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POLoading files into drawBackground(QPainter *painter, const QRectF &)
 

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  1. POLoading files into drawBackground(QPainter *painter, const QRectF &)
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    <p>currently i am trying to laod *.obj-files into my programm. My code is based on this example:</p> <p><a href="http://qt.gitorious.org/qt-labs/modelviewer" rel="nofollow">Accelerate your widgets with OpenGL(changed link)</a></p> <p>The only differeence in my code, is that i have a glwidget-class, in which all the drawing is defined. In the class OpenGLScene only my Gui is defined. In the function drawBackground(QPainter *painter, const QRectF &amp;) i call the function paintGL.</p> <pre><code>void OpenGLScene::drawBackground(QPainter *painter, const QRectF &amp;) { if (painter-&gt;paintEngine()-&gt;type() != QPaintEngine::OpenGL &amp;&amp; painter-&gt;paintEngine()-&gt;type() != QPaintEngine::OpenGL2) { qWarning("OpenGLScene: drawBackground needs a QGLWidget to be set as viewport on the graphics view"); return; } painter-&gt;beginNativePainting(); glClearColor(m_backgroundColor.redF(), m_backgroundColor.greenF(), m_backgroundColor.blueF(), 1.0f); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); if (m_model) { m_model-&gt;paintGL(); } painter-&gt;endNativePainting(); </code></pre> <p>}</p> <p>Simple drawing and stuff works fine. I only get problems until i try to load *.obj-Files. I have tried several things, which didnt work. Now I ended up with the solution to define all the functions from the model-class(which you can find in the example) in my glWidget-Class and then calling the render-function in paintGL. Afterwards calling the paintGL in OpenGLScene.</p> <p>Here you can see my header-files: OpenGLScene.h and GLWidget.h:</p> <pre><code>class GLWidget : public QGLWidget { Q_OBJECT public: float m_distance; GLWidget(const QString &amp;filePath); GLWidget(QWidget *parent = 0); ~GLWidget(); QSize minimumSizeHint() const; QSize sizeHint() const; void initializeGL(); void paintGL(); void resizeGL(int width, int height); void render() const; QString fileName() const { return m_fileName; } int faces() const { return m_pointIndices.size() / 3; } int edges() const { return m_edgeIndices.size() / 2; } int points() const { return m_points.size(); } QString m_fileName; QVector&lt;Point3d&gt; m_points; QVector&lt;Point3d&gt; m_normals; QVector&lt;int&gt; m_edgeIndices; QVector&lt;int&gt; m_pointIndices; }; #ifndef QT_NO_CONCURRENT #include &lt;QFutureWatcher&gt; #endif class GLWidget; class OpenGLScene : public QGraphicsScene { Q_OBJECT public: OpenGLScene(); void drawBackground(QPainter *painter, const QRectF &amp;rect); QDialog *createDialog(const QString &amp;windowTitle) const; void setModel(GLWidget *model); //Model *m_model; GLWidget *m_model; QColor m_backgroundColor; float m_distance; QLabel *m_labels[4]; QWidget *m_modelButton; #ifndef QT_NO_CONCURRENT QFutureWatcher&lt;GLWidget *&gt; m_modelLoader; #endif public slots: void loadModel(); void loadModel(const QString &amp;filePath); void modelLoaded(); }; </code></pre> <p>Unfortunately this idea isnt working, because i get this error:</p> <p>"It is not safe to use pixmaps outside the GUI thread"</p> <p>But I really dont understand whats that supposed to mean.</p>
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    1. COHm…Maybe I should specify it more. My first question would be why it is a problem to define the modelfunctions in glwidget? GLWidget’s content is the same as the model-class content plus some extras. Therefore I dont understand the error: “It is not safe to use pixmaps outside the GUI thread” Because in the OpenGLScene-Class I have nothing changed except the datatype-names. I’ve replaced Model-datatype to GLWidget-datatype. Maybe someone would be able to help me? Or is it so obvious that it is to easy to answer. If so I would be happy if you could share your ideas with me.
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    2. COFor all of you who have maybe tried the code from the upper link. I am sorry but this is an old version which is not working. Here is the [new one](http://qt.gitorious.org/qt-labs/modelviewer) Sorry
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