Qt-interest Archive, April 2008
drwing an arc
Message 1 in thread
Hello,
Is it possible to draw an arc of circle with three points:
start_point(xs,ys)
end_point(xe,ye)
center_circle(xc,yc)
If yes how can I do that? If not what should I do again? :)
-----------------
Mahmood Naderan
____________________________________________________________________________________
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Message 2 in thread
Mahmood Naderan wrote:
> Hello,
> Is it possible to draw an arc of circle with three points:
> start_point(xs,ys)
> end_point(xe,ye)
> center_circle(xc,yc)
>
> If yes how can I do that? If not what should I do again? :)
Look at the QPainter::drawArc() functions.
>
> -----------------
> Mahmood Naderan
>
> ------------------------------------------------------------------------
> Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try
> it now.
> <http://us.rd.yahoo.com/evt=51733/*http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
> >
--
[ signature omitted ]
Message 3 in thread
> Look at the QPainter::drawArc() functions.
according to manual:
void QPainter::drawArc ( int x, int y, int w, int h, int a, int alen )
Draws an arc defined by the rectangle (x,y,w,h), the start angle a and the arclength alen.
then it says:
The angles a and alen are 1/16th of a degree
So my question: is "alen" the arc length? or it is the degree of arc (from start to end)?
If it is "int" then 1/16th would be zero!??
---------------
Mahmood Naderan
----- Original Message ----
From: John McClurkin <jwm@xxxxxxxxxxx>
To: qt-interest@xxxxxxxxxxxxx
Sent: Tuesday, April 22, 2008 3:44:49 PM
Subject: Re: drwing an arc
Mahmood Naderan wrote:
> Hello,
> Is it possible to draw an arc of circle with three points:
> start_point(xs,ys)
> end_point(xe,ye)
> center_circle(xc,yc)
>
> If yes how can I do that? If not what should I do again? :)
Look at the QPainter::drawArc() functions.
>
> -----------------
> Mahmood Naderan
>
> ------------------------------------------------------------------------
> Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try
> it now.
> <http://us.rd.yahoo.com/evt=51733/*http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
> >
--
[ signature omitted ]
Message 4 in thread
Hi,
> according to manual:
> void QPainter::drawArc ( int x, int y, int w, int h, int a, *int alen* )
Which version of the Qt documentation are you looking at?
The current documentation reads:
[...]
The startAngle and spanAngle must be specified in 1/16th of a degree,
i.e. a full circle equals 5760 (16 * 360). Positive values for the
angles mean counter-clockwise while negative values mean the clockwise
direction. Zero degrees is at the 3 o'clock position.
[...]
void QPainter::drawArc(int x, int y, int width, int height, int
startAngle, int spanAngle)
--
[ signature omitted ]
