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qgscameracontroller.cpp
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/***************************************************************************
qgscameracontroller.cpp
--------------------------------------
Date : July 2017
Copyright : (C) 2017 by Martin Dobias
Email : wonder dot sk at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgscameracontroller.h"
#include "qgsvector3d.h"
#include "qgswindow3dengine.h"
#include "qgs3dmapscene.h"
#include "qgsterrainentity_p.h"
#include "qgis.h"
#include "qgs3dutils.h"
#include <QDomDocument>
#include <Qt3DRender/QCamera>
#include <Qt3DInput>
#include "qgslogger.h"
QgsCameraController::QgsCameraController( Qgs3DMapScene *scene )
: Qt3DCore::QEntity( scene )
, mScene( scene )
, mCamera( scene->engine()->camera() )
, mCameraBeforeRotation( new Qt3DRender::QCamera )
, mCameraBeforeDrag( new Qt3DRender::QCamera )
, mCameraBeforeZoom( new Qt3DRender::QCamera )
, mMouseHandler( new Qt3DInput::QMouseHandler )
, mKeyboardHandler( new Qt3DInput::QKeyboardHandler )
{
mMouseHandler->setSourceDevice( new Qt3DInput::QMouseDevice() );
connect( mMouseHandler, &Qt3DInput::QMouseHandler::positionChanged,
this, &QgsCameraController::onPositionChanged );
connect( mMouseHandler, &Qt3DInput::QMouseHandler::wheel,
this, &QgsCameraController::onWheel );
connect( mMouseHandler, &Qt3DInput::QMouseHandler::pressed,
this, &QgsCameraController::onMousePressed );
connect( mMouseHandler, &Qt3DInput::QMouseHandler::released,
this, &QgsCameraController::onMouseReleased );
addComponent( mMouseHandler );
mKeyboardHandler->setSourceDevice( new Qt3DInput::QKeyboardDevice() );
connect( mKeyboardHandler, &Qt3DInput::QKeyboardHandler::pressed,
this, &QgsCameraController::onKeyPressed );
connect( mKeyboardHandler, &Qt3DInput::QKeyboardHandler::released,
this, &QgsCameraController::onKeyReleased );
addComponent( mKeyboardHandler );
// Disable the handlers when the entity is disabled
connect( this, &Qt3DCore::QEntity::enabledChanged,
mMouseHandler, &Qt3DInput::QMouseHandler::setEnabled );
connect( this, &Qt3DCore::QEntity::enabledChanged,
mKeyboardHandler, &Qt3DInput::QKeyboardHandler::setEnabled );
mFpsNavTimer = new QTimer( this );
mFpsNavTimer->setInterval( 10 );
connect( mFpsNavTimer, &QTimer::timeout, this, &QgsCameraController::applyFlyModeKeyMovements );
mFpsNavTimer->start();
}
QgsCameraController::~QgsCameraController() = default;
QWindow *QgsCameraController::window() const
{
QgsWindow3DEngine *windowEngine = qobject_cast<QgsWindow3DEngine *>( mScene->engine() );
return windowEngine ? windowEngine->window() : nullptr;
}
void QgsCameraController::setCameraNavigationMode( Qgis::NavigationMode navigationMode )
{
if ( navigationMode == mCameraNavigationMode )
return;
mCameraNavigationMode = navigationMode;
mIgnoreNextMouseMove = true;
emit navigationModeChanged( mCameraNavigationMode );
}
void QgsCameraController::setCameraMovementSpeed( double movementSpeed )
{
if ( movementSpeed == mCameraMovementSpeed )
return;
mCameraMovementSpeed = movementSpeed;
emit cameraMovementSpeedChanged( mCameraMovementSpeed );
}
void QgsCameraController::setVerticalAxisInversion( Qgis::VerticalAxisInversion inversion )
{
mVerticalAxisInversion = inversion;
}
void QgsCameraController::rotateCamera( float diffPitch, float diffYaw )
{
const float pitch = mCameraPose.pitchAngle();
const float yaw = mCameraPose.headingAngle();
if ( pitch + diffPitch > 180 )
diffPitch = 180 - pitch; // prevent going over the head
if ( pitch + diffPitch < 0 )
diffPitch = 0 - pitch; // prevent going over the head
// Is it always going to be love/hate relationship with quaternions???
