qwtwheel doesn't draw tick marks and is unresponsive

[mavxb3]

Hi, I have Qt 4.8.2 and qwt 6.0.1 installed through macports on my mac which is running snow leopard(10.6.8).

I have all the qwt widgets in Qt Designer, but when I try to add a wheel there are no tick marks no matter how I play with the variables.

Then if I compile and run my project with the qwtwheel(I have no problems here and everything seems to link fine since I get no errors), it still doesn't draw right (no tick marks) and is completely unresponsive to mouse clicks/drags. No matter what signal/slot connections I set up, it does nothing. I don't think it even moves, but it is hard to tell with no tick marks. I tried using the qwtSlider and that worked just fine.

Any ideas?

[Uwe]

Compare your code with how the wheel is used in the radio and event_filter examples.

Uwe

[mavxb3]

Compare your code with how the wheel is used in the radio and event_filter examples.

Uwe

Thank you for your reply. My code is generated by Qt Designer but even so I still checked it against the examples and nothing seems out of the ordinary. It includes qwt_wheel.h, initializes it, and adds it to the interface. It just seems that the wheel doesn't work like some of its source code is undefined...

#ifndef UI_USERINTERFACE_H
#define UI_USERINTERFACE_H
 
...
 
#include "qwt_wheel.h"
 
QT_BEGIN_NAMESPACE
 
class Ui_UserInterface
{
public:
 
   ...
 
   QwtWheel *yWheel;
 
   ...
 
   void setupUi(QMainWindow *UserInterface)
   {
 
      ...
 
      yWheel = new QwtWheel(worldView);
      yWheel->setObjectName(QString::fromUtf8("yWheel"));
      horizontalLayout_3->addWidget(yWheel);
 
      ...
   }
etc...

#ifndef UI_USERINTERFACE_H
#define UI_USERINTERFACE_H

...

#include "qwt_wheel.h"

QT_BEGIN_NAMESPACE

class Ui_UserInterface
{
public:

   ...

   QwtWheel *yWheel;

   ...

   void setupUi(QMainWindow *UserInterface)
   {

      ...

      yWheel = new QwtWheel(worldView);
      yWheel->setObjectName(QString::fromUtf8("yWheel"));
      horizontalLayout_3->addWidget(yWheel);

      ...
   }
etc...

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It ends up looking like this and it won't move or respond to anything:
Screen shot 2012-08-31 at 4.25.46 PM.png

[Uwe]

At least you have to set a range ( the default setting is an invalid one ): f.e yWheel->setRange( 0.0, 100.0 );

Uwe

[mavxb3]

At least you have to set a range ( the default setting is an invalid one ): f.e yWheel->setRange( 0.0, 100.0 );

Uwe

Thank you, that fixed it. The range really shouldn't be initialized to something invalid, that's confusing. That's probably why it also doesn't look right in Qt Designer...