gluProject (centerX, centerY + cSize / yScale, 0, modelMatrix, projMatrix, viewport, &winxN, &winyN, &winz);
gluProject (centerX + cSize / xScale, centerY, 0, modelMatrix, projMatrix, viewport, &winxE, &winyE, &winz);
gluProject (centerX, centerY - cSize / yScale, 0, modelMatrix, projMatrix, viewport, &winxS, &winyS, &winz);
gluProject (centerX - cSize / xScale, centerY, 0, modelMatrix, projMatrix, viewport, &winxW, &winyW, &winz);
gluProject (centerX, centerY + cSize / yScale, 0, modelMatrix, projMatrix, viewport, &winxN, &winyN, &winz);
gluProject (centerX + cSize / xScale, centerY, 0, modelMatrix, projMatrix, viewport, &winxE, &winyE, &winz);
gluProject (centerX, centerY - cSize / yScale, 0, modelMatrix, projMatrix, viewport, &winxS, &winyS, &winz);
gluProject (centerX - cSize / xScale, centerY, 0, modelMatrix, projMatrix, viewport, &winxW, &winyW, &winz);