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Re: Output display by slide

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131771] Re: Output display by slide
  • From: "Dr. Wolfgang Hintze" <weh at snafu.de>
  • Date: Wed, 2 Oct 2013 05:53:16 -0400 (EDT)
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Am Dienstag, 1. Oktober 2013 12:21:19 UTC+2 schrieb Narasimham:
> a=3; b=2.5;  c=2 ;
> 
> (*  Given triangle vertices are {(0,0),(x1,y1),(x2,y2)} = { (0,0),(a,0),(b,c) } to find CG  *)
> 
> v1=Graphics[Circle[{0,0},{.03,.03}]];v2=Graphics[Circle[{a,0},{.03,.03}]];v3=Graphics[Circle[{b,c},{.03,.03}]]; 
> 
> x1=a;y1=0;x2=b;y2=c; {XF,YF}={x1+x2, y1+y2}/3;
> 
> CG=Graphics[Disk[{XF,YF},{.05,.05} ]];
> 
> Triang=Graphics[Line[{{0,0},{a,0},{b,c},{0,0},{XF,YF},{a,0},{XF,YF},{b,c},{XF,YF},{0,0}}] ] ;
> 
> bb=Show[{v1,v2,v3,Triang,CG},GridLines->Automatic,Axes-> True ,AspectRatio-> Automatic, PlotLabel-> "Centre of Gravity"] 
> 
> 
> 
> How  to vary b value in a SlideView or Manipulate, say between 0 to 4, (along horizontal line y =2) to display Centre of Gravity  like it is in GSP or in Java mode ?  
> 
> 
> 
> TIA,
> 
> Narasimham

Did you mean something like this?

a = 3; c = 6; 
Manipulate[v1 = Graphics[Circle[{0, 0}, {0.03, 0.03}]]; 
 v2 = Graphics[Circle[{a, 0}, {0.03, 0.03}]]; 
 v3 = Graphics[Circle[{b, c}, {0.03, 0.03}]]; 
 x1 = a; y1 = 0; x2 = b; y2 = c; 
 {XF, YF} = {x1 + x2, y1 + y2}/3; 
 CG = Graphics[Disk[{XF, YF}, {0.05, 0.05}]]; 
 Triang = 
  Graphics[Line[{{0, 0}, {a, 0}, {b, c}, {0, 0}, {XF, YF}, {a, 
      0}, {XF, YF}, {b, c}, {XF, YF}, {0, 0}}]]; 
    bb = Show[{v1, v2, v3, Triang, CG}, 
   PlotRange -> {{0, 4}, {0, 6}}, GridLines -> Automatic, 
   Axes -> True, AspectRatio -> Automatic, 
   PlotLabel -> "Centre of Gravity"], {b, 0, 4}]

Best regards,
Wolfgang



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