Point 'fixed' in one direction: Difference between revisions

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


brd.on('update', function(){
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>
===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('move', function(){
        A.moveTo([1, A.Y()]);
        B.moveTo([B.X(), 1]);
});
</source>
[[Category:Examples]]

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]);
});