Difference between revisions of "Point 'fixed' in one direction"
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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 12:09, 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]);
});