// This quaternion combines two rotations:
// - first it undoes the previously applied rotation so we have do not have any rotation compared to world coords
// - then it applies new rotation
// (We can't just apply our euler angles difference because the camera may be already rotated)
const QQuaternion q = QQuaternion::fromEulerAngles( pitch + diffPitch, yaw + diffYaw, 0 ) *
QQuaternion::fromEulerAngles( pitch, yaw, 0 ).conjugated();
// get camera's view vector, rotate it to get new view center
const QVector3D position = mCamera->position();
QVector3D viewCenter = mCamera->viewCenter();
const QVector3D viewVector = viewCenter - position;
const QVector3D cameraToCenter = q * viewVector;
viewCenter = position + cameraToCenter;
mCameraPose.setCenterPoint( viewCenter );
mCameraPose.setPitchAngle( pitch + diffPitch );
mCameraPose.setHeadingAngle( yaw + diffYaw );
updateCameraFromPose();
}
void QgsCameraController::frameTriggered( float dt )
{
Q_UNUSED( dt )
}
void QgsCameraController::resetView( float distance )
{
setViewFromTop( 0, 0, distance );
}
void QgsCameraController::setViewFromTop( float worldX, float worldY, float distance, float yaw )
{
QgsCameraPose camPose;
QgsTerrainEntity *terrain = mScene->terrainEntity();
if ( terrain )
camPose.setCenterPoint( QgsVector3D( worldX, terrain->terrainElevationOffset(), worldY ) );
else
camPose.setCenterPoint( QgsVector3D( worldX, 0.0f, worldY ) );
camPose.setDistanceFromCenterPoint( distance );
camPose.setHeadingAngle( yaw );
// a basic setup to make frustum depth range long enough that it does not cull everything
mCamera->setNearPlane( distance / 2 );
mCamera->setFarPlane( distance * 2 );
setCameraPose( camPose );
}
QgsVector3D QgsCameraController::lookingAtPoint() const
{
return mCameraPose.centerPoint();
}
void QgsCameraController::setLookingAtPoint( const QgsVector3D &point, float distance, float pitch, float yaw )
{
QgsCameraPose camPose;
camPose.setCenterPoint( point );
camPose.setDistanceFromCenterPoint( distance );
camPose.setPitchAngle( pitch );
camPose.setHeadingAngle( yaw );
setCameraPose( camPose );
}
void QgsCameraController::setCameraPose( const QgsCameraPose &camPose )
{
if ( camPose == mCameraPose )
return;
mCameraPose = camPose;
if ( mCamera )
mCameraPose.updateCamera( mCamera );
emit cameraChanged();
}
QDomElement QgsCameraController::writeXml( QDomDocument &doc ) const
{
QDomElement elemCamera = doc.createElement( QStringLiteral( "camera" ) );
elemCamera.setAttribute( QStringLiteral( "x" ), mCameraPose.centerPoint().x() );
elemCamera.setAttribute( QStringLiteral( "y" ), mCameraPose.centerPoint().z() );
elemCamera.setAttribute( QStringLiteral( "elev" ), mCameraPose.centerPoint().y() );
elemCamera.setAttribute( QStringLiteral( "dist" ), mCameraPose.distanceFromCenterPoint() );
elemCamera.setAttribute( QStringLiteral( "pitch" ), mCameraPose.pitchAngle() );
elemCamera.setAttribute( QStringLiteral( "yaw" ), mCameraPose.headingAngle() );
return elemCamera;
}
void QgsCameraController::readXml( const QDomElement &elem )
{
const float x = elem.attribute( QStringLiteral( "x" ) ).toFloat();
const float y = elem.attribute( QStringLiteral( "y" ) ).toFloat();
const float elev = elem.attribute( QStringLiteral( "elev" ) ).toFloat();
const float dist = elem.attribute( QStringLiteral( "dist" ) ).toFloat();
const float pitch = elem.attribute( QStringLiteral( "pitch" ) ).toFloat();
const float yaw = elem.attribute( QStringLiteral( "yaw" ) ).toFloat();
setLookingAtPoint( QgsVector3D( x, elev, y ), dist, pitch, yaw );
}
double QgsCameraController::sampleDepthBuffer( const QImage &buffer, int px, int py )
{
double depth = 1;
// Sample the neighbouring pixels for the closest point to the camera
