int BasicGlCamera::PixelAtPosition ( const QPoint &  pos )

protectedvirtual

Definition at line 810 of file BasicGlCamera.cc.

References buffer, drawCamera(), height, resizeGL(), and viewSize.

Referenced by QCameraWidget::GetObjectInfo(), QCameraWidget::mouseDoubleClickEvent(), RawDataViewer::mouseDoubleClickEvent(), QCameraWidget::mouseMoveEvent(), QCameraWidget::mousePressEvent(), and RawDataViewer::mousePressEvent().

    {
        const int MaxSize = 512;
        GLuint buffer[MaxSize];
        GLint viewport[4];

        makeCurrent();

        glGetIntegerv(GL_VIEWPORT, viewport);
        glSelectBuffer(MaxSize, buffer);
        glRenderMode(GL_SELECT);

        glInitNames();
        glPushName(0);

        glMatrixMode(GL_PROJECTION);
        glPushMatrix();
        glLoadIdentity();
        GLfloat windowRatio = GLfloat(width()) / GLfloat(height());
        gluPickMatrix(GLdouble(cPos.x()), GLdouble(viewport[3] - cPos.y()),
                1.0, 1.0, viewport);

        if (windowRatio < 1)
         {
             windowRatio = 1.0f/windowRatio;
             gluOrtho2D(-viewSize, viewSize, -viewSize*windowRatio, viewSize*windowRatio);
         }
         else
         {
             gluOrtho2D(-viewSize*windowRatio, viewSize*windowRatio, -viewSize, viewSize);
         }

        glMatrixMode(GL_MODELVIEW);
        drawCamera(false);
        glMatrixMode(GL_PROJECTION);
        glPopMatrix();

        //for some reason that I cannot understand, the push/pop matrix doesn't do the trick here... bizarre
        //ok, so re-do the resizeGL thing.
        resizeGL(width(), height());

        if (!glRenderMode(GL_RENDER))
            return -1;

        return buffer[3];
    }

Here is the call graph for this function:

Here is the caller graph for this function: