle < 0.2 or > 179.8, QQuaternion::fromEulerAngles( mPitchAngle, mHeadingAngle, 0 )
65 // will return bad rotation angle.
66 // See https://bugreports.qt.io/browse/QTBUG-72103
67 mPitchAngle = std::clamp( pitch, 0.2f, 179.8f );
68}
69
70void QgsCameraPose::updateCamera( Qt3DRender::QCamera *camera )
71{
72 // basic scene setup:
73 // - x grows to the right
74 // - z grows to the bottom
75 // - y grows towards camera
76 // so a point on the plane (x',y') is transformed to (x,-z) in our 3D world
77 camera->setUpVector( QVector3D( 0, 0, -1 ) );
78 camera->setPosition( QVector3D( mCenterPoint.x(), mDistanceFromCenterPoint + mCenterPoint.y(), mCenterPoint.z() ) );
79 camera->setViewCenter( QVector3D( mCenterPoint.x(), mCenterPoint.y(), mCenterPoint.z() ) );
80 camera->rotateAboutViewCenter( QQuaternion::fromEulerAngles( mPitchAngle, mHeadingAngle, 0 ) );
81}
void setPitchAngle(float pitch)
Sets pitch angle in degrees.
QDomElement writeXml(QDomDocument &doc) const
Writes configuration to a new DOM element and returns it.
void setCenterPoint(const QgsVector3D &point)
Sets center point (towards which point the camera is looking)
void readXml(const QDomElement &elem)
Reads configuration from a DOM element previously written using writeXml()
void setDistanceFromCenterPoint(float distance)
Sets distance of the camera from the center point.
void updateCamera(Qt3DRender::QCamera *camera)
Update Qt3D camera view matrix based on the pose.
double y() const
Returns Y coordinate.
Definition: qgsvector3d.h:51
double z() const
Returns Z coordinate.
Definition: qgsvector3d.h:53
double x() const
Returns X coordinate.
Definition: qgsvector3d.h:49