Ellipsis: Difference between revisions

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Line 6: Line 6:
var board = JXG.JSXGraph.initBoard('jxgbox', { boundingbox: [-5, 5, 5, -5], axis: true, showClearTraces: true});
var board = JXG.JSXGraph.initBoard('jxgbox', { boundingbox: [-5, 5, 5, -5], axis: true, showClearTraces: true});


var f1 = board.create('glider', [-2, 0, board.defaultAxes.x], {name:"f"});
var f1 = board.create('glider', [-2, 0, board.defaultAxes.x], {name:"f'"});
var f2 = board.create('glider', [2,  0, board.defaultAxes.x], {name:"f'"});
var f2 = board.create('glider', [2,  0, board.defaultAxes.x], {name:"f"});
var ell = board.create('ellipse', [f1, f2, [0,3]]);
var ell = board.create('ellipse', [f1, f2, [0,3]]);


var P = board.create('glider', [-1, 2, ell], {name: 'P'});  
var P = board.create('glider', [-1, 2, ell], {name: 'p'});  
var s1 = board.create('segment', [f1,P]);
var s1 = board.create('segment', [f1,P]);
var s2 = board.create('segment', [f2,P]);
var s2 = board.create('segment', [f2,P]);


var txt = board.create('text', [3, 3, () => P.Dist(f1).toFixed(2) + ' + ' +  P.Dist(f2).toFixed(2) + ' = ' + (P.Dist(f1) + P.Dist(f2)).toFixed(2)]);
var txt = board.create('text', [0.2, 4, () => "|pf| + |pf'| = " + P.Dist(f1).toFixed(2) + ' + ' +  P.Dist(f2).toFixed(2) + ' = ' + (P.Dist(f1) + P.Dist(f2)).toFixed(2)]);


</jsxgraph>
</jsxgraph>
Line 20: Line 20:
=== The underlying JavaScript code ===
=== The underlying JavaScript code ===
<source lang="javascript">
<source lang="javascript">
JXG.Options.label.autoPosition = true;
JXG.Options.text.fontSize = 16;
JXG.Options.line.strokeWidth = 0.8;
var board = JXG.JSXGraph.initBoard('jxgbox', { boundingbox: [-5, 5, 5, -5], axis: true, showClearTraces: true});
var f1 = board.create('glider', [-2, 0, board.defaultAxes.x], {name:"f'"});
var f2 = board.create('glider', [2,  0, board.defaultAxes.x], {name:"f"});
var ell = board.create('ellipse', [f1, f2, [0,3]]);
var P = board.create('glider', [-1, 2, ell], {name: 'p'});
var s1 = board.create('segment', [f1,P]);
var s2 = board.create('segment', [f2,P]);
var txt = board.create('text', [0.2, 4, () => "|pf| + |pf'| = " + P.Dist(f1).toFixed(2) + ' + ' +  P.Dist(f2).toFixed(2) + ' = ' + (P.Dist(f1) + P.Dist(f2)).toFixed(2)]);
</source>
</source>
[[Category:Examples]]
[[Category:Examples]]
[[Category:Geometry]]
[[Category:Geometry]]

Latest revision as of 09:23, 29 June 2021

The underlying JavaScript code

JXG.Options.label.autoPosition = true;
JXG.Options.text.fontSize = 16;
JXG.Options.line.strokeWidth = 0.8;

var board = JXG.JSXGraph.initBoard('jxgbox', { boundingbox: [-5, 5, 5, -5], axis: true, showClearTraces: true});

var f1 = board.create('glider', [-2, 0, board.defaultAxes.x], {name:"f'"});
var f2 = board.create('glider', [2,  0, board.defaultAxes.x], {name:"f"});
var ell = board.create('ellipse', [f1, f2, [0,3]]);

var P = board.create('glider', [-1, 2, ell], {name: 'p'}); 
var s1 = board.create('segment', [f1,P]);
var s2 = board.create('segment', [f2,P]);

var txt = board.create('text', [0.2, 4, () => "|pf| + |pf'| = " + P.Dist(f1).toFixed(2) + ' + ' +  P.Dist(f2).toFixed(2) + ' = ' + (P.Dist(f1) + P.Dist(f2)).toFixed(2)]);