# Point 'fixed' in one direction: Difference between revisions

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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]}); | ||

Line 9: | Line 9: | ||

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

brd.on(' | brd.on('move', function(){ | ||

A.moveTo([1, A.Y()]); | A.moveTo([1, A.Y()]); | ||

B.moveTo([B.X(), 1]); | B.moveTo([B.X(), 1]); | ||

}); | }); | ||

</jsxgraph> | </jsxgraph> | ||

Line 23: | Line 22: | ||

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

brd.on(' | brd.on('move', function(){ | ||

A.moveTo([1, A.Y()]); | A.moveTo([1, A.Y()]); | ||

B.moveTo([B.X(), 1]); | B.moveTo([B.X(), 1]); |

## Latest revision as of 10:09, 21 February 2013

*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('move', function(){
A.moveTo([1, A.Y()]);
B.moveTo([B.X(), 1]);
});
```