Hi , glViewport specifies the affine transformation of x and y from normalized device coordinates to window coordinates and could be different than size of the widget. Try setting it to (w/2 , h/2 ) and (2*w, 2*h) to see the difference. You could zoom in or out using viewport with same widget size. (0,0 ) is the lower left corner of the viewport rectangle
~Prashant On Fri, Jul 10, 2009 at 7:41 PM, jyotigoyal <[email protected]> wrote: > > > Hi > I am new to gtkglext trying to run some simple sample programs. > In gtkglext, we create a drawing area as a widget and then set the size of > the viewport using glviewport().Is the size of the drawing area not same as > the size of the viewport? If not,then y? why would anyone make the size of > drawing area and viewport different when viewport is also used to limit the > size of drawing area? > Also where is the coordinate (0,0) located on a window in this case? > for gtk applications,it is located at top left corner.for gtkglext,where is > it located? I am getting confused with the negative coordinates used in > glviewport and glrectf and similar fns. > -- > View this message in context: > http://www.nabble.com/glViewport-query-tp24425119p24425119.html > Sent from the Gnome - GtkGLExt mailing list archive at Nabble.com. > > _______________________________________________ > gtkglext-list mailing list > [email protected] > http://mail.gnome.org/mailman/listinfo/gtkglext-list >
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