for ( int x = px - 3; x <= px + 3; ++x )
{
for ( int y = py - 3; y <= py + 3; ++y )
{
if ( buffer.valid( x, y ) )
{
depth = std::min( depth, Qgs3DUtils::decodeDepth( buffer.pixel( x, y ) ) );
}
}
}
if ( depth < 1 )
return depth;
// Returns the average of depth values that are not 1 (void area)
depth = 0;
int samplesCount = 0;
for ( int x = 0; x < buffer.width(); ++x )
{
for ( int y = 0; y < buffer.height(); ++y )
{
double d = Qgs3DUtils::decodeDepth( buffer.pixel( x, y ) );
if ( d < 1 )
{
depth += d;
samplesCount += 1;
}
}
}
// if the whole buffer is white, a depth cannot be computed
if ( samplesCount == 0 )
depth = 1.0;
else
depth /= samplesCount;
return depth;
}
void QgsCameraController::updateCameraFromPose()
{
if ( mCamera )
mCameraPose.updateCamera( mCamera );
emit cameraChanged();
}
void QgsCameraController::moveCameraPositionBy( const QVector3D &posDiff )
{
mCameraPose.setCenterPoint( mCameraPose.centerPoint() + posDiff );
updateCameraFromPose();
}
void QgsCameraController::onPositionChanged( Qt3DInput::QMouseEvent *mouse )
{
switch ( mCameraNavigationMode )
{
case Qgis::NavigationMode::TerrainBased:
onPositionChangedTerrainNavigation( mouse );
break;
case Qgis::NavigationMode::Walk:
onPositionChangedFlyNavigation( mouse );
break;
}
}
bool QgsCameraController::screenPointToWorldPos( QPoint position, Qt3DRender::QCamera *cameraBefore, double &depth, QVector3D &worldPosition )
{
depth = sampleDepthBuffer( mDepthBufferImage, position.x(), position.y() );
if ( !std::isfinite( depth ) )
{
QgsDebugMsgLevel( QStringLiteral( "screenPointToWorldPos: depth is NaN or Inf. This should not happen." ), 2 );
return false;
}
else
{
worldPosition = Qgs3DUtils::screenPointToWorldPos( position, depth, mScene->engine()->size(), cameraBefore );
if ( !std::isfinite( worldPosition.x() ) || !std::isfinite( worldPosition.y() ) || !std::isfinite( worldPosition.z() ) )
{
QgsDebugMsgLevel( QStringLiteral( "screenPointToWorldPos: position is NaN or Inf. This should not happen." ), 2 );
return false;
}
else
{
return true;
}
}
}
void QgsCameraController::onPositionChangedTerrainNavigation( Qt3DInput::QMouseEvent *mouse )
{
if ( mIgnoreNextMouseMove )
{
mIgnoreNextMouseMove = false;
mMousePos = QPoint( mouse->x(), mouse->y() );
return;
}
const int dx = mouse->x() - mMousePos.x();
const int dy = mouse->y() - mMousePos.y();
const bool hasShift = ( mouse->modifiers() & Qt::ShiftModifier );
const bool hasCtrl = ( mouse->modifiers() & Qt::ControlModifier );
const bool hasLeftButton = ( mouse->buttons() & Qt::LeftButton );
const bool hasMiddleButton = ( mouse->buttons() & Qt::MiddleButton );
const bool hasRightButton = ( mouse->buttons() & Qt::RightButton );
if ( ( hasLeftButton && hasShift && !hasCtrl ) || ( hasMiddleButton && !hasShift && !hasCtrl ) )
{
// rotate/tilt using mouse (camera moves as it rotates around the clicked point)
double scale = std::max( mScene->engine()->size().width(), mScene->engine()->size().height() );
float pitchDiff = 180 * ( mouse->y() - mMiddleButtonClickPos.y() ) / scale;
float yawDiff = -180 * ( mouse->x() - mMiddleButtonClickPos.x() ) / scale;
if ( !mDepthBufferIsReady )
return;
if ( !mRotationCenterCalculated )
{
double depth;
QVector3D worldPosition;
if ( screenPointToWorldPos( mMiddleButtonClickPos, mCameraBeforeRotation.get(), depth, worldPosition ) )
{
mRotationCenter = worldPosition;
mRotationDistanceFromCenter = ( mRotationCenter - mCameraBeforeRotation->position() ).length();
emit cameraRotationCenterChanged( mRotationCenter );
mRotationCenterCalculated = true;
}
}
// First transformation : Shift camera position and view center and rotate the camera
{
QVector3D shiftVector = mRotationCenter - mCamera->viewCenter();
