LCOV - code coverage report
Current view: top level - gui/source - arcball.cpp (source / functions) Hit Total Coverage
Test: mcrl2_coverage.info.cleaned Lines: 0 29 0.0 %
Date: 2020-02-28 00:44:21 Functions: 0 3 0.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : // Author(s): Johannes Altmanninger
       2             : // Copyright: see the accompanying file COPYING or copy at
       3             : // https://github.com/mCRL2org/mCRL2/blob/master/COPYING
       4             : //
       5             : // Distributed under the Boost Software License, Version 1.0.
       6             : // (See accompanying file LICENSE_1_0.txt or copy at
       7             : // http://www.boost.org/LICENSE_1_0.txt)
       8             : 
       9             : #include "mcrl2/gui/arcball.h"
      10             : 
      11             : #include "mcrl2/gui/glu.h"
      12             : 
      13             : #ifdef MCRL2_PLATFORM_MAC
      14             :   #include <GLKit/GLKMatrix4.h>
      15             : #endif
      16             : 
      17             : #ifndef M_PI
      18             :   #define M_PI 3.14159265358979323846264338327950288
      19             : #endif
      20             : 
      21             : namespace mcrl2
      22             : {
      23             : namespace gui
      24             : {
      25             : 
      26             : /// \brief Compute the projection of the point p on a sphere that covers the viewport
      27           0 : static QVector3D arcballVector(const QPoint& p)
      28             : {
      29             :   float x, y, z;
      30           0 :   const float radius = 1.5f;
      31             :   GLint viewport[4];
      32           0 :   glGetIntegerv(GL_VIEWPORT, viewport);
      33             : 
      34             :   // Compute x and y relative to the middle of the viewport
      35           0 :   x = (float)p.x() / viewport[2] * 2.0f - 1.0f;
      36           0 :   y = (float)p.y() / viewport[3] * 2.0f - 1.0f;
      37           0 :   y = -y;
      38             : 
      39           0 :   float squared = x * x + y * y;
      40           0 :   if (squared <= radius * radius)
      41             :   {
      42           0 :     z = std::sqrt(radius * radius - squared);
      43             :   }
      44             :   else
      45             :   {
      46           0 :     float len = std::sqrt(squared);
      47           0 :     if (std::isnormal(len))
      48             :     {
      49           0 :       x /= len;
      50           0 :       y /= len;
      51             :     }
      52             :     else
      53             :     {
      54           0 :       x = 0.0f;
      55           0 :       y = 0.0f;
      56             :     }
      57           0 :     z = 0.0f;
      58             :   }
      59           0 :   return QVector3D(x, y, z).normalized();
      60             : }
      61             : 
      62           0 : QQuaternion arcballRotation(const QPoint& p1, const QPoint& p2)
      63             : {
      64             :   // update rotation based on the difference in mouse coordinates
      65           0 :   QVector3D v1 = arcballVector(p1).normalized();
      66           0 :   QVector3D v2 = arcballVector(p2).normalized();
      67           0 :   QVector3D cross = QVector3D::crossProduct(v1, v2);
      68           0 :   float dot = QVector3D::dotProduct(v1, v2);
      69           0 :   return QQuaternion(dot, cross);
      70             : }
      71             : 
      72           0 : void applyRotation(const QQuaternion& rotation, bool reverse)
      73             : {
      74           0 :   float angle = 180 / M_PI * std::acos(std::min(1.0f, rotation.scalar()));
      75           0 :   if (reverse)
      76             :   {
      77           0 :     angle = -angle;
      78             :   }
      79             :   // not sure why the angle has to be doubled
      80           0 :   glRotatef(2 * angle, rotation.x(), rotation.y(), rotation.z());
      81           0 : }
      82             : 
      83             : } // namespace gui
      84             : } // namespace mcrl2

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