# Difference between revisions of "Line"

From JSXGraph Wiki

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<source lang="javascript"> | <source lang="javascript"> | ||

var b = JXG.JSXGraph.initBoard('jxgbox', {originX: 200, originY: 100, unitX: 50, unitY: 50}); | var b = JXG.JSXGraph.initBoard('jxgbox', {originX: 200, originY: 100, unitX: 50, unitY: 50}); | ||

− | var p1 = | + | var p1 = b.createElement('point',[-1,1], {name:'A',style:6}); |

− | var p2 = | + | var p2 = b.createElement('point',[2,-1], {name:'B',style:6}); |

</source> | </source> | ||

Then we construct a line through "A" and "B". The setting of a new color and changing the stroke-width is not necessary. | Then we construct a line through "A" and "B". The setting of a new color and changing the stroke-width is not necessary. | ||

<source lang="javascript"> | <source lang="javascript"> | ||

− | var li = | + | var li = b.createElement('line',["A","B"], {strokeColor:'#00ff00',strokeWidth:2}); |

</source> | </source> | ||

Line 28: | Line 28: | ||

<source lang="javascript"> | <source lang="javascript"> | ||

− | var li2 = | + | var li2 = b.createElement('line',[p1,p2], |

{straightFirst:false, straightLast:false, strokeWidth:2, dash:2}); | {straightFirst:false, straightLast:false, strokeWidth:2, dash:2}); | ||

</source> | </source> |

## Revision as of 11:57, 21 October 2008

## Construction of a line

A line needs two points. Lets construct two points "A" and "B".

```
var b = JXG.JSXGraph.initBoard('jxgbox', {originX: 200, originY: 100, unitX: 50, unitY: 50});
var p1 = b.createElement('point',[-1,1], {name:'A',style:6});
var p2 = b.createElement('point',[2,-1], {name:'B',style:6});
```

Then we construct a line through "A" and "B". The setting of a new color and changing the stroke-width is not necessary.

```
var li = b.createElement('line',["A","B"], {strokeColor:'#00ff00',strokeWidth:2});
```

Generally it is better to use JavaScript variables and not Geometry-Element names when constructing. Now, we do the same examples with JavaScript variables. Further, we don't show the whole line, but only a segment. To show another variation, we use a dashed line style.

```
var li2 = b.createElement('line',[p1,p2],
{straightFirst:false, straightLast:false, strokeWidth:2, dash:2});
```