QVector3D newViewCenterWorld = camera()->viewCenter() + shiftVector;
QVector3D newCameraPosition = camera()->position() + shiftVector;
mCameraPose.setDistanceFromCenterPoint( ( newViewCenterWorld - newCameraPosition ).length() );
mCameraPose.setCenterPoint( newViewCenterWorld );
mCameraPose.setPitchAngle( mRotationPitch + pitchDiff );
mCameraPose.setHeadingAngle( mRotationYaw + yawDiff );
updateCameraFromPose();
}
// Second transformation : Shift camera position back
{
QgsRay3D ray = Qgs3DUtils::rayFromScreenPoint( QPoint( mMiddleButtonClickPos.x(), mMiddleButtonClickPos.y() ), mScene->engine()->size(), mCamera );
QVector3D clickedPositionWorld = ray.origin() + mRotationDistanceFromCenter * ray.direction();
QVector3D shiftVector = clickedPositionWorld - mCamera->viewCenter();
QVector3D newViewCenterWorld = camera()->viewCenter() - shiftVector;
QVector3D newCameraPosition = camera()->position() - shiftVector;
mCameraPose.setDistanceFromCenterPoint( ( newViewCenterWorld - newCameraPosition ).length() );
mCameraPose.setCenterPoint( newViewCenterWorld );
updateCameraFromPose();
}
}
else if ( hasLeftButton && hasCtrl && !hasShift )
{
// rotate/tilt using mouse (camera stays at one position as it rotates)
const float diffPitch = 0.2f * dy;
const float diffYaw = - 0.2f * dx;
rotateCamera( diffPitch, diffYaw );
}
else if ( hasLeftButton && !hasShift && !hasCtrl )
{
// translation works as if one grabbed a point on the 3D viewer and dragged it
if ( !mDepthBufferIsReady )
return;
if ( !mDragPointCalculated )
{
double depth;
QVector3D worldPosition;
if ( screenPointToWorldPos( mDragButtonClickPos, mCameraBeforeDrag.get(), depth, worldPosition ) )
{
mDragDepth = depth;
mDragPoint = worldPosition;
mDragPointCalculated = true;
}
}
QVector3D cameraBeforeDragPos = mCameraBeforeDrag->position();
QVector3D moveToPosition = Qgs3DUtils::screenPointToWorldPos( mMousePos, mDragDepth, mScene->engine()->size(), mCameraBeforeDrag.get() );
QVector3D cameraBeforeToMoveToPos = ( moveToPosition - mCameraBeforeDrag->position() ).normalized();
QVector3D cameraBeforeToDragPointPos = ( mDragPoint - mCameraBeforeDrag->position() ).normalized();
// Make sure the rays are not horizontal (add small y shift if it is)
if ( cameraBeforeToMoveToPos.y() == 0 )
{
cameraBeforeToMoveToPos.setY( 0.01 );
cameraBeforeToMoveToPos = cameraBeforeToMoveToPos.normalized();
}
if ( cameraBeforeToDragPointPos.y() == 0 )
{
cameraBeforeToDragPointPos.setY( 0.01 );
cameraBeforeToDragPointPos = cameraBeforeToDragPointPos.normalized();
}
double d1 = ( mDragPoint.y() - cameraBeforeDragPos.y() ) / cameraBeforeToMoveToPos.y();
double d2 = ( mDragPoint.y() - cameraBeforeDragPos.y() ) / cameraBeforeToDragPointPos.y();
QVector3D from = cameraBeforeDragPos + d1 * cameraBeforeToMoveToPos;
QVector3D to = cameraBeforeDragPos + d2 * cameraBeforeToDragPointPos;
QVector3D shiftVector = to - from;
mCameraPose.setCenterPoint( mCameraBeforeDrag->viewCenter() + shiftVector );
updateCameraFromPose();
}
else if ( hasLeftButton && hasShift && hasCtrl )
{
// change the camera elevation, similar to pageUp/pageDown
QgsVector3D center = mCameraPose.centerPoint();
double tElev = mMousePos.y() - mouse->y();
center.set( center.x(), center.y() + tElev * 0.5, center.z() );
mCameraPose.setCenterPoint( center );
updateCameraFromPose();
}
else if ( hasRightButton && !hasShift && !hasCtrl )
{
if ( !mDepthBufferIsReady )
return;
if ( !mDragPointCalculated )
{
double depth;
QVector3D worldPosition;
if ( screenPointToWorldPos( mDragButtonClickPos, mCameraBeforeDrag.get(), depth, worldPosition ) )
{
mDragPoint = worldPosition;
mDragPointCalculated = true;
}
}
float dist = ( mCameraBeforeDrag->position() - mDragPoint ).length();
