Mutually dependent line and gliders

From JSXGraph Wiki
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.

In this example, a and b are gliders on lines. Additionally, the glider a depends on glider b.

The JavaScript code

var board = JXG.JSXGraph.initBoard('jxgbox', {
    boundingbox: [-5,5,5,-5],
    keepaspectratio: true, axis:false, grid:true
board.create('axis',[[0,0],[1,0]], {ticks: {majorHeight:20}});
board.create('axis',[[0,0],[0,1]], {ticks: {majorHeight:20}});

var el0 = board.create('line',[[0,0], [0,1]], {strokeOpacity: .2, strokeColor: '#000000', fixed: true, name: 'x=0'});
var el1 = board.create('line',[[1,0], [1,1]], {strokeOpacity: .2, strokeColor: '#000000', fixed: true, name: 'x=1'});

var gl1 = board.create('glider', [0,0, el0], {name:'b'});
var gl2 = board.create('glider', [1,0, el1], {name:'a'});
//gl1.draggable = function() {return true; };
//gl2.draggable = function() {return true; };

var line = board.create('line', [gl1, gl2]);

var offset = gl2.Y() - gl1.Y();

gl1.on('drag', function() {
    gl2.moveTo([gl1.X(), gl1.Y() + offset]);
gl2.on('drag', function() {
    offset = gl2.Y() - gl1.Y();