zoom centre

a-helcman's picture
a-helcman
Thu, 01/20/2005 - 11:33
Forums: 
Other usage issues

hi,

is it possible to zoom the view from the point different from the centre? zoom function of v3d_view doesn't contain a parameter of this zooming origin. is there some way how it can be set?

best regards,
adrian

a-helcman's picture
a-helcman
Wed, 02/09/2005 - 13:27

trick:
1. pan from the zoom-centre-point to the centre of window,
2. zoom,
3. pan back from the centre of window to the the zoom-centre-point.

GetClientRect (o_cl_rect);
GetView()->SetImmediateUpdate (false);
GetView()->Pan (o_cl_rect.Width()/2.0-pt.x, pt.y-o_cl_rect.Height()/2.0);
GetView()->Zoom(...);
GetView()->SetImmediateUpdate (true);
GetView()->Pan (pt.x-o_cl_rect.Width()/2.0, o_cl_rect.Height()/2.0-pt.y);