int yOffset = 0;
int screenHeight = mScene->engine()->size().height();
QWindow *win = window();
if ( win )
{
yOffset = win->mapToGlobal( QPoint( 0, 0 ) ).y();
screenHeight = win->screen()->size().height();
}
// Applies smoothing
if ( mMousePos.y() > mDragButtonClickPos.y() ) // zoom in
{
double f = ( double )( mMousePos.y() - mDragButtonClickPos.y() ) / ( double )( screenHeight - mDragButtonClickPos.y() - yOffset );
f = std::max( 0.0, std::min( 1.0, f ) );
f = 1 - ( std::expm1( -2 * f ) ) / ( std::expm1( -2 ) );
dist = dist * f;
}
else // zoom out
{
double f = 1 - ( double )( mMousePos.y() + yOffset ) / ( double )( mDragButtonClickPos.y() + yOffset );
f = std::max( 0.0, std::min( 1.0, f ) );
f = ( std::expm1( 2 * f ) ) / ( std::expm1( 2 ) );
dist = dist + 2 * dist * f;
}
// First transformation : Shift camera position and view center and rotate the camera
{
QVector3D shiftVector = mDragPoint - mCamera->viewCenter();
QVector3D newViewCenterWorld = camera()->viewCenter() + shiftVector;
mCameraPose.setDistanceFromCenterPoint( dist );
mCameraPose.setCenterPoint( newViewCenterWorld );
updateCameraFromPose();
}
// Second transformation : Shift camera position back
{
QgsRay3D ray = Qgs3DUtils::rayFromScreenPoint( QPoint( mDragButtonClickPos.x(), mDragButtonClickPos.y() ), mScene->engine()->size(), mCamera );
QVector3D clickedPositionWorld = ray.origin() + dist * ray.direction();
QVector3D shiftVector = clickedPositionWorld - mCamera->viewCenter();
QVector3D newViewCenterWorld = camera()->viewCenter() - shiftVector;
QVector3D newCameraPosition = camera()->position() - shiftVector;
mCameraPose.setDistanceFromCenterPoint( ( newViewCenterWorld - newCameraPosition ).length() );
mCameraPose.setCenterPoint( newViewCenterWorld );
updateCameraFromPose();
}
}
mMousePos = QPoint( mouse->x(), mouse->y() );
}
void QgsCameraController::zoom( float factor )
{
// zoom in/out
float dist = mCameraPose.distanceFromCenterPoint();
dist -= dist * factor * 0.01f;
mCameraPose.setDistanceFromCenterPoint( dist );
updateCameraFromPose();
}
void QgsCameraController::handleTerrainNavigationWheelZoom()
{
if ( !mDepthBufferIsReady )
return;
if ( !mZoomPointCalculated )
{
double depth;
QVector3D worldPosition;
if ( screenPointToWorldPos( mMousePos, mCameraBeforeZoom.get(), depth, worldPosition ) )
{
mZoomPoint = worldPosition;
mZoomPointCalculated = true;
}
}
float f = mCumulatedWheelY / ( 120.0 * 24.0 );
double dist = ( mZoomPoint - mCameraBeforeZoom->position() ).length();
dist -= dist * f;
// First transformation : Shift camera position and view center and rotate the camera
{
QVector3D shiftVector = mZoomPoint - mCamera->viewCenter();
QVector3D newViewCenterWorld = camera()->viewCenter() + shiftVector;
mCameraPose.setDistanceFromCenterPoint( dist );
mCameraPose.setCenterPoint( newViewCenterWorld );
updateCameraFromPose();
}
// Second transformation : Shift camera position back
{
QgsRay3D ray = Qgs3DUtils::rayFromScreenPoint( QPoint( mMousePos.x(), mMousePos.y() ), mScene->engine()->size(), mCamera );
QVector3D clickedPositionWorld = ray.origin() + dist * ray.direction();
QVector3D shiftVector = clickedPositionWorld - mCamera->viewCenter();
QVector3D newViewCenterWorld = camera()->viewCenter() - shiftVector;
QVector3D newCameraPosition = camera()->position() - shiftVector;
mCameraPose.setDistanceFromCenterPoint( ( newViewCenterWorld - newCameraPosition ).length() );
mCameraPose.setCenterPoint( newViewCenterWorld );
updateCameraFromPose();
}
mIsInZoomInState = false;
mCumulatedWheelY = 0;
}
void QgsCameraController::onWheel( Qt3DInput::QWheelEvent *wheel )
{
switch ( mCameraNavigationMode )
{
case Qgis::NavigationMode::Walk:
{
