# Difference between revisions of "Point 'fixed' in one direction"

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− | + | ''A'' and ''B'' are free points. Whenever the board is updated, e.g. | |

− | after a drag event, the x-coordinate of | + | after a drag event, the x-coordinate of ''A'' is set to 1 and |

− | the y-coordinate of | + | the y-coordinate of ''B'' is set to 1. Therefore, ''A'' moves |

− | on | + | on the vertical line through x=1, ''B'' moves on the horizontal line through y=1. |

<jsxgraph width="600" height="600"> | <jsxgraph width="600" height="600"> | ||

var brd = JXG.JSXGraph.initBoard('jxgbox',{axis:true,boundingbox:[-1,2,2,-1]}); | var brd = JXG.JSXGraph.initBoard('jxgbox',{axis:true,boundingbox:[-1,2,2,-1]}); |

## Revision as of 15:09, 8 October 2012

*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.

### The JavaScript code

```
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]);
});
```