About algorithm render tachometer gauge on embedded catalog example and demo

Reply to About algorithm render tachometer gauge on embedded catalog example and demo on Sun, 25 Sep 2011 20:07:16 GMT

Franzk — Sun, 25 Sep 2011 20:07:16 GMT

[quote author="banlinhtienphong" date="1316958365"]I still don't understand why make sure y is between 0 and 1?[/quote] I assume the coordinates need to be defined within the square (0.0,0.0)-(1.0,1.0). If that's the case, they're making sure the needle origin is within sight.

[quote author="banlinhtienphong" date="1316958365"]
I think 0.486 and 0.466 not "it probably looks best..."
anyone can explain for me?[/quote]What don't you understand? Do you not understand why the needle origin is just a tad off-center (so not (0.5, 0.5))? Do you not understand what the needle origin is to begin with?

It seems you're a non-native English speaker, and I understand that can make it harder to write, but please try to state what exactly you're having trouble with.

Reply to About algorithm render tachometer gauge on embedded catalog example and demo on Sun, 25 Sep 2011 13:46:05 GMT

banlinhtienphong — Sun, 25 Sep 2011 13:46:05 GMT

I still don't understand why make sure y is between 0 and 1?
I think 0.486 and 0.466 not "it probably looks best..."
anyone can explain for me?

Reply to About algorithm render tachometer gauge on embedded catalog example and demo on Sun, 25 Sep 2011 12:12:55 GMT

Franzk — Sun, 25 Sep 2011 12:12:55 GMT

@
void QtSvgDialGauge::setNeedleOrigin(qreal x, qreal y)
{
// make sure x is between 0 and 1
m_originX = qMin( // originX = the smaller value of
static_cast(1.0), // 1 and
qMax( // the bigger value of
static_cast(0.0), // 0 and
x)); // x

// make sure y is between 0 and 1
m_originY = qMin(static_cast(1.0), qMax(static_cast(0.0), y));

[quote]
@// Tachometer
QtSvgDialGauge *gauge = new QtSvgDialGauge(group);
gauge->setSkin("Tachometer");
gauge->setNeedleOrigin(0.486, 0.466);
@

why is 0.486 and 0.466
[/quote]
It probably looks best...