const float scaling = ( ( wheel->modifiers() & Qt::ControlModifier ) != 0 ? 0.1f : 1.0f ) / 1000.f;
setCameraMovementSpeed( mCameraMovementSpeed + mCameraMovementSpeed * scaling * wheel->angleDelta().y() );
break;
}
case Qgis::NavigationMode::TerrainBased:
{
const float scaling = ( ( wheel->modifiers() & Qt::ControlModifier ) != 0 ? 0.5f : 5.f );
// Apparently angleDelta needs to be accumulated
// see: https://doc.qt.io/qt-5/qwheelevent.html#angleDelta
mCumulatedWheelY += scaling * wheel->angleDelta().y();
if ( !mIsInZoomInState )
{
mCameraPose.updateCamera( mCameraBeforeZoom.get() );
mCameraBeforeZoom->setProjectionMatrix( mCamera->projectionMatrix() );
mCameraBeforeZoom->setNearPlane( mCamera->nearPlane() );
mCameraBeforeZoom->setFarPlane( mCamera->farPlane() );
mCameraBeforeZoom->setAspectRatio( mCamera->aspectRatio() );
mCameraBeforeZoom->setFieldOfView( mCamera->fieldOfView() );
mZoomPointCalculated = false;
mIsInZoomInState = true;
mDepthBufferIsReady = false;
emit requestDepthBufferCapture();
}
else
handleTerrainNavigationWheelZoom();
break;
}
}
}
void QgsCameraController::onMousePressed( Qt3DInput::QMouseEvent *mouse )
{
mKeyboardHandler->setFocus( true );
if ( mouse->button() == Qt3DInput::QMouseEvent::LeftButton || mouse->button() == Qt3DInput::QMouseEvent::RightButton )
{
mMousePos = QPoint( mouse->x(), mouse->y() );
mDragButtonClickPos = QPoint( mouse->x(), mouse->y() );
mPressedButton = mouse->button();
mMousePressed = true;
if ( mCaptureFpsMouseMovements )
mIgnoreNextMouseMove = true;
mCameraPose.updateCamera( mCameraBeforeDrag.get() );
mCameraBeforeDrag->setProjectionMatrix( mCamera->projectionMatrix() );
mCameraBeforeDrag->setNearPlane( mCamera->nearPlane() );
mCameraBeforeDrag->setFarPlane( mCamera->farPlane() );
mCameraBeforeDrag->setAspectRatio( mCamera->aspectRatio() );
mCameraBeforeDrag->setFieldOfView( mCamera->fieldOfView() );
mDepthBufferIsReady = false;
mDragPointCalculated = false;
emit requestDepthBufferCapture();
}
if ( mouse->button() == Qt3DInput::QMouseEvent::MiddleButton || ( ( mouse->modifiers() & Qt::ShiftModifier ) != 0 && mouse->button() == Qt3DInput::QMouseEvent::LeftButton ) )
{
mMousePos = QPoint( mouse->x(), mouse->y() );
mMiddleButtonClickPos = QPoint( mouse->x(), mouse->y() );
mPressedButton = mouse->button();
mMousePressed = true;
if ( mCaptureFpsMouseMovements )
mIgnoreNextMouseMove = true;
mDepthBufferIsReady = false;
mRotationCenterCalculated = false;
mRotationPitch = mCameraPose.pitchAngle();
mRotationYaw = mCameraPose.headingAngle();
mCameraPose.updateCamera( mCameraBeforeRotation.get() );
mCameraBeforeRotation->setProjectionMatrix( mCamera->projectionMatrix() );
mCameraBeforeRotation->setNearPlane( mCamera->nearPlane() );
mCameraBeforeRotation->setFarPlane( mCamera->farPlane() );
mCameraBeforeRotation->setAspectRatio( mCamera->aspectRatio() );
mCameraBeforeRotation->setFieldOfView( mCamera->fieldOfView() );
emit requestDepthBufferCapture();
}
}
void QgsCameraController::onMouseReleased( Qt3DInput::QMouseEvent *mouse )
{
Q_UNUSED( mouse )
mPressedButton = Qt3DInput::QMouseEvent::NoButton;
mMousePressed = false;
mDragPointCalculated = false;
mRotationCenterCalculated = false;
}
void QgsCameraController::onKeyPressed( Qt3DInput::QKeyEvent *event )
{
if ( event->modifiers() & Qt::ControlModifier && event->key() == Qt::Key_QuoteLeft )
{
// switch navigation mode
switch ( mCameraNavigationMode )
{
case Qgis::NavigationMode::Walk:
setCameraNavigationMode( Qgis::NavigationMode::TerrainBased );
break;
case Qgis::NavigationMode::TerrainBased:
setCameraNavigationMode( Qgis::NavigationMode::Walk );
break;
}
return;
}
switch ( mCameraNavigationMode )
{
case Qgis::NavigationMode::Walk:
{
