// if viewframe left and top coordinates are non zero value then exclude it
    // during the computation of xRatio and yRatio
    xRatio = (inPos.x - viewFrame.left)/actualWidth;
    yRatio = (inPos.y - viewFrame.top)/actualHeight;
    // Use viewframe width and height to compute wRatio and hRatio.
    wRatio = (float)inPos.w/(float)(viewFrame.right - viewFrame.left);
    hRatio = (float)inPos.h/(float)(viewFrame.bottom - viewFrame.top);