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

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(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...")
 
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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
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the y-coordinate of `B` is set to 1. Therefore, `A` moves
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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:false,boundingbox:[-2,2,2,-2],keepaspectratio:true});
+
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]);
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</jsxgraph>
 
</jsxgraph>
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===The JavaScript code===
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<source lang="javascript">
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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(){
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        A.moveTo([1, A.Y()]);
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        B.moveTo([B.X(), 1]);
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});
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</source>
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[[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]);
});