onKeyPressedFlyNavigation( event );
break;
}
case Qgis::NavigationMode::TerrainBased:
{
onKeyPressedTerrainNavigation( event );
break;
}
}
}
void QgsCameraController::onKeyPressedTerrainNavigation( Qt3DInput::QKeyEvent *event )
{
const bool hasShift = ( event->modifiers() & Qt::ShiftModifier );
const bool hasCtrl = ( event->modifiers() & Qt::ControlModifier );
int tx = 0, ty = 0, tElev = 0;
switch ( event->key() )
{
case Qt::Key_Left:
tx -= 1;
break;
case Qt::Key_Right:
tx += 1;
break;
case Qt::Key_Up:
ty += 1;
break;
case Qt::Key_Down:
ty -= 1;
break;
case Qt::Key_PageDown:
tElev -= 1;
break;
case Qt::Key_PageUp:
tElev += 1;
break;
}
if ( tx || ty )
{
if ( !hasShift && !hasCtrl )
{
moveView( tx, ty );
}
else if ( hasShift && !hasCtrl )
{
// rotate/tilt using keyboard (camera moves as it rotates around its view center)
tiltUpAroundViewCenter( ty );
rotateAroundViewCenter( tx );
}
else if ( hasCtrl && !hasShift )
{
// rotate/tilt using keyboard (camera stays at one position as it rotates)
const float diffPitch = ty; // down key = rotating camera down
const float diffYaw = -tx; // right key = rotating camera to the right
rotateCamera( diffPitch, diffYaw );
}
}
if ( tElev )
{
QgsVector3D center = mCameraPose.centerPoint();
center.set( center.x(), center.y() + tElev * 10, center.z() );
mCameraPose.setCenterPoint( center );
updateCameraFromPose();
}
}
void QgsCameraController::onKeyPressedFlyNavigation( Qt3DInput::QKeyEvent *event )
{
switch ( event->key() )
{
case Qt::Key_QuoteLeft:
{
// toggle mouse lock mode
mCaptureFpsMouseMovements = !mCaptureFpsMouseMovements;
mIgnoreNextMouseMove = true;
if ( mCaptureFpsMouseMovements )
{
qApp->setOverrideCursor( QCursor( Qt::BlankCursor ) );
}
else
{
qApp->restoreOverrideCursor();
}
return;
}
case Qt::Key_Escape:
{
// always exit mouse lock mode
if ( mCaptureFpsMouseMovements )
{
mCaptureFpsMouseMovements = false;
mIgnoreNextMouseMove = true;
qApp->restoreOverrideCursor();
return;
}
break;
}
default:
break;
}
if ( event->isAutoRepeat() )
return;
mDepressedKeys.insert( event->key() );
}
void QgsCameraController::walkView( double tx, double ty, double tz )
{
const QVector3D cameraUp = mCamera->upVector().normalized();
const QVector3D cameraFront = ( QVector3D( mCameraPose.centerPoint().x(), mCameraPose.centerPoint().y(), mCameraPose.centerPoint().z() ) - mCamera->position() ).normalized();
const QVector3D cameraLeft = QVector3D::crossProduct( cameraUp, cameraFront );
QVector3D cameraPosDiff( 0.0f, 0.0f, 0.0f );
if ( tx != 0.0 )
{
cameraPosDiff += tx * cameraFront;
}
if ( ty != 0.0 )
{
cameraPosDiff += ty * cameraLeft;
}
if ( tz != 0.0 )
{
cameraPosDiff += tz * QVector3D( 0.0f, 1.0f, 0.0f );
}
moveCameraPositionBy( cameraPosDiff );
}
void QgsCameraController::applyFlyModeKeyMovements()
{
// shift = "run", ctrl = "slow walk"
const bool shiftPressed = mDepressedKeys.contains( Qt::Key_Shift );
const bool ctrlPressed = mDepressedKeys.contains( Qt::Key_Control );
const double movementSpeed = mCameraMovementSpeed * ( shiftPressed ? 2 : 1 ) * ( ctrlPressed ? 0.1 : 1 );
bool changed = false;
double x = 0.0;
double y = 0.0;
double z = 0.0;
if ( mDepressedKeys.contains( Qt::Key_Left ) || mDepressedKeys.contains( Qt::Key_A ) )
{
changed = true;
y += movementSpeed;
}
if ( mDepressedKeys.contains( Qt::Key_Right ) || mDepressedKeys.contains( Qt::Key_D ) )
{
changed = true;
y -= movementSpeed;
}
if ( mDepressedKeys.contains( Qt::Key_Up ) || mDepressedKeys.contains( Qt::Key_W ) )
{
changed = true;
x += movementSpeed;
}
if ( mDepressedKeys.contains( Qt::Key_Down ) || mDepressedKeys.contains( Qt::Key_S ) )
{
changed = true;
x -= movementSpeed;
}
// note -- vertical axis movements are slower by default then horizontal ones, as GIS projects
