Dual lattice: Difference between revisions
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<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: | brd = JXG.JSXGraph.initBoard('box1', {boundingbox: [-5, 5, 5, -5], axis:false}); | ||
var b1 = brd.create('point', [4,0], {size:6, name:'', color:'blue'}) | var b1 = brd.create('point', [4,0], {size:6, name:'1', 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'}), | |||
v2 = brd.create('arrow', [[0,0], b2], {strokeColor: 'red'}), | |||
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() { | |||
var num = b1.X() * b2.Y() - b2.X() * b1.Y(); | |||
return [b2.Y() / num, -b2.X() / num]; | |||
}], {strokeColor: 'black', name:"1'", withLabel:true, label:{position:'rt'}}); | |||
w2 = brd.create('arrow', [[0,0], function() { | |||
var num = b1.X() * b2.Y() - b2.X() * b1.Y(); | |||
return [-b1.Y() / num, b1.X() / num]; | |||
}], {strokeColor: 'red', name:"2'", withLabel:true, label:{position:'rt'}}); | |||
</jsxgraph> | </jsxgraph> | ||
[[Category:Examples]] | [[Category:Examples]] | ||
