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

From JSXGraph Wiki

A WASSERMANN (talk | contribs) (Created page with "<jsxgraph width="600" height="600"> var brd = JXG.JSXGraph.initBoard('jxgbox',{axis:false,boundingbox:[-2,2,2,-2],keepaspectratio:true}); var A = brd.create('point', [1,0]); var...") |
A WASSERMANN (talk | contribs) |
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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 `A` is set to 1 and | ||

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

+ | on a vertical line, `B` moves on a horizontal line. | ||

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

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

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

Line 11: | Line 15: | ||

</jsxgraph> | </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]] |

## Revision as of 15:08, 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 a vertical line, `B` moves on a horizontal line.

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