broken Rotation and some clipping bugs

A1/hellocube/cubewidget.cpp

@@ -43,13 +43,16 @@ void CubeWidget::paintGL ( )
 {
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
     glLoadIdentity();
+
     glTranslatef(0.0f,0.0f,-zoom);
+
     QMatrix4x4 mat = QMatrix4x4();
     mat.rotate(*rotation);
     glMultMatrixf(mat.data());
 
 
 
+
     GLfloat red[] = {1.0,0.0,0.0};
     GLfloat green[] = {0.0,1.0,0.0};
     GLfloat blue[] = {0.0,0.0,1.0};
@@ -123,6 +126,8 @@ void CubeWidget::paintGL ( )
     glEnd();
 }
 
+
+
 void CubeWidget::resizeGL(int width , int height )
 {
     glMatrixMode(GL_PROJECTION);
@@ -153,7 +158,7 @@ void CubeWidget::showWireframe()
 
     qDebug("show Wireframe");
     glShadeModel(GL_FLAT);
-    glDisable(GL_CULL_FACE);
+   // glDisable(GL_CULL_FACE);
 
     glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
     updateGL();
@@ -163,7 +168,7 @@ void CubeWidget::showFlat()
 {
     qDebug("show Flat");
     glShadeModel(GL_FLAT);
-    glEnable(GL_CULL_FACE);
+   // glEnable(GL_CULL_FACE);
     glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
     updateGL();
 }
@@ -172,7 +177,7 @@ void CubeWidget::showGouraut()
 {
     qDebug("show Gouraut");
     glShadeModel(GL_SMOOTH);
-    glEnable(GL_CULL_FACE);
+  //  glEnable(GL_CULL_FACE);
     glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
     updateGL();
 }
@@ -201,11 +206,73 @@ void CubeWidget::home()
 void CubeWidget::mousePressEvent(QMouseEvent *event )
 {
 
+   // if (event->isAccepted())
+   //     return;
+
+    if (event->buttons() & Qt::LeftButton) {
+        qDebug("press");
+        lastPos = trackballPoint(event->pos().x(),event->pos().y());
+
+
+        event->accept();
+    } else {
+    }
+
 }
 
 void CubeWidget::mouseMoveEvent(QMouseEvent *event )
 {
+
     //http://web.cse.ohio-state.edu/~hwshen/781/Site/Slides_files/trackball.pdf
+    //http://doc.qt.io/qt-5/qtwidgets-graphicsview-boxes-example.html
+
+   // if (event->isAccepted())
+    //    return;
+
+    if (event->buttons() & Qt::LeftButton) {
+         qDebug("move");
+        move(trackballPoint(event->pos().x(),event->pos().y()));
+
+        //m_trackBalls[0].move(pixelPosToViewPos(event->scenePos()), m_trackBalls[2].rotation().conjugate());
+        event->accept();
+    } else {
+        //m_trackBalls[0].release(pixelPosToViewPos(event->scenePos()), m_trackBalls[2].rotation().conjugate());
+    }
+}
+
+void CubeWidget::move(QVector3D *newPos )
+{
+     QVector3D axis = QVector3D::crossProduct(*lastPos,*newPos);
+
+     //warum so besser
+     float angle = 180 / M_PI * std::asin(std::sqrt(QVector3D::dotProduct(axis, axis)));
+     axis.normalize();
+
+     axis = rotation->conjugate().rotatedVector(axis);
+     QQuaternion newRot = QQuaternion::fromAxisAndAngle(axis, angle) * *rotation;
+     rotation = new QQuaternion(newRot.toVector4D());
+
+     lastPos = newPos;
+     updateGL();
+
+}
+
+QVector3D* CubeWidget::trackballPoint(int x, int y){
+    float xo,yo,zo;
+
+    qDebug()<<"x:"<< x << " y:"<<y;
+    xo = ((2.0*x)-width())/ height();
+    yo = (height()-(2.0*y))/width();
+
+    float d = sqrt(xo*xo+yo*yo);
+    zo = qMax(qCos(M_PI_2*d),qreal(0.0)); //qMin(d,1.0f)
+
+
+
+    QVector3D *pos = new QVector3D(xo,yo,zo);
+    pos->normalize();
+    qDebug()<<"x:"<< xo << " y:"<<yo<<" z:"<<zo;
+    return pos;
 }
 
 void CubeWidget::wheelEvent(QWheelEvent *event )

A1/hellocube/cubewidget.h

@@ -8,6 +8,8 @@
 #include <math.h>
 #include <QMatrix4x4>
 #include <QQuaternion>
+#include <QVector3D>
+#include <algorithm>
 
 
 
@@ -41,9 +43,13 @@ private:
     int tesselation;
     int zoom;
     QQuaternion *rotation;
-    QPoint *lastPos;
+    QVector3D *lastPos;
+    bool mousDown = false;
+
     void perspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar);
     void setMaterial(GLfloat *color );
+    void move(QVector3D *newPos );
+    QVector3D *trackballPoint(int x, int y);
 };
 
 #endif // CUBEWIDGET_H