View source for Point 'fixed' in one direction

''A'' and ''B'' are free points. Whenever the board is updated, e.g.
after a drag event, the x-coordinate of ''A'' is set to 1 and
the y-coordinate of ''B'' is set to 1. Therefore, ''A'' moves 
on the vertical line through x=1, ''B'' moves on the horizontal line through y=1.
<jsxgraph width="600" height="600">
var brd = JXG.JSXGraph.initBoard('jxgbox',{axis:true,boundingbox:[-1,2,2,-1]});

var A = brd.create('point', [1,0]);
var B = brd.create('point', [0,1]);

brd.on('update', function(){
        A.moveTo([1, A.Y()]);
        B.moveTo([B.X(), 1]);
});

</jsxgraph>

===The JavaScript code===
<source lang="javascript">
var brd = JXG.JSXGraph.initBoard('jxgbox',{axis:true,boundingbox:[-1,2,2,-1]});

var A = brd.create('point', [1,0]);
var B = brd.create('point', [0,1]);

brd.on('update', function(){
        A.moveTo([1, A.Y()]);
        B.moveTo([B.X(), 1]);
});
</source>
[[Category:Examples]]