Two reflections II (intersecting lines)

From JSXGraph Wiki
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.

The JavaScript code

   var board = JXG.JSXGraph.initBoard('box', {boundingbox: [-5, 5, 5, -5], keepaspectratio:true}),
       A = board.create('point', [-2, -2], {withLabel:false}),
       B = board.create('point', [4, 0], {withLabel:false}),
       C = board.create('point', [-2, 2], {withLabel:false}),
       s = board.create('line',[A,B], {name:'s', withLabel:true}),
       t = board.create('line',[C,B], {name:'t', withLabel:true}),

       Ss = board.create('transform', [s], {type:'reflect'}),
       St = board.create('transform', [t], {type:'reflect'}),

       P1 = board.create('point', [0,-3], {name:'P_1', color:'green', size:8}),
       P2 = board.create('point', [P1, Ss], {name:'P_2', color:'green'}),
       P3 = board.create('point', [P2, St], {name:'P_3', color:'green', trace:true}),

       Q1 = board.create('point', [1,-4], {name:'Q_1', color:'blue', size:8}),
       Q2 = board.create('point', [Q1, Ss], {name:'Q_2', color:'blue'}),
       Q3 = board.create('point', [Q2, St], {name:'Q_3', color:'blue', trace:true}),

       l1 = board.create('line',[P1,Q1], {color:'black', strokeWidth:1, dash:2}),
       l2 = board.create('line',[P2,Q2], {color:'black', strokeWidth:1, dash:2}),
       l3 = board.create('line',[P3,Q3], {color:'black', strokeWidth:1, dash:2}),
       g1 = board.create('segment',[P1,P2], {color:'orange', strokeWidth:1, dash:3}),
       g2 = board.create('segment',[P2,P3], {color:'orange', strokeWidth:1, dash:3}),
       h1 = board.create('segment',[Q1,Q2], {color:'orange', strokeWidth:1, dash:3}),
       h2 = board.create('segment',[Q2,Q3], {color:'orange', strokeWidth:1, dash:3});