Difference between revisions of "Three touching circles"

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(6 intermediate revisions by the same user not shown)
Line 4: Line 4:
 
     B  = brd.create('point', [2,0]),
 
     B  = brd.create('point', [2,0]),
 
     C  = brd.create('point', [1,2]),
 
     C  = brd.create('point', [1,2]),
    a1 = brd.create('segment', [A,B], {name:'a1', withLabel:true}),
 
    a2 = brd.create('segment', [B,C], {name:'a2', withLabel:true}),
 
    a3 = brd.create('segment', [C,A], {name:'a3', withLabel:true}),
 
    c1 = brd.create('circle', [A,
 
            function(){ return A.Dist(B); }]);
 
  
      
+
     a1 = brd.create('segment', [A,B], {name:'a_1', withLabel:true, label:{position:'top'} }),
 +
    a2 = brd.create('segment', [B,C], {name:'a_2', withLabel:true, label:{position:'top'} }),
 +
    a3 = brd.create('segment', [C,A], {name:'a_3', withLabel:true, label:{position:'top'} }),
 +
    c1 = brd.create('circle',
 +
            [A,
 +
            function(){ var r1 = (C.Dist(A)-B.Dist(C)+A.Dist(B))/2.0;
 +
                        return r1; }
 +
            ]);
 +
    c2 = brd.create('circle',
 +
            [B,
 +
            function(){ return A.Dist(B)-c1.Radius(); }
 +
            ]);
 +
    c3 = brd.create('circle',
 +
            [C,
 +
            function(){ return B.Dist(C)-c2.Radius(); }
 +
            ]);
 +
</jsxgraph>
  
</jsxgraph>
+
=== The underlying JavaScript code ===
 +
 
 +
<source lang="javascript">
 +
var brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-2,5,5,-2]});
 +
var A  = brd.create('point', [0,0]),
 +
    B  = brd.create('point', [2,0]),
 +
    C  = brd.create('point', [1,2]),
 +
 
 +
    a1 = brd.create('segment', [A,B], {name:'a_1', withLabel:true, label:{position:'top'} }),
 +
    a2 = brd.create('segment', [B,C], {name:'a_2', withLabel:true, label:{position:'top'} }),
 +
    a3 = brd.create('segment', [C,A], {name:'a_3', withLabel:true, label:{position:'top'} }),
 +
    c1 = brd.create('circle',
 +
            [A,
 +
            function(){ var r1 = (C.Dist(A)-B.Dist(C)+A.Dist(B))/2.0;
 +
                        return r1; }
 +
            ]);
 +
    c2 = brd.create('circle',
 +
            [B,
 +
            function(){ return A.Dist(B)-c1.Radius(); }
 +
            ]);
 +
    c3 = brd.create('circle',
 +
            [C,
 +
            function(){ return B.Dist(C)-c2.Radius(); }
 +
            ]);
 +
</source>
 +
 
 +
[[Category:Examples]]
 +
[[Category:Geometry]]

Latest revision as of 14:14, 20 September 2012

The underlying JavaScript code

var brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-2,5,5,-2]});
var A  = brd.create('point', [0,0]),
    B  = brd.create('point', [2,0]),
    C  = brd.create('point', [1,2]),

    a1 = brd.create('segment', [A,B], {name:'a_1', withLabel:true, label:{position:'top'} }),
    a2 = brd.create('segment', [B,C], {name:'a_2', withLabel:true, label:{position:'top'} }),
    a3 = brd.create('segment', [C,A], {name:'a_3', withLabel:true, label:{position:'top'} }),
    c1 = brd.create('circle', 
            [A, 
             function(){ var r1 = (C.Dist(A)-B.Dist(C)+A.Dist(B))/2.0;
                        return r1; }
            ]);
    c2 = brd.create('circle', 
            [B, 
             function(){ return A.Dist(B)-c1.Radius(); }
            ]);
    c3 = brd.create('circle', 
            [C, 
             function(){ return B.Dist(C)-c2.Radius(); }
            ]);