[Qt-interest] Changin the pen width for QGLWidget

[Ross Driedger]

On Fri, 04 Dec 2009 01:35:38 -0500, <qt-interest-request at trolltech.com>  
wrote:


> I am trying to change the width of the pen which is currently used by the
> paintEngine() in QGLWidget. For a particular object being drawn I want to
> increase the width.But it gives error see below.
> ////////////////////////////////////////////////
> paintEngine()->painter()->pen().setWidth(8);
> paintEngine()->painter()->pen().setColor(trolltechPurple);
> //errors
> rc/graphicsview_mesh.cpp:852: error: passing `const QPen' as `this'  
> argument
> of `void QPen::setWidth(int)' discards qualifiers
> src/graphicsview_mesh.cpp:853: error: passing `const QPen' as `this'
> argument of `void QPen::setColor(const QColor&)' discards qualifiers

I can't tell exactly what the problem in your code is, but if you come  
across: "...discards qualifiers", this usually means you are passing a  
const object (or reference or pointer) to a function that is expecting or  
needing to be non-const.

-- 
"My music is not difficult, my music is played badly."
Arnold Schoenberg

Ross Driedger
ross_at_earz.ca