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Svg files does not appear on the screen



  • When i run my code, my svg's does not appear on the screen. What can be the reason?
    There is no error code, i debug it but i cannot find any error also

    #ifndef QFI_ADI_CPP
    #define QFI_ADI_CPP
    #endif
    #ifdef WIN32
    #   include <float.h>
    #endif
    #include <math.h>
    #include "qfi_ADI.h"
    
    qfi_ADI::qfi_ADI(QWidget *parent):
        QGraphicsView(parent),
        m_scene ( nullptr ),
    
        m_itemBack ( nullptr ),
        m_itemFace ( nullptr ),
        m_itemRing ( nullptr ),
        m_itemCase ( nullptr ),
    
        m_roll  ( 0.0f ),
        m_pitch ( 0.0f ),
    
        m_faceDeltaX_new ( 0.0f ),
        m_faceDeltaX_old ( 0.0f ),
        m_faceDeltaY_new ( 0.0f ),
        m_faceDeltaY_old ( 0.0f ),
    
        m_scaleX ( 1.0f ),
        m_scaleY ( 1.0f ),
    
        m_originalHeight ( 240 ),
        m_originalWidth  ( 240 ),
    
        m_originalPixPerDeg ( 1.7f ),
    
        m_originalAdiCtr ( 120.0f, 120.0f ),
    
        m_backZ ( -30 ),
        m_faceZ ( -20 ),
        m_ringZ ( -10 ),
        m_caseZ (  10 )
    {
        reset();
        m_scene = new QGraphicsScene( this );
        setScene( m_scene );
    
        m_scene->clear();
    
        init();
    }
    
    qfi_ADI::~qfi_ADI()
    {
        if ( m_scene != nullptr )
        {
            m_scene->clear();
            delete m_scene;
            m_scene = nullptr;
        }
    
        reset();
    }
    
    ////////////////////////////////////////////////////////////////////////////////
    
    void qfi_ADI::reinit()
    {
        if ( m_scene )
        {
            m_scene->clear();
    
            init();
        }
    }
    
    ////////////////////////////////////////////////////////////////////////////////
    
    void qfi_ADI::update()
    {
        updateView();
    
        m_faceDeltaX_old  = m_faceDeltaX_new;
        m_faceDeltaY_old  = m_faceDeltaY_new;
    }
    
    ////////////////////////////////////////////////////////////////////////////////
    
    void qfi_ADI::setRoll( float roll )
    {
        m_roll = roll;
    
        if ( m_roll < -180.0f ) m_roll = -180.0f;
        if ( m_roll >  180.0f ) m_roll =  180.0f;
    }
    
    ////////////////////////////////////////////////////////////////////////////////
    
    void qfi_ADI::setPitch( float pitch )
    {
        m_pitch = pitch;
    
        if ( m_pitch < -25.0f ) m_pitch = -25.0f;
        if ( m_pitch >  25.0f ) m_pitch =  25.0f;
    }
    
    ////////////////////////////////////////////////////////////////////////////////
    
    void qfi_ADI::resizeEvent( QResizeEvent *event )
    {
        ////////////////////////////////////
        QGraphicsView::resizeEvent( event );
        ////////////////////////////////////
    
        reinit();
    }
    
    ////////////////////////////////////////////////////////////////////////////////
    
    void qfi_ADI::init()
    {
        m_scaleX = (float)width()  / (float)m_originalWidth;
        m_scaleY = (float)height() / (float)m_originalHeight;
    
        reset();
    
        m_itemBack = new QGraphicsSvgItem( ":/qfi/images/adi_back.svg");
        m_itemBack->setCacheMode( QGraphicsItem::NoCache );
        m_itemBack->setZValue( m_backZ );
        m_itemBack->setTransform( QTransform::fromScale( m_scaleX, m_scaleY ), true );
        m_itemBack->setTransformOriginPoint( m_originalAdiCtr );
        m_scene->addItem( m_itemBack );
    
        m_itemFace = new QGraphicsSvgItem( ":/qfi/images/adi_face.svg");
        m_itemFace->setCacheMode( QGraphicsItem::NoCache );
        m_itemFace->setZValue( m_faceZ );
        m_itemFace->setTransform( QTransform::fromScale( m_scaleX, m_scaleY ), true );
        m_itemFace->setTransformOriginPoint( m_originalAdiCtr );
        m_scene->addItem( m_itemFace );
    
        m_itemRing = new QGraphicsSvgItem( ":/qfi/images/adi_ring.svg");
        m_itemRing->setCacheMode( QGraphicsItem::NoCache );
        m_itemRing->setZValue( m_ringZ );
        m_itemRing->setTransform( QTransform::fromScale( m_scaleX, m_scaleY ), true );
        m_itemRing->setTransformOriginPoint( m_originalAdiCtr );
        m_scene->addItem( m_itemRing );
    
        m_itemCase = new QGraphicsSvgItem( ":/qfi/images/adi_case.svg");
        m_itemCase->setCacheMode( QGraphicsItem::NoCache );
        m_itemCase->setZValue( m_caseZ );
        m_itemCase->setTransform( QTransform::fromScale( m_scaleX, m_scaleY ), true );
        m_scene->addItem( m_itemCase );
    
        centerOn( width() / 2.0f, height() / 2.0f );
    
        updateView();
    }
    
    
    
    void qfi_ADI::reset()
    {
        m_itemBack = nullptr;
        m_itemFace = nullptr;
        m_itemRing = nullptr;
        m_itemCase = nullptr;
    
        m_roll  = 0.0f;
        m_pitch = 0.0f;
    
        m_faceDeltaX_new = 0.0f;
        m_faceDeltaX_old = 0.0f;
        m_faceDeltaY_new = 0.0f;
        m_faceDeltaY_old = 0.0f;
    }
    
    ////////////////////////////////////////////////////////////////////////////////
    
    void qfi_ADI::updateView()
    {
        m_scaleX = (float)width()  / (float)m_originalWidth;
        m_scaleY = (float)height() / (float)m_originalHeight;
    
        m_itemBack->setRotation( - m_roll );
        m_itemFace->setRotation( - m_roll );
        m_itemRing->setRotation( - m_roll );
    
        float roll_rad = M_PI * m_roll / 180.0;
    
        float delta  = m_originalPixPerDeg * m_pitch;
    
        m_faceDeltaX_new = m_scaleX * delta * sin( roll_rad );
        m_faceDeltaY_new = m_scaleY * delta * cos( roll_rad );
    
        m_itemFace->moveBy( m_faceDeltaX_new - m_faceDeltaX_old, m_faceDeltaY_new - m_faceDeltaY_old );
    
        m_scene->update();
    }
    

  • Moderators

    @suslucoder
    taken from the documentation:

    Qt supports the static features of SVG 1.2 Tiny. ECMA scripts and DOM manipulation are currently not supported.
    

    https://doc.qt.io/qt-5/svgrendering.html

    does your SVG file comply ?



  • @J-Hilk

    does your SVG file comply ?

    Yes, they are


  • Moderators

    @suslucoder said in Svg files does not appear on the screen:

    There is no error code, i debug it but i cannot find any error also

    Please simplify your code. Just write a small program that displays 1 PNG image and does nothing else.

    When that works, replace the PNG image with an SVG image.


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