Re: Bug in Graphics output of Circle primitive?

*To*: mathgroup at smc.vnet.net*Subject*: [mg62889] Re: Bug in Graphics output of Circle primitive?*From*: "Jean.Pellegri" <Jean.Pellegri at wanadoo.fr>*Date*: Thu, 8 Dec 2005 00:04:15 -0500 (EST)*References*: <dn5o7s$nih$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Bonjour Problem scaling In[132]:= r = 10000; gx = Circle[{r, 0}, r, {179Pi/180, Pi}]; Show[Graphics[{Hue[0.5],gx,PointSize[0.02],Hue[0.8],Point[{0, 0}]}], Axes -> False, PlotRange -> {{-1,1}, {-1,1}}]; The graph is OK Jean Pellegri "Yves Klett" <yk at despammed.com> a écrit dans le message de news: dn5o7s$nih$1 at smc.vnet.net... > Dear Mathgroup, > > I stumbled upon a strange (and suspicious) graphics output when > displaying arcs with small angular length. > > If I evaluate the following lines: > > r = 10000; > gx = Circle[{r, 0}, r, {179°, 180°}]; > Show[Graphics[{gx, Point[{0, 0}]}], Axes -> True, > PlotRange -> {Automatic, Automatic}, AxesOrigin -> {0, 0}]; > > (or the same in plain text format...) > > r=10000; > gx=Circle[{r,0},r,{179\[Degree],180\[Degree]}]; > Show[Graphics[{gx,Point[{0,0}]}],Axes\[Rule]True, > PlotRange\[Rule]{Automatic,Automatic},AxesOrigin\[Rule]{0,0}]; > > > I get the point as specified at the origin {0,0}. The arc though does > not intersect at the origin as it should IMHO, but somewhat left of it. > Same thing occurs for arbitrary values of r. > > There might be some precision problem of the postscript output > concerning the Circle primitive when very different axes scaling is > used, but any enlightment would be appreciated. > > I am using V5.2 on windows. Any hints or tips to get rid of this faulty > output would be very welcome, > > Yves Klett >