void ccHObject::drawNameIn3D(CC_DRAW_CONTEXT& context)
{
if (!context.display)
return;
//we display it in the 2D layer in fact!
ccBBox bBox = getOwnBB();
if (!bBox.isValid())
return;
ccGLMatrix trans;
getAbsoluteGLTransformation(trans);
ccGLCameraParameters camera;
context.display->getGLCameraParameters(camera);
CCVector3 C = bBox.getCenter();
CCVector3d Q2D;
camera.project(C, Q2D);
QFont font = context.display->getTextDisplayFont(); //takes rendering zoom into account!
context.display->displayText( getName(),
static_cast<int>(Q2D.x),
static_cast<int>(Q2D.y),
ccGenericGLDisplay::ALIGN_HMIDDLE | ccGenericGLDisplay::ALIGN_VMIDDLE,
0.75f,
0,
&font);
}
ccBBox ccHObject::getDisplayBB_recursive(bool relative, const ccGenericGLDisplay* display/*=0*/)
{
ccBBox box;
if (!display || display == m_currentDisplay)
box = getOwnBB(true);
for (Container::iterator it = m_children.begin(); it != m_children.end(); ++it)
{
if ((*it)->isEnabled())
{
ccBBox childBox = (*it)->getDisplayBB_recursive(true, display);
if ((*it)->isGLTransEnabled())
{
childBox = childBox * (*it)->getGLTransformation();
}
box += childBox;
}
}
if (!relative && box.isValid())
{
//get absolute bounding-box?
ccGLMatrix trans;
getAbsoluteGLTransformation(trans);
box = box * trans;
}
return box;
}
//====================================================drawNameIn3D======================================//
void ccHObject::drawNameIn3D(CC_DRAW_CONTEXT& context)
{
//绘制窗口
if (!context._win)return;
//we display it in the 2D layer in fact!
ccBBox bBox = getOwnBB();
if (bBox.isValid()){
ccGLMatrix trans;
getAbsoluteGLTransformation(trans); //得到由祖先到当前物体的变换矩阵
const double* MM = context._win->getModelViewMatd(); //viewMat //模型视图矩阵
const double* MP = context._win->getProjectionMatd(); //projMat //投影矩阵
int VP[4];
context._win->getViewportArray(VP); //视口参数
GLdouble xp,yp,zp;
CCVector3 C = bBox.getCenter(); //BB的中心为之
trans.apply(C); //实际的位置和显示的位置不同，将变换矩阵作用到中心位置上
gluProject(C.x,C.y,C.z,MM,MP,VP,&xp,&yp,&zp); //根据视图矩阵，投影矩阵和视口参数对BB中心点进行投影
QFont font = context._win->getTextDisplayFont(); //takes rendering zoom into account! //获取字体
//在2D屏幕上显示文本
context._win->displayText( getName(),
static_cast<int>(xp),
static_cast<int>(yp),
ccGenericGLDisplay::ALIGN_HMIDDLE | ccGenericGLDisplay::ALIGN_VMIDDLE,
0.75f,
0,
&font);
}
}
bool ccGenericPointCloud::isClicked(const CCVector2d& clickPos,
int& nearestPointIndex,
double& nearestSquareDist,
const double* MM,
const double* MP,
const int* VP,
double pickWidth/*=2.0*/,
double pickHeight/*=2.0*/)
{
ccGLMatrix trans;
bool noGLTrans = !getAbsoluteGLTransformation(trans);
//back project the clicked point in 3D
CCVector3d clickPosd(clickPos.x, clickPos.y, 0);
CCVector3d X(0,0,0);
ccGL::Unproject<double, double>(clickPosd, MM, MP, VP, X);
nearestPointIndex = -1;
nearestSquareDist = -1.0;
#if defined(_OPENMP)
#pragma omp parallel for
#endif
//brute force works quite well in fact?!
for (unsigned i=0; i<size(); ++i)
{
const CCVector3* P = getPoint(i);
CCVector3d Qs;
if (noGLTrans)
{
ccGL::Project<PointCoordinateType, double>(*P,MM,MP,VP,Qs);
}
else
{
CCVector3 Q = *P;
trans.apply(Q);
ccGL::Project<PointCoordinateType, double>(Q,MM,MP,VP,Qs);
}
if (fabs(Qs.x-clickPos.x) <= pickWidth && fabs(Qs.y-clickPos.y) <= pickHeight)
{
double squareDist = CCVector3d(X.x-P->x, X.y-P->y, X.z-P->z).norm2d();
if (nearestPointIndex < 0 || squareDist < nearestSquareDist)
{
nearestSquareDist = squareDist;
nearestPointIndex = static_cast<int>(i);
}
}
}
return (nearestPointIndex >= 0);
}
