Difference between revisions of "Dual lattice"

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(11 intermediate revisions by the same user not shown)
Line 1: Line 1:
 
<jsxgraph height="500" width="500" board="board"  box="box1">
 
<jsxgraph height="500" width="500" board="board"  box="box1">
brd = JXG.JSXGraph.initBoard('box1', {boundingbox: [-5, 5, 5, -5], axis:true});
+
brd = JXG.JSXGraph.initBoard('box1', {boundingbox: [-5, 5, 5, -5], axis:false});
var b1 = brd.create('point', [4,0], {size:6, name:'', color:'blue', snaptogrid: true}),
+
var b1 = brd.create('point', [4,0], {size:6, name:'1', color:'blue', snaptogrid: true}),
     b2 = brd.create('point', [3,3], {size:6, name:'', color:'blue', snaptogrid: true}),
+
     b2 = brd.create('point', [3,3], {size:6, name:'2', color:'blue', snaptogrid: true}),
 
     v1 = brd.create('arrow', [[0,0], b1], {strokeColor: 'black'}),   
 
     v1 = brd.create('arrow', [[0,0], b1], {strokeColor: 'black'}),   
 
     v2 = brd.create('arrow', [[0,0], b2], {strokeColor: 'red'}),
 
     v2 = brd.create('arrow', [[0,0], b2], {strokeColor: 'red'}),
     w1, w2;
+
     w1, w2, i, j;
 +
 
 +
 
 +
for (i=-5;i<6;i++) for (j=-5;j<6;j++) {
 +
  if (!(i==1&&j==0) && !(i==0&&j==1)) {
 +
    brd.create('point',[
 +
      function(x,y){ return function(){ return x*b1.X()+y*b2.X(); };}(i,j),
 +
      function(x,y){ return function(){ return x*b1.Y()+y*b2.Y(); };}(i,j)
 +
      ], {name:'', size:2});
 +
}}
  
 
w1 = brd.create('arrow', [[0,0], function() {
 
w1 = brd.create('arrow', [[0,0], function() {
 
     var num = b1.X() * b2.Y() - b2.X() * b1.Y();
 
     var num = b1.X() * b2.Y() - b2.X() * b1.Y();
 
     return [b2.Y() / num,  -b2.X() / num];
 
     return [b2.Y() / num,  -b2.X() / num];
}], {strokeColor: 'red'});
+
}], {strokeColor: 'black', name:"1'", withLabel:true, label:{position:'rt'}});
  
 
w2 = brd.create('arrow', [[0,0], function() {
 
w2 = brd.create('arrow', [[0,0], function() {
 
     var num = b1.X() * b2.Y() - b2.X() * b1.Y();
 
     var num = b1.X() * b2.Y() - b2.X() * b1.Y();
 
     return [-b1.Y() / num,  b1.X() / num];
 
     return [-b1.Y() / num,  b1.X() / num];
}], {strokeColor: 'black'});
+
}], {strokeColor: 'red', name:"2'", withLabel:true, label:{position:'rt'}});
  
  

Latest revision as of 12:10, 20 June 2016