Drawing an arc.

[munna]

Hi,

I want to draw a few arcs but i see that the arc drawing not very consistent. Can some one please help me?

I use the following code :

paint->drawArc(left,top,15,20,16*80,16*100);
paint->drawArc(right,top,15,20,0,16*100);

paint->drawArc(left,top,15,20,16*80,16*100);
paint->drawArc(right,top,15,20,0,16*100);

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And I get the following result.



Note that for the images to be mirror of each other the two red pixels should be drawn which QPainter is not drawing. Can some one please tell me why is this happening?
Is my code right?

Thanks a lot.

[jpn]

It's caused by rounding in integer arithmetic.

If you want to make it look better, use the QPainter::drawArc() method which uses floating point precision and maybe even set antialiasing on (QPainter::setRenderHint()).

[munna]

The problem is that I currently on Qt 3.3.6.

[munna]

Any ideas on how I can solve this problem. I want a mirror image of one of them.

Thanks a lot.

[munna]

I have been try hard to solve this problem but in vain.

Can you guys help me making the mirror image of the one which is correct ?

I tried rotating the QPainter but its not working.

Pls Help
Thanks a lot

[jacek]

I tried rotating the QPainter but its not working.

You should rather scale it by (-1, 1) and then translate by (width, 0).

[munna]

You should rather scale it by (-1, 1) and then translate by (width, 0).

I tried this but scale is not working.

Pls Help

Thanks.