// tend to have much more limited elevation range vs ground range
static constexpr double ELEVATION_MOVEMENT_SCALE = 0.5;
if ( mDepressedKeys.contains( Qt::Key_PageUp ) || mDepressedKeys.contains( Qt::Key_E ) )
{
changed = true;
z += ELEVATION_MOVEMENT_SCALE * movementSpeed;
}
if ( mDepressedKeys.contains( Qt::Key_PageDown ) || mDepressedKeys.contains( Qt::Key_Q ) )
{
changed = true;
z -= ELEVATION_MOVEMENT_SCALE * movementSpeed;
}
if ( changed )
walkView( x, y, z );
}
void QgsCameraController::onPositionChangedFlyNavigation( Qt3DInput::QMouseEvent *mouse )
{
const bool hasMiddleButton = ( mouse->buttons() & Qt::MiddleButton );
const bool hasRightButton = ( mouse->buttons() & Qt::RightButton );
const double dx = mCaptureFpsMouseMovements ? QCursor::pos().x() - mMousePos.x() : mouse->x() - mMousePos.x();
const double dy = mCaptureFpsMouseMovements ? QCursor::pos().y() - mMousePos.y() : mouse->y() - mMousePos.y();
mMousePos = mCaptureFpsMouseMovements ? QCursor::pos() : QPoint( mouse->x(), mouse->y() );
if ( mIgnoreNextMouseMove )
{
mIgnoreNextMouseMove = false;
return;
}
if ( hasMiddleButton )
{
// middle button drag = pan camera in place (strafe)
const QVector3D cameraUp = mCamera->upVector().normalized();
const QVector3D cameraFront = ( QVector3D( mCameraPose.centerPoint().x(), mCameraPose.centerPoint().y(), mCameraPose.centerPoint().z() ) - mCamera->position() ).normalized();
const QVector3D cameraLeft = QVector3D::crossProduct( cameraUp, cameraFront );
const QVector3D cameraPosDiff = -dx * cameraLeft - dy * cameraUp;
moveCameraPositionBy( mCameraMovementSpeed * cameraPosDiff / 10.0 );
}
else if ( hasRightButton )
{
// right button drag = camera dolly
const QVector3D cameraFront = ( QVector3D( mCameraPose.centerPoint().x(), mCameraPose.centerPoint().y(), mCameraPose.centerPoint().z() ) - mCamera->position() ).normalized();
const QVector3D cameraPosDiff = dy * cameraFront;
moveCameraPositionBy( mCameraMovementSpeed * cameraPosDiff / 5.0 );
}
else
{
if ( mCaptureFpsMouseMovements )
{
float diffPitch = -0.2f * dy;
switch ( mVerticalAxisInversion )
{
case Qgis::VerticalAxisInversion::Always:
diffPitch *= -1;
break;
case Qgis::VerticalAxisInversion::WhenDragging:
case Qgis::VerticalAxisInversion::Never:
break;
}
const float diffYaw = - 0.2f * dx;
rotateCamera( diffPitch, diffYaw );
}
else if ( mouse->buttons() & Qt::LeftButton )
{
float diffPitch = -0.2f * dy;
switch ( mVerticalAxisInversion )
{
case Qgis::VerticalAxisInversion::Always:
case Qgis::VerticalAxisInversion::WhenDragging:
diffPitch *= -1;
break;
case Qgis::VerticalAxisInversion::Never:
break;
}
const float diffYaw = - 0.2f * dx;
rotateCamera( diffPitch, diffYaw );
}
}
if ( mCaptureFpsMouseMovements )
{
mIgnoreNextMouseMove = true;
// reset cursor back to center of map widget
emit setCursorPosition( QPoint( mScene->engine()->size().width() / 2, mScene->engine()->size().height() / 2 ) );
}
}
void QgsCameraController::onKeyReleased( Qt3DInput::QKeyEvent *event )
{
if ( event->isAutoRepeat() )
return;
mDepressedKeys.remove( event->key() );
}
void QgsCameraController::tiltUpAroundViewCenter( float deltaPitch )
{
// Tilt up the view by deltaPitch around the view center (camera moves)
float pitch = mCameraPose.pitchAngle();
pitch -= deltaPitch; // down key = moving camera toward terrain
mCameraPose.setPitchAngle( pitch );
updateCameraFromPose();
}
void QgsCameraController::rotateAroundViewCenter( float deltaYaw )
{
// Rotate clockwise the view by deltaYaw around the view center (camera moves)
float yaw = mCameraPose.headingAngle();
yaw -= deltaYaw; // right key = moving camera clockwise
mCameraPose.setHeadingAngle( yaw );
updateCameraFromPose();
}