void QgsCameraController::onPositionChanged( Qt3DInput::QMouseEvent *mouse )
{
int dx = mouse->x() - mMousePos.x();
int dy = mouse->y() - mMousePos.y();
bool hasShift = ( mouse->modifiers() & Qt::ShiftModifier );
bool hasCtrl = ( mouse->modifiers() & Qt::ControlModifier );
bool hasLeftButton = ( mouse->buttons() & Qt::LeftButton );
bool hasMiddleButton = ( mouse->buttons() & Qt::MiddleButton );
bool hasRightButton = ( mouse->buttons() & Qt::RightButton );
if ( ( hasLeftButton && hasShift && !hasCtrl ) || ( hasMiddleButton && !hasShift && !hasCtrl ) )
{
// rotate/tilt using mouse (camera moves as it rotates around its view center)
float pitch = mCameraPose.pitchAngle();
float yaw = mCameraPose.headingAngle();
pitch += dy;
yaw -= dx / 2;
mCameraPose.setPitchAngle( pitch );
mCameraPose.setHeadingAngle( yaw );
updateCameraFromPose();
}
else if ( hasLeftButton && hasCtrl && !hasShift )
{
// rotate/tilt using mouse (camera stays at one position as it rotates)
float diffPitch = 0.2f * dy;
float diffYaw = 0.2f * -dx / 2;
rotateCamera( diffPitch, diffYaw );
updateCameraFromPose( true );
}
else if ( hasLeftButton && !hasShift && !hasCtrl )
{
// translation works as if one grabbed a point on the plane and dragged it
// i.e. find out x,z of the previous mouse point, find out x,z of the current mouse point
// and use the difference
float z = mLastPressedHeight;
QPointF p1 = screen_point_to_point_on_plane( QPointF( mMousePos.x(), mMousePos.y() ), mViewport, mCamera, z );
QPointF p2 = screen_point_to_point_on_plane( QPointF( mouse->x(), mouse->y() ), mViewport, mCamera, z );
QgsVector3D center = mCameraPose.centerPoint();
center.set( center.x() - ( p2.x() - p1.x() ), center.y(), center.z() - ( p2.y() - p1.y() ) );
mCameraPose.setCenterPoint( center );
updateCameraFromPose( true );
}
else if ( hasRightButton && !hasShift && !hasCtrl )
{
// zoom in/out
float dist = mCameraPose.distanceFromCenterPoint();
dist -= dist * dy * 0.01f;
mCameraPose.setDistanceFromCenterPoint( dist );
updateCameraFromPose();
}
mMousePos = QPoint( mouse->x(), mouse->y() );
}
QgsVector3D Qgs3DUtils::mapToWorldCoordinates( const QgsVector3D &mapCoords, const QgsVector3D &origin )
{
return QgsVector3D( mapCoords.x() - origin.x(),
mapCoords.z() - origin.z(),
-( mapCoords.y() - origin.y() ) );
}
void QgsCameraController::onKeyPressed( Qt3DInput::QKeyEvent *event )
{
bool hasShift = ( event->modifiers() & Qt::ShiftModifier );
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 )
{
float yaw = mCameraPose.headingAngle();
float dist = mCameraPose.distanceFromCenterPoint();
float x = tx * dist * 0.02f;
float y = -ty * dist * 0.02f;
// moving with keyboard - take into account yaw of camera
float t = sqrt( x * x + y * y );
float a = atan2( y, x ) - yaw * M_PI / 180;
float dx = cos( a ) * t;
float dy = sin( a ) * t;
QgsVector3D center = mCameraPose.centerPoint();
center.set( center.x() + dx, center.y(), center.z() + dy );
mCameraPose.setCenterPoint( center );
updateCameraFromPose( true );
}
else if ( hasShift && !hasCtrl )
{
// rotate/tilt using keyboard (camera moves as it rotates around its view center)
float pitch = mCameraPose.pitchAngle();
float yaw = mCameraPose.headingAngle();
pitch -= ty; // down key = moving camera toward terrain
yaw -= tx; // right key = moving camera clockwise
mCameraPose.setPitchAngle( pitch );
mCameraPose.setHeadingAngle( yaw );
updateCameraFromPose();
}
else if ( hasCtrl && !hasShift )
{
// rotate/tilt using keyboard (camera stays at one position as it rotates)
float diffPitch = ty; // down key = rotating camera down
float diffYaw = -tx; // right key = rotating camera to the right
rotateCamera( diffPitch, diffYaw );
updateCameraFromPose( true );
}
}
if ( tElev )
{
QgsVector3D center = mCameraPose.centerPoint();
center.set( center.x(), center.y() + tElev * 10, center.z() );
mCameraPose.setCenterPoint( center );
updateCameraFromPose( true );
}
}
QgsVector3D Qgs3DUtils::worldToMapCoordinates( const QgsVector3D &worldCoords, const QgsVector3D &origin )
{
return QgsVector3D( worldCoords.x() + origin.x(),
-worldCoords.z() + origin.y(),
worldCoords.y() + origin.z() );
}
