Home » Developing U++ » UppHub » Knob control
| Re: Knob control [message #28137 is a reply to message #27950] |
Wed, 18 August 2010 15:00   |
jerson
Messages: 202
Registered: June 2010
Location: Bombay, India
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Experienced Member |
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Hi Koldo
I think I caught some bugs on the knob USC. SetMajorMarks to 3, SetMinorMarks to 4 and the widget display is wrong. However, the CPP paint does its job well. Same way, set SetMajorMarks to 4, SetMinorMarks to 5 and the USC code crashes.
Another minor suggestion, I would define major and minor marks differently like this; but, that's my opinion.
MajorTickInterval and MinorTickInterval so user can decide the tick interval in terms of a quantum of the range. MajorTickinterval of 25 means a major tick every 25 counts of the range and minortick of 5 means a dot every 5 counts of the range
I've done something like that in the slider.cpp file I uploaded on the slider thermometer thread.
this is the relevant paint code
// draw gradations
for( int i = Min();
( m_nMajorTicks > 0 ) && ( i <= Max() ) ;
i += ( m_nMinorTicks == 0 ? m_nMajorTicks : m_nMinorTicks ) ) {
int nPos = SliderToClient( i );
if( ( m_nMajorTicks != 0 ) && ( i % m_nMajorTicks ) == 0 )
DrawTick( w, MAJOR, (HOVE)HoVe( HORZ, VERT ), nPos, i );
else if( ( m_nMinorTicks != 0 ) && ( i % m_nMinorTicks ) == 0 )
DrawTick( w, MINOR, (HOVE)HoVe( HORZ, VERT ), nPos, i );
}
Best Regards
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| Re: Knob control [message #28141 is a reply to message #28140] |
Wed, 18 August 2010 17:09 |
jerson
Messages: 202
Registered: June 2010
Location: Bombay, India
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Experienced Member |
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| koldo wrote on Wed, 18 August 2010 20:31 |
I understand the algorithm but I do not know the reason. Why to have MajorTickinterval, MinorTickInterval and range instead of simply MajorTickinterval and MinorTickInterval?
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Simply MajorTickInterval and MinorTickInterval should be fine. Range is nothing more than Min & Max and stays as it is.
An example. If I have Max = 100, MinorTickInterval = 5 and MajorTickInterval = 20, I will get minor marks at 5,10,15, major mark at 20, minor at 25,30,35, major at 40 and so on. Only reason I suggested this arrangement is it is easier to understand while designing the UI.
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| Re: Knob control [message #28148 is a reply to message #28141] |
Wed, 18 August 2010 22:27 |
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koldo
Messages: 3356
Registered: August 2008
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Senior Veteran |
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| jerson wrote on Wed, 18 August 2010 17:09 |
| koldo wrote on Wed, 18 August 2010 20:31 |
I understand the algorithm but I do not know the reason. Why to have MajorTickinterval, MinorTickInterval and range instead of simply MajorTickinterval and MinorTickInterval?
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Simply MajorTickInterval and MinorTickInterval should be fine. Range is nothing more than Min & Max and stays as it is.
An example. If I have Max = 100, MinorTickInterval = 5 and MajorTickInterval = 20, I will get minor marks at 5,10,15, major mark at 20, minor at 25,30,35, major at 40 and so on. Only reason I suggested this arrangement is it is easier to understand while designing the UI.
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Oh. In fact the first version was like this, like in Meter.
If everything agrees I will implement it tomorrow.
Best regards
Iñaki
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