Change font display position based on point coordinates

StackOverflow method Found: http://stackoverflow.com/questions/11714298/ d3dxvec3project-requiring-half-the-object-position/11762956#11762956

Yesterday tried several methods, all ineffective, maybe I am stupid ...

In a nutshell, use the D3dxvec3project function to find the projection position of the point in the screen based on the position of the midpoint of the world coordinate system, and then draw the font at that location.

　　

1 D3dxvector3 cmfc_d3dview::toscreenspace (d3dxvector3 position)2 {   3D3dxvector3 out;4 D3dviewport9 view;5 D3dxmatrix Matview;6 D3dxmatrix Matworld;7 D3dxmatrix matproj;8 D3dxmatrix Worldpos;9 D3dxmatrix Worldrotx;Ten D3dxmatrix Worldroty; One D3dxmatrix Worldrotz; A D3dxmatrix WORLDSCL; -  -_device->getviewport (&view);//view in debug are showing all the correct values. the_device->gettransform (D3dts_view, &matview);//view is set each frame from the camera -_device->gettransform (D3dts_projection, &matproj);//This was set once in the scene manager -D3DXMatrixIdentity (&matworld); -     //d3dxmatrixtranslation (&matworld, position.x, POSITION.Y, position.z);//uses the given position for the world matrix +  -D3dxvec3project (& out, &position, &view, &matproj, &matview, &matworld); +  A     return  out; at}

The problem with Stacoverflow is that the position of the display font is not the same as expected, because he changed the world Matrix Matworld because the second parameter of the D3dvec3project function has already specified the position of the point, So the input of the world coordinate matrix should be the unit matrix will not appear error, so I will matworld unit a bit, and then in the draw point of the loop to add

　　

1         D3dxvector3 POut; 2         D3dxvector3 pIn = D3dxvector3 (m_pointlist[i].x,m_pointlist[i].y,m_pointlist[i].z); 3         POut = toscreenspace (pIn); 4         SetRect (&RC, Pout.x,pout.y, pout.x+, pout.y+  ); 5         M_pfont->drawtexta (0"HelloWorld",-10, White);

The complete code is like this.

　　

1 voidCmfc_d3dview::D rawpointusingsphere ()2 {3     4_device->BeginScene ();5      for(inti =0; I<m_pointlist.size (); i++)6     {7_device->setmaterial (&Red_mtrl);8_device->settransform (d3dts_world,&m_matrixofpoint[i]);9M_objectofpoint[i]->drawsubset (0)///Draw the ball (I am the point of the ball instead)Ten          One  A D3dxvector3 POut; -D3dxvector3 pIn =D3dxvector3 (m_pointlist[i].x,m_pointlist[i].y,m_pointlist[i].z); -POut =Toscreenspace (pIn); theSetRect (&AMP;RC, Pout.x,pout.y, pout.x+ Max, pout.y+ - ); -M_pfont->drawtexta (0,"Hello World", -1, &AMP;RC,0, white);//Display text -  -  +          -          +     } A_device->EndScene (); at  -      -}

　　

　　

Change font display position based